fc2a21d4-1bc5-45fd-9cd3-b8dcbd6c5fde

Committed 31 Jan 2025 02:11PM UTC coverage: 71.594% (+0.007%) from 71.587%

Build # fc2a21d4-1bc5-45fd-9cd3-b8dcbd6c5fde

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push

prow

Committed by

web-flow

Commit Message

Merge pull request #13825 from ksimon1/requirements-tests

feat: move preference requirements unit tests to correct packages

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65.05

/pkg/virt-handler/vm.go

/*
 * This file is part of the KubeVirt project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright 2017 Red Hat, Inc.
 *
 */

package virthandler

import (
        "bytes"
        "context"
        "encoding/json"
        goerror "errors"
        "fmt"
        "io"
        "net"
        "os"
        "path/filepath"
        "regexp"
        "runtime"
        "sort"
        "strconv"
        "strings"
        "time"

        "github.com/mitchellh/go-ps"
        "github.com/opencontainers/runc/libcontainer/cgroups"
        "golang.org/x/sys/unix"
        "libvirt.org/go/libvirtxml"

        k8sv1 "k8s.io/api/core/v1"
        "k8s.io/apimachinery/pkg/api/equality"
        "k8s.io/apimachinery/pkg/api/resource"
        metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
        "k8s.io/apimachinery/pkg/types"
        "k8s.io/apimachinery/pkg/util/errors"
        "k8s.io/apimachinery/pkg/util/wait"
        "k8s.io/client-go/tools/cache"
        "k8s.io/client-go/tools/record"
        "k8s.io/client-go/util/workqueue"

        v1 "kubevirt.io/api/core/v1"
        "kubevirt.io/client-go/kubecli"
        "kubevirt.io/client-go/log"

        "kubevirt.io/kubevirt/pkg/config"
        containerdisk "kubevirt.io/kubevirt/pkg/container-disk"
        "kubevirt.io/kubevirt/pkg/controller"
        diskutils "kubevirt.io/kubevirt/pkg/ephemeral-disk-utils"
        "kubevirt.io/kubevirt/pkg/executor"
        cmdv1 "kubevirt.io/kubevirt/pkg/handler-launcher-com/cmd/v1"
        hostdisk "kubevirt.io/kubevirt/pkg/host-disk"
        hotplugdisk "kubevirt.io/kubevirt/pkg/hotplug-disk"
        netcache "kubevirt.io/kubevirt/pkg/network/cache"
        "kubevirt.io/kubevirt/pkg/network/domainspec"
        neterrors "kubevirt.io/kubevirt/pkg/network/errors"
        netsetup "kubevirt.io/kubevirt/pkg/network/setup"
        netvmispec "kubevirt.io/kubevirt/pkg/network/vmispec"
        "kubevirt.io/kubevirt/pkg/pointer"
        "kubevirt.io/kubevirt/pkg/safepath"
        "kubevirt.io/kubevirt/pkg/storage/reservation"
        pvctypes "kubevirt.io/kubevirt/pkg/storage/types"
        storagetypes "kubevirt.io/kubevirt/pkg/storage/types"
        "kubevirt.io/kubevirt/pkg/util"
        virtutil "kubevirt.io/kubevirt/pkg/util"
        "kubevirt.io/kubevirt/pkg/util/hardware"
        "kubevirt.io/kubevirt/pkg/util/migrations"
        virtconfig "kubevirt.io/kubevirt/pkg/virt-config"
        "kubevirt.io/kubevirt/pkg/virt-controller/services"
        "kubevirt.io/kubevirt/pkg/virt-controller/watch/topology"
        virtcache "kubevirt.io/kubevirt/pkg/virt-handler/cache"
        "kubevirt.io/kubevirt/pkg/virt-handler/cgroup"
        cmdclient "kubevirt.io/kubevirt/pkg/virt-handler/cmd-client"
        container_disk "kubevirt.io/kubevirt/pkg/virt-handler/container-disk"
        device_manager "kubevirt.io/kubevirt/pkg/virt-handler/device-manager"
        "kubevirt.io/kubevirt/pkg/virt-handler/heartbeat"
        hotplug_volume "kubevirt.io/kubevirt/pkg/virt-handler/hotplug-disk"
        "kubevirt.io/kubevirt/pkg/virt-handler/isolation"
        migrationproxy "kubevirt.io/kubevirt/pkg/virt-handler/migration-proxy"
        "kubevirt.io/kubevirt/pkg/virt-handler/selinux"
        "kubevirt.io/kubevirt/pkg/virt-launcher/virtwrap/api"
        "kubevirt.io/kubevirt/pkg/virtiofs"
)

type netconf interface {
        Setup(vmi *v1.VirtualMachineInstance, networks []v1.Network, launcherPid int, preSetup func() error) error
        Teardown(vmi *v1.VirtualMachineInstance) error
}

type netstat interface {
        UpdateStatus(vmi *v1.VirtualMachineInstance, domain *api.Domain) error
        Teardown(vmi *v1.VirtualMachineInstance)
        PodInterfaceVolatileDataIsCached(vmi *v1.VirtualMachineInstance, ifaceName string) bool
        CachePodInterfaceVolatileData(vmi *v1.VirtualMachineInstance, ifaceName string, data *netcache.PodIfaceCacheData)
}

type downwardMetricsManager interface {
        Run(stopCh chan struct{})
        StartServer(vmi *v1.VirtualMachineInstance, pid int) error
        StopServer(vmi *v1.VirtualMachineInstance)
}

const (
        failedDetectIsolationFmt              = "failed to detect isolation for launcher pod: %v"
        unableCreateVirtLauncherConnectionFmt = "unable to create virt-launcher client connection: %v"
        // This value was determined after consulting with libvirt developers and performing extensive testing.
        parallelMultifdMigrationThreads = uint(8)
)

const (
        //VolumeReadyReason is the reason set when the volume is ready.
        VolumeReadyReason = "VolumeReady"
        //VolumeUnMountedFromPodReason is the reason set when the volume is unmounted from the virtlauncher pod
        VolumeUnMountedFromPodReason = "VolumeUnMountedFromPod"
        //VolumeMountedToPodReason is the reason set when the volume is mounted to the virtlauncher pod
        VolumeMountedToPodReason = "VolumeMountedToPod"
        //VolumeUnplugged is the reason set when the volume is completely unplugged from the VMI
        VolumeUnplugged = "VolumeUnplugged"
        //VMIDefined is the reason set when a VMI is defined
        VMIDefined = "VirtualMachineInstance defined."
        //VMIStarted is the reason set when a VMI is started
        VMIStarted = "VirtualMachineInstance started."
        //VMIShutdown is the reason set when a VMI is shutdown
        VMIShutdown = "The VirtualMachineInstance was shut down."
        //VMICrashed is the reason set when a VMI crashed
        VMICrashed = "The VirtualMachineInstance crashed."
        //VMIAbortingMigration is the reason set when migration is being aborted
        VMIAbortingMigration = "VirtualMachineInstance is aborting migration."
        //VMIMigrating in the reason set when the VMI is migrating
        VMIMigrating = "VirtualMachineInstance is migrating."
        //VMIMigrationTargetPrepared is the reason set when the migration target has been prepared
        VMIMigrationTargetPrepared = "VirtualMachineInstance Migration Target Prepared."
        //VMIStopping is the reason set when the VMI is stopping
        VMIStopping = "VirtualMachineInstance stopping"
        //VMIGracefulShutdown is the reason set when the VMI is gracefully shut down
        VMIGracefulShutdown = "Signaled Graceful Shutdown"
        //VMISignalDeletion is the reason set when the VMI has signal deletion
        VMISignalDeletion = "Signaled Deletion"

        // MemoryHotplugFailedReason is the reason set when the VM cannot hotplug memory
        memoryHotplugFailedReason = "Memory Hotplug Failed"
)

var getCgroupManager = func(vmi *v1.VirtualMachineInstance) (cgroup.Manager, error) {
        return cgroup.NewManagerFromVM(vmi)
}

func NewController(
        recorder record.EventRecorder,
        clientset kubecli.KubevirtClient,
        host string,
        migrationIpAddress string,
        virtShareDir string,
        virtPrivateDir string,
        kubeletPodsDir string,
        vmiSourceInformer cache.SharedIndexInformer,
        vmiTargetInformer cache.SharedIndexInformer,
        domainInformer cache.SharedInformer,
        maxDevices int,
        clusterConfig *virtconfig.ClusterConfig,
        podIsolationDetector isolation.PodIsolationDetector,
        migrationProxy migrationproxy.ProxyManager,
        downwardMetricsManager downwardMetricsManager,
        capabilities *libvirtxml.Caps,
        hostCpuModel string,
        netConf netconf,
        netStat netstat,
        netBindingPluginMemoryCalculator netBindingPluginMemoryCalculator,
) (*VirtualMachineController, error) {

        queue := workqueue.NewTypedRateLimitingQueueWithConfig[string](
                workqueue.DefaultTypedControllerRateLimiter[string](),
                workqueue.TypedRateLimitingQueueConfig[string]{Name: "virt-handler-vm"},
        )

        containerDiskState := filepath.Join(virtPrivateDir, "container-disk-mount-state")
        if err := os.MkdirAll(containerDiskState, 0700); err != nil {
                return nil, err
        }

        hotplugState := filepath.Join(virtPrivateDir, "hotplug-volume-mount-state")
        if err := os.MkdirAll(hotplugState, 0700); err != nil {
                return nil, err
        }

        c := &VirtualMachineController{
                queue:                            queue,
                recorder:                         recorder,
                clientset:                        clientset,
                host:                             host,
                migrationIpAddress:               migrationIpAddress,
                virtShareDir:                     virtShareDir,
                vmiSourceStore:                   vmiSourceInformer.GetStore(),
                vmiTargetStore:                   vmiTargetInformer.GetStore(),
                domainStore:                      domainInformer.GetStore(),
                heartBeatInterval:                1 * time.Minute,
                migrationProxy:                   migrationProxy,
                podIsolationDetector:             podIsolationDetector,
                containerDiskMounter:             container_disk.NewMounter(podIsolationDetector, containerDiskState, clusterConfig),
                hotplugVolumeMounter:             hotplug_volume.NewVolumeMounter(hotplugState, kubeletPodsDir),
                clusterConfig:                    clusterConfig,
                virtLauncherFSRunDirPattern:      "/proc/%d/root/var/run",
                capabilities:                     capabilities,
                hostCpuModel:                     hostCpuModel,
                vmiExpectations:                  controller.NewUIDTrackingControllerExpectations(controller.NewControllerExpectations()),
                sriovHotplugExecutorPool:         executor.NewRateLimitedExecutorPool(executor.NewExponentialLimitedBackoffCreator()),
                ioErrorRetryManager:              NewFailRetryManager("io-error-retry", 10*time.Second, 3*time.Minute, 30*time.Second),
                netConf:                          netConf,
                netStat:                          netStat,
                netBindingPluginMemoryCalculator: netBindingPluginMemoryCalculator,
        }

        c.hasSynced = func() bool {
                return domainInformer.HasSynced() && vmiSourceInformer.HasSynced() && vmiTargetInformer.HasSynced()
        }

        _, err := vmiSourceInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
                AddFunc:    c.addFunc,
                DeleteFunc: c.deleteFunc,
                UpdateFunc: c.updateFunc,
        })
        if err != nil {
                return nil, err
        }

        _, err = vmiTargetInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
                AddFunc:    c.addFunc,
                DeleteFunc: c.deleteFunc,
                UpdateFunc: c.updateFunc,
        })
        if err != nil {
                return nil, err
        }

        _, err = domainInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
                AddFunc:    c.addDomainFunc,
                DeleteFunc: c.deleteDomainFunc,
                UpdateFunc: c.updateDomainFunc,
        })
        if err != nil {
                return nil, err
        }

        c.launcherClients = virtcache.LauncherClientInfoByVMI{}

        c.downwardMetricsManager = downwardMetricsManager

        c.domainNotifyPipes = make(map[string]string)

        permissions := "rw"
        if cgroups.IsCgroup2UnifiedMode() {
                // Need 'rwm' permissions otherwise ebpf filtering program attached by runc
                // will deny probing the device file with 'access' syscall. That in turn
                // will lead to virtqemud failure on VM startup.
                // This has been fixed upstream:
                //   https://github.com/opencontainers/runc/pull/2796
                // but the workaround is still needed to support previous versions without
                // the patch.
                permissions = "rwm"
        }

        c.deviceManagerController = device_manager.NewDeviceController(
                c.host,
                maxDevices,
                permissions,
                device_manager.PermanentHostDevicePlugins(maxDevices, permissions),
                clusterConfig,
                clientset.CoreV1())
        c.heartBeat = heartbeat.NewHeartBeat(clientset.CoreV1(), c.deviceManagerController, clusterConfig, host)

        return c, nil
}

type netBindingPluginMemoryCalculator interface {
        Calculate(vmi *v1.VirtualMachineInstance, registeredPlugins map[string]v1.InterfaceBindingPlugin) resource.Quantity
}

type VirtualMachineController struct {
        recorder                 record.EventRecorder
        clientset                kubecli.KubevirtClient
        host                     string
        migrationIpAddress       string
        virtShareDir             string
        virtPrivateDir           string
        queue                    workqueue.TypedRateLimitingInterface[string]
        vmiSourceStore           cache.Store
        vmiTargetStore           cache.Store
        domainStore              cache.Store
        launcherClients          virtcache.LauncherClientInfoByVMI
        heartBeatInterval        time.Duration
        deviceManagerController  *device_manager.DeviceController
        migrationProxy           migrationproxy.ProxyManager
        podIsolationDetector     isolation.PodIsolationDetector
        containerDiskMounter     container_disk.Mounter
        hotplugVolumeMounter     hotplug_volume.VolumeMounter
        clusterConfig            *virtconfig.ClusterConfig
        sriovHotplugExecutorPool *executor.RateLimitedExecutorPool
        downwardMetricsManager   downwardMetricsManager

        netConf                          netconf
        netStat                          netstat
        netBindingPluginMemoryCalculator netBindingPluginMemoryCalculator

        domainNotifyPipes           map[string]string
        virtLauncherFSRunDirPattern string
        heartBeat                   *heartbeat.HeartBeat
        capabilities                *libvirtxml.Caps
        hostCpuModel                string
        vmiExpectations             *controller.UIDTrackingControllerExpectations
        ioErrorRetryManager         *FailRetryManager
        hasSynced                   func() bool
}

type virtLauncherCriticalSecurebootError struct {
        msg string
}

func (e *virtLauncherCriticalSecurebootError) Error() string { return e.msg }

type vmiIrrecoverableError struct {
        msg string
}

func (e *vmiIrrecoverableError) Error() string { return e.msg }

func formatIrrecoverableErrorMessage(domain *api.Domain) string {
        msg := "unknown reason"
        if domainPausedFailedPostCopy(domain) {
                msg = "VMI is irrecoverable due to failed post-copy migration"
        }
        return msg
}

func handleDomainNotifyPipe(domainPipeStopChan chan struct{}, ln net.Listener, virtShareDir string, vmi *v1.VirtualMachineInstance) {

        fdChan := make(chan net.Conn, 100)

        // Close listener and exit when stop encountered
        go func() {
                <-domainPipeStopChan
                log.Log.Object(vmi).Infof("closing notify pipe listener for vmi")
                if err := ln.Close(); err != nil {
                        log.Log.Object(vmi).Infof("failed closing notify pipe listener for vmi: %v", err)
                }
        }()

        // Listen for new connections,
        go func(vmi *v1.VirtualMachineInstance, ln net.Listener, domainPipeStopChan chan struct{}) {
                for {
                        fd, err := ln.Accept()
                        if err != nil {
                                if goerror.Is(err, net.ErrClosed) {
                                        // As Accept blocks, closing it is our mechanism to exit this loop
                                        return
                                }
                                log.Log.Reason(err).Error("Domain pipe accept error encountered.")
                                // keep listening until stop invoked
                                time.Sleep(1 * time.Second)
                        } else {
                                fdChan <- fd
                        }
                }
        }(vmi, ln, domainPipeStopChan)

        // Process new connections
        // exit when stop encountered
        go func(vmi *v1.VirtualMachineInstance, fdChan chan net.Conn, domainPipeStopChan chan struct{}) {
                for {
                        select {
                        case <-domainPipeStopChan:
                                return
                        case fd := <-fdChan:
                                go func(vmi *v1.VirtualMachineInstance) {
                                        defer fd.Close()

                                        // pipe the VMI domain-notify.sock to the virt-handler domain-notify.sock
                                        // so virt-handler receives notifications from the VMI
                                        conn, err := net.Dial("unix", filepath.Join(virtShareDir, "domain-notify.sock"))
                                        if err != nil {
                                                log.Log.Reason(err).Error("error connecting to domain-notify.sock for proxy connection")
                                                return
                                        }
                                        defer conn.Close()

                                        log.Log.Object(vmi).Infof("Accepted new notify pipe connection for vmi")
                                        copyErr := make(chan error, 2)
                                        go func() {
                                                _, err := io.Copy(fd, conn)
                                                copyErr <- err
                                        }()
                                        go func() {
                                                _, err := io.Copy(conn, fd)
                                                copyErr <- err
                                        }()

                                        // wait until one of the copy routines exit then
                                        // let the fd close
                                        err = <-copyErr
                                        if err != nil {
                                                log.Log.Object(vmi).Infof("closing notify pipe connection for vmi with error: %v", err)
                                        } else {
                                                log.Log.Object(vmi).Infof("gracefully closed notify pipe connection for vmi")
                                        }

                                }(vmi)
                        }
                }
        }(vmi, fdChan, domainPipeStopChan)
}

func (c *VirtualMachineController) startDomainNotifyPipe(domainPipeStopChan chan struct{}, vmi *v1.VirtualMachineInstance) error {

        res, err := c.podIsolationDetector.Detect(vmi)
        if err != nil {
                return fmt.Errorf("failed to detect isolation for launcher pod when setting up notify pipe: %v", err)
        }

        // inject the domain-notify.sock into the VMI pod.
        root, err := res.MountRoot()
        if err != nil {
                return err
        }
        socketDir, err := root.AppendAndResolveWithRelativeRoot(c.virtShareDir)
        if err != nil {
                return err
        }

        listener, err := safepath.ListenUnixNoFollow(socketDir, "domain-notify-pipe.sock")
        if err != nil {
                log.Log.Reason(err).Error("failed to create unix socket for proxy service")
                return err
        }
        socketPath, err := safepath.JoinNoFollow(socketDir, "domain-notify-pipe.sock")
        if err != nil {
                return err
        }

        if util.IsNonRootVMI(vmi) {
                err := diskutils.DefaultOwnershipManager.SetFileOwnership(socketPath)
                if err != nil {
                        log.Log.Reason(err).Error("unable to change ownership for domain notify")
                        return err
                }
        }

        handleDomainNotifyPipe(domainPipeStopChan, listener, c.virtShareDir, vmi)

        return nil
}

// Determines if a domain's grace period has expired during shutdown.
// If the grace period has started but not expired, timeLeft represents
// the time in seconds left until the period expires.
// If the grace period has not started, timeLeft will be set to -1.
func (c *VirtualMachineController) hasGracePeriodExpired(dom *api.Domain) (hasExpired bool, timeLeft int64) {

        hasExpired = false
        timeLeft = 0

        if dom == nil {
                hasExpired = true
                return
        }

        startTime := int64(0)
        if dom.Spec.Metadata.KubeVirt.GracePeriod.DeletionTimestamp != nil {
                startTime = dom.Spec.Metadata.KubeVirt.GracePeriod.DeletionTimestamp.UTC().Unix()
        }
        gracePeriod := dom.Spec.Metadata.KubeVirt.GracePeriod.DeletionGracePeriodSeconds

        // If gracePeriod == 0, then there will be no startTime set, deletion
        // should occur immediately during shutdown.
        if gracePeriod == 0 {
                hasExpired = true
                return
        } else if startTime == 0 {
                // If gracePeriod > 0, then the shutdown signal needs to be sent
                // and the gracePeriod start time needs to be set.
                timeLeft = -1
                return
        }

        now := time.Now().UTC().Unix()
        diff := now - startTime

        if diff >= gracePeriod {
                hasExpired = true
                return
        }

        timeLeft = int64(gracePeriod - diff)
        if timeLeft < 1 {
                timeLeft = 1
        }
        return
}

func (c *VirtualMachineController) hasTargetDetectedReadyDomain(vmi *v1.VirtualMachineInstance) (bool, int64) {
        // give the target node 60 seconds to discover the libvirt domain via the domain informer
        // before allowing the VMI to be processed. This closes the gap between the
        // VMI's status getting updated to reflect the new source node, and the domain
        // informer firing the event to alert the source node of the new domain.
        migrationTargetDelayTimeout := 60

        if vmi.Status.MigrationState != nil &&
                vmi.Status.MigrationState.TargetNodeDomainDetected &&
                vmi.Status.MigrationState.TargetNodeDomainReadyTimestamp != nil {

                return true, 0
        }

        nowUnix := time.Now().UTC().Unix()
        migrationEndUnix := vmi.Status.MigrationState.EndTimestamp.Time.UTC().Unix()

        diff := nowUnix - migrationEndUnix

        if diff > int64(migrationTargetDelayTimeout) {
                return false, 0
        }

        timeLeft := int64(migrationTargetDelayTimeout) - diff

        enqueueTime := timeLeft
        if enqueueTime < 5 {
                enqueueTime = 5
        }

        // re-enqueue the key to ensure it gets processed again within the right time.
        c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Duration(enqueueTime)*time.Second)

        return false, timeLeft
}

// teardownNetwork performs network cache cleanup for a specific VMI.
func (c *VirtualMachineController) teardownNetwork(vmi *v1.VirtualMachineInstance) {
        if string(vmi.UID) == "" {
                return
        }
        if err := c.netConf.Teardown(vmi); err != nil {
                log.Log.Reason(err).Errorf("failed to delete VMI Network cache files: %s", err.Error())
        }
        c.netStat.Teardown(vmi)
}

func (c *VirtualMachineController) setupNetwork(vmi *v1.VirtualMachineInstance, networks []v1.Network) error {
        if len(networks) == 0 {
                return nil
        }

        isolationRes, err := c.podIsolationDetector.Detect(vmi)
        if err != nil {
                return fmt.Errorf(failedDetectIsolationFmt, err)
        }
        rootMount, err := isolationRes.MountRoot()
        if err != nil {
                return err
        }

        return c.netConf.Setup(vmi, networks, isolationRes.Pid(), func() error {
                if virtutil.WantVirtioNetDevice(vmi) {
                        if err := c.claimDeviceOwnership(rootMount, "vhost-net"); err != nil {
                                return neterrors.CreateCriticalNetworkError(fmt.Errorf("failed to set up vhost-net device, %s", err))
                        }
                }
                if virtutil.NeedTunDevice(vmi) {
                        if err := c.claimDeviceOwnership(rootMount, "/net/tun"); err != nil {
                                return neterrors.CreateCriticalNetworkError(fmt.Errorf("failed to set up tun device, %s", err))
                        }
                }
                return nil
        })
}

func domainPausedFailedPostCopy(domain *api.Domain) bool {
        return domain != nil && domain.Status.Status == api.Paused && domain.Status.Reason == api.ReasonPausedPostcopyFailed
}

func domainMigrated(domain *api.Domain) bool {
        return domain != nil && domain.Status.Status == api.Shutoff && domain.Status.Reason == api.ReasonMigrated
}

func canUpdateToMounted(currentPhase v1.VolumePhase) bool {
        return currentPhase == v1.VolumeBound || currentPhase == v1.VolumePending || currentPhase == v1.HotplugVolumeAttachedToNode
}

func canUpdateToUnmounted(currentPhase v1.VolumePhase) bool {
        return currentPhase == v1.VolumeReady || currentPhase == v1.HotplugVolumeMounted || currentPhase == v1.HotplugVolumeAttachedToNode
}

func (c *VirtualMachineController) setMigrationProgressStatus(vmi *v1.VirtualMachineInstance, domain *api.Domain) {
        if domain == nil ||
                domain.Spec.Metadata.KubeVirt.Migration == nil ||
                vmi.Status.MigrationState == nil ||
                !c.isMigrationSource(vmi) {
                return
        }

        migrationMetadata := domain.Spec.Metadata.KubeVirt.Migration
        if migrationMetadata.UID != vmi.Status.MigrationState.MigrationUID {
                return
        }

        if vmi.Status.MigrationState.EndTimestamp == nil && migrationMetadata.EndTimestamp != nil {
                if migrationMetadata.Failed {
                        vmi.Status.MigrationState.FailureReason = migrationMetadata.FailureReason
                        c.recorder.Event(vmi, k8sv1.EventTypeWarning, v1.Migrated.String(), fmt.Sprintf("VirtualMachineInstance migration uid %s failed. reason:%s", string(migrationMetadata.UID), migrationMetadata.FailureReason))
                }
        }

        if vmi.Status.MigrationState.StartTimestamp == nil {
                vmi.Status.MigrationState.StartTimestamp = migrationMetadata.StartTimestamp
        }
        if vmi.Status.MigrationState.EndTimestamp == nil {
                vmi.Status.MigrationState.EndTimestamp = migrationMetadata.EndTimestamp
        }
        vmi.Status.MigrationState.AbortStatus = v1.MigrationAbortStatus(migrationMetadata.AbortStatus)
        vmi.Status.MigrationState.Completed = migrationMetadata.Completed
        vmi.Status.MigrationState.Failed = migrationMetadata.Failed
        vmi.Status.MigrationState.Mode = migrationMetadata.Mode
}

func (c *VirtualMachineController) migrationSourceUpdateVMIStatus(origVMI *v1.VirtualMachineInstance, domain *api.Domain) error {

        vmi := origVMI.DeepCopy()
        oldStatus := vmi.DeepCopy().Status

        // if a migration happens very quickly, it's possible parts of the in
        // progress status wasn't set. We need to make sure we set this even
        // if the migration has completed
        c.setMigrationProgressStatus(vmi, domain)

        // handle migrations differently than normal status updates.
        //
        // When a successful migration is detected, we must transfer ownership of the VMI
        // from the source node (this node) to the target node (node the domain was migrated to).
        //
        // Transfer ownership by...
        // 1. Marking vmi.Status.MigrationState as completed
        // 2. Update the vmi.Status.NodeName to reflect the target node's name
        // 3. Update the VMI's NodeNameLabel annotation to reflect the target node's name
        // 4. Clear the LauncherContainerImageVersion which virt-controller will detect
        //    and accurately based on the version used on the target pod
        //
        // After a migration, the VMI's phase is no longer owned by this node. Only the
        // MigrationState status field is eligible to be mutated.
        migrationHost := ""
        if vmi.Status.MigrationState != nil {
                migrationHost = vmi.Status.MigrationState.TargetNode
        }

        if vmi.Status.MigrationState != nil && vmi.Status.MigrationState.EndTimestamp == nil {
                now := metav1.NewTime(time.Now())
                vmi.Status.MigrationState.EndTimestamp = &now
        }

        targetNodeDetectedDomain, timeLeft := c.hasTargetDetectedReadyDomain(vmi)
        // If we can't detect where the migration went to, then we have no
        // way of transferring ownership. The only option here is to move the
        // vmi to failed.  The cluster vmi controller will then tear down the
        // resulting pods.
        if migrationHost == "" {
                // migrated to unknown host.
                vmi.Status.Phase = v1.Failed
                vmi.Status.MigrationState.Completed = true
                vmi.Status.MigrationState.Failed = true

                c.recorder.Event(vmi, k8sv1.EventTypeWarning, v1.Migrated.String(), fmt.Sprintf("The VirtualMachineInstance migrated to unknown host."))
        } else if !targetNodeDetectedDomain {
                if timeLeft <= 0 {
                        vmi.Status.Phase = v1.Failed
                        vmi.Status.MigrationState.Completed = true
                        vmi.Status.MigrationState.Failed = true

                        c.recorder.Event(vmi, k8sv1.EventTypeWarning, v1.Migrated.String(), fmt.Sprintf("The VirtualMachineInstance's domain was never observed on the target after the migration completed within the timeout period."))
                } else {
                        log.Log.Object(vmi).Info("Waiting on the target node to observe the migrated domain before performing the handoff")
                }
        } else if vmi.Status.MigrationState != nil {
                // this is the migration ACK.
                // At this point we know that the migration has completed and that
                // the target node has seen the domain event.
                vmi.Labels[v1.NodeNameLabel] = migrationHost
                delete(vmi.Labels, v1.OutdatedLauncherImageLabel)
                vmi.Status.LauncherContainerImageVersion = ""
                vmi.Status.NodeName = migrationHost
                // clean the evacuation node name since have already migrated to a new node
                vmi.Status.EvacuationNodeName = ""
                vmi.Status.MigrationState.Completed = true
                // update the vmi migrationTransport to indicate that next migration should use unix URI
                // new workloads will set the migrationTransport on their creation, however, legacy workloads
                // can make the switch only after the first migration
                vmi.Status.MigrationTransport = v1.MigrationTransportUnix
                c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.Migrated.String(), fmt.Sprintf("The VirtualMachineInstance migrated to node %s.", migrationHost))
                log.Log.Object(vmi).Infof("migration completed to node %s", migrationHost)
        }

        if !equality.Semantic.DeepEqual(oldStatus, vmi.Status) {
                key := controller.VirtualMachineInstanceKey(vmi)
                c.vmiExpectations.SetExpectations(key, 1, 0)
                _, err := c.clientset.VirtualMachineInstance(vmi.ObjectMeta.Namespace).Update(context.Background(), vmi, metav1.UpdateOptions{})
                if err != nil {
                        c.vmiExpectations.LowerExpectations(key, 1, 0)
                        return err
                }
        }
        return nil
}

func domainIsActiveOnTarget(domain *api.Domain) bool {

        if domain == nil {
                return false
        }

        // It's possible for the domain to be active on the target node if the domain is
        // 1. Running
        // 2. User initiated Paused
        if domain.Status.Status == api.Running {
                return true
        } else if domain.Status.Status == api.Paused && domain.Status.Reason == api.ReasonPausedUser {
                return true
        }
        return false

}

func (c *VirtualMachineController) migrationTargetUpdateVMIStatus(vmi *v1.VirtualMachineInstance, domain *api.Domain) error {

        vmiCopy := vmi.DeepCopy()

        if migrations.MigrationFailed(vmi) {
                // nothing left to report on the target node if the migration failed
                return nil
        }

        domainExists := domain != nil

        // Handle post migration
        if domainExists && vmi.Status.MigrationState != nil && !vmi.Status.MigrationState.TargetNodeDomainDetected {
                // record that we've see the domain populated on the target's node
                log.Log.Object(vmi).Info("The target node received the migrated domain")
                vmiCopy.Status.MigrationState.TargetNodeDomainDetected = true

                // adjust QEMU process memlock limits in order to enable old virt-launcher pod's to
                // perform hotplug host-devices on post migration.
                if err := isolation.AdjustQemuProcessMemoryLimits(c.podIsolationDetector, vmi, c.clusterConfig.GetConfig().AdditionalGuestMemoryOverheadRatio); err != nil {
                        c.recorder.Event(vmi, k8sv1.EventTypeWarning, err.Error(), "Failed to update target node qemu memory limits during live migration")
                }

        }

        if domainExists &&
                domainIsActiveOnTarget(domain) &&
                vmi.Status.MigrationState != nil &&
                vmi.Status.MigrationState.TargetNodeDomainReadyTimestamp == nil {

                // record the moment we detected the domain is running.
                // This is used as a trigger to help coordinate when CNI drivers
                // fail over the IP to the new pod.
                log.Log.Object(vmi).Info("The target node received the running migrated domain")
                now := metav1.Now()
                vmiCopy.Status.MigrationState.TargetNodeDomainReadyTimestamp = &now
                c.finalizeMigration(vmiCopy)
        }

        if !migrations.IsMigrating(vmi) {
                destSrcPortsMap := c.migrationProxy.GetTargetListenerPorts(string(vmi.UID))
                if len(destSrcPortsMap) == 0 {
                        msg := "target migration listener is not up for this vmi"
                        log.Log.Object(vmi).Error(msg)
                        return fmt.Errorf(msg)
                }

                hostAddress := ""
                // advertise the listener address to the source node
                if vmi.Status.MigrationState != nil {
                        hostAddress = vmi.Status.MigrationState.TargetNodeAddress
                }
                if hostAddress != c.migrationIpAddress {
                        portsList := make([]string, 0, len(destSrcPortsMap))

                        for k := range destSrcPortsMap {
                                portsList = append(portsList, k)
                        }
                        portsStrList := strings.Trim(strings.Join(strings.Fields(fmt.Sprint(portsList)), ","), "[]")
                        c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.PreparingTarget.String(), fmt.Sprintf("Migration Target is listening at %s, on ports: %s", c.migrationIpAddress, portsStrList))
                        vmiCopy.Status.MigrationState.TargetNodeAddress = c.migrationIpAddress
                        vmiCopy.Status.MigrationState.TargetDirectMigrationNodePorts = destSrcPortsMap
                }

                // If the migrated VMI requires dedicated CPUs, report the new pod CPU set to the source node
                // via the VMI migration status in order to patch the domain pre migration
                if vmi.IsCPUDedicated() {
                        err := c.reportDedicatedCPUSetForMigratingVMI(vmiCopy)
                        if err != nil {
                                return err
                        }
                        err = c.reportTargetTopologyForMigratingVMI(vmiCopy)
                        if err != nil {
                                return err
                        }
                }
        }

        // update the VMI if necessary
        if !equality.Semantic.DeepEqual(vmi.Status, vmiCopy.Status) {
                key := controller.VirtualMachineInstanceKey(vmi)
                c.vmiExpectations.SetExpectations(key, 1, 0)
                _, err := c.clientset.VirtualMachineInstance(vmi.ObjectMeta.Namespace).Update(context.Background(), vmiCopy, metav1.UpdateOptions{})
                if err != nil {
                        c.vmiExpectations.LowerExpectations(key, 1, 0)
                        return err
                }
        }

        return nil
}

func (c *VirtualMachineController) generateEventsForVolumeStatusChange(vmi *v1.VirtualMachineInstance, newStatusMap map[string]v1.VolumeStatus) {
        newStatusMapCopy := make(map[string]v1.VolumeStatus)
        for k, v := range newStatusMap {
                newStatusMapCopy[k] = v
        }
        for _, oldStatus := range vmi.Status.VolumeStatus {
                newStatus, ok := newStatusMap[oldStatus.Name]
                if !ok {
                        // status got removed
                        c.recorder.Event(vmi, k8sv1.EventTypeNormal, VolumeUnplugged, fmt.Sprintf("Volume %s has been unplugged", oldStatus.Name))
                        continue
                }
                if newStatus.Phase != oldStatus.Phase {
                        c.recorder.Event(vmi, k8sv1.EventTypeNormal, newStatus.Reason, newStatus.Message)
                }
                delete(newStatusMapCopy, newStatus.Name)
        }
        // Send events for any new statuses.
        for _, v := range newStatusMapCopy {
                c.recorder.Event(vmi, k8sv1.EventTypeNormal, v.Reason, v.Message)
        }
}

func (c *VirtualMachineController) updateHotplugVolumeStatus(vmi *v1.VirtualMachineInstance, volumeStatus v1.VolumeStatus, specVolumeMap map[string]v1.Volume) (v1.VolumeStatus, bool) {
        needsRefresh := false
        if volumeStatus.Target == "" {
                needsRefresh = true
                mounted, err := c.hotplugVolumeMounter.IsMounted(vmi, volumeStatus.Name, volumeStatus.HotplugVolume.AttachPodUID)
                if err != nil {
                        log.Log.Object(vmi).Errorf("error occurred while checking if volume is mounted: %v", err)
                }
                if mounted {
                        if _, ok := specVolumeMap[volumeStatus.Name]; ok && canUpdateToMounted(volumeStatus.Phase) {
                                log.DefaultLogger().Infof("Marking volume %s as mounted in pod, it can now be attached", volumeStatus.Name)
                                // mounted, and still in spec, and in phase we can change, update status to mounted.
                                volumeStatus.Phase = v1.HotplugVolumeMounted
                                volumeStatus.Message = fmt.Sprintf("Volume %s has been mounted in virt-launcher pod", volumeStatus.Name)
                                volumeStatus.Reason = VolumeMountedToPodReason
                        }
                } else {
                        // Not mounted, check if the volume is in the spec, if not update status
                        if _, ok := specVolumeMap[volumeStatus.Name]; !ok && canUpdateToUnmounted(volumeStatus.Phase) {
                                log.DefaultLogger().Infof("Marking volume %s as unmounted from pod, it can now be detached", volumeStatus.Name)
                                // Not mounted.
                                volumeStatus.Phase = v1.HotplugVolumeUnMounted
                                volumeStatus.Message = fmt.Sprintf("Volume %s has been unmounted from virt-launcher pod", volumeStatus.Name)
                                volumeStatus.Reason = VolumeUnMountedFromPodReason
                        }
                }
        } else {
                // Successfully attached to VM.
                volumeStatus.Phase = v1.VolumeReady
                volumeStatus.Message = fmt.Sprintf("Successfully attach hotplugged volume %s to VM", volumeStatus.Name)
                volumeStatus.Reason = VolumeReadyReason
        }
        return volumeStatus, needsRefresh
}

func needToComputeChecksums(vmi *v1.VirtualMachineInstance) bool {
        containerDisks := map[string]*v1.Volume{}
        for _, volume := range vmi.Spec.Volumes {
                if volume.VolumeSource.ContainerDisk != nil {
                        containerDisks[volume.Name] = &volume
                }
        }

        for i := range vmi.Status.VolumeStatus {
                _, isContainerDisk := containerDisks[vmi.Status.VolumeStatus[i].Name]
                if !isContainerDisk {
                        continue
                }

                if vmi.Status.VolumeStatus[i].ContainerDiskVolume == nil ||
                        vmi.Status.VolumeStatus[i].ContainerDiskVolume.Checksum == 0 {
                        return true
                }
        }

        if util.HasKernelBootContainerImage(vmi) {
                if vmi.Status.KernelBootStatus == nil {
                        return true
                }

                kernelBootContainer := vmi.Spec.Domain.Firmware.KernelBoot.Container

                if kernelBootContainer.KernelPath != "" &&
                        (vmi.Status.KernelBootStatus.KernelInfo == nil ||
                                vmi.Status.KernelBootStatus.KernelInfo.Checksum == 0) {
                        return true

                }

                if kernelBootContainer.InitrdPath != "" &&
                        (vmi.Status.KernelBootStatus.InitrdInfo == nil ||
                                vmi.Status.KernelBootStatus.InitrdInfo.Checksum == 0) {
                        return true

                }
        }

        return false
}

func (c *VirtualMachineController) updateChecksumInfo(vmi *v1.VirtualMachineInstance, syncError error) error {

        if syncError != nil || vmi.DeletionTimestamp != nil || !needToComputeChecksums(vmi) {
                return nil
        }

        diskChecksums, err := c.containerDiskMounter.ComputeChecksums(vmi)
        if goerror.Is(err, container_disk.ErrDiskContainerGone) {
                log.Log.Errorf("cannot compute checksums as containerdisk/kernelboot containers seem to have been terminated")
                return nil
        }
        if err != nil {
                return err
        }

        // containerdisks
        for i := range vmi.Status.VolumeStatus {
                checksum, exists := diskChecksums.ContainerDiskChecksums[vmi.Status.VolumeStatus[i].Name]
                if !exists {
                        // not a containerdisk
                        continue
                }

                vmi.Status.VolumeStatus[i].ContainerDiskVolume = &v1.ContainerDiskInfo{
                        Checksum: checksum,
                }
        }

        // kernelboot
        if util.HasKernelBootContainerImage(vmi) {
                vmi.Status.KernelBootStatus = &v1.KernelBootStatus{}

                if diskChecksums.KernelBootChecksum.Kernel != nil {
                        vmi.Status.KernelBootStatus.KernelInfo = &v1.KernelInfo{
                                Checksum: *diskChecksums.KernelBootChecksum.Kernel,
                        }
                }

                if diskChecksums.KernelBootChecksum.Initrd != nil {
                        vmi.Status.KernelBootStatus.InitrdInfo = &v1.InitrdInfo{
                                Checksum: *diskChecksums.KernelBootChecksum.Initrd,
                        }
                }
        }

        return nil
}

func (c *VirtualMachineController) updateVolumeStatusesFromDomain(vmi *v1.VirtualMachineInstance, domain *api.Domain) bool {
        // used by unit test
        hasHotplug := false

        if domain == nil {
                return hasHotplug
        }

        if len(vmi.Status.VolumeStatus) > 0 {
                diskDeviceMap := make(map[string]string)
                for _, disk := range domain.Spec.Devices.Disks {
                        diskDeviceMap[disk.Alias.GetName()] = disk.Target.Device
                }
                specVolumeMap := make(map[string]v1.Volume)
                for _, volume := range vmi.Spec.Volumes {
                        specVolumeMap[volume.Name] = volume
                }
                newStatusMap := make(map[string]v1.VolumeStatus)
                newStatuses := make([]v1.VolumeStatus, 0)
                needsRefresh := false
                for _, volumeStatus := range vmi.Status.VolumeStatus {
                        tmpNeedsRefresh := false
                        if _, ok := diskDeviceMap[volumeStatus.Name]; ok {
                                volumeStatus.Target = diskDeviceMap[volumeStatus.Name]
                        }
                        if volumeStatus.HotplugVolume != nil {
                                hasHotplug = true
                                volumeStatus, tmpNeedsRefresh = c.updateHotplugVolumeStatus(vmi, volumeStatus, specVolumeMap)
                                needsRefresh = needsRefresh || tmpNeedsRefresh
                        }
                        if volumeStatus.MemoryDumpVolume != nil {
                                volumeStatus, tmpNeedsRefresh = c.updateMemoryDumpInfo(vmi, volumeStatus, domain)
                                needsRefresh = needsRefresh || tmpNeedsRefresh
                        }
                        newStatuses = append(newStatuses, volumeStatus)
                        newStatusMap[volumeStatus.Name] = volumeStatus
                }
                sort.SliceStable(newStatuses, func(i, j int) bool {
                        return strings.Compare(newStatuses[i].Name, newStatuses[j].Name) == -1
                })
                if needsRefresh {
                        c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Second)
                }
                c.generateEventsForVolumeStatusChange(vmi, newStatusMap)
                vmi.Status.VolumeStatus = newStatuses
        }
        return hasHotplug
}

func (c *VirtualMachineController) updateGuestInfoFromDomain(vmi *v1.VirtualMachineInstance, domain *api.Domain) {

        if domain == nil {
                return
        }

        if vmi.Status.GuestOSInfo.Name != domain.Status.OSInfo.Name {
                vmi.Status.GuestOSInfo.Name = domain.Status.OSInfo.Name
                vmi.Status.GuestOSInfo.Version = domain.Status.OSInfo.Version
                vmi.Status.GuestOSInfo.KernelRelease = domain.Status.OSInfo.KernelRelease
                vmi.Status.GuestOSInfo.PrettyName = domain.Status.OSInfo.PrettyName
                vmi.Status.GuestOSInfo.VersionID = domain.Status.OSInfo.VersionId
                vmi.Status.GuestOSInfo.KernelVersion = domain.Status.OSInfo.KernelVersion
                vmi.Status.GuestOSInfo.Machine = domain.Status.OSInfo.Machine
                vmi.Status.GuestOSInfo.ID = domain.Status.OSInfo.Id
        }
}

func (c *VirtualMachineController) updateAccessCredentialConditions(vmi *v1.VirtualMachineInstance, domain *api.Domain, condManager *controller.VirtualMachineInstanceConditionManager) {

        if domain == nil || domain.Spec.Metadata.KubeVirt.AccessCredential == nil {
                return
        }

        message := domain.Spec.Metadata.KubeVirt.AccessCredential.Message
        status := k8sv1.ConditionFalse
        if domain.Spec.Metadata.KubeVirt.AccessCredential.Succeeded {
                status = k8sv1.ConditionTrue
        }

        add := false
        condition := condManager.GetCondition(vmi, v1.VirtualMachineInstanceAccessCredentialsSynchronized)
        if condition == nil {
                add = true
        } else if condition.Status != status || condition.Message != message {
                // if not as expected, remove, then add.
                condManager.RemoveCondition(vmi, v1.VirtualMachineInstanceAccessCredentialsSynchronized)
                add = true
        }
        if add {
                newCondition := v1.VirtualMachineInstanceCondition{
                        Type:               v1.VirtualMachineInstanceAccessCredentialsSynchronized,
                        LastTransitionTime: metav1.Now(),
                        Status:             status,
                        Message:            message,
                }
                vmi.Status.Conditions = append(vmi.Status.Conditions, newCondition)
                if status == k8sv1.ConditionTrue {
                        c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.AccessCredentialsSyncSuccess.String(), message)
                } else {
                        c.recorder.Event(vmi, k8sv1.EventTypeWarning, v1.AccessCredentialsSyncFailed.String(), message)
                }
        }
}

func (c *VirtualMachineController) updateLiveMigrationConditions(vmi *v1.VirtualMachineInstance, condManager *controller.VirtualMachineInstanceConditionManager) {
        // Calculate whether the VM is migratable
        liveMigrationCondition, isBlockMigration := c.calculateLiveMigrationCondition(vmi)
        if !condManager.HasCondition(vmi, v1.VirtualMachineInstanceIsMigratable) {
                vmi.Status.Conditions = append(vmi.Status.Conditions, *liveMigrationCondition)
                // Set VMI Migration Method
                if isBlockMigration {
                        vmi.Status.MigrationMethod = v1.BlockMigration
                } else {
                        vmi.Status.MigrationMethod = v1.LiveMigration
                }
        } else {
                cond := condManager.GetCondition(vmi, v1.VirtualMachineInstanceIsMigratable)
                if !equality.Semantic.DeepEqual(cond, liveMigrationCondition) {
                        condManager.RemoveCondition(vmi, v1.VirtualMachineInstanceIsMigratable)
                        vmi.Status.Conditions = append(vmi.Status.Conditions, *liveMigrationCondition)
                }
        }
        storageLiveMigCond := c.calculateLiveStorageMigrationCondition(vmi)
        condManager.UpdateCondition(vmi, storageLiveMigCond)
        evictable := migrations.VMIMigratableOnEviction(c.clusterConfig, vmi)
        if evictable && liveMigrationCondition.Status == k8sv1.ConditionFalse {
                c.recorder.Eventf(vmi, k8sv1.EventTypeWarning, v1.Migrated.String(), "EvictionStrategy is set but vmi is not migratable; %s", liveMigrationCondition.Message)
        }
}

func (c *VirtualMachineController) updateGuestAgentConditions(vmi *v1.VirtualMachineInstance, domain *api.Domain, condManager *controller.VirtualMachineInstanceConditionManager) error {

        // Update the condition when GA is connected
        channelConnected := false
        if domain != nil {
                for _, channel := range domain.Spec.Devices.Channels {
                        if channel.Target != nil {
                                log.Log.V(4).Infof("Channel: %s, %s", channel.Target.Name, channel.Target.State)
                                if channel.Target.Name == "org.qemu.guest_agent.0" {
                                        if channel.Target.State == "connected" {
                                                channelConnected = true
                                        }
                                }

                        }
                }
        }

        switch {
        case channelConnected && !condManager.HasCondition(vmi, v1.VirtualMachineInstanceAgentConnected):
                agentCondition := v1.VirtualMachineInstanceCondition{
                        Type:          v1.VirtualMachineInstanceAgentConnected,
                        LastProbeTime: metav1.Now(),
                        Status:        k8sv1.ConditionTrue,
                }
                vmi.Status.Conditions = append(vmi.Status.Conditions, agentCondition)
        case !channelConnected:
                condManager.RemoveCondition(vmi, v1.VirtualMachineInstanceAgentConnected)
        }

        if condManager.HasCondition(vmi, v1.VirtualMachineInstanceAgentConnected) {
                client, err := c.getLauncherClient(vmi)
                if err != nil {
                        return err
                }

                guestInfo, err := client.GetGuestInfo()
                if err != nil {
                        return err
                }

                var supported = false
                var reason = ""

                // For current versions, virt-launcher's supported commands will always contain data.
                // For backwards compatibility: during upgrade from a previous version of KubeVirt,
                // virt-launcher might not provide any supported commands. If the list of supported
                // commands is empty, fall back to previous behavior.
                if len(guestInfo.SupportedCommands) > 0 {
                        supported, reason = isGuestAgentSupported(vmi, guestInfo.SupportedCommands)
                        log.Log.V(3).Object(vmi).Info(reason)
                } else {
                        for _, version := range c.clusterConfig.GetSupportedAgentVersions() {
                                supported = supported || regexp.MustCompile(version).MatchString(guestInfo.GAVersion)
                        }
                        if !supported {
                                reason = fmt.Sprintf("Guest agent version '%s' is not supported", guestInfo.GAVersion)
                        }
                }

                if !supported {
                        if !condManager.HasCondition(vmi, v1.VirtualMachineInstanceUnsupportedAgent) {
                                agentCondition := v1.VirtualMachineInstanceCondition{
                                        Type:          v1.VirtualMachineInstanceUnsupportedAgent,
                                        LastProbeTime: metav1.Now(),
                                        Status:        k8sv1.ConditionTrue,
                                        Reason:        reason,
                                }
                                vmi.Status.Conditions = append(vmi.Status.Conditions, agentCondition)
                        }
                } else {
                        condManager.RemoveCondition(vmi, v1.VirtualMachineInstanceUnsupportedAgent)
                }

        }
        return nil
}

func (c *VirtualMachineController) updatePausedConditions(vmi *v1.VirtualMachineInstance, domain *api.Domain, condManager *controller.VirtualMachineInstanceConditionManager) {

        // Update paused condition in case VMI was paused / unpaused
        if domain != nil && domain.Status.Status == api.Paused {
                if !condManager.HasCondition(vmi, v1.VirtualMachineInstancePaused) {
                        reason := domain.Status.Reason
                        if c.isVMIPausedDuringMigration(vmi) {
                                reason = api.ReasonPausedMigration
                        }
                        calculatePausedCondition(vmi, reason)
                }
        } else if condManager.HasCondition(vmi, v1.VirtualMachineInstancePaused) {
                log.Log.Object(vmi).V(3).Info("Removing paused condition")
                condManager.RemoveCondition(vmi, v1.VirtualMachineInstancePaused)
        }
}

func dumpTargetFile(vmiName, volName string) string {
        targetFileName := fmt.Sprintf("%s-%s-%s.memory.dump", vmiName, volName, time.Now().Format("20060102-150405"))
        return targetFileName
}

func (c *VirtualMachineController) updateMemoryDumpInfo(vmi *v1.VirtualMachineInstance, volumeStatus v1.VolumeStatus, domain *api.Domain) (v1.VolumeStatus, bool) {
        needsRefresh := false
        switch volumeStatus.Phase {
        case v1.HotplugVolumeMounted:
                needsRefresh = true
                log.Log.Object(vmi).V(3).Infof("Memory dump volume %s attached, marking it in progress", volumeStatus.Name)
                volumeStatus.Phase = v1.MemoryDumpVolumeInProgress
                volumeStatus.Message = fmt.Sprintf("Memory dump Volume %s is attached, getting memory dump", volumeStatus.Name)
                volumeStatus.Reason = VolumeMountedToPodReason
                volumeStatus.MemoryDumpVolume.TargetFileName = dumpTargetFile(vmi.Name, volumeStatus.Name)
        case v1.MemoryDumpVolumeInProgress:
                memoryDumpMetadata := domain.Spec.Metadata.KubeVirt.MemoryDump
                if memoryDumpMetadata == nil || memoryDumpMetadata.FileName != volumeStatus.MemoryDumpVolume.TargetFileName {
                        // memory dump wasnt triggered yet
                        return volumeStatus, needsRefresh
                }
                needsRefresh = true
                if memoryDumpMetadata.StartTimestamp != nil {
                        volumeStatus.MemoryDumpVolume.StartTimestamp = memoryDumpMetadata.StartTimestamp
                }
                if memoryDumpMetadata.EndTimestamp != nil && memoryDumpMetadata.Failed {
                        log.Log.Object(vmi).Errorf("Memory dump to pvc %s failed: %v", volumeStatus.Name, memoryDumpMetadata.FailureReason)
                        volumeStatus.Message = fmt.Sprintf("Memory dump to pvc %s failed: %v", volumeStatus.Name, memoryDumpMetadata.FailureReason)
                        volumeStatus.Phase = v1.MemoryDumpVolumeFailed
                        volumeStatus.MemoryDumpVolume.EndTimestamp = memoryDumpMetadata.EndTimestamp
                } else if memoryDumpMetadata.Completed {
                        log.Log.Object(vmi).V(3).Infof("Marking memory dump to volume %s has completed", volumeStatus.Name)
                        volumeStatus.Phase = v1.MemoryDumpVolumeCompleted
                        volumeStatus.Message = fmt.Sprintf("Memory dump to Volume %s has completed successfully", volumeStatus.Name)
                        volumeStatus.Reason = VolumeReadyReason
                        volumeStatus.MemoryDumpVolume.EndTimestamp = memoryDumpMetadata.EndTimestamp
                }
        }

        return volumeStatus, needsRefresh
}

func (c *VirtualMachineController) updateFSFreezeStatus(vmi *v1.VirtualMachineInstance, domain *api.Domain) {

        if domain == nil || domain.Status.FSFreezeStatus.Status == "" {
                return
        }

        if domain.Status.FSFreezeStatus.Status == api.FSThawed {
                vmi.Status.FSFreezeStatus = ""
        } else {
                vmi.Status.FSFreezeStatus = domain.Status.FSFreezeStatus.Status
        }

}

func IsoGuestVolumePath(namespace, name string, volume *v1.Volume) string {
        const basepath = "/var/run"
        switch {
        case volume.CloudInitNoCloud != nil:
                return filepath.Join(basepath, "kubevirt-ephemeral-disks", "cloud-init-data", namespace, name, "noCloud.iso")
        case volume.CloudInitConfigDrive != nil:
                return filepath.Join(basepath, "kubevirt-ephemeral-disks", "cloud-init-data", namespace, name, "configdrive.iso")
        case volume.ConfigMap != nil:
                return config.GetConfigMapDiskPath(volume.Name)
        case volume.DownwardAPI != nil:
                return config.GetDownwardAPIDiskPath(volume.Name)
        case volume.Secret != nil:
                return config.GetSecretDiskPath(volume.Name)
        case volume.ServiceAccount != nil:
                return config.GetServiceAccountDiskPath()
        case volume.Sysprep != nil:
                return config.GetSysprepDiskPath(volume.Name)
        default:
                return ""
        }
}

func (c *VirtualMachineController) updateIsoSizeStatus(vmi *v1.VirtualMachineInstance) {
        var podUID string
        if vmi.Status.Phase != v1.Running {
                return
        }

        for k, v := range vmi.Status.ActivePods {
                if v == vmi.Status.NodeName {
                        podUID = string(k)
                        break
                }
        }
        if podUID == "" {
                log.DefaultLogger().Warningf("failed to find pod UID for VMI %s", vmi.Name)
                return
        }

        volumes := make(map[string]v1.Volume)
        for _, volume := range vmi.Spec.Volumes {
                volumes[volume.Name] = volume
        }

        for _, disk := range vmi.Spec.Domain.Devices.Disks {
                volume, ok := volumes[disk.Name]
                if !ok {
                        log.DefaultLogger().Warningf("No matching volume with name %s found", disk.Name)
                        continue
                }

                volPath := IsoGuestVolumePath(vmi.Namespace, vmi.Name, &volume)
                if volPath == "" {
                        continue
                }

                res, err := c.podIsolationDetector.Detect(vmi)
                if err != nil {
                        log.DefaultLogger().Reason(err).Warningf("failed to detect VMI %s", vmi.Name)
                        continue
                }

                rootPath, err := res.MountRoot()
                if err != nil {
                        log.DefaultLogger().Reason(err).Warningf("failed to detect VMI %s", vmi.Name)
                        continue
                }

                safeVolPath, err := rootPath.AppendAndResolveWithRelativeRoot(volPath)
                if err != nil {
                        log.DefaultLogger().Warningf("failed to determine file size for volume %s", volPath)
                        continue
                }
                fileInfo, err := safepath.StatAtNoFollow(safeVolPath)
                if err != nil {
                        log.DefaultLogger().Warningf("failed to determine file size for volume %s", volPath)
                        continue
                }

                for i := range vmi.Status.VolumeStatus {
                        if vmi.Status.VolumeStatus[i].Name == volume.Name {
                                vmi.Status.VolumeStatus[i].Size = fileInfo.Size()
                                continue
                        }
                }
        }
}

func (c *VirtualMachineController) updateSELinuxContext(vmi *v1.VirtualMachineInstance) error {
        _, present, err := selinux.NewSELinux()
        if err != nil {
                return err
        }
        if present {
                context, err := selinux.GetVirtLauncherContext(vmi)
                if err != nil {
                        return err
                }
                vmi.Status.SelinuxContext = context
        } else {
                vmi.Status.SelinuxContext = "none"
        }

        return nil
}

func (c *VirtualMachineController) updateVMIStatusFromDomain(vmi *v1.VirtualMachineInstance, domain *api.Domain) error {
        c.updateIsoSizeStatus(vmi)
        err := c.updateSELinuxContext(vmi)
        if err != nil {
                log.Log.Reason(err).Errorf("couldn't find the SELinux context for %s", vmi.Name)
        }
        c.setMigrationProgressStatus(vmi, domain)
        c.updateGuestInfoFromDomain(vmi, domain)
        c.updateVolumeStatusesFromDomain(vmi, domain)
        c.updateFSFreezeStatus(vmi, domain)
        c.updateMachineType(vmi, domain)
        if err = c.updateMemoryInfo(vmi, domain); err != nil {
                return err
        }
        err = c.netStat.UpdateStatus(vmi, domain)
        return err
}

func (c *VirtualMachineController) updateVMIConditions(vmi *v1.VirtualMachineInstance, domain *api.Domain, condManager *controller.VirtualMachineInstanceConditionManager) error {
        c.updateAccessCredentialConditions(vmi, domain, condManager)
        c.updateLiveMigrationConditions(vmi, condManager)
        err := c.updateGuestAgentConditions(vmi, domain, condManager)
        if err != nil {
                return err
        }
        c.updatePausedConditions(vmi, domain, condManager)

        return nil
}

func (c *VirtualMachineController) updateVMIStatus(origVMI *v1.VirtualMachineInstance, domain *api.Domain, syncError error) (err error) {
        condManager := controller.NewVirtualMachineInstanceConditionManager()

        // Don't update the VirtualMachineInstance if it is already in a final state
        if origVMI.IsFinal() {
                return nil
        } else if origVMI.Status.NodeName != "" && origVMI.Status.NodeName != c.host {
                // Only update the VMI's phase if this node owns the VMI.
                // not owned by this host, likely the result of a migration
                return nil
        } else if domainMigrated(domain) {
                return c.migrationSourceUpdateVMIStatus(origVMI, domain)
        }

        vmi := origVMI.DeepCopy()
        oldStatus := *vmi.Status.DeepCopy()

        // Update VMI status fields based on what is reported on the domain
        err = c.updateVMIStatusFromDomain(vmi, domain)
        if err != nil {
                return err
        }

        // Calculate the new VirtualMachineInstance state based on what libvirt reported
        err = c.setVmPhaseForStatusReason(domain, vmi)
        if err != nil {
                return err
        }

        // Update conditions on VMI Status
        err = c.updateVMIConditions(vmi, domain, condManager)
        if err != nil {
                return err
        }

        // Store containerdisks and kernelboot checksums
        if err := c.updateChecksumInfo(vmi, syncError); err != nil {
                return err
        }

        // Handle sync error
        handleSyncError(vmi, condManager, syncError)

        controller.SetVMIPhaseTransitionTimestamp(origVMI, vmi)

        // Only issue vmi update if status has changed
        if !equality.Semantic.DeepEqual(oldStatus, vmi.Status) {
                key := controller.VirtualMachineInstanceKey(vmi)
                c.vmiExpectations.SetExpectations(key, 1, 0)
                _, err = c.clientset.VirtualMachineInstance(vmi.ObjectMeta.Namespace).Update(context.Background(), vmi, metav1.UpdateOptions{})
                if err != nil {
                        c.vmiExpectations.LowerExpectations(key, 1, 0)
                        return err
                }
        }

        // Record an event on the VMI when the VMI's phase changes
        if oldStatus.Phase != vmi.Status.Phase {
                c.recordPhaseChangeEvent(vmi)
        }

        return nil
}

func handleSyncError(vmi *v1.VirtualMachineInstance, condManager *controller.VirtualMachineInstanceConditionManager, syncError error) {
        var criticalNetErr *neterrors.CriticalNetworkError
        if goerror.As(syncError, &criticalNetErr) {
                log.Log.Errorf("virt-launcher crashed due to a network error. Updating VMI %s status to Failed", vmi.Name)
                vmi.Status.Phase = v1.Failed
        }
        if _, ok := syncError.(*virtLauncherCriticalSecurebootError); ok {
                log.Log.Errorf("virt-launcher does not support the Secure Boot setting. Updating VMI %s status to Failed", vmi.Name)
                vmi.Status.Phase = v1.Failed
        }

        if _, ok := syncError.(*vmiIrrecoverableError); ok {
                log.Log.Errorf("virt-launcher reached an irrecoverable error. Updating VMI %s status to Failed", vmi.Name)
                vmi.Status.Phase = v1.Failed
        }
        condManager.CheckFailure(vmi, syncError, "Synchronizing with the Domain failed.")
}

func (c *VirtualMachineController) recordPhaseChangeEvent(vmi *v1.VirtualMachineInstance) {
        switch vmi.Status.Phase {
        case v1.Running:
                c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.Started.String(), VMIStarted)
        case v1.Succeeded:
                c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.Stopped.String(), VMIShutdown)
        case v1.Failed:
                c.recorder.Event(vmi, k8sv1.EventTypeWarning, v1.Stopped.String(), VMICrashed)
        }
}

func calculatePausedCondition(vmi *v1.VirtualMachineInstance, reason api.StateChangeReason) {
        now := metav1.NewTime(time.Now())
        switch reason {
        case api.ReasonPausedMigration:
                log.Log.Object(vmi).V(3).Info("Adding paused condition")
                vmi.Status.Conditions = append(vmi.Status.Conditions, v1.VirtualMachineInstanceCondition{
                        Type:               v1.VirtualMachineInstancePaused,
                        Status:             k8sv1.ConditionTrue,
                        LastProbeTime:      now,
                        LastTransitionTime: now,
                        Reason:             "PausedByMigrationMonitor",
                        Message:            "VMI was paused by the migration monitor",
                })
        case api.ReasonPausedUser:
                log.Log.Object(vmi).V(3).Info("Adding paused condition")
                vmi.Status.Conditions = append(vmi.Status.Conditions, v1.VirtualMachineInstanceCondition{
                        Type:               v1.VirtualMachineInstancePaused,
                        Status:             k8sv1.ConditionTrue,
                        LastProbeTime:      now,
                        LastTransitionTime: now,
                        Reason:             "PausedByUser",
                        Message:            "VMI was paused by user",
                })
        case api.ReasonPausedIOError:
                log.Log.Object(vmi).V(3).Info("Adding paused condition")
                vmi.Status.Conditions = append(vmi.Status.Conditions, v1.VirtualMachineInstanceCondition{
                        Type:               v1.VirtualMachineInstancePaused,
                        Status:             k8sv1.ConditionTrue,
                        LastProbeTime:      now,
                        LastTransitionTime: now,
                        Reason:             "PausedIOError",
                        Message:            "VMI was paused, low-level IO error detected",
                })
        default:
                log.Log.Object(vmi).V(3).Infof("Domain is paused for unknown reason, %s", reason)
        }
}

func newNonMigratableCondition(msg string, reason string) *v1.VirtualMachineInstanceCondition {
        return &v1.VirtualMachineInstanceCondition{
                Type:    v1.VirtualMachineInstanceIsMigratable,
                Status:  k8sv1.ConditionFalse,
                Message: msg,
                Reason:  reason,
        }
}

func (c *VirtualMachineController) calculateLiveMigrationCondition(vmi *v1.VirtualMachineInstance) (*v1.VirtualMachineInstanceCondition, bool) {
        isBlockMigration, err := c.checkVolumesForMigration(vmi)
        if err != nil {
                return newNonMigratableCondition(err.Error(), v1.VirtualMachineInstanceReasonDisksNotMigratable), isBlockMigration
        }

        err = c.checkNetworkInterfacesForMigration(vmi)
        if err != nil {
                return newNonMigratableCondition(err.Error(), v1.VirtualMachineInstanceReasonInterfaceNotMigratable), isBlockMigration
        }

        if err := c.isHostModelMigratable(vmi); err != nil {
                return newNonMigratableCondition(err.Error(), v1.VirtualMachineInstanceReasonCPUModeNotMigratable), isBlockMigration
        }

        if vmiContainsPCIHostDevice(vmi) {
                return newNonMigratableCondition("VMI uses a PCI host devices", v1.VirtualMachineInstanceReasonHostDeviceNotMigratable), isBlockMigration
        }

        if util.IsSEVVMI(vmi) {
                return newNonMigratableCondition("VMI uses SEV", v1.VirtualMachineInstanceReasonSEVNotMigratable), isBlockMigration
        }

        if reservation.HasVMIPersistentReservation(vmi) {
                return newNonMigratableCondition("VMI uses SCSI persitent reservation", v1.VirtualMachineInstanceReasonPRNotMigratable), isBlockMigration
        }

        if tscRequirement := topology.GetTscFrequencyRequirement(vmi); !topology.AreTSCFrequencyTopologyHintsDefined(vmi) && tscRequirement.Type == topology.RequiredForMigration {
                return newNonMigratableCondition(tscRequirement.Reason, v1.VirtualMachineInstanceReasonNoTSCFrequencyMigratable), isBlockMigration
        }

        if vmiFeatures := vmi.Spec.Domain.Features; vmiFeatures != nil && vmiFeatures.HypervPassthrough != nil && *vmiFeatures.HypervPassthrough.Enabled {
                return newNonMigratableCondition("VMI uses hyperv passthrough", v1.VirtualMachineInstanceReasonHypervPassthroughNotMigratable), isBlockMigration
        }

        return &v1.VirtualMachineInstanceCondition{
                Type:   v1.VirtualMachineInstanceIsMigratable,
                Status: k8sv1.ConditionTrue,
        }, isBlockMigration
}

func vmiContainsPCIHostDevice(vmi *v1.VirtualMachineInstance) bool {
        return len(vmi.Spec.Domain.Devices.HostDevices) > 0 || len(vmi.Spec.Domain.Devices.GPUs) > 0
}

type multipleNonMigratableCondition struct {
        reasons []string
        msgs    []string
}

func newMultipleNonMigratableCondition() *multipleNonMigratableCondition {
        return &multipleNonMigratableCondition{}
}

func (cond *multipleNonMigratableCondition) addNonMigratableCondition(reason, msg string) {
        cond.reasons = append(cond.reasons, reason)
        cond.msgs = append(cond.msgs, msg)
}

func (cond *multipleNonMigratableCondition) String() string {
        var buffer bytes.Buffer
        for i, c := range cond.reasons {
                if i > 0 {
                        buffer.WriteString(", ")
                }
                buffer.WriteString(fmt.Sprintf("%s: %s", c, cond.msgs[i]))
        }
        return buffer.String()
}

func (cond *multipleNonMigratableCondition) generateStorageLiveMigrationCondition() *v1.VirtualMachineInstanceCondition {
        switch len(cond.reasons) {
        case 0:
                return &v1.VirtualMachineInstanceCondition{
                        Type:   v1.VirtualMachineInstanceIsStorageLiveMigratable,
                        Status: k8sv1.ConditionTrue,
                }
        default:
                return &v1.VirtualMachineInstanceCondition{
                        Type:    v1.VirtualMachineInstanceIsStorageLiveMigratable,
                        Status:  k8sv1.ConditionFalse,
                        Message: cond.String(),
                        Reason:  v1.VirtualMachineInstanceReasonNotMigratable,
                }
        }
}

func (c *VirtualMachineController) calculateLiveStorageMigrationCondition(vmi *v1.VirtualMachineInstance) *v1.VirtualMachineInstanceCondition {
        multiCond := newMultipleNonMigratableCondition()

        if err := c.checkNetworkInterfacesForMigration(vmi); err != nil {
                multiCond.addNonMigratableCondition(v1.VirtualMachineInstanceReasonInterfaceNotMigratable, err.Error())
        }

        if err := c.isHostModelMigratable(vmi); err != nil {
                multiCond.addNonMigratableCondition(v1.VirtualMachineInstanceReasonCPUModeNotMigratable, err.Error())
        }

        if vmiContainsPCIHostDevice(vmi) {
                multiCond.addNonMigratableCondition(v1.VirtualMachineInstanceReasonHostDeviceNotMigratable, "VMI uses a PCI host devices")
        }

        if util.IsSEVVMI(vmi) {
                multiCond.addNonMigratableCondition(v1.VirtualMachineInstanceReasonSEVNotMigratable, "VMI uses SEV")
        }

        if reservation.HasVMIPersistentReservation(vmi) {
                multiCond.addNonMigratableCondition(v1.VirtualMachineInstanceReasonPRNotMigratable, "VMI uses SCSI persitent reservation")
        }

        if tscRequirement := topology.GetTscFrequencyRequirement(vmi); !topology.AreTSCFrequencyTopologyHintsDefined(vmi) && tscRequirement.Type == topology.RequiredForMigration {
                multiCond.addNonMigratableCondition(v1.VirtualMachineInstanceReasonNoTSCFrequencyMigratable, tscRequirement.Reason)
        }

        if vmiFeatures := vmi.Spec.Domain.Features; vmiFeatures != nil && vmiFeatures.HypervPassthrough != nil && *vmiFeatures.HypervPassthrough.Enabled {
                multiCond.addNonMigratableCondition(v1.VirtualMachineInstanceReasonHypervPassthroughNotMigratable, "VMI uses hyperv passthrough")
        }

        return multiCond.generateStorageLiveMigrationCondition()
}

func (c *VirtualMachineController) Run(threadiness int, stopCh chan struct{}) {
        defer c.queue.ShutDown()
        log.Log.Info("Starting virt-handler controller.")

        go c.deviceManagerController.Run(stopCh)

        go c.downwardMetricsManager.Run(stopCh)

        cache.WaitForCacheSync(stopCh, c.hasSynced)

        // queue keys for previous Domains on the host that no longer exist
        // in the cache. This ensures we perform local cleanup of deleted VMs.
        for _, domain := range c.domainStore.List() {
                d := domain.(*api.Domain)
                vmiRef := v1.NewVMIReferenceWithUUID(
                        d.ObjectMeta.Namespace,
                        d.ObjectMeta.Name,
                        d.Spec.Metadata.KubeVirt.UID)

                key := controller.VirtualMachineInstanceKey(vmiRef)

                _, exists, _ := c.vmiSourceStore.GetByKey(key)
                if !exists {
                        c.queue.Add(key)
                }
        }

        heartBeatDone := c.heartBeat.Run(c.heartBeatInterval, stopCh)

        go c.ioErrorRetryManager.Run(stopCh)

        // Start the actual work
        for i := 0; i < threadiness; i++ {
                go wait.Until(c.runWorker, time.Second, stopCh)
        }

        <-heartBeatDone
        <-stopCh
        log.Log.Info("Stopping virt-handler controller.")
}

func (c *VirtualMachineController) runWorker() {
        for c.Execute() {
        }
}

func (c *VirtualMachineController) Execute() bool {
        key, quit := c.queue.Get()
        if quit {
                return false
        }
        defer c.queue.Done(key)
        if err := c.execute(key); err != nil {
                log.Log.Reason(err).Infof("re-enqueuing VirtualMachineInstance %v", key)
                c.queue.AddRateLimited(key)
        } else {
                log.Log.V(4).Infof("processed VirtualMachineInstance %v", key)
                c.queue.Forget(key)
        }
        return true
}

func (c *VirtualMachineController) getVMIFromCache(key string) (vmi *v1.VirtualMachineInstance, exists bool, err error) {

        // Fetch the latest Vm state from cache
        obj, exists, err := c.vmiSourceStore.GetByKey(key)
        if err != nil {
                return nil, false, err
        }

        if !exists {
                obj, exists, err = c.vmiTargetStore.GetByKey(key)
                if err != nil {
                        return nil, false, err
                }
        }

        // Retrieve the VirtualMachineInstance
        if !exists {
                namespace, name, err := cache.SplitMetaNamespaceKey(key)
                if err != nil {
                        // TODO log and don't retry
                        return nil, false, err
                }
                vmi = v1.NewVMIReferenceFromNameWithNS(namespace, name)
        } else {
                vmi = obj.(*v1.VirtualMachineInstance)
        }
        return vmi, exists, nil
}

func (c *VirtualMachineController) getDomainFromCache(key string) (domain *api.Domain, exists bool, cachedUID types.UID, err error) {

        obj, exists, err := c.domainStore.GetByKey(key)

        if err != nil {
                return nil, false, "", err
        }

        if exists {
                domain = obj.(*api.Domain)
                cachedUID = domain.Spec.Metadata.KubeVirt.UID

                // We're using the DeletionTimestamp to signify that the
                // Domain is deleted rather than sending the DELETE watch event.
                if domain.ObjectMeta.DeletionTimestamp != nil {
                        exists = false
                        domain = nil
                }
        }
        return domain, exists, cachedUID, nil
}

func (c *VirtualMachineController) migrationOrphanedSourceNodeExecute(vmi *v1.VirtualMachineInstance, domainExists bool) error {

        if domainExists {
                err := c.processVmDelete(vmi)
                if err != nil {
                        return err
                }
                // we can perform the cleanup immediately after
                // the successful delete here because we don't have
                // to report the deletion results on the VMI status
                // in this case.
                err = c.processVmCleanup(vmi)
                if err != nil {
                        return err
                }
        } else {
                err := c.processVmCleanup(vmi)
                if err != nil {
                        return err
                }
        }
        return nil
}

func (c *VirtualMachineController) migrationTargetExecute(vmi *v1.VirtualMachineInstance, vmiExists bool, domain *api.Domain) error {

        // set to true when preparation of migration target should be aborted.
        shouldAbort := false
        // set to true when VirtualMachineInstance migration target needs to be prepared
        shouldUpdate := false
        // set true when the current migration target has exitted and needs to be cleaned up.
        shouldCleanUp := false

        if vmiExists && vmi.IsRunning() {
                shouldUpdate = true
        }

        if !vmiExists || vmi.DeletionTimestamp != nil {
                shouldAbort = true
        } else if vmi.IsFinal() {
                shouldAbort = true
        } else if c.hasStaleClientConnections(vmi) {
                // if stale client exists, force cleanup.
                // This can happen as a result of a previously
                // failed attempt to migrate the vmi to this node.
                shouldCleanUp = true
        }

        domainExists := domain != nil
        if shouldAbort {
                if domainExists {
                        err := c.processVmDelete(vmi)
                        if err != nil {
                                return err
                        }
                }

                err := c.processVmCleanup(vmi)
                if err != nil {
                        return err
                }
        } else if shouldCleanUp {
                log.Log.Object(vmi).Infof("Stale client for migration target found. Cleaning up.")

                err := c.processVmCleanup(vmi)
                if err != nil {
                        return err
                }

                // if we're still the migration target, we need to keep trying until the migration fails.
                // it's possible we're simply waiting for another target pod to come online.
                c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Second*1)

        } else if shouldUpdate {
                log.Log.Object(vmi).Info("Processing vmi migration target update")

                // prepare the POD for the migration
                err := c.processVmUpdate(vmi, domain)
                if err != nil {
                        return err
                }

                err = c.migrationTargetUpdateVMIStatus(vmi, domain)
                if err != nil {
                        return err
                }
        }

        return nil
}

// Determine if gracefulShutdown has been triggered by virt-launcher
func (c *VirtualMachineController) hasGracefulShutdownTrigger(domain *api.Domain) bool {
        if domain == nil {
                return false
        }
        gracePeriod := domain.Spec.Metadata.KubeVirt.GracePeriod

        return gracePeriod != nil &&
                gracePeriod.MarkedForGracefulShutdown != nil &&
                *gracePeriod.MarkedForGracefulShutdown
}

func (c *VirtualMachineController) defaultExecute(key string,
        vmi *v1.VirtualMachineInstance,
        vmiExists bool,
        domain *api.Domain,
        domainExists bool) error {

        // set to true when domain needs to be shutdown.
        shouldShutdown := false
        // set to true when domain needs to be removed from libvirt.
        shouldDelete := false
        // optimization. set to true when processing already deleted domain.
        shouldCleanUp := false
        // set to true when VirtualMachineInstance is active or about to become active.
        shouldUpdate := false
        // set true to ensure that no updates to the current VirtualMachineInstance state will occur
        forceIgnoreSync := false
        // set to true when unrecoverable domain needs to be destroyed non-gracefully.
        forceShutdownIrrecoverable := false

        log.Log.V(3).Infof("Processing event %v", key)

        if vmiExists && domainExists {
                log.Log.Object(vmi).Infof("VMI is in phase: %v | Domain status: %v, reason: %v", vmi.Status.Phase, domain.Status.Status, domain.Status.Reason)
        } else if vmiExists {
                log.Log.Object(vmi).Infof("VMI is in phase: %v | Domain does not exist", vmi.Status.Phase)
        } else if domainExists {
                vmiRef := v1.NewVMIReferenceWithUUID(domain.ObjectMeta.Namespace, domain.ObjectMeta.Name, domain.Spec.Metadata.KubeVirt.UID)
                log.Log.Object(vmiRef).Infof("VMI does not exist | Domain status: %v, reason: %v", domain.Status.Status, domain.Status.Reason)
        } else {
                log.Log.Info("VMI does not exist | Domain does not exist")
        }

        domainAlive := domainExists &&
                domain.Status.Status != api.Shutoff &&
                domain.Status.Status != api.Crashed &&
                domain.Status.Status != ""

        domainMigrated := domainExists && domainMigrated(domain)
        forceShutdownIrrecoverable = domainExists && domainPausedFailedPostCopy(domain)

        gracefulShutdown := c.hasGracefulShutdownTrigger(domain)
        if gracefulShutdown && vmi.IsRunning() {
                if domainAlive {
                        log.Log.Object(vmi).V(3).Info("Shutting down due to graceful shutdown signal.")
                        shouldShutdown = true
                } else {
                        shouldDelete = true
                }
        }

        // Determine removal of VirtualMachineInstance from cache should result in deletion.
        if !vmiExists {
                switch {
                case domainAlive:
                        // The VirtualMachineInstance is deleted on the cluster, and domain is alive,
                        // then shut down the domain.
                        log.Log.Object(vmi).V(3).Info("Shutting down domain for deleted VirtualMachineInstance object.")
                        shouldShutdown = true
                case domainExists:
                        // The VirtualMachineInstance is deleted on the cluster, and domain is not alive
                        // then delete the domain.
                        log.Log.Object(vmi).V(3).Info("Deleting domain for deleted VirtualMachineInstance object.")
                        shouldDelete = true
                default:
                        // If neither the domain nor the vmi object exist locally,
                        // then ensure any remaining local ephemeral data is cleaned up.
                        shouldCleanUp = true
                }
        }

        // Determine if VirtualMachineInstance is being deleted.
        if vmiExists && vmi.ObjectMeta.DeletionTimestamp != nil {
                switch {
                case domainAlive:
                        log.Log.Object(vmi).V(3).Info("Shutting down domain for VirtualMachineInstance with deletion timestamp.")
                        shouldShutdown = true
                case domainExists:
                        log.Log.Object(vmi).V(3).Info("Deleting domain for VirtualMachineInstance with deletion timestamp.")
                        shouldDelete = true
                default:
                        if vmi.IsFinal() {
                                shouldCleanUp = true
                        }
                }
        }

        // Determine if domain needs to be deleted as a result of VirtualMachineInstance
        // shutting down naturally (guest internal invoked shutdown)
        if domainExists && vmiExists && vmi.IsFinal() {
                log.Log.Object(vmi).V(3).Info("Removing domain and ephemeral data for finalized vmi.")
                shouldDelete = true
        } else if !domainExists && vmiExists && vmi.IsFinal() {
                log.Log.Object(vmi).V(3).Info("Cleaning up local data for finalized vmi.")
                shouldCleanUp = true
        }

        // Determine if an active (or about to be active) VirtualMachineInstance should be updated.
        if vmiExists && !vmi.IsFinal() {
                // requiring the phase of the domain and VirtualMachineInstance to be in sync is an
                // optimization that prevents unnecessary re-processing VMIs during the start flow.
                phase, err := c.calculateVmPhaseForStatusReason(domain, vmi)
                if err != nil {
                        return err
                }
                if vmi.Status.Phase == phase {
                        shouldUpdate = true
                }

                if shouldDelay, delay := c.ioErrorRetryManager.ShouldDelay(string(vmi.UID), func() bool {
                        return isIOError(shouldUpdate, domainExists, domain)
                }); shouldDelay {
                        shouldUpdate = false
                        log.Log.Object(vmi).Infof("Delay vm update for %f seconds", delay.Seconds())
                        c.queue.AddAfter(key, delay)
                }
        }

        // NOTE: This must be the last check that occurs before checking the sync booleans!
        //
        // Special logic for domains migrated from a source node.
        // Don't delete/destroy domain until the handoff occurs.
        if domainMigrated {
                // only allow the sync to occur on the domain once we've done
                // the node handoff. Otherwise we potentially lose the fact that
                // the domain migrated because we'll attempt to delete the locally
                // shut off domain during the sync.
                if vmiExists &&
                        !vmi.IsFinal() &&
                        vmi.DeletionTimestamp == nil &&
                        vmi.Status.NodeName != "" &&
                        vmi.Status.NodeName == c.host {

                        // If the domain migrated but the VMI still thinks this node
                        // is the host, force ignore the sync until the VMI's status
                        // is updated to reflect the node the domain migrated to.
                        forceIgnoreSync = true
                }
        }

        var syncErr error

        // Process the VirtualMachineInstance update in this order.
        // * Shutdown and Deletion due to VirtualMachineInstance deletion, process stopping, graceful shutdown trigger, etc...
        // * Cleanup of already shutdown and Deleted VMIs
        // * Update due to spec change and initial start flow.
        switch {
        case forceIgnoreSync:
                log.Log.Object(vmi).V(3).Info("No update processing required: forced ignore")
        case shouldShutdown:
                log.Log.Object(vmi).V(3).Info("Processing shutdown.")
                syncErr = c.processVmShutdown(vmi, domain)
        case forceShutdownIrrecoverable:
                msg := formatIrrecoverableErrorMessage(domain)
                log.Log.Object(vmi).V(3).Infof("Processing a destruction of an irrecoverable domain - %s.", msg)
                syncErr = c.processVmDestroy(vmi, domain)
                if syncErr == nil {
                        syncErr = &vmiIrrecoverableError{msg}
                }
        case shouldDelete:
                log.Log.Object(vmi).V(3).Info("Processing deletion.")
                syncErr = c.processVmDelete(vmi)
        case shouldCleanUp:
                log.Log.Object(vmi).V(3).Info("Processing local ephemeral data cleanup for shutdown domain.")
                syncErr = c.processVmCleanup(vmi)
        case shouldUpdate:
                log.Log.Object(vmi).V(3).Info("Processing vmi update")
                syncErr = c.processVmUpdate(vmi, domain)
        default:
                log.Log.Object(vmi).V(3).Info("No update processing required")
        }

        if syncErr != nil && !vmi.IsFinal() {
                c.recorder.Event(vmi, k8sv1.EventTypeWarning, v1.SyncFailed.String(), syncErr.Error())

                // `syncErr` will be propagated anyway, and it will be logged in `re-enqueueing`
                // so there is no need to log it twice in hot path without increased verbosity.
                log.Log.Object(vmi).Reason(syncErr).Error("Synchronizing the VirtualMachineInstance failed.")
        }

        // Update the VirtualMachineInstance status, if the VirtualMachineInstance exists
        if vmiExists {
                if err := c.updateVMIStatus(vmi, domain, syncErr); err != nil {
                        log.Log.Object(vmi).Reason(err).Error("Updating the VirtualMachineInstance status failed.")
                        return err
                }
        }

        if syncErr != nil {
                return syncErr
        }

        log.Log.Object(vmi).V(3).Info("Synchronization loop succeeded.")
        return nil

}

func (c *VirtualMachineController) execute(key string) error {
        vmi, vmiExists, err := c.getVMIFromCache(key)
        if err != nil {
                return err
        }

        if !vmiExists {
                c.vmiExpectations.DeleteExpectations(key)
        } else if !c.vmiExpectations.SatisfiedExpectations(key) {
                return nil
        }

        domain, domainExists, domainCachedUID, err := c.getDomainFromCache(key)
        if err != nil {
                return err
        }

        if !vmiExists && string(domainCachedUID) != "" {
                // it's possible to discover the UID from cache even if the domain
                // doesn't technically exist anymore
                vmi.UID = domainCachedUID
                log.Log.Object(vmi).Infof("Using cached UID for vmi found in domain cache")
        }

        // As a last effort, if the UID still can't be determined attempt
        // to retrieve it from the ghost record
        if string(vmi.UID) == "" {
                uid := virtcache.LastKnownUIDFromGhostRecordCache(key)
                if uid != "" {
                        log.Log.Object(vmi).V(3).Infof("ghost record cache provided %s as UID", uid)
                        vmi.UID = uid
                }
        }

        if vmiExists && domainExists && domain.Spec.Metadata.KubeVirt.UID != vmi.UID {
                oldVMI := v1.NewVMIReferenceFromNameWithNS(vmi.Namespace, vmi.Name)
                oldVMI.UID = domain.Spec.Metadata.KubeVirt.UID
                expired, initialized, err := c.isLauncherClientUnresponsive(oldVMI)
                if err != nil {
                        return err
                }
                // If we found an outdated domain which is also not alive anymore, clean up
                if !initialized {
                        c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Second*1)
                        return nil
                } else if expired {
                        log.Log.Object(oldVMI).Infof("Detected stale vmi %s that still needs cleanup before new vmi %s with identical name/namespace can be processed", oldVMI.UID, vmi.UID)
                        err = c.processVmCleanup(oldVMI)
                        if err != nil {
                                return err
                        }
                        // Make sure we re-enqueue the key to ensure this new VMI is processed
                        // after the stale domain is removed
                        c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Second*5)
                }

                return nil
        }

        // Take different execution paths depending on the state of the migration and the
        // node this is executed on.

        if vmiExists && c.isPreMigrationTarget(vmi) {
                // 1. PRE-MIGRATION TARGET PREPARATION PATH
                //
                // If this node is the target of the vmi's migration, take
                // a different execute path. The target execute path prepares
                // the local environment for the migration, but does not
                // start the VMI
                return c.migrationTargetExecute(vmi, vmiExists, domain)
        } else if vmiExists && c.isOrphanedMigrationSource(vmi) {
                // 3. POST-MIGRATION SOURCE CLEANUP
                //
                // After a migration, the migrated domain still exists in the old
                // source's domain cache. Ensure that any node that isn't currently
                // the target or owner of the VMI handles deleting the domain locally.
                return c.migrationOrphanedSourceNodeExecute(vmi, domainExists)
        }
        return c.defaultExecute(key,
                vmi,
                vmiExists,
                domain,
                domainExists)

}

func (c *VirtualMachineController) processVmCleanup(vmi *v1.VirtualMachineInstance) error {

        vmiId := string(vmi.UID)

        log.Log.Object(vmi).Infof("Performing final local cleanup for vmi with uid %s", vmiId)

        c.migrationProxy.StopTargetListener(vmiId)
        c.migrationProxy.StopSourceListener(vmiId)

        c.downwardMetricsManager.StopServer(vmi)

        // Unmount container disks and clean up remaining files
        if err := c.containerDiskMounter.Unmount(vmi); err != nil {
                return err
        }

        // UnmountAll does the cleanup on the "best effort" basis: it is
        // safe to pass a nil cgroupManager.
        cgroupManager, _ := getCgroupManager(vmi)
        if err := c.hotplugVolumeMounter.UnmountAll(vmi, cgroupManager); err != nil {
                return err
        }

        c.teardownNetwork(vmi)

        c.sriovHotplugExecutorPool.Delete(vmi.UID)

        // Watch dog file and command client must be the last things removed here
        if err := c.closeLauncherClient(vmi); err != nil {
                return err
        }

        // Remove the domain from cache in the event that we're performing
        // a final cleanup and never received the "DELETE" event. This is
        // possible if the VMI pod goes away before we receive the final domain
        // "DELETE"
        domain := api.NewDomainReferenceFromName(vmi.Namespace, vmi.Name)
        log.Log.Object(domain).Infof("Removing domain from cache during final cleanup")
        return c.domainStore.Delete(domain)
}

func (c *VirtualMachineController) closeLauncherClient(vmi *v1.VirtualMachineInstance) error {

        // UID is required in order to close socket
        if string(vmi.GetUID()) == "" {
                return nil
        }

        clientInfo, exists := c.launcherClients.Load(vmi.UID)
        if exists && clientInfo.Client != nil {
                clientInfo.Client.Close()
                close(clientInfo.DomainPipeStopChan)
        }

        virtcache.DeleteGhostRecord(vmi.Namespace, vmi.Name)
        c.launcherClients.Delete(vmi.UID)
        return nil
}

// used by unit tests to add mock clients
func (c *VirtualMachineController) addLauncherClient(vmUID types.UID, info *virtcache.LauncherClientInfo) error {
        c.launcherClients.Store(vmUID, info)
        return nil
}

func (c *VirtualMachineController) isLauncherClientUnresponsive(vmi *v1.VirtualMachineInstance) (unresponsive bool, initialized bool, err error) {
        var socketFile string

        clientInfo, exists := c.launcherClients.Load(vmi.UID)
        if exists {
                if clientInfo.Ready == true {
                        // use cached socket if we previously established a connection
                        socketFile = clientInfo.SocketFile
                } else {
                        socketFile, err = cmdclient.FindSocketOnHost(vmi)
                        if err != nil {
                                // socket does not exist, but let's see if the pod is still there
                                if _, err = cmdclient.FindPodDirOnHost(vmi); err != nil {
                                        // no pod meanst that waiting for it to initialize makes no sense
                                        return true, true, nil
                                }
                                // pod is still there, if there is no socket let's wait for it to become ready
                                if clientInfo.NotInitializedSince.Before(time.Now().Add(-3 * time.Minute)) {
                                        return true, true, nil
                                }
                                return false, false, nil
                        }
                        clientInfo.Ready = true
                        clientInfo.SocketFile = socketFile
                }
        } else {
                clientInfo := &virtcache.LauncherClientInfo{
                        NotInitializedSince: time.Now(),
                        Ready:               false,
                }
                c.launcherClients.Store(vmi.UID, clientInfo)
                // attempt to find the socket if the established connection doesn't currently exist.
                socketFile, err = cmdclient.FindSocketOnHost(vmi)
                // no socket file, no VMI, so it's unresponsive
                if err != nil {
                        // socket does not exist, but let's see if the pod is still there
                        if _, err = cmdclient.FindPodDirOnHost(vmi); err != nil {
                                // no pod meanst that waiting for it to initialize makes no sense
                                return true, true, nil
                        }
                        return false, false, nil
                }
                clientInfo.Ready = true
                clientInfo.SocketFile = socketFile
        }
        return cmdclient.IsSocketUnresponsive(socketFile), true, nil
}

func (c *VirtualMachineController) getLauncherClient(vmi *v1.VirtualMachineInstance) (cmdclient.LauncherClient, error) {
        var err error

        clientInfo, exists := c.launcherClients.Load(vmi.UID)
        if exists && clientInfo.Client != nil {
                return clientInfo.Client, nil
        }

        socketFile, err := cmdclient.FindSocketOnHost(vmi)
        if err != nil {
                return nil, err
        }

        err = virtcache.AddGhostRecord(vmi.Namespace, vmi.Name, socketFile, vmi.UID)
        if err != nil {
                return nil, err
        }

        client, err := cmdclient.NewClient(socketFile)
        if err != nil {
                return nil, err
        }

        domainPipeStopChan := make(chan struct{})
        //we pipe in the domain socket into the VMI's filesystem
        err = c.startDomainNotifyPipe(domainPipeStopChan, vmi)
        if err != nil {
                client.Close()
                close(domainPipeStopChan)
                return nil, err
        }

        c.launcherClients.Store(vmi.UID, &virtcache.LauncherClientInfo{
                Client:              client,
                SocketFile:          socketFile,
                DomainPipeStopChan:  domainPipeStopChan,
                NotInitializedSince: time.Now(),
                Ready:               true,
        })

        return client, nil
}

func (c *VirtualMachineController) processVmDestroy(vmi *v1.VirtualMachineInstance, domain *api.Domain) error {
        tryGracefully := false
        return c.helperVmShutdown(vmi, domain, tryGracefully)
}

func (c *VirtualMachineController) processVmShutdown(vmi *v1.VirtualMachineInstance, domain *api.Domain) error {
        tryGracefully := true
        return c.helperVmShutdown(vmi, domain, tryGracefully)
}

func (c *VirtualMachineController) helperVmShutdown(vmi *v1.VirtualMachineInstance, domain *api.Domain, tryGracefully bool) error {

        // Only attempt to shutdown/destroy if we still have a connection established with the pod.
        client, err := c.getVerifiedLauncherClient(vmi)
        if err != nil {
                return err
        }

        if domainHasGracePeriod(domain) && tryGracefully {
                if expired, timeLeft := c.hasGracePeriodExpired(domain); !expired {
                        return c.handleVMIShutdown(vmi, domain, client, timeLeft)
                }
                log.Log.Object(vmi).Infof("Grace period expired, killing deleted VirtualMachineInstance %s", vmi.GetObjectMeta().GetName())
        } else {
                log.Log.Object(vmi).Infof("Graceful shutdown not set, killing deleted VirtualMachineInstance %s", vmi.GetObjectMeta().GetName())
        }

        err = client.KillVirtualMachine(vmi)
        if err != nil && !cmdclient.IsDisconnected(err) {
                // Only report err if it wasn't the result of a disconnect.
                //
                // Both virt-launcher and virt-handler are trying to destroy
                // the VirtualMachineInstance at the same time. It's possible the client may get
                // disconnected during the kill request, which shouldn't be
                // considered an error.
                return err
        }

        c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.Deleted.String(), VMIStopping)

        return nil
}

func (c *VirtualMachineController) handleVMIShutdown(vmi *v1.VirtualMachineInstance, domain *api.Domain, client cmdclient.LauncherClient, timeLeft int64) error {
        if domain.Status.Status != api.Shutdown {
                return c.shutdownVMI(vmi, client, timeLeft)
        }
        log.Log.V(4).Object(vmi).Infof("%s is already shutting down.", vmi.GetObjectMeta().GetName())
        return nil
}

func (c *VirtualMachineController) shutdownVMI(vmi *v1.VirtualMachineInstance, client cmdclient.LauncherClient, timeLeft int64) error {
        err := client.ShutdownVirtualMachine(vmi)
        if err != nil && !cmdclient.IsDisconnected(err) {
                // Only report err if it wasn't the result of a disconnect.
                //
                // Both virt-launcher and virt-handler are trying to destroy
                // the VirtualMachineInstance at the same time. It's possible the client may get
                // disconnected during the kill request, which shouldn't be
                // considered an error.
                return err
        }

        log.Log.Object(vmi).Infof("Signaled graceful shutdown for %s", vmi.GetObjectMeta().GetName())

        // Make sure that we don't hot-loop in case we send the first domain notification
        if timeLeft == -1 {
                timeLeft = 5
                if vmi.Spec.TerminationGracePeriodSeconds != nil && *vmi.Spec.TerminationGracePeriodSeconds < timeLeft {
                        timeLeft = *vmi.Spec.TerminationGracePeriodSeconds
                }
        }
        // In case we have a long grace period, we want to resend the graceful shutdown every 5 seconds
        // That's important since a booting OS can miss ACPI signals
        if timeLeft > 5 {
                timeLeft = 5
        }

        // pending graceful shutdown.
        c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Duration(timeLeft)*time.Second)
        c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.ShuttingDown.String(), VMIGracefulShutdown)
        return nil
}

func (c *VirtualMachineController) processVmDelete(vmi *v1.VirtualMachineInstance) error {

        // Only attempt to shutdown/destroy if we still have a connection established with the pod.
        client, err := c.getVerifiedLauncherClient(vmi)

        // If the pod has been torn down, we know the VirtualMachineInstance is down.
        if err == nil {

                log.Log.Object(vmi).Infof("Signaled deletion for %s", vmi.GetObjectMeta().GetName())

                // pending deletion.
                c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.Deleted.String(), VMISignalDeletion)

                err = client.DeleteDomain(vmi)
                if err != nil && !cmdclient.IsDisconnected(err) {
                        // Only report err if it wasn't the result of a disconnect.
                        //
                        // Both virt-launcher and virt-handler are trying to destroy
                        // the VirtualMachineInstance at the same time. It's possible the client may get
                        // disconnected during the kill request, which shouldn't be
                        // considered an error.
                        return err
                }
        }

        return nil

}

func (c *VirtualMachineController) hasStaleClientConnections(vmi *v1.VirtualMachineInstance) bool {
        _, err := c.getVerifiedLauncherClient(vmi)
        if err == nil {
                // current client connection is good.
                return false
        }

        // no connection, but ghost file exists.
        if virtcache.HasGhostRecord(vmi.Namespace, vmi.Name) {
                return true
        }

        return false

}

func (c *VirtualMachineController) getVerifiedLauncherClient(vmi *v1.VirtualMachineInstance) (client cmdclient.LauncherClient, err error) {
        client, err = c.getLauncherClient(vmi)
        if err != nil {
                return
        }

        // Verify connectivity.
        // It's possible the pod has already been torn down along with the VirtualMachineInstance.
        err = client.Ping()
        return
}

func (c *VirtualMachineController) isOrphanedMigrationSource(vmi *v1.VirtualMachineInstance) bool {
        nodeName, ok := vmi.Labels[v1.NodeNameLabel]

        if ok && nodeName != "" && nodeName != c.host {
                return true
        }

        return false
}

func (c *VirtualMachineController) isPreMigrationTarget(vmi *v1.VirtualMachineInstance) bool {

        migrationTargetNodeName, ok := vmi.Labels[v1.MigrationTargetNodeNameLabel]

        if ok &&
                migrationTargetNodeName != "" &&
                migrationTargetNodeName != vmi.Status.NodeName &&
                migrationTargetNodeName == c.host {
                return true
        }

        return false
}

func (c *VirtualMachineController) checkNetworkInterfacesForMigration(vmi *v1.VirtualMachineInstance) error {
        return netvmispec.VerifyVMIMigratable(vmi, c.clusterConfig.GetNetworkBindings())
}

func (c *VirtualMachineController) checkVolumesForMigration(vmi *v1.VirtualMachineInstance) (blockMigrate bool, err error) {
        volumeStatusMap := make(map[string]v1.VolumeStatus)

        for _, volumeStatus := range vmi.Status.VolumeStatus {
                volumeStatusMap[volumeStatus.Name] = volumeStatus
        }

        if len(vmi.Status.MigratedVolumes) > 0 {
                blockMigrate = true
        }

        filesystems := storagetypes.GetFilesystemsFromVolumes(vmi)

        // Check if all VMI volumes can be shared between the source and the destination
        // of a live migration. blockMigrate will be returned as false, only if all volumes
        // are shared and the VMI has no local disks
        // Some combinations of disks makes the VMI no suitable for live migration.
        // A relevant error will be returned in this case.
        for _, volume := range vmi.Spec.Volumes {
                volSrc := volume.VolumeSource
                if volSrc.PersistentVolumeClaim != nil || volSrc.DataVolume != nil {

                        var claimName string
                        if volSrc.PersistentVolumeClaim != nil {
                                claimName = volSrc.PersistentVolumeClaim.ClaimName
                        } else {
                                claimName = volSrc.DataVolume.Name
                        }

                        volumeStatus, ok := volumeStatusMap[volume.Name]

                        if !ok || volumeStatus.PersistentVolumeClaimInfo == nil {
                                return true, fmt.Errorf("cannot migrate VMI: Unable to determine if PVC %v is shared, live migration requires that all PVCs must be shared (using ReadWriteMany access mode)", claimName)
                        } else if !pvctypes.HasSharedAccessMode(volumeStatus.PersistentVolumeClaimInfo.AccessModes) && !pvctypes.IsMigratedVolume(volumeStatus.Name, vmi) {
                                return true, fmt.Errorf("cannot migrate VMI: PVC %v is not shared, live migration requires that all PVCs must be shared (using ReadWriteMany access mode)", claimName)
                        }

                } else if volSrc.HostDisk != nil {
                        shared := volSrc.HostDisk.Shared != nil && *volSrc.HostDisk.Shared
                        if !shared {
                                return true, fmt.Errorf("cannot migrate VMI with non-shared HostDisk")
                        }
                } else {
                        if _, ok := filesystems[volume.Name]; ok {
                                log.Log.Object(vmi).Infof("Volume %s is shared with virtiofs, allow live migration", volume.Name)
                                continue
                        }

                        isVolumeUsedByReadOnlyDisk := false
                        for _, disk := range vmi.Spec.Domain.Devices.Disks {
                                if isReadOnlyDisk(&disk) && disk.Name == volume.Name {
                                        isVolumeUsedByReadOnlyDisk = true
                                        break
                                }
                        }

                        if isVolumeUsedByReadOnlyDisk {
                                continue
                        }

                        if vmi.Status.MigrationMethod == "" || vmi.Status.MigrationMethod == v1.LiveMigration {
                                log.Log.Object(vmi).Infof("migration is block migration because of %s volume", volume.Name)
                        }
                        blockMigrate = true
                }
        }
        return
}

func (c *VirtualMachineController) isVMIPausedDuringMigration(vmi *v1.VirtualMachineInstance) bool {
        return vmi.Status.MigrationState != nil &&
                vmi.Status.MigrationState.Mode == v1.MigrationPaused &&
                !vmi.Status.MigrationState.Completed
}

func (c *VirtualMachineController) isMigrationSource(vmi *v1.VirtualMachineInstance) bool {

        if vmi.Status.MigrationState != nil &&
                vmi.Status.MigrationState.SourceNode == c.host &&
                vmi.Status.MigrationState.TargetNodeAddress != "" &&
                !vmi.Status.MigrationState.Completed {

                return true
        }
        return false

}

func (c *VirtualMachineController) handleTargetMigrationProxy(vmi *v1.VirtualMachineInstance) error {
        // handle starting/stopping target migration proxy
        migrationTargetSockets := []string{}
        res, err := c.podIsolationDetector.Detect(vmi)
        if err != nil {
                return err
        }

        // Get the libvirt connection socket file on the destination pod.
        socketFile := fmt.Sprintf(filepath.Join(c.virtLauncherFSRunDirPattern, "libvirt/virtqemud-sock"), res.Pid())
        // the migration-proxy is no longer shared via host mount, so we
        // pass in the virt-launcher's baseDir to reach the unix sockets.
        baseDir := fmt.Sprintf(filepath.Join(c.virtLauncherFSRunDirPattern, "kubevirt"), res.Pid())
        migrationTargetSockets = append(migrationTargetSockets, socketFile)

        migrationPortsRange := migrationproxy.GetMigrationPortsList(vmi.IsBlockMigration())
        for _, port := range migrationPortsRange {
                key := migrationproxy.ConstructProxyKey(string(vmi.UID), port)
                // a proxy between the target direct qemu channel and the connector in the destination pod
                destSocketFile := migrationproxy.SourceUnixFile(baseDir, key)
                migrationTargetSockets = append(migrationTargetSockets, destSocketFile)
        }
        err = c.migrationProxy.StartTargetListener(string(vmi.UID), migrationTargetSockets)
        if err != nil {
                return err
        }
        return nil
}

func (c *VirtualMachineController) handlePostMigrationProxyCleanup(vmi *v1.VirtualMachineInstance) {
        if vmi.Status.MigrationState == nil || vmi.Status.MigrationState.Completed || vmi.Status.MigrationState.Failed {
                c.migrationProxy.StopTargetListener(string(vmi.UID))
                c.migrationProxy.StopSourceListener(string(vmi.UID))
        }
}

func (c *VirtualMachineController) handleSourceMigrationProxy(vmi *v1.VirtualMachineInstance) error {

        res, err := c.podIsolationDetector.Detect(vmi)
        if err != nil {
                return err
        }
        // the migration-proxy is no longer shared via host mount, so we
        // pass in the virt-launcher's baseDir to reach the unix sockets.
        baseDir := fmt.Sprintf(filepath.Join(c.virtLauncherFSRunDirPattern, "kubevirt"), res.Pid())
        c.migrationProxy.StopTargetListener(string(vmi.UID))
        if vmi.Status.MigrationState.TargetDirectMigrationNodePorts == nil {
                msg := "No migration proxy has been created for this vmi"
                return fmt.Errorf("%s", msg)
        }
        err = c.migrationProxy.StartSourceListener(
                string(vmi.UID),
                vmi.Status.MigrationState.TargetNodeAddress,
                vmi.Status.MigrationState.TargetDirectMigrationNodePorts,
                baseDir,
        )
        if err != nil {
                return err
        }

        return nil
}

func (c *VirtualMachineController) getLauncherClientInfo(vmi *v1.VirtualMachineInstance) *virtcache.LauncherClientInfo {
        launcherInfo, exists := c.launcherClients.Load(vmi.UID)
        if !exists {
                return nil
        }
        return launcherInfo
}

func isMigrationInProgress(vmi *v1.VirtualMachineInstance, domain *api.Domain) bool {
        var domainMigrationMetadata *api.MigrationMetadata

        if domain == nil ||
                vmi.Status.MigrationState == nil ||
                domain.Spec.Metadata.KubeVirt.Migration == nil {
                return false
        }
        domainMigrationMetadata = domain.Spec.Metadata.KubeVirt.Migration

        if vmi.Status.MigrationState.MigrationUID == domainMigrationMetadata.UID &&
                domainMigrationMetadata.StartTimestamp != nil {
                return true
        }
        return false
}

func (c *VirtualMachineController) vmUpdateHelperMigrationSource(origVMI *v1.VirtualMachineInstance, domain *api.Domain) error {

        client, err := c.getLauncherClient(origVMI)
        if err != nil {
                return fmt.Errorf(unableCreateVirtLauncherConnectionFmt, err)
        }

        if origVMI.Status.MigrationState.AbortRequested {
                err = c.handleMigrationAbort(origVMI, client)
                if err != nil {
                        return err
                }
        } else {
                if isMigrationInProgress(origVMI, domain) {
                        // we already started this migration, no need to rerun this
                        log.DefaultLogger().Errorf("migration %s has already been started", origVMI.Status.MigrationState.MigrationUID)
                        return nil
                }

                err = c.handleSourceMigrationProxy(origVMI)
                if err != nil {
                        return fmt.Errorf("failed to handle migration proxy: %v", err)
                }

                migrationConfiguration := origVMI.Status.MigrationState.MigrationConfiguration
                if migrationConfiguration == nil {
                        migrationConfiguration = c.clusterConfig.GetMigrationConfiguration()
                }

                options := &cmdclient.MigrationOptions{
                        Bandwidth:               *migrationConfiguration.BandwidthPerMigration,
                        ProgressTimeout:         *migrationConfiguration.ProgressTimeout,
                        CompletionTimeoutPerGiB: *migrationConfiguration.CompletionTimeoutPerGiB,
                        UnsafeMigration:         *migrationConfiguration.UnsafeMigrationOverride,
                        AllowAutoConverge:       *migrationConfiguration.AllowAutoConverge,
                        AllowPostCopy:           *migrationConfiguration.AllowPostCopy,
                        AllowWorkloadDisruption: *migrationConfiguration.AllowWorkloadDisruption,
                }

                configureParallelMigrationThreads(options, origVMI)

                marshalledOptions, err := json.Marshal(options)
                if err != nil {
                        log.Log.Object(origVMI).Warning("failed to marshall matched migration options")
                } else {
                        log.Log.Object(origVMI).Infof("migration options matched for vmi %s: %s", origVMI.Name, string(marshalledOptions))
                }

                vmi := origVMI.DeepCopy()
                err = hostdisk.ReplacePVCByHostDisk(vmi)
                if err != nil {
                        return err
                }

                err = client.MigrateVirtualMachine(vmi, options)
                if err != nil {
                        return err
                }
                c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.Migrating.String(), VMIMigrating)
        }
        return nil
}

func replaceMigratedVolumesStatus(vmi *v1.VirtualMachineInstance) {
        replaceVolsStatus := make(map[string]*v1.PersistentVolumeClaimInfo)
        for _, v := range vmi.Status.MigratedVolumes {
                replaceVolsStatus[v.SourcePVCInfo.ClaimName] = v.DestinationPVCInfo
        }
        for i, v := range vmi.Status.VolumeStatus {
                if v.PersistentVolumeClaimInfo == nil {
                        continue
                }
                if status, ok := replaceVolsStatus[v.PersistentVolumeClaimInfo.ClaimName]; ok {
                        vmi.Status.VolumeStatus[i].PersistentVolumeClaimInfo = status
                }
        }

}

func (c *VirtualMachineController) vmUpdateHelperMigrationTarget(origVMI *v1.VirtualMachineInstance) error {
        client, err := c.getLauncherClient(origVMI)
        if err != nil {
                return fmt.Errorf(unableCreateVirtLauncherConnectionFmt, err)
        }

        vmi := origVMI.DeepCopy()

        if migrations.MigrationFailed(vmi) {
                // if the migration failed, signal the target pod it's okay to exit
                err = client.SignalTargetPodCleanup(vmi)
                if err != nil {
                        return err
                }
                log.Log.Object(vmi).Infof("Signaled target pod for failed migration to clean up")
                // nothing left to do here if the migration failed.
                // Re-enqueue to trigger handler final cleanup
                c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Second)
                return nil
        } else if migrations.IsMigrating(vmi) {
                // If the migration has already started,
                // then there's nothing left to prepare on the target side
                return nil
        }
        // The VolumeStatus is used to retrive additional information for the volume handling.
        // For example, for filesystem PVC, the information are used to create a right size image.
        // In the case of migrated volumes, we need to replace the original volume information with the
        // destination volume properties.
        replaceMigratedVolumesStatus(vmi)
        err = hostdisk.ReplacePVCByHostDisk(vmi)
        if err != nil {
                return err
        }

        // give containerDisks some time to become ready before throwing errors on retries
        info := c.getLauncherClientInfo(vmi)
        if ready, err := c.containerDiskMounter.ContainerDisksReady(vmi, info.NotInitializedSince); !ready {
                if err != nil {
                        return err
                }
                c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Second*1)
                return nil
        }

        // Verify container disks checksum
        err = container_disk.VerifyChecksums(c.containerDiskMounter, vmi)
        switch {
        case goerror.Is(err, container_disk.ErrChecksumMissing):
                // wait for checksum to be computed by the source virt-handler
                return err
        case goerror.Is(err, container_disk.ErrChecksumMismatch):
                log.Log.Object(vmi).Infof("Containerdisk checksum mismatch, terminating target pod: %s", err)
                c.recorder.Event(vmi, k8sv1.EventTypeNormal, "ContainerDiskFailedChecksum", "Aborting migration as the source and target containerdisks/kernelboot do not match")
                return client.SignalTargetPodCleanup(vmi)
        case err != nil:
                return err
        }

        // Mount container disks
        disksInfo, err := c.containerDiskMounter.MountAndVerify(vmi)
        if err != nil {
                return err
        }

        // Mount hotplug disks
        if attachmentPodUID := vmi.Status.MigrationState.TargetAttachmentPodUID; attachmentPodUID != types.UID("") {
                cgroupManager, err := getCgroupManager(vmi)
                if err != nil {
                        return err
                }
                if err := c.hotplugVolumeMounter.MountFromPod(vmi, attachmentPodUID, cgroupManager); err != nil {
                        return fmt.Errorf("failed to mount hotplug volumes: %v", err)
                }
        }

        // configure network inside virt-launcher compute container
        if err := c.setupNetwork(vmi, netsetup.FilterNetsForMigrationTarget(vmi)); err != nil {
                return fmt.Errorf("failed to configure vmi network for migration target: %w", err)
        }

        isolationRes, err := c.podIsolationDetector.Detect(vmi)
        if err != nil {
                return fmt.Errorf(failedDetectIsolationFmt, err)
        }
        virtLauncherRootMount, err := isolationRes.MountRoot()
        if err != nil {
                return err
        }

        err = c.claimDeviceOwnership(virtLauncherRootMount, "kvm")
        if err != nil {
                return fmt.Errorf("failed to set up file ownership for /dev/kvm: %v", err)
        }
        if virtutil.IsAutoAttachVSOCK(vmi) {
                if err := c.claimDeviceOwnership(virtLauncherRootMount, "vhost-vsock"); err != nil {
                        return fmt.Errorf("failed to set up file ownership for /dev/vhost-vsock: %v", err)
                }
        }

        lessPVCSpaceToleration := c.clusterConfig.GetLessPVCSpaceToleration()
        minimumPVCReserveBytes := c.clusterConfig.GetMinimumReservePVCBytes()

        // initialize disks images for empty PVC
        hostDiskCreator := hostdisk.NewHostDiskCreator(c.recorder, lessPVCSpaceToleration, minimumPVCReserveBytes, virtLauncherRootMount)
        err = hostDiskCreator.Create(vmi)
        if err != nil {
                return fmt.Errorf("preparing host-disks failed: %v", err)
        }

        if virtutil.IsNonRootVMI(vmi) {
                if err := c.nonRootSetup(origVMI); err != nil {
                        return err
                }
        }

        options := virtualMachineOptions(nil, 0, nil, c.capabilities, disksInfo, c.clusterConfig)
        options.InterfaceDomainAttachment = domainspec.DomainAttachmentByInterfaceName(vmi.Spec.Domain.Devices.Interfaces, c.clusterConfig.GetNetworkBindings())

        if err := client.SyncMigrationTarget(vmi, options); err != nil {
                return fmt.Errorf("syncing migration target failed: %v", err)
        }
        c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.PreparingTarget.String(), VMIMigrationTargetPrepared)

        err = c.handleTargetMigrationProxy(vmi)
        if err != nil {
                return fmt.Errorf("failed to handle post sync migration proxy: %v", err)
        }
        return nil
}

func (c *VirtualMachineController) affinePitThread(vmi *v1.VirtualMachineInstance) error {
        res, err := c.podIsolationDetector.Detect(vmi)
        if err != nil {
                return err
        }
        var Mask unix.CPUSet
        Mask.Zero()
        qemuprocess, err := res.GetQEMUProcess()
        if err != nil {
                return err
        }
        qemupid := qemuprocess.Pid()
        if qemupid == -1 {
                return nil
        }

        pitpid, err := res.KvmPitPid()
        if err != nil {
                return err
        }
        if pitpid == -1 {
                return nil
        }
        if vmi.IsRealtimeEnabled() {
                param := schedParam{priority: 2}
                err = schedSetScheduler(pitpid, schedFIFO, param)
                if err != nil {
                        return fmt.Errorf("failed to set FIFO scheduling and priority 2 for thread %d: %w", pitpid, err)
                }
        }
        vcpus, err := getVCPUThreadIDs(qemupid)
        if err != nil {
                return err
        }
        vpid, ok := vcpus["0"]
        if ok == false {
                return nil
        }
        vcpupid, err := strconv.Atoi(vpid)
        if err != nil {
                return err
        }
        err = unix.SchedGetaffinity(vcpupid, &Mask)
        if err != nil {
                return err
        }
        return unix.SchedSetaffinity(pitpid, &Mask)
}

func (c *VirtualMachineController) configureHousekeepingCgroup(vmi *v1.VirtualMachineInstance, cgroupManager cgroup.Manager) error {
        if err := cgroupManager.CreateChildCgroup("housekeeping", "cpuset"); err != nil {
                log.Log.Reason(err).Error("CreateChildCgroup ")
                return err
        }

        key := controller.VirtualMachineInstanceKey(vmi)
        domain, domainExists, _, err := c.getDomainFromCache(key)
        if err != nil {
                return err
        }
        // bail out if domain does not exist
        if domainExists == false {
                return nil
        }

        if domain.Spec.CPUTune == nil || domain.Spec.CPUTune.EmulatorPin == nil {
                return nil
        }

        hkcpus, err := hardware.ParseCPUSetLine(domain.Spec.CPUTune.EmulatorPin.CPUSet, 100)
        if err != nil {
                return err
        }

        log.Log.V(3).Object(vmi).Infof("housekeeping cpu: %v", hkcpus)

        err = cgroupManager.SetCpuSet("housekeeping", hkcpus)
        if err != nil {
                return err
        }

        tids, err := cgroupManager.GetCgroupThreads()
        if err != nil {
                return err
        }
        hktids := make([]int, 0, 10)

        for _, tid := range tids {
                proc, err := ps.FindProcess(tid)
                if err != nil {
                        log.Log.Object(vmi).Errorf("Failure to find process: %s", err.Error())
                        return err
                }
                if proc == nil {
                        return fmt.Errorf("failed to find process with tid: %d", tid)
                }
                comm := proc.Executable()
                if strings.Contains(comm, "CPU ") && strings.Contains(comm, "KVM") {
                        continue
                }
                hktids = append(hktids, tid)
        }

        log.Log.V(3).Object(vmi).Infof("hk thread ids: %v", hktids)
        for _, tid := range hktids {
                err = cgroupManager.AttachTID("cpuset", "housekeeping", tid)
                if err != nil {
                        log.Log.Object(vmi).Errorf("Error attaching tid %d: %v", tid, err.Error())
                        return err
                }
        }

        return nil
}

func (c *VirtualMachineController) vmUpdateHelperDefault(origVMI *v1.VirtualMachineInstance, domainExists bool) error {
        client, err := c.getLauncherClient(origVMI)
        if err != nil {
                return fmt.Errorf(unableCreateVirtLauncherConnectionFmt, err)
        }

        vmi := origVMI.DeepCopy()
        // Find preallocated volumes
        var preallocatedVolumes []string
        for _, volumeStatus := range vmi.Status.VolumeStatus {
                if volumeStatus.PersistentVolumeClaimInfo != nil && volumeStatus.PersistentVolumeClaimInfo.Preallocated {
                        preallocatedVolumes = append(preallocatedVolumes, volumeStatus.Name)
                }
        }

        err = hostdisk.ReplacePVCByHostDisk(vmi)
        if err != nil {
                return err
        }

        cgroupManager, err := getCgroupManager(vmi)
        if err != nil {
                return err
        }
        var errorTolerantFeaturesError []error
        disksInfo := map[string]*containerdisk.DiskInfo{}
        if !vmi.IsRunning() && !vmi.IsFinal() {
                // give containerDisks some time to become ready before throwing errors on retries
                info := c.getLauncherClientInfo(vmi)
                if ready, err := c.containerDiskMounter.ContainerDisksReady(vmi, info.NotInitializedSince); !ready {
                        if err != nil {
                                return err
                        }
                        c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Second*1)
                        return nil
                }

                disksInfo, err = c.containerDiskMounter.MountAndVerify(vmi)
                if err != nil {
                        return err
                }

                // Try to mount hotplug volume if there is any during startup.
                if err := c.hotplugVolumeMounter.Mount(vmi, cgroupManager); err != nil {
                        return err
                }

                if err := c.setupNetwork(vmi, netsetup.FilterNetsForVMStartup(vmi)); err != nil {
                        return fmt.Errorf("failed to configure vmi network: %w", err)
                }

                isolationRes, err := c.podIsolationDetector.Detect(vmi)
                if err != nil {
                        return fmt.Errorf(failedDetectIsolationFmt, err)
                }
                virtLauncherRootMount, err := isolationRes.MountRoot()
                if err != nil {
                        return err
                }

                err = c.claimDeviceOwnership(virtLauncherRootMount, "kvm")
                if err != nil {
                        return fmt.Errorf("failed to set up file ownership for /dev/kvm: %v", err)
                }
                if virtutil.IsAutoAttachVSOCK(vmi) {
                        if err := c.claimDeviceOwnership(virtLauncherRootMount, "vhost-vsock"); err != nil {
                                return fmt.Errorf("failed to set up file ownership for /dev/vhost-vsock: %v", err)
                        }
                }

                lessPVCSpaceToleration := c.clusterConfig.GetLessPVCSpaceToleration()
                minimumPVCReserveBytes := c.clusterConfig.GetMinimumReservePVCBytes()

                // initialize disks images for empty PVC
                hostDiskCreator := hostdisk.NewHostDiskCreator(c.recorder, lessPVCSpaceToleration, minimumPVCReserveBytes, virtLauncherRootMount)
                err = hostDiskCreator.Create(vmi)
                if err != nil {
                        return fmt.Errorf("preparing host-disks failed: %v", err)
                }

                if virtutil.IsSEVVMI(vmi) {
                        sevDevice, err := safepath.JoinNoFollow(virtLauncherRootMount, filepath.Join("dev", "sev"))
                        if err != nil {
                                return err
                        }
                        if err := diskutils.DefaultOwnershipManager.SetFileOwnership(sevDevice); err != nil {
                                return fmt.Errorf("failed to set SEV device owner: %v", err)
                        }
                }

                if virtutil.IsNonRootVMI(vmi) {
                        if err := c.nonRootSetup(origVMI); err != nil {
                                return err
                        }
                }
                for _, fs := range vmi.Spec.Domain.Devices.Filesystems {
                        socketPath, err := isolation.SafeJoin(isolationRes, virtiofs.VirtioFSSocketPath(fs.Name))
                        if err != nil {
                                return err
                        }
                        if err := diskutils.DefaultOwnershipManager.SetFileOwnership(socketPath); err != nil {
                                return err
                        }
                }

                // set runtime limits as needed
                err = c.podIsolationDetector.AdjustResources(vmi, c.clusterConfig.GetConfig().AdditionalGuestMemoryOverheadRatio)
                if err != nil {
                        return fmt.Errorf("failed to adjust resources: %v", err)
                }

                if util.IsSEVAttestationRequested(vmi) {
                        sev := vmi.Spec.Domain.LaunchSecurity.SEV
                        if sev.Session == "" || sev.DHCert == "" {
                                // Wait for the session parameters to be provided
                                return nil
                        }
                }
        } else if vmi.IsRunning() {
                if err := c.hotplugSriovInterfaces(vmi); err != nil {
                        log.Log.Object(vmi).Error(err.Error())
                }

                if err := c.hotplugVolumeMounter.Mount(vmi, cgroupManager); err != nil {
                        return err
                }

                if err := c.getMemoryDump(vmi); err != nil {
                        return err
                }

                isolationRes, err := c.podIsolationDetector.Detect(vmi)
                if err != nil {
                        return fmt.Errorf(failedDetectIsolationFmt, err)
                }

                if err := c.downwardMetricsManager.StartServer(vmi, isolationRes.Pid()); err != nil {
                        return err
                }

                if err := c.setupNetwork(vmi, netsetup.FilterNetsForLiveUpdate(vmi)); err != nil {
                        log.Log.Object(vmi).Error(err.Error())
                        c.recorder.Event(vmi, k8sv1.EventTypeWarning, "NicHotplug", err.Error())
                        errorTolerantFeaturesError = append(errorTolerantFeaturesError, err)
                }
        }

        smbios := c.clusterConfig.GetSMBIOS()
        period := c.clusterConfig.GetMemBalloonStatsPeriod()

        options := virtualMachineOptions(smbios, period, preallocatedVolumes, c.capabilities, disksInfo, c.clusterConfig)
        options.InterfaceDomainAttachment = domainspec.DomainAttachmentByInterfaceName(vmi.Spec.Domain.Devices.Interfaces, c.clusterConfig.GetNetworkBindings())

        err = client.SyncVirtualMachine(vmi, options)
        if err != nil {
                isSecbootError := strings.Contains(err.Error(), "EFI OVMF rom missing")
                if isSecbootError {
                        return &virtLauncherCriticalSecurebootError{fmt.Sprintf("mismatch of Secure Boot setting and bootloaders: %v", err)}
                }
                return err
        }

        if vmi.IsCPUDedicated() && vmi.Spec.Domain.CPU.IsolateEmulatorThread {
                err = c.configureHousekeepingCgroup(vmi, cgroupManager)
                if err != nil {
                        return err
                }
        }
        if vmi.IsRealtimeEnabled() && !vmi.IsRunning() && !vmi.IsFinal() {
                log.Log.Object(vmi).Info("Configuring vcpus for real time workloads")
                if err := c.configureVCPUScheduler(vmi); err != nil {
                        return err
                }
        }
        if vmi.IsCPUDedicated() && !vmi.IsRunning() && !vmi.IsFinal() {
                log.Log.V(3).Object(vmi).Info("Affining PIT thread")
                if err := c.affinePitThread(vmi); err != nil {
                        return err
                }
        }
        if !domainExists {
                c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.Created.String(), VMIDefined)
        }

        if vmi.IsRunning() {
                // Umount any disks no longer mounted
                if err := c.hotplugVolumeMounter.Unmount(vmi, cgroupManager); err != nil {
                        return err
                }
        }
        return errors.NewAggregate(errorTolerantFeaturesError)
}

func (c *VirtualMachineController) hotplugSriovInterfaces(vmi *v1.VirtualMachineInstance) error {
        sriovSpecInterfaces := netvmispec.FilterSRIOVInterfaces(vmi.Spec.Domain.Devices.Interfaces)

        sriovSpecIfacesNames := netvmispec.IndexInterfaceSpecByName(sriovSpecInterfaces)
        attachedSriovStatusIfaces := netvmispec.IndexInterfaceStatusByName(vmi.Status.Interfaces, func(iface v1.VirtualMachineInstanceNetworkInterface) bool {
                _, exist := sriovSpecIfacesNames[iface.Name]
                return exist && netvmispec.ContainsInfoSource(iface.InfoSource, netvmispec.InfoSourceDomain) &&
                        netvmispec.ContainsInfoSource(iface.InfoSource, netvmispec.InfoSourceMultusStatus)
        })

        desiredSriovMultusPluggedIfaces := netvmispec.IndexInterfaceStatusByName(vmi.Status.Interfaces, func(iface v1.VirtualMachineInstanceNetworkInterface) bool {
                _, exist := sriovSpecIfacesNames[iface.Name]
                return exist && netvmispec.ContainsInfoSource(iface.InfoSource, netvmispec.InfoSourceMultusStatus)
        })

        if len(desiredSriovMultusPluggedIfaces) == len(attachedSriovStatusIfaces) {
                c.sriovHotplugExecutorPool.Delete(vmi.UID)
                return nil
        }

        rateLimitedExecutor := c.sriovHotplugExecutorPool.LoadOrStore(vmi.UID)
        return rateLimitedExecutor.Exec(func() error {
                return c.hotplugSriovInterfacesCommand(vmi)
        })
}

func (c *VirtualMachineController) hotplugSriovInterfacesCommand(vmi *v1.VirtualMachineInstance) error {
        const errMsgPrefix = "failed to hot-plug SR-IOV interfaces"

        client, err := c.getVerifiedLauncherClient(vmi)
        if err != nil {
                return fmt.Errorf("%s: %v", errMsgPrefix, err)
        }

        if err := isolation.AdjustQemuProcessMemoryLimits(c.podIsolationDetector, vmi, c.clusterConfig.GetConfig().AdditionalGuestMemoryOverheadRatio); err != nil {
                c.recorder.Event(vmi, k8sv1.EventTypeWarning, err.Error(), err.Error())
                return fmt.Errorf("%s: %v", errMsgPrefix, err)
        }

        log.Log.V(3).Object(vmi).Info("sending hot-plug host-devices command")
        if err := client.HotplugHostDevices(vmi); err != nil {
                return fmt.Errorf("%s: %v", errMsgPrefix, err)
        }

        return nil
}

func memoryDumpPath(volumeStatus v1.VolumeStatus) string {
        target := hotplugdisk.GetVolumeMountDir(volumeStatus.Name)
        dumpPath := filepath.Join(target, volumeStatus.MemoryDumpVolume.TargetFileName)
        return dumpPath
}

func (c *VirtualMachineController) getMemoryDump(vmi *v1.VirtualMachineInstance) error {
        const errMsgPrefix = "failed to getting memory dump"

        for _, volumeStatus := range vmi.Status.VolumeStatus {
                if volumeStatus.MemoryDumpVolume == nil || volumeStatus.Phase != v1.MemoryDumpVolumeInProgress {
                        continue
                }
                client, err := c.getVerifiedLauncherClient(vmi)
                if err != nil {
                        return fmt.Errorf("%s: %v", errMsgPrefix, err)
                }

                log.Log.V(3).Object(vmi).Info("sending memory dump command")
                err = client.VirtualMachineMemoryDump(vmi, memoryDumpPath(volumeStatus))
                if err != nil {
                        return fmt.Errorf("%s: %v", errMsgPrefix, err)
                }
        }

        return nil
}

func (c *VirtualMachineController) processVmUpdate(vmi *v1.VirtualMachineInstance, domain *api.Domain) error {

        isUnresponsive, isInitialized, err := c.isLauncherClientUnresponsive(vmi)
        if err != nil {
                return err
        }
        if !isInitialized {
                c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Second*1)
                return nil
        } else if isUnresponsive {
                return goerror.New(fmt.Sprintf("Can not update a VirtualMachineInstance with unresponsive command server."))
        }

        c.handlePostMigrationProxyCleanup(vmi)

        if c.isPreMigrationTarget(vmi) {
                return c.vmUpdateHelperMigrationTarget(vmi)
        } else if c.isMigrationSource(vmi) {
                return c.vmUpdateHelperMigrationSource(vmi, domain)
        } else {
                return c.vmUpdateHelperDefault(vmi, domain != nil)
        }
}

func (c *VirtualMachineController) setVmPhaseForStatusReason(domain *api.Domain, vmi *v1.VirtualMachineInstance) error {
        phase, err := c.calculateVmPhaseForStatusReason(domain, vmi)
        if err != nil {
                return err
        }
        vmi.Status.Phase = phase
        return nil
}
func (c *VirtualMachineController) calculateVmPhaseForStatusReason(domain *api.Domain, vmi *v1.VirtualMachineInstance) (v1.VirtualMachineInstancePhase, error) {

        if domain == nil {
                switch {
                case vmi.IsScheduled():
                        isUnresponsive, isInitialized, err := c.isLauncherClientUnresponsive(vmi)

                        if err != nil {
                                return vmi.Status.Phase, err
                        }
                        if !isInitialized {
                                c.queue.AddAfter(controller.VirtualMachineInstanceKey(vmi), time.Second*1)
                                return vmi.Status.Phase, err
                        } else if isUnresponsive {
                                // virt-launcher is gone and VirtualMachineInstance never transitioned
                                // from scheduled to Running.
                                return v1.Failed, nil
                        }
                        return v1.Scheduled, nil
                case !vmi.IsRunning() && !vmi.IsFinal():
                        return v1.Scheduled, nil
                case !vmi.IsFinal():
                        // That is unexpected. We should not be able to delete a VirtualMachineInstance before we stop it.
                        // However, if someone directly interacts with libvirt it is possible
                        return v1.Failed, nil
                }
        } else {

                switch domain.Status.Status {
                case api.Shutoff, api.Crashed:
                        switch domain.Status.Reason {
                        case api.ReasonCrashed, api.ReasonPanicked:
                                return v1.Failed, nil
                        case api.ReasonDestroyed:
                                // When ACPI is available, the domain was tried to be shutdown,
                                // and destroyed means that the domain was destroyed after the graceperiod expired.
                                // Without ACPI a destroyed domain is ok.
                                if isACPIEnabled(vmi, domain) {
                                        return v1.Failed, nil
                                }
                                return v1.Succeeded, nil
                        case api.ReasonShutdown, api.ReasonSaved, api.ReasonFromSnapshot:
                                return v1.Succeeded, nil
                        case api.ReasonMigrated:
                                // if the domain migrated, we no longer know the phase.
                                return vmi.Status.Phase, nil
                        }
                case api.Running, api.Paused, api.Blocked, api.PMSuspended:
                        return v1.Running, nil
                }
        }
        return vmi.Status.Phase, nil
}

func (c *VirtualMachineController) addFunc(obj interface{}) {
        key, err := controller.KeyFunc(obj)
        if err == nil {
                c.vmiExpectations.LowerExpectations(key, 1, 0)
                c.queue.Add(key)
        }
}
func (c *VirtualMachineController) deleteFunc(obj interface{}) {
        key, err := controller.KeyFunc(obj)
        if err == nil {
                c.vmiExpectations.LowerExpectations(key, 1, 0)
                c.queue.Add(key)
        }
}
func (c *VirtualMachineController) updateFunc(_, new interface{}) {
        key, err := controller.KeyFunc(new)
        if err == nil {
                c.vmiExpectations.LowerExpectations(key, 1, 0)
                c.queue.Add(key)
        }
}

func (c *VirtualMachineController) addDomainFunc(obj interface{}) {
        domain := obj.(*api.Domain)
        log.Log.Object(domain).Infof("Domain is in state %s reason %s", domain.Status.Status, domain.Status.Reason)
        key, err := controller.KeyFunc(obj)
        if err == nil {
                c.queue.Add(key)
        }
}
func (c *VirtualMachineController) deleteDomainFunc(obj interface{}) {
        domain, ok := obj.(*api.Domain)
        if !ok {
                tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
                if !ok {
                        log.Log.Reason(fmt.Errorf("couldn't get object from tombstone %+v", obj)).Error("Failed to process delete notification")
                        return
                }
                domain, ok = tombstone.Obj.(*api.Domain)
                if !ok {
                        log.Log.Reason(fmt.Errorf("tombstone contained object that is not a domain %#v", obj)).Error("Failed to process delete notification")
                        return
                }
        }
        log.Log.Object(domain).Info("Domain deleted")
        key, err := controller.KeyFunc(obj)
        if err == nil {
                c.queue.Add(key)
        }
}
func (c *VirtualMachineController) updateDomainFunc(old, new interface{}) {
        newDomain := new.(*api.Domain)
        oldDomain := old.(*api.Domain)
        if oldDomain.Status.Status != newDomain.Status.Status || oldDomain.Status.Reason != newDomain.Status.Reason {
                log.Log.Object(newDomain).Infof("Domain is in state %s reason %s", newDomain.Status.Status, newDomain.Status.Reason)
        }

        if newDomain.ObjectMeta.DeletionTimestamp != nil {
                log.Log.Object(newDomain).Info("Domain is marked for deletion")
        }

        key, err := controller.KeyFunc(new)
        if err == nil {
                c.queue.Add(key)
        }
}

func (c *VirtualMachineController) finalizeMigration(vmi *v1.VirtualMachineInstance) error {
        const errorMessage = "failed to finalize migration"

        client, err := c.getVerifiedLauncherClient(vmi)
        if err != nil {
                return fmt.Errorf("%s: %v", errorMessage, err)
        }

        if err := c.hotplugCPU(vmi, client); err != nil {
                log.Log.Object(vmi).Reason(err).Error(errorMessage)
                c.recorder.Event(vmi, k8sv1.EventTypeWarning, err.Error(), "failed to change vCPUs")
        }

        if err := c.hotplugMemory(vmi, client); err != nil {
                log.Log.Object(vmi).Reason(err).Error(errorMessage)
                c.recorder.Event(vmi, k8sv1.EventTypeWarning, err.Error(), "failed to update guest memory")
        }
        removeMigratedVolumes(vmi)

        options := &cmdv1.VirtualMachineOptions{}
        options.InterfaceMigration = domainspec.BindingMigrationByInterfaceName(vmi.Spec.Domain.Devices.Interfaces, c.clusterConfig.GetNetworkBindings())
        if err := client.FinalizeVirtualMachineMigration(vmi, options); err != nil {
                log.Log.Object(vmi).Reason(err).Error(errorMessage)
                return fmt.Errorf("%s: %v", errorMessage, err)
        }

        return nil
}

func vmiHasTerminationGracePeriod(vmi *v1.VirtualMachineInstance) bool {
        // if not set we use the default graceperiod
        return vmi.Spec.TerminationGracePeriodSeconds == nil ||
                (vmi.Spec.TerminationGracePeriodSeconds != nil && *vmi.Spec.TerminationGracePeriodSeconds != 0)
}

func domainHasGracePeriod(domain *api.Domain) bool {
        return domain != nil &&
                domain.Spec.Metadata.KubeVirt.GracePeriod != nil &&
                domain.Spec.Metadata.KubeVirt.GracePeriod.DeletionGracePeriodSeconds != 0
}

func isACPIEnabled(vmi *v1.VirtualMachineInstance, domain *api.Domain) bool {
        return (vmiHasTerminationGracePeriod(vmi) || (vmi.Spec.TerminationGracePeriodSeconds == nil && domainHasGracePeriod(domain))) &&
                domain != nil &&
                domain.Spec.Features != nil &&
                domain.Spec.Features.ACPI != nil
}

func (c *VirtualMachineController) isHostModelMigratable(vmi *v1.VirtualMachineInstance) error {
        if cpu := vmi.Spec.Domain.CPU; cpu != nil && cpu.Model == v1.CPUModeHostModel {
                if c.hostCpuModel == "" {
                        err := fmt.Errorf("the node \"%s\" does not allow migration with host-model", vmi.Status.NodeName)
                        log.Log.Object(vmi).Errorf(err.Error())
                        return err
                }
        }
        return nil
}

func (c *VirtualMachineController) claimDeviceOwnership(virtLauncherRootMount *safepath.Path, deviceName string) error {
        softwareEmulation := c.clusterConfig.AllowEmulation()
        devicePath, err := safepath.JoinNoFollow(virtLauncherRootMount, filepath.Join("dev", deviceName))
        if err != nil {
                if softwareEmulation {
                        return nil
                }
                return err
        }

        return diskutils.DefaultOwnershipManager.SetFileOwnership(devicePath)
}

func (c *VirtualMachineController) reportDedicatedCPUSetForMigratingVMI(vmi *v1.VirtualMachineInstance) error {
        cgroupManager, err := getCgroupManager(vmi)
        if err != nil {
                return err
        }

        cpusetStr, err := cgroupManager.GetCpuSet()
        if err != nil {
                return err
        }

        cpuSet, err := hardware.ParseCPUSetLine(cpusetStr, 50000)
        if err != nil {
                return fmt.Errorf("failed to parse target VMI cpuset: %v", err)
        }

        vmi.Status.MigrationState.TargetCPUSet = cpuSet

        return nil
}

func (c *VirtualMachineController) reportTargetTopologyForMigratingVMI(vmi *v1.VirtualMachineInstance) error {
        options := virtualMachineOptions(nil, 0, nil, c.capabilities, map[string]*containerdisk.DiskInfo{}, c.clusterConfig)
        topology, err := json.Marshal(options.Topology)
        if err != nil {
                return err
        }
        vmi.Status.MigrationState.TargetNodeTopology = string(topology)
        return nil
}

func (c *VirtualMachineController) handleMigrationAbort(vmi *v1.VirtualMachineInstance, client cmdclient.LauncherClient) error {
        if vmi.Status.MigrationState.AbortStatus == v1.MigrationAbortInProgress {
                return nil
        }

        err := client.CancelVirtualMachineMigration(vmi)
        if err != nil && err.Error() == migrations.CancelMigrationFailedVmiNotMigratingErr {
                // If migration did not even start there is no need to cancel it
                log.Log.Object(vmi).Infof("skipping migration cancellation since vmi is not migrating")
                return err
        }

        c.recorder.Event(vmi, k8sv1.EventTypeNormal, v1.Migrating.String(), VMIAbortingMigration)
        return nil
}

func isIOError(shouldUpdate, domainExists bool, domain *api.Domain) bool {
        return shouldUpdate && domainExists && domain.Status.Status == api.Paused && domain.Status.Reason == api.ReasonPausedIOError
}

func (c *VirtualMachineController) updateMachineType(vmi *v1.VirtualMachineInstance, domain *api.Domain) {
        if domain == nil || vmi == nil {
                return
        }
        if domain.Spec.OS.Type.Machine != "" {
                vmi.Status.Machine = &v1.Machine{Type: domain.Spec.OS.Type.Machine}
        }
}

func (c *VirtualMachineController) hotplugCPU(vmi *v1.VirtualMachineInstance, client cmdclient.LauncherClient) error {
        vmiConditions := controller.NewVirtualMachineInstanceConditionManager()

        removeVMIVCPUChangeConditionAndLabel := func() {
                delete(vmi.Labels, v1.VirtualMachinePodCPULimitsLabel)
                vmiConditions.RemoveCondition(vmi, v1.VirtualMachineInstanceVCPUChange)
        }
        defer removeVMIVCPUChangeConditionAndLabel()

        if !vmiConditions.HasCondition(vmi, v1.VirtualMachineInstanceVCPUChange) {
                return nil
        }

        if vmi.IsCPUDedicated() {
                cpuLimitStr, ok := vmi.Labels[v1.VirtualMachinePodCPULimitsLabel]
                if !ok || len(cpuLimitStr) == 0 {
                        return fmt.Errorf("cannot read CPU limit from VMI annotation")
                }

                cpuLimit, err := strconv.Atoi(cpuLimitStr)
                if err != nil {
                        return fmt.Errorf("cannot parse CPU limit from VMI annotation: %v", err)
                }

                vcpus := hardware.GetNumberOfVCPUs(vmi.Spec.Domain.CPU)
                if vcpus > int64(cpuLimit) {
                        return fmt.Errorf("number of requested VCPUS (%d) exceeds the limit (%d)", vcpus, cpuLimit)
                }
        }

        options := virtualMachineOptions(
                nil,
                0,
                nil,
                c.capabilities,
                nil,
                c.clusterConfig)

        if err := client.SyncVirtualMachineCPUs(vmi, options); err != nil {
                return err
        }

        if vmi.Status.CurrentCPUTopology == nil {
                vmi.Status.CurrentCPUTopology = &v1.CPUTopology{}
        }

        vmi.Status.CurrentCPUTopology.Sockets = vmi.Spec.Domain.CPU.Sockets
        vmi.Status.CurrentCPUTopology.Cores = vmi.Spec.Domain.CPU.Cores
        vmi.Status.CurrentCPUTopology.Threads = vmi.Spec.Domain.CPU.Threads

        return nil
}

func (c *VirtualMachineController) hotplugMemory(vmi *v1.VirtualMachineInstance, client cmdclient.LauncherClient) error {
        vmiConditions := controller.NewVirtualMachineInstanceConditionManager()

        removeVMIMemoryChangeLabel := func() {
                delete(vmi.Labels, v1.VirtualMachinePodMemoryRequestsLabel)
                delete(vmi.Labels, v1.MemoryHotplugOverheadRatioLabel)
        }
        defer removeVMIMemoryChangeLabel()

        if !vmiConditions.HasCondition(vmi, v1.VirtualMachineInstanceMemoryChange) {
                return nil
        }

        podMemReqStr := vmi.Labels[v1.VirtualMachinePodMemoryRequestsLabel]
        podMemReq, err := resource.ParseQuantity(podMemReqStr)
        if err != nil {
                vmiConditions.RemoveCondition(vmi, v1.VirtualMachineInstanceMemoryChange)
                return fmt.Errorf("cannot parse Memory requests from VMI label: %v", err)
        }

        overheadRatio := vmi.Labels[v1.MemoryHotplugOverheadRatioLabel]
        requiredMemory := services.GetMemoryOverhead(vmi, runtime.GOARCH, &overheadRatio)
        requiredMemory.Add(
                c.netBindingPluginMemoryCalculator.Calculate(vmi, c.clusterConfig.GetNetworkBindings()),
        )

        requiredMemory.Add(*vmi.Spec.Domain.Resources.Requests.Memory())

        if podMemReq.Cmp(requiredMemory) < 0 {
                vmiConditions.RemoveCondition(vmi, v1.VirtualMachineInstanceMemoryChange)
                return fmt.Errorf("amount of requested guest memory (%s) exceeds the launcher memory request (%s)", vmi.Spec.Domain.Memory.Guest.String(), podMemReqStr)
        }

        options := virtualMachineOptions(nil, 0, nil, c.capabilities, nil, c.clusterConfig)

        if err := client.SyncVirtualMachineMemory(vmi, options); err != nil {
                // mark hotplug as failed
                vmiConditions.UpdateCondition(vmi, &v1.VirtualMachineInstanceCondition{
                        Type:    v1.VirtualMachineInstanceMemoryChange,
                        Status:  k8sv1.ConditionFalse,
                        Reason:  memoryHotplugFailedReason,
                        Message: "memory hotplug failed, the VM configuration is not supported",
                })
                return err
        }

        vmiConditions.RemoveCondition(vmi, v1.VirtualMachineInstanceMemoryChange)
        vmi.Status.Memory.GuestRequested = vmi.Spec.Domain.Memory.Guest
        return nil
}

func removeMigratedVolumes(vmi *v1.VirtualMachineInstance) {
        vmiConditions := controller.NewVirtualMachineInstanceConditionManager()
        vmiConditions.RemoveCondition(vmi, v1.VirtualMachineInstanceVolumesChange)
        vmi.Status.MigratedVolumes = nil
}

func parseLibvirtQuantity(value int64, unit string) *resource.Quantity {
        switch unit {
        case "b", "bytes":
                return resource.NewQuantity(value, resource.BinarySI)
        case "KB":
                return resource.NewQuantity(value*1000, resource.DecimalSI)
        case "MB":
                return resource.NewQuantity(value*1000*1000, resource.DecimalSI)
        case "GB":
                return resource.NewQuantity(value*1000*1000*1000, resource.DecimalSI)
        case "TB":
                return resource.NewQuantity(value*1000*1000*1000*1000, resource.DecimalSI)
        case "k", "KiB":
                return resource.NewQuantity(value*1024, resource.BinarySI)
        case "M", "MiB":
                return resource.NewQuantity(value*1024*1024, resource.BinarySI)
        case "G", "GiB":
                return resource.NewQuantity(value*1024*1024*1024, resource.BinarySI)
        case "T", "TiB":
                return resource.NewQuantity(value*1024*1024*1024*1024, resource.BinarySI)
        }
        return nil
}

func (c *VirtualMachineController) updateMemoryInfo(vmi *v1.VirtualMachineInstance, domain *api.Domain) error {
        if domain == nil || vmi == nil || domain.Spec.CurrentMemory == nil {
                return nil
        }
        if vmi.Status.Memory == nil {
                vmi.Status.Memory = &v1.MemoryStatus{}
        }
        currentGuest := parseLibvirtQuantity(int64(domain.Spec.CurrentMemory.Value), domain.Spec.CurrentMemory.Unit)
        vmi.Status.Memory.GuestCurrent = currentGuest
        return nil
}

func configureParallelMigrationThreads(options *cmdclient.MigrationOptions, vm *v1.VirtualMachineInstance) {
        // When the CPU is limited, there's a risk of the migration threads choking the CPU resources on the compute container.
        // For this reason, we will avoid configuring migration threads in such scenarios.
        if cpuLimit, cpuLimitExists := vm.Spec.Domain.Resources.Limits[k8sv1.ResourceCPU]; cpuLimitExists && !cpuLimit.IsZero() {
                return
        }

        options.ParallelMigrationThreads = pointer.P(parallelMultifdMigrationThreads)
}

func isReadOnlyDisk(disk *v1.Disk) bool {
        isReadOnlyCDRom := disk.CDRom != nil && (disk.CDRom.ReadOnly == nil || *disk.CDRom.ReadOnly)

        return isReadOnlyCDRom
}

kubevirt / kubevirt / fc2a21d4-1bc5-45fd-9cd3-b8dcbd6c5fde

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