From: Wei Huang <wei@xxxxxxxxxx>
We're missing the handling code for the cycle counter accessed
from a 32bit guest, leading to unexpected results.
Cc: stable@xxxxxxxxxxxxxxx # 4.6+
Signed-off-by: Wei Huang <wei@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
arch/arm64/kvm/sys_regs.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index f302fdb..87e7e66 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -597,8 +597,14 @@ static bool access_pmu_evcntr(struct kvm_vcpu *vcpu,
idx = ARMV8_PMU_CYCLE_IDX;
} else {
- BUG();
+ return false;
}
+ } else if (r->CRn == 0 && r->CRm == 9) {
+ /* PMCCNTR */
+ if (pmu_access_event_counter_el0_disabled(vcpu))
+ return false;
+
+ idx = ARMV8_PMU_CYCLE_IDX;
} else if (r->CRn == 14 && (r->CRm & 12) == 8) {
/* PMEVCNTRn_EL0 */
if (pmu_access_event_counter_el0_disabled(vcpu))
@@ -606,7 +612,7 @@ static bool access_pmu_evcntr(struct kvm_vcpu *vcpu,
idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
} else {
- BUG();
+ return false;
}
if (!pmu_counter_idx_valid(vcpu, idx))
--
2.1.4
--
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