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KVM: arm64: pmu: Only handle supported event counters

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Let the code never use unsupported event counters. Change
kvm_pmu_handle_pmcr() to only reset supported counters and
kvm_pmu_vcpu_reset() to only stop supported counters.

Other actions are filtered on the supported counters in
kvm/sysregs.c

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200124142535.29386-5-eric.auger@redhat.com
This commit is contained in:
Eric Auger 2020-01-24 15:25:35 +01:00 committed by Marc Zyngier
parent aa76829171
commit c01d6a1802
1 changed files with 5 additions and 5 deletions
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10
virt/kvm/arm/pmu.c
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@ -247,10 +247,11 @@ void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu)
*/
void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu)
{
int i;
unsigned long mask = kvm_pmu_valid_counter_mask(vcpu);
struct kvm_pmu *pmu = &vcpu->arch.pmu;
int i;
for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++)
for_each_set_bit(i, &mask, 32)
kvm_pmu_stop_counter(vcpu, &pmu->pmc[i]);
bitmap_zero(vcpu->arch.pmu.chained, ARMV8_PMU_MAX_COUNTER_PAIRS);
@ -527,10 +528,9 @@ void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val)
*/
void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val)
{
u64 mask;
unsigned long mask = kvm_pmu_valid_counter_mask(vcpu);
int i;
mask = kvm_pmu_valid_counter_mask(vcpu);
if (val & ARMV8_PMU_PMCR_E) {
kvm_pmu_enable_counter_mask(vcpu,
__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & mask);
@ -542,7 +542,7 @@ void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val)
kvm_pmu_set_counter_value(vcpu, ARMV8_PMU_CYCLE_IDX, 0);
if (val & ARMV8_PMU_PMCR_P) {
for (i = 0; i < ARMV8_PMU_CYCLE_IDX; i++)
for_each_set_bit(i, &mask, 32)
kvm_pmu_set_counter_value(vcpu, i, 0);
}
}