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[192.75.244.14]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ad80219f83sm2355155a91.6.2026.10.20.21.26.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Oct 2026 21:26:10 -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 1/2] KVM: nVMX: Don't clobber VM-Entry instruction length when saving soft INTn Date: Tue, 20 Oct 2026 21:26:02 -0700 Message-ID: <20261021042603.608292-2-ma.mandourr@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261021042603.608292-1-ma.mandourr@gmail.com> References: <20261021042603.608292-1-ma.mandourr@gmail.com> 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 a VM-Exit from L2 occurs while vectoring a software interrupt, write the instruction length to vmcs12's VM-Exit instruction length field, as is done for software exceptions, not to the VM-Entry instruction length field, which belongs to L1. Found with a differential testing harness for VMX isolation. Fixes: 5f3d5799974b ("KVM: nVMX: Rework event injection and recovery") Signed-off-by: Mahmoud Abumandour --- arch/x86/kvm/vmx/nested.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 9b0bfa2f854c..302f5b5aa582 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4016,7 +4016,7 @@ static void vmcs12_save_pending_event(struct kvm_vcpu *vcpu, if (vcpu->arch.interrupt.soft) { idt_vectoring |= INTR_TYPE_SOFT_INTR; - vmcs12->vm_entry_instruction_len = + vmcs12->vm_exit_instruction_len = vcpu->arch.event_exit_inst_len; } else idt_vectoring |= INTR_TYPE_EXT_INTR; -- 2.43.0