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[v3,04/14] KVM: arm64: Always support SW_INCR PMU event

Message ID 20250305202641.428114-5-oliver.upton@linux.dev (mailing list archive)
State New
Headers show
Series KVM: arm64: FEAT_PMUv3 on Apple hardware | expand

Commit Message

Oliver Upton March 5, 2025, 8:26 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.

Tested-by: Janne Grunau <j@jannau.net>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
 arch/arm64/kvm/pmu-emul.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index 104672a0c5a2..62349b670cf9 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -856,6 +856,8 @@  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;