linux-kernel - [PATCH 4.4 016/210] KVM: VMX: avoid guest hang on invalid invvpid instruction

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Date:	Sun, 10 Apr 2016 11:33:57 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, jmontleo@...hat.com,
	David Matlack <dmatlack@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 4.4 016/210] KVM: VMX: avoid guest hang on invalid invvpid instruction

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

------------------

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

commit f6870ee9e53430f2a318ccf0dd5e66bb46194e43 upstream.

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

Reported-by: jmontleo@...hat.com
Tested-by: jmontleo@...hat.com
Fixes: 99b83ac893b84ed1a62ad6d1f2b6cc32026b9e85
Reviewed-by: David Matlack <dmatlack@...gle.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kvm/vmx.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7399,6 +7399,7 @@ static int handle_invvpid(struct kvm_vcp
 	if (!(types & (1UL << type))) {
 		nested_vmx_failValid(vcpu,
 			VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
+		skip_emulated_instruction(vcpu);
 		return 1;
 	}