From: Gleb Natapov <gleb@redhat.com>
To: kvm@vger.kernel.org
Cc: avi@redhat.com, mtosatti@redhat.com
Subject: [PATCH] correctly mask pmc index bits in RDPMC instruction emulation
Date: Thu, 16 Feb 2012 14:44:11 +0200 [thread overview]
Message-ID: <20120216124411.GE19771@redhat.com> (raw)
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.
next reply other threads:[~2012-02-16 12:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-16 12:44 Gleb Natapov [this message]
2012-02-16 16:10 ` [PATCH] correctly mask pmc index bits in RDPMC instruction emulation Avi Kivity
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