Public bug reported: 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. ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed ** Affects: linux (Ubuntu Jammy) Importance: Undecided Status: New ** Affects: linux (Ubuntu Noble) Importance: Undecided Status: New ** Affects: linux (Ubuntu Oracular) Importance: Undecided Status: Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2077321 Title: Please backport the more restrictive XSAVES deactivation for Zen1/2 arch To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2077321/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
