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Wed, 30 Sep 2026 14:18:34 -0700 (PDT) Date: Wed, 30 Sep 2026 21:18:32 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog Message-ID: <20260930211834.2773546-1-coltonlewis@google.com> Subject: [PATCH v2 0/2] KVM: arm64: Handle hidden FEAT_PMUv3 in ID_AA64DFR0_EL1 From: Colton Lewis To: kvmarm@lists.linux.dev Cc: maz@kernel.org, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, pbonzini@redhat.com, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Colton Lewis Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260930_141837_083648_C6315D9E X-CRM114-Status: GOOD ( 10.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When userspace initializes a vCPU with KVM_ARM_VCPU_PMU_V3 and hides FEAT_PMUv3 via ID_AA64DFR0_EL1.PMUVer, KVM hits a WARN_ONCE("Unknown PMU version 0") during reset_pmevtyper() and continues to expose PMU system registers instead of emulating guest accesses as UNDEF. Patch 1 handles ID_AA64DFR0_EL1_PMUVer_NI in __kvm_pmu_event_mask() and removes the redundant kvm_vcpu_has_pmu() check in reset_pmevtyper(). Patch 2 updates pmu_visibility() to check ID_AA64DFR0_EL1.PMUVer via kvm_has_feat() so PMU registers are marked REG_HIDDEN when FEAT_PMUv3 is not advertised. Changes in v2: - Handle ID_AA64DFR0_EL1_PMUVer_NI in __kvm_pmu_event_mask() and drop the kvm_vcpu_has_pmu() check in reset_pmevtyper() (Oliver) - Drop Cc: stable@vger.kernel.org (Oliver) - Add patch 2 to check ID_AA64DFR0_EL1.PMUVer in pmu_visibility() (Oliver) - Link to v1: https://lore.kernel.org/r/20260929220411.3756519-1-coltonlewis@google.com Colton Lewis (2): KVM: arm64: Handle ID_AA64DFR0_EL1.PMUVer == NI in __kvm_pmu_event_mask() KVM: arm64: Check ID_AA64DFR0_EL1.PMUVer in pmu_visibility() arch/arm64/kvm/pmu-emul.c | 5 ++++- arch/arm64/kvm/sys_regs.c | 6 +----- 2 files changed, 5 insertions(+), 6 deletions(-) -- 2.56.0.rc1.315.gc6ed9934b7-goog