KVM: x86 emulator: correctly mask pmc index bits in RDPMC instruction…

… emulation Signed-off-by: Gleb Natapov <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
mna · Mar 8, 2012 · 270c6c7 · 270c6c7
1 parent 565f3be
commit 270c6c7
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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)