[pve-devel] applied: [PATCH] kvm: xsave set: mask-out PKRU bit in xfeatures if vCPU has no support

[Fiona Ebner]

Am 14.07.23 um 20:30 schrieb Thomas Lamprecht:
> 
> If it gains us something we can drop this patch a bit in the future
> Proxmox VE 9 major release, but we should ensure that VMs that where
> started before PVE 8 cannot be directly live-migrated to the release
> that includes that change; so we should rather only drop it if the
> maintenance burden is high.

After live-migrating to a kernel with this patch, the flag won't show up
in subsequent migration blobs (i.e. guest_xsave->region) anymore, right?
So afterwards, you can migrate to kernels without this patch without
risking to trigger the issue. But there could still be snapshots from
before PVE 8 that can trigger the issue in PVE 9 if we'd drop this patch.