linux-kernel - [ 41/52] KVM: nVMX: Fix erroneous exception bitmap check

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Message-Id: <20120510173136.455551655@linuxfoundation.org>
Date:	Thu, 10 May 2012 10:32:13 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Nadav HarEl <nyh@...ibm.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Avi Kivity <avi@...hat.com>
Subject: [ 41/52] KVM: nVMX: Fix erroneous exception bitmap check

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

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


From: Nadav Har'El <nyh@...h.technion.ac.il>

(cherry picked from commit 9587190107d0c0cbaccbf7bf6b0245d29095a9ae)

The code which checks whether to inject a pagefault to L1 or L2 (in
nested VMX) was wrong, incorrect in how it checked the PF_VECTOR bit.
Thanks to Dan Carpenter for spotting this.

Signed-off-by: Nadav Har'El <nyh@...ibm.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kvm/vmx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1678,7 +1678,7 @@ static int nested_pf_handled(struct kvm_
 	struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
 
 	/* TODO: also check PFEC_MATCH/MASK, not just EB.PF. */
-	if (!(vmcs12->exception_bitmap & PF_VECTOR))
+	if (!(vmcs12->exception_bitmap & (1u << PF_VECTOR)))
 		return 0;
 
 	nested_vmx_vmexit(vcpu);


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