linux-kernel - [ 38/52] KVM: x86 emulator: correctly mask pmc index bits in RDPMC instruction emulation

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Date:	Thu, 10 May 2012 10:32:10 -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, Gleb Natapov <gleb@...hat.com>,
	Avi Kivity <avi@...hat.com>
Subject: [ 38/52] KVM: x86 emulator: correctly mask pmc index bits in RDPMC instruction emulation

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

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


From: Gleb Natapov <gleb@...hat.com>

(cherry picked from commit 270c6c79f4e15e599f47174ecedad932463af7a2)


Signed-off-by: Gleb Natapov <gleb@...hat.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kvm/pmu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -413,7 +413,7 @@ int kvm_pmu_read_pmc(struct kvm_vcpu *vc
 	struct kvm_pmc *counters;
 	u64 ctr;
 
-	pmc &= (3u << 30) - 1;
+	pmc &= ~(3u << 30);
 	if (!fixed && pmc >= pmu->nr_arch_gp_counters)
 		return 1;
 	if (fixed && pmc >= pmu->nr_arch_fixed_counters)


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