From: Alexandru Elisei <alexandru.elisei@xxxxxxx>
[ Upstream commit 2a71fabf6a1bc9162a84e18d6ab991230ca4d588 ]
According to ARM DDI 0487G.a, page D13-3895, setting the PMCR_EL0.P bit to
1 has the following effect:
"Reset all event counters accessible in the current Exception level, not
including PMCCNTR_EL0, to zero."
Similar behaviour is described for AArch32 on page G8-7022. Make it so.
Fixes: c01d6a18023b ("KVM: arm64: pmu: Only handle supported event counters")
Signed-off-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210618105139.83795-1-alexandru.elisei@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/arm64/kvm/pmu-emul.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index 2dd164bb1c5a..4b30260e1abf 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -578,6 +578,7 @@ 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) {
+ mask &= ~BIT(ARMV8_PMU_CYCLE_IDX);
for_each_set_bit(i, &mask, 32)
kvm_pmu_set_counter_value(vcpu, i, 0);
}
--
2.30.2
