Commit 64b81000 authored by Reiji Watanabe's avatar Reiji Watanabe Committed by Marc Zyngier
Browse files

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



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: default avatarOliver Upton <oliver.upton@linux.dev>
Signed-off-by: default avatarReiji Watanabe <reijiw@google.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230819043947.4100985-5-reijiw@google.com
parent 8c694f55

arch/arm64/kvm/pmu-emul.c

+4 −2
Original line number Diff line number Diff line
@@ -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;

	}