xapi-project / xen-api
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LAST BUILD ON BRANCH gh-readonly-queue/master/pr-6572-5be84a4da9738b0c87e675f272d57dfbfc5e0186
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CA-393417: Drop device controller of cgroup v1 and fix USB passthrough for XS9 (#6572)

The approach work for both XS8 and XS9

- 4357061 for xs9
- 4357062 for xs8

```
Date:   Fri Jul 4 15:40:00 2025 +0800

    CA-393417: Bind mount /proc/<pid> into chroot

    From strace/gdb, XS9 qemu requires /proc/self/fd/<fd> to work well
    This is due to systemd/libudev update.

    Just bind mount /proc/self/ to the chroot to permit qemu access

    ```
    1047 openat(AT_FDCWD, "/proc/self/fd/46", O_RDONLY|O_NOCTTY|O_CLOEXEC|O_PATH) = -1 ENOENT (No such file or directory)
    1048 openat(AT_FDCWD, "/proc/", O_RDONLY|O_NOCTTY|O_CLOEXEC|O_PATH) = -1 ENOENT (No such file or directory)

        ../sysdeps/unix/sysv/linux/fstatfs64.c:30
        out>, dir_fd=<optimized out>) at ../src/basic/stat-util.c:566
        magic_value=1650812274) at ../src/basic/stat-util.c:369
        fd=<optimized out>) at ../src/basic/stat-util.h:66
        verify=<optimized out>) at
    ../src/libsystemd/sd-device/sd-device.c:221
        (ret=0x7ffc67ebba20, syspath=0x7ffc67ebb950
    "/sys/bus/usb/devices/usb1", strict=true)
        at ../src/libsystemd/sd-device/sd-device.c:271
        (syspath=0x7ffc67ebb950 "/sys/bus/usb/devices/usb1",
    ret=0x7ffc67ebba20)
        at ../src/libsystemd/sd-device/sd-device.c:280
    ```

    Signed-off-by: Lin Liu <Lin.Liu01@cloud.com>

commit fc5f98b80
Author: Lin Liu <Lin.Liu01@cloud.com>
Date:   Tue Jul 1 15:56:18 2025 +0800

    CA-393417: Drop device controller of cgroup v1

    For deprivileged qemu, following ops are performed
    - bind mount /dev/ to qemu chroot, so qemu can access it
    - cgroup controller deny all devices, except the target usb device

    However, new XS updated to cgroup v2 and the devices controller
    available anymore.

    Instead of bind mount all /dev folder, only the permitted usb
    devices are created into the chroot. Thus, the cgroup controller
    is no longer necessary.

... (continued)

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Source Files on gh-readonly-queue/master/pr-6572-5be84a4da9738b0c87e675f272d57dfbfc5e0186

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16131860473 gh-readonly-queue/master/pr-6572-5be84a4da9738b0c87e675f272d57dfbfc5e0186 CA-393417: Drop device controller of cgroup v1 and fix USB passthrough for XS9 (#6572) The approach work for both XS8 and XS9 - 4357061 for xs9 - 4357062 for xs8 ``` Date: Fri Jul 4 15:40:00 2025 +0800 CA-393417: Bind mount /proc/<pid> i... push web-flow github
80.35
16131860161 gh-readonly-queue/master/pr-6572-5be84a4da9738b0c87e675f272d57dfbfc5e0186 CA-393417: Drop device controller of cgroup v1 and fix USB passthrough for XS9 (#6572) The approach work for both XS8 and XS9 - 4357061 for xs9 - 4357062 for xs8 ``` Date: Fri Jul 4 15:40:00 2025 +0800 CA-393417: Bind mount /proc/<pid> i... push web-flow github
80.35
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