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([2604:3d08:8e80:f800:3c86:745c:97f1:5486]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2eb39266f42sm384225ad.40.2026.10.29.16.50.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 16:50:44 -0700 (PDT) From: ma.mandourr@gmail.com To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Mahmoud Abumandour Subject: [PATCH 0/2] KVM: nVMX: Don't let L2's LMSW modify CR0 bits owned by L1 Date: Thu, 29 Oct 2026 16:50:38 -0700 Message-ID: <20261029235040.12013-1-ma.mandourr@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Mahmoud Abumandour When L2's LMSW exits to L0 but not to L1, KVM emulates it with kvm_lmsw(), which ignores vmcs12's CR0 guest/host mask, so L2 can change CR0 bits that L1 owns. Mahmoud Abumandour (2): KVM: nVMX: Don't let L2's LMSW modify CR0 bits owned by L1 KVM: selftests: Verify that L2's LMSW leaves L1-owned CR0 bits alone arch/x86/kvm/vmx/vmx.c | 15 ++++++++ .../kvm/x86/nested_exceptions_test.c | 36 +++++++++++++++++++ 2 files changed, 51 insertions(+) base-commit: dea4f6380f4ec96e8f3b0aaf2343764bd0d25ef4 -- 2.25.1