linux-kernel - [PATCH 5/9] KVM: VMX: Dump VMCS on unexpected #VE

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Date: Fri, 17 May 2024 17:04:26 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/9] KVM: VMX: Dump VMCS on unexpected #VE

Dump the VMCS on an unexpected #VE, otherwise it's practically impossible
to figure out why the #VE occurred.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/vmx/vmx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 51b2cd13250a..0c68643d982b 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5217,8 +5217,10 @@ static int handle_exception_nmi(struct kvm_vcpu *vcpu)
 	if (is_invalid_opcode(intr_info))
 		return handle_ud(vcpu);
 
-	if (KVM_BUG_ON(is_ve_fault(intr_info), vcpu->kvm))
+	if (KVM_BUG_ON(is_ve_fault(intr_info), vcpu->kvm)) {
+		dump_vmcs(vcpu);
 		return -EIO;
+	}
 
 	error_code = 0;
 	if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
-- 
2.45.0.215.g3402c0e53f-goog