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authorEric Auger2020-01-24 15:25:32 +0100
committerMarc Zyngier2020-01-28 12:50:32 +0000
commit3837407c1aa1101ed5e214c7d6041e7a23335c6e (patch)
tree1a7addbb3015674bffbde53ec6c64cf25396cd69 /virt/kvm/arm
parent21aecdbd7f3ab02c9b82597dc733ee759fb8b274 (diff)
KVM: arm64: pmu: Don't increment SW_INCR if PMCR.E is unset
The specification says PMSWINC increments PMEVCNTR<n>_EL1 by 1 if PMEVCNTR<n>_EL0 is enabled and configured to count SW_INCR. For PMEVCNTR<n>_EL0 to be enabled, we need both PMCNTENSET to be set for the corresponding event counter but we also need the PMCR.E bit to be set. Fixes: 7a0adc7064b8 ("arm64: KVM: Add access handler for PMSWINC register") Signed-off-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Andrew Murray <andrew.murray@arm.com> Acked-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200124142535.29386-2-eric.auger@redhat.com
Diffstat (limited to 'virt/kvm/arm')
-rw-r--r--virt/kvm/arm/pmu.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index 8731dfeced8b..c3f8b059881e 100644
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -486,6 +486,9 @@ void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val)
if (val == 0)
return;
+ if (!(__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E))
+ return;
+
enable = __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
for (i = 0; i < ARMV8_PMU_CYCLE_IDX; i++) {
if (!(val & BIT(i)))