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[06/18] KVM: arm64: Always support SW_INCR PMU event

Message ID 20241217212048.3709204-7-oliver.upton@linux.dev (mailing list archive)
State New
Headers show
Series KVM: arm64: Support FEAT_PMUv3 on Apple hardware | expand

Commit Message

Oliver Upton Dec. 17, 2024, 9:20 p.m. UTC 
Support for SW_INCR is unconditional, as KVM traps accesses to
PMSWINC_EL0 and emulates the intended event increment. While it is
expected that ~all PMUv3 implementations already advertise this event,
non-PMUv3 hardware may not.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
 arch/arm64/kvm/pmu-emul.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index 809d65b912e8..7f20da32266e 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -875,6 +875,8 @@  static u64 compute_pmceid0(struct arm_pmu *pmu)
 {
 	u64 val = __compute_pmceid(pmu, 0);
 
+	/* always support SW_INCR */
+	val |= BIT(ARMV8_PMUV3_PERFCTR_SW_INCR);
 	/* always support CHAIN */
 	val |= BIT(ARMV8_PMUV3_PERFCTR_CHAIN);
 	return val;