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KVM: x86: nSVM: Save gPAT to vmcb12.g_pat on VMEXIT

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According to the APM volume 3 pseudo-code for "VMRUN," when nested paging
is enabled in the vmcb, the guest PAT register (gPAT) is saved to the vmcb
on emulated VMEXIT.

When KVM_X86_QUIRK_NESTED_SVM_SHARED_PAT is disabled and the vCPU is in
guest mode with nested NPT enabled, save the vmcb02 g_pat field to the
vmcb12 g_pat field on emulated VMEXIT.

Fixes: 15038e1472 ("KVM: SVM: obey guest PAT")
Signed-off-by: Jim Mattson <jmattson@google.com>
Link: https://patch.msgid.link/20260407190343.325299-7-jmattson@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Jim Mattson 2026-04-07 12:03:29 -07:00 committed by Sean Christopherson
parent 573321b945
commit d65cf222b8
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/svm/nested.c
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@ -1258,6 +1258,9 @@ static int nested_svm_vmexit_update_vmcb12(struct kvm_vcpu *vcpu)
vmcb12->save.dr6 = svm->vcpu.arch.dr6;
vmcb12->save.cpl = vmcb02->save.cpl;
if (l2_has_separate_pat(vcpu))
vmcb12->save.g_pat = vmcb02->save.g_pat;
if (guest_cpu_cap_has(vcpu, X86_FEATURE_SHSTK)) {
vmcb12->save.s_cet = vmcb02->save.s_cet;
vmcb12->save.isst_addr = vmcb02->save.isst_addr;