Re: [PATCH] KVM: x86: Allow XSAVES on CPUs where host doesn't use it due to an errata

[Jim Mattson]

On Thu, Nov 30, 2023 at 2:00 PM Maciej S. Szmigiero
<mail@xxxxxxxxxxxxxxxxxxxxx> wrote:
> I think that if particular guest would work on bare metal it should
> work on "-cpu host" too - no tinkering should be required for such
> basic functionality as being able to successfully finish booting.

I disagree. Let's not focus on one particular erratum. If, for
whatever reason, the host kernel is booted with "noxsaves," I don't
think KVM should allow a guest to bypass that directive.