[PATCH v3 4/4] KVM: arm64: PMU: Don't advertise STALL_SLOT_{FRONTEND,BACKEND}

[Reiji Watanabe]

Don't advertise STALL_SLOT_{FRONT,BACK}END events to the guest,
similar to STALL_SLOT event, as when any of these three events
are implemented, all three of them should be implemented,
according to the Arm ARM.

Suggested-by: Oliver Upton <oliver.upton at linux.dev>
Signed-off-by: Reiji Watanabe <reijiw at google.com>
---
 arch/arm64/kvm/pmu-emul.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index b9633deff32a..6b066e04dc5d 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -758,10 +758,12 @@ u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1)
 	} else {
 		val = read_sysreg(pmceid1_el0);
 		/*
-		 * Don't advertise STALL_SLOT, as PMMIR_EL0 is handled
+		 * Don't advertise STALL_SLOT*, as PMMIR_EL0 is handled
 		 * as RAZ
 		 */
-		val &= ~BIT_ULL(ARMV8_PMUV3_PERFCTR_STALL_SLOT - 32);
+		val &= ~(BIT_ULL(ARMV8_PMUV3_PERFCTR_STALL_SLOT - 32) |
+			 BIT_ULL(ARMV8_PMUV3_PERFCTR_STALL_SLOT_FRONTEND - 32) |
+			 BIT_ULL(ARMV8_PMUV3_PERFCTR_STALL_SLOT_BACKEND - 32));
 		base = 32;
 	}
 
-- 
2.42.0.rc1.204.g551eb34607-goog