* [PATCH] correctly mask pmc index bits in RDPMC instruction emulation
@ 2012-02-16 12:44 Gleb Natapov
2012-02-16 16:10 ` Avi Kivity
0 siblings, 1 reply; 2+ messages in thread
From: Gleb Natapov @ 2012-02-16 12:44 UTC (permalink / raw)
To: kvm; +Cc: avi, mtosatti
Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 7aad544..3e48c1d 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -413,7 +413,7 @@ int kvm_pmu_read_pmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data)
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)
--
Gleb.
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2012-02-16 12:44 [PATCH] correctly mask pmc index bits in RDPMC instruction emulation Gleb Natapov
2012-02-16 16:10 ` Avi Kivity
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