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Mon, 05 Jan 2026 12:27:22 -0800 (PST) Date: Mon, 5 Jan 2026 12:27:20 -0800 In-Reply-To: <20251231143917.3047237-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <2025122929-riveter-outreach-a5e9@gregkh> <20251231143917.3047237-1-sashal@kernel.org> Message-ID: Subject: Re: [PATCH 5.15.y] KVM: SVM: Mark VMCB_NPT as dirty on nested VMRUN From: Sean Christopherson To: Sasha Levin Cc: stable@vger.kernel.org, Jim Mattson Content-Type: text/plain; charset="us-ascii" On Wed, Dec 31, 2025, Sasha Levin wrote: > From: Jim Mattson > > [ Upstream commit 7c8b465a1c91f674655ea9cec5083744ec5f796a ] > > 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: 4bb170a5430b ("KVM: nSVM: do not mark all VMCB02 fields dirty on nested vmexit") > Cc: stable@vger.kernel.org > Signed-off-by: Jim Mattson > Link: https://lore.kernel.org/r/20250922162935.621409-3-jmattson@google.com > Signed-off-by: Sean Christopherson > [ adapted vmcb02 local variable to svm->vmcb direct access pattern ] FWIW, I double checked that vmcb02 is indeed guaranteed to be the active vmcb. > Signed-off-by: Sasha Levin > --- Acked-by: Sean Christopherson