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KVM: arm64: PMU: Don't advertise STALL_SLOT_{FRONTEND,BACKEND}

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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@linux.dev>
Signed-off-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230819043947.4100985-5-reijiw@google.com
This commit is contained in:
Reiji Watanabe 2023-08-18 21:39:47 -07:00 committed by Marc Zyngier
parent 8c694f557f
commit 64b81000b6
1 changed files with 4 additions and 2 deletions
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6
arch/arm64/kvm/pmu-emul.c
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@ -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;
}