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Sun, 15 Feb 2026 19:44:56 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [RFC PATCH 09/13] target/arm: Detect SME in kvm_arm_get_host_cpu_features Date: Mon, 16 Feb 2026 13:44:28 +1000 Message-ID: <20260216034432.23912-10-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260216034432.23912-1-richard.henderson@linaro.org> References: <20260216034432.23912-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::42d; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1771213557342158500 Content-Type: text/plain; charset="utf-8" Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- target/arm/kvm.c | 54 +++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 51 insertions(+), 3 deletions(-) diff --git a/target/arm/kvm.c b/target/arm/kvm.c index ccffa40900..979265a810 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -61,6 +61,7 @@ typedef struct ARMHostCPUFeatures { uint64_t features; uint32_t target; uint32_t sve_vq_supported; + uint32_t sme_vq_supported; const char *dtb_compatible; } ARMHostCPUFeatures; =20 @@ -273,6 +274,36 @@ static uint32_t kvm_arm_sve_get_vls(int fd) return vls[0] & MAKE_64BIT_MASK(0, ARM_MAX_VQ); } =20 +static uint32_t kvm_arm_sme_get_vls(int fd) +{ + uint64_t vls[KVM_ARM64_SME_VLS_WORDS]; + struct kvm_one_reg reg =3D { + .id =3D KVM_REG_ARM64_SME_VLS, + .addr =3D (uint64_t)&vls[0], + }; + uint32_t vq =3D 0; + int ret; + + ret =3D ioctl(fd, KVM_GET_ONE_REG, ®); + if (ret) { + error_report("failed to get KVM_REG_ARM64_SME_VLS: %s", + strerror(errno)); + abort(); + } + + for (int i =3D KVM_ARM64_SME_VLS_WORDS - 1; i >=3D 0; --i) { + if (vls[i]) { + vq =3D 64 - clz64(vls[i]) + i * 64; + break; + } + } + if (vq > ARM_MAX_VQ) { + warn_report("KVM supports vector lengths larger than QEMU can enab= le"); + } + return vls[0] & MAKE_64BIT_MASK(0, ARM_MAX_VQ); +} + + static bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf) { /* Identify the feature bits corresponding to the host CPU, and @@ -282,6 +313,7 @@ static bool kvm_arm_get_host_cpu_features(ARMHostCPUFea= tures *ahcf) */ int fdarray[3]; bool sve_supported; + bool sme_supported; bool el2_supported; bool pmu_supported =3D false; uint64_t features =3D 0; @@ -302,9 +334,13 @@ static bool kvm_arm_get_host_cpu_features(ARMHostCPUFe= atures *ahcf) init.features[0] |=3D 1 << KVM_ARM_VCPU_SVE; } =20 - /* - * Ask for EL2 if supported. - */ + /* Similarly for SME... */ + sme_supported =3D kvm_check_extension(kvm_state, KVM_CAP_ARM_SME); + if (sme_supported) { + init.features[0] |=3D 1 << KVM_ARM_VCPU_SME; + } + + /* ... and EL2. */ el2_supported =3D kvm_arm_el2_supported(); if (el2_supported) { init.features[0] |=3D 1 << KVM_ARM_VCPU_HAS_EL2; @@ -449,6 +485,17 @@ static bool kvm_arm_get_host_cpu_features(ARMHostCPUFe= atures *ahcf) /* Read the set of supported vector lengths. */ arm_host_cpu_features.sve_vq_supported =3D kvm_arm_sve_get_vls= (fd); } + + if (sme_supported) { + /* + * While ID_AA64SMFR0_EL1 is always accessible, if RAZ, + * it's unused if !sme_supported. + */ + err |=3D get_host_cpu_reg(fd, ahcf, ID_AA64SMFR0_EL1_IDX); + + /* Read the set of supported vector lengths. */ + arm_host_cpu_features.sme_vq_supported =3D kvm_arm_sme_get_vls= (fd); + } } =20 kvm_arm_destroy_scratch_host_vcpu(fdarray); @@ -496,6 +543,7 @@ void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu) cpu->dtb_compatible =3D arm_host_cpu_features.dtb_compatible; cpu->isar =3D arm_host_cpu_features.isar; cpu->sve_vq.supported =3D arm_host_cpu_features.sve_vq_supported; + cpu->sme_vq.supported =3D arm_host_cpu_features.sme_vq_supported; env->features =3D arm_host_cpu_features.features; } =20 --=20 2.43.0