Re: [PATCH] x86/kvm: Account for fpstate->user_xfeatures changes

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On Wed, Sep 13, 2023 at 09:00:03PM -0400, Tyler Stachecki wrote:
> qemu then both ceases to put the remaining (non-XSAVE) x86
> architectural state into KVM and makes the fateful mistake
> of resuming the guest anyways. This usually results in
> immediate guest corruption, silent or not.

I just want to highlight that although this is probably more of a bug with
respect to how qemu is handling things, the original patches from Leo are
starting to appear in many distro stable kernels and are really putting a
spanner in the works for maintaining VMs that are long-lived in nature.

At present, if you take the fix for PKRU migration issues (or if you are just
in need a more recent kernel), you are dealt with a situation where live-
migrating VMs to a kernel patched for the PKRU issue from one that is not
potentially crashes or corrupts skads of VMs.

There is no fix for qemu that I am aware of yet. Although, I am willing to
look into one if that is more palatable, I filed this patch on the premise
of "don't break userspace"...



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