xcp-ng / xen-api
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CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864)

We want to rely on a Linux guest kernel to announce supported control
features like suspend. In the unlikely case that a guest Linux kernel
does not support this, provide a flag to re-enable previous behavior:
the toolstack assumes a set of supported features. Linux kernel 3.0 and
above announce features.

The flag is false by default, as such introducing the new behaviour.

This closes a window for a data race that caused XSI-1958: the toolstack
announced control features before the Linux guest kernel was ready and
announced them a moment later. A request coming in before the kernel was
ready caused the request to be missed by the kernel.

Previous behavior and timing is below: observe that dom0 announces the
features before domain 7. Some details are omitted.

2026-01-27T10:22:04 dt034 oxd: DOM0 write /l/d/7/control/feature-suspend
1
2026-01-27T10:22:04 dt034 oxd: DOM0 write
/l/d/7/control/feature-poweroff 1
2026-01-27T10:22:04 dt034 oxd: DOM0 write /l/d/7/control/feature-reboot
1
2026-01-27T10:22:04 dt034 oxd: DOM0 write
/l/d/7/control/feature-vcpu-hotplug 1

2026-01-27T10:22:06 dt034 oxd: DOM7 write control/feature-poweroff 1
2026-01-27T10:22:06 dt034 oxd: DOM7 write control/feature-reboot 1
2026-01-27T10:22:06 dt034 oxd: DOM7 write control/feature-suspend 1
2026-01-27T10:22:10 dt034 oxd: DOM7 write control/feature-balloon 1

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22986442964 master CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864) We want to rely on a Linux guest kernel to announce supported control features like suspend. In the unlikely case that a guest Linux kernel does not support this, provide... push web-flow github
80.46
22936507046 master CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864) We want to rely on a Linux guest kernel to announce supported control features like suspend. In the unlikely case that a guest Linux kernel does not support this, provide... push web-flow github
80.46
22886867403 master CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864) We want to rely on a Linux guest kernel to announce supported control features like suspend. In the unlikely case that a guest Linux kernel does not support this, provide... push web-flow github
80.46
22838332867 master CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864) We want to rely on a Linux guest kernel to announce supported control features like suspend. In the unlikely case that a guest Linux kernel does not support this, provide... push web-flow github
80.46
22813728151 master CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864) We want to rely on a Linux guest kernel to announce supported control features like suspend. In the unlikely case that a guest Linux kernel does not support this, provide... push web-flow github
80.46
22791682503 master CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864) We want to rely on a Linux guest kernel to announce supported control features like suspend. In the unlikely case that a guest Linux kernel does not support this, provide... push web-flow github
80.46
22748819523 master CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864) We want to rely on a Linux guest kernel to announce supported control features like suspend. In the unlikely case that a guest Linux kernel does not support this, provide... push web-flow github
80.46
22702104728 master CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864) We want to rely on a Linux guest kernel to announce supported control features like suspend. In the unlikely case that a guest Linux kernel does not support this, provide... push web-flow github
80.46
22654805391 master CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864) We want to rely on a Linux guest kernel to announce supported control features like suspend. In the unlikely case that a guest Linux kernel does not support this, provide... push web-flow github
80.46
22608154830 master CP-311165 XSI-1958 rely on Linux guest to announce control features (#6864) We want to rely on a Linux guest kernel to announce supported control features like suspend. In the unlikely case that a guest Linux kernel does not support this, provide... push web-flow github
80.46
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