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Thu, 05 Mar 2026 03:50:29 -0800 (PST) Received: from ho-tower-lan.lan ([185.48.77.170]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4399c60e40fsm48919998f8f.7.2026.03.05.03.50.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Mar 2026 03:50:29 -0800 (PST) From: James Clark Date: Thu, 05 Mar 2026 11:50:01 +0000 Subject: [PATCH] KVM: arm64: Read PMUVer as unsigned Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260305-james-kvm-pmuver-sign-v1-1-eea0a2116dd0@linaro.org> X-B4-Tracking: v=1; b=H4sIAOhtqWkC/x3MQQqDMBBG4avIrB2IEaV4FXGRNr92lETJ0FAQ7 25w+S3eO0mRBEpDdVJCFpU9FjR1RZ+viwtYfDFZY3vTmo5XF6C85cBH+GUkVlkiz3i15u3hvPV U2iNhlv/zHafrugEKnUWbZwAAAA== To: Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Colton Lewis , Alexandru Elisei Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, James Clark X-Mailer: b4 0.14.0 ID_AA64DFR0_EL1.PMUVer is an unsigned field, so this skips initialization of host_data_ptr(nr_event_counters) for PMUv3 for Armv8.8 onwards as they appear as negative values. Fix it by reading it as unsigned. Fixes: 2417218f2f23 ("KVM: arm64: Get rid of __kvm_get_mdcr_el2() and relat= ed warts") Signed-off-by: James Clark --- arch/arm64/kvm/debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c index 3ad6b7c6e4ba..b8632edba9a3 100644 --- a/arch/arm64/kvm/debug.c +++ b/arch/arm64/kvm/debug.c @@ -76,7 +76,7 @@ void kvm_init_host_debug_data(void) { u64 dfr0 =3D read_sysreg(id_aa64dfr0_el1); =20 - if (cpuid_feature_extract_signed_field(dfr0, ID_AA64DFR0_EL1_PMUVer_SHIFT= ) > 0) + if (cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_EL1_PMUVer_SHI= FT) > 0) *host_data_ptr(nr_event_counters) =3D FIELD_GET(ARMV8_PMU_PMCR_N, read_sysreg(pmcr_el0)); =20 --- base-commit: c107785c7e8dbabd1c18301a1c362544b5786282 change-id: 20260305-james-kvm-pmuver-sign-fe830bdead2d Best regards, --=20 James Clark