linux-kernel - [PATCH 1/3] KVM: VMX: avoid guest hang on invalid invept instruction

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Message-Id: <1458317379-8363-2-git-send-email-pbonzini@redhat.com>
Date:	Fri, 18 Mar 2016 17:09:37 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	jmontleo@...hat.com, bdas@...hat.com, stable@...r.kernel.org
Subject: [PATCH 1/3] KVM: VMX: avoid guest hang on invalid invept instruction

A guest executing an invalid invept instruction would hang
because the instruction pointer was not updated.

Cc: stable@...r.kernel.org
Fixes: bfd0a56b90005f8c8a004baf407ad90045c2b11e
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/vmx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 5e45c2731a5d..17b20b52d30e 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7399,6 +7399,7 @@ static int handle_invept(struct kvm_vcpu *vcpu)
 	if (!(types & (1UL << type))) {
 		nested_vmx_failValid(vcpu,
 				VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
+		skip_emulated_instruction(vcpu);
 		return 1;
 	}
 
-- 
1.8.3.1