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KVM: SVM: Mark VMCB_NPT as dirty on nested VMRUN

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Mark the VMCB_NPT bit as dirty in nested_vmcb02_prepare_save()
on every nested VMRUN.

If L1 changes the PAT MSR between two VMRUN instructions on the same
L1 vCPU, the g_pat field in the associated vmcb02 will change, and the
VMCB_NPT clean bit should be cleared.

Fixes: 4bb170a543 ("KVM: nSVM: do not mark all VMCB02 fields dirty on nested vmexit")
Cc: stable@vger.kernel.org
Signed-off-by: Jim Mattson <jmattson@google.com>
Link: https://lore.kernel.org/r/20250922162935.621409-3-jmattson@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Jim Mattson 2025-09-22 09:29:23 -07:00 committed by Sean Christopherson
parent 93c9e10738
commit 7c8b465a1c
1 changed files with 1 additions and 0 deletions
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arch/x86/kvm/svm/nested.c
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@ -613,6 +613,7 @@ static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12
struct kvm_vcpu *vcpu = &svm->vcpu;
nested_vmcb02_compute_g_pat(svm);
vmcb_mark_dirty(vmcb02, VMCB_NPT);
/* Load the nested guest state */
if (svm->nested.vmcb12_gpa != svm->nested.last_vmcb12_gpa) {