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KVM: x86/vPMU: introduce kvm_pmu_msr_idx_to_pmc

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This function will be part of the kvm_pmu_ops interface.  Introduce
it already.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wei Huang 2015-06-19 16:16:59 +02:00 committed by Paolo Bonzini
parent e5af058aac
commit 41aac14a8d
1 changed files with 18 additions and 6 deletions
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24
arch/x86/kvm/pmu.c
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@ -348,22 +348,34 @@ int kvm_pmu_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx)
(fixed && idx >= pmu->nr_arch_fixed_counters);
}
int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data)
static struct kvm_pmc *kvm_pmu_msr_idx_to_pmc(struct kvm_vcpu *vcpu,
unsigned idx)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
bool fast_mode = idx & (1u << 31);
bool fixed = idx & (1u << 30);
struct kvm_pmc *counters;
u64 ctr_val;
idx &= ~(3u << 30);
if (!fixed && idx >= pmu->nr_arch_gp_counters)
return 1;
return NULL;
if (fixed && idx >= pmu->nr_arch_fixed_counters)
return 1;
return NULL;
counters = fixed ? pmu->fixed_counters : pmu->gp_counters;
ctr_val = pmc_read_counter(&counters[idx]);
return &counters[idx];
}
int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data)
{
bool fast_mode = idx & (1u << 31);
struct kvm_pmc *pmc;
u64 ctr_val;
pmc = kvm_pmu_msr_idx_to_pmc(vcpu, idx);
if (!pmc)
return 1;
ctr_val = pmc_read_counter(pmc);
if (fast_mode)
ctr_val = (u32)ctr_val;