linux-kernel - [PATCH 3.12 37/98] KVM: VMX: avoid guest hang on invalid invept instruction

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Message-Id: <9016f711883248ab87473a31a3172160eced7a55.1460380917.git.jslaby@suse.cz>
Date:	Mon, 11 Apr 2016 15:22:39 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 37/98] KVM: VMX: avoid guest hang on invalid invept instruction

From: Paolo Bonzini <pbonzini@...hat.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 2849eb4f99d54925c543db12917127f88b3c38ff upstream.

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

Fixes: bfd0a56b90005f8c8a004baf407ad90045c2b11e
Reviewed-by: David Matlack <dmatlack@...gle.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 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 9e439266554d..92f9e2abf710 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6372,6 +6372,7 @@ 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;
 	}
 
-- 
2.8.1