** Changed in: linux (Ubuntu Noble)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Noble)
Status: New => Fix Committed
** Changed in: linux (Ubuntu Jammy)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Jammy)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/2077321
Title:
Please backport the more restrictive XSAVES deactivation for Zen1/2
arch
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Jammy:
Fix Committed
Status in linux source package in Noble:
Fix Committed
Status in linux source package in Oracular:
Confirmed
Bug description:
On recent kernels, commit https://git.launchpad.net/~ubuntu-
kernel/ubuntu/+source/linux/+git/jammy/commit/?id=b0563468eeac88ebc70559d52a0b66efc37e4e9d
deactivate the XSAVES instruction for Zen 1/2 architectures.
This means that for a QEMU vm using cpu=host running on older kernels
where XSAVES is activated, it will not be possible to migrate that VM
to newer kernels which have the XSAVES disabled.
The more recent commit
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=29ba89f1895285f06c333546882e0c5ae9a6df23
only deactivates XSAVES on kernel where the fixed microcode is not
present.
This will prevent the QEMU migration problem to occur on AMD system
where the microcode has been correctly updated.
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