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KVM: x86/vPMU: Fix unnecessary signed extension for AMD PERFCTRn 

According to AMD programmer's manual, AMD PERFCTRn is 64-bit MSR which,
unlike Intel perf counters, doesn't require signed extension. This
patch removes the unnecessary conversion in SVM vPMU code when PERFCTRn
is being updated.

Signed-off-by: Wei Huang <wei@redhat.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wei Huang 2015-08-07 15:53:30 -04:00 committed by Paolo Bonzini
parent 603242a88a
commit b6bb424b40
1 changed files with 0 additions and 2 deletions
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2
arch/x86/kvm/pmu_amd.c
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@ -133,8 +133,6 @@ static int amd_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
/* MSR_K7_PERFCTRn */ /* MSR_K7_PERFCTRn */
pmc = get_gp_pmc(pmu, msr, MSR_K7_PERFCTR0); pmc = get_gp_pmc(pmu, msr, MSR_K7_PERFCTR0);
if (pmc) { if (pmc) {
if (!msr_info->host_initiated)
data = (s64)data;
pmc->counter += data - pmc_read_counter(pmc); pmc->counter += data - pmc_read_counter(pmc);
return 0; return 0;
} }