Re: [PATCH 15/19] kvm: x86: Save and restore guest XFD_ERR properly

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On 12/11/21 01:10, Thomas Gleixner wrote:
     2) When the guest triggers #NM is takes an VMEXIT and the host
        does:

                 rdmsrl(MSR_XFD_ERR, vcpu->arch.guest_fpu.xfd_err);

        injects the #NM and goes on.

     3) When the guest writes to MSR_XFD_ERR it takes an VMEXIT and
        the host does:

            vcpu->arch.guest_fpu.xfd_err = msrval;
            wrmsrl(MSR_XFD_ERR, msrval);

No wrmsrl here I think, the host value is 0 and should stay so. Instead the wrmsrl will happen the next time the VCPU loop is entred.

Paolo



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