linux-kernel - [PATCH 0/2] KVM: SVM: Aggressively clear vmcb02 clean bits

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Message-ID: <20250922162935.621409-1-jmattson@google.com>
Date: Mon, 22 Sep 2025 09:29:21 -0700
From: Jim Mattson <jmattson@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Jim Mattson <jmattson@...gle.com>
Subject: [PATCH 0/2] KVM: SVM: Aggressively clear vmcb02 clean bits

It is unlikely that L1 will toggle the MSR intercept bit in vmcb02,
or that L1 will change its own IA32_PAT MSR. However, if it does,
the affected fields in vmcb02 should not be marked clean.

An alternative approach would be to implement a set of mutators for
vmcb02 fields, and to clear the associated clean bit whenever a field
is modified.

Jim Mattson (2):
  KVM: SVM: Mark VMCB_PERM_MAP as dirty on nested VMRUN
  KVM: SVM: Mark VMCB_NPT as dirty on nested VMRUN

 arch/x86/kvm/svm/nested.c | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.51.0.470.ga7dc726c21-goog