This is a consolidated v2 of two separate series, [1] and [2]. On systems where the PMUVer is not uniform across all PEs, KVM currently does not advertise PMUv3 to the guest, even if userspace successfully runs KVM_ARM_VCPU_INIT with KVM_ARM_VCPU_PMU_V3. The patch-1 and patch-2 will address this inconsistent behavior by disallowing userspace from configuring vPMU, as such systems would be extremely uncommon and unlikely to even use KVM (according to Marc [3]). The patch-3 will fix improper use of the host's PMUver to determine a valid range of PMU events for the guest (the guest's PMUver should be used instead). The patch-4 and patch-5 will try to hide the STALL_SLOT* events unconditionally per Oliver's suggestion [4]. Presently, KVM hides the STALL_SLOT event depending on the host PMU version, instead of the guest's PMU version, which doesn't seem to be accurate, as it appears that older PMU than PMUv3p4 could implement the event according to the Arm ARM. Exposing the STALL_SLOT event without PMMIR_EL1 (supported from PMUv3p4) for the guest won't be very useful though. The patch-4 stops advertising the event for guest unconditionally, rather than fixing or keeping the inaccurate checking to advertise the event for the case, where it is not very useful. The patch-5 stops advertising the STALL_SLOT_{FRONT,BACK}END events to the guest, similar to the STALL_SLOT event, as when any of these three events are implemented, all three of them should be implemented, according to the Arm ARM. This series is based on 6.5-rc3. [1] https://lore.kernel.org/all/20230610061520.3026530-1-reijiw@xxxxxxxxxx/ [2] https://lore.kernel.org/all/20230610194510.4146549-1-reijiw@xxxxxxxxxx/ [3] https://lore.kernel.org/all/874jnqp73o.wl-maz@xxxxxxxxxx/ [4] https://lore.kernel.org/all/ZIm1kdFBfXYMdfbV@xxxxxxxxx/ Reiji Watanabe (5): KVM: arm64: PMU: Use of pmuv3_implemented() instead of open-coded version KVM: arm64: PMU: Disallow vPMU on non-uniform PMUVer systems KVM: arm64: PMU: Avoid inappropriate use of host's PMUVer KVM: arm64: PMU: Don't advertise the STALL_SLOT event KVM: arm64: PMU: Don't advertise STALL_SLOT_{FRONTEND,BACKEND} arch/arm64/kvm/arm.c | 1 + arch/arm64/kvm/pmu-emul.c | 44 ++++++++++++++++++++++++++------------- include/kvm/arm_pmu.h | 3 +++ 3 files changed, 34 insertions(+), 14 deletions(-) base-commit: 6eaae198076080886b9e7d57f4ae06fa782f90ef -- 2.41.0.585.gd2178a4bd4-goog