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| author | Eric Auger <eric.auger@redhat.com> | 2020-01-24 15:25:35 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-01-28 13:05:05 +0000 |
| commit | c01d6a18023b94fdd0cb7cf11bbfe769bf71653f (patch) | |
| tree | 2b72cd9e5e1dfec623938181a4a4599f47667ded /virt | |
| parent | aa76829171e98bd75a0cc00b6248eca269ac7f4f (diff) | |
| download | linux-c01d6a18023b94fdd0cb7cf11bbfe769bf71653f.tar.bz2 | |
KVM: arm64: pmu: Only handle supported event counters
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
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/pmu.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c index 560db6282137..f0d0312c0a55 100644 --- a/virt/kvm/arm/pmu.c +++ b/virt/kvm/arm/pmu.c @@ -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); } } |