From: Eric Auger eric.auger@redhat.com
commit 3837407c1aa1101ed5e214c7d6041e7a23335c6e upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- virt/kvm/arm/pmu.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/virt/kvm/arm/pmu.c +++ b/virt/kvm/arm/pmu.c @@ -316,6 +316,9 @@ void kvm_pmu_software_increment(struct k 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)))