Re: [PATCH 20/22] KVM: SVM: enable GMET and set it in MMU role

[Paolo Bonzini]

On Wed, Mar 25, 2026 at 10:40 AM Nikunj A. Dadhania <nikunj@xxxxxxx> wrote:
>
>
>
> On 3/25/2026 2:59 PM, Paolo Bonzini wrote:
> > On Wed, Mar 25, 2026 at 10:26 AM Nikunj A. Dadhania <nikunj@xxxxxxx> wrote:
> >>
> >>
> >>
> >> On 3/21/2026 5:39 AM, Paolo Bonzini wrote:
> >>> @@ -1184,6 +1187,10 @@ static void init_vmcb(struct kvm_vcpu *vcpu)
> >>>               save->g_pat = vcpu->arch.pat;
> >>>               save->cr3 = 0;
> >>>       }
> >>> +
> >>> + if (gmet_enabled)
> >>
> >> if (gmet_enabled && guest_cpu_cap_has(vcpu, X86_FEATURE_GMET))
> >
> > No, this is the non-nested case (vmcb01) and I'm enabling GMET on
> > purpose for easier testing.
>
> Win11 guest with memory isolation stops booting after this patch. Boots if I pass gmet=0.

That would also disable GMET in the Hyper-V nested guest. I'm looking at it.

Paolo