Commit b6bb424b authored Aug 07, 2015 by Wei Huang Committed by Paolo Bonzini Aug 11, 2015

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>

parent 603242a8

arch/x86/kvm/pmu_amd.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -133,8 +133,6 @@ static int amd_pmu_set_msr(struct kvm_vcpu vcpu, struct msr_data msr_info)
		/* MSR_K7_PERFCTRn */
		pmc = get_gp_pmc(pmu, msr, MSR_K7_PERFCTR0);
		if (pmc) {
		if (!msr_info->host_initiated)
		data = (s64)data;
		pmc->counter += data - pmc_read_counter(pmc);
		return 0;
		}

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