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Fri, 27 Feb 2026 00:01:35 -0800 (PST) From: Manos Pitsidianakis Date: Fri, 27 Feb 2026 10:01:28 +0200 Subject: [PATCH v4 2/2] hvf/arm: expose FEAT_SME2 to guest if available MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260227-sme2-hvf-v4-2-3dae31a1876d@linaro.org> References: <20260227-sme2-hvf-v4-0-3dae31a1876d@linaro.org> In-Reply-To: <20260227-sme2-hvf-v4-0-3dae31a1876d@linaro.org> To: qemu-devel@nongnu.org Cc: Richard Henderson , =?utf-8?q?Phil_Mathieu-Daud=C3=A9?= , Alexander Graf , Mads Ynddal , Peter Maydell , qemu-arm@nongnu.org, Mohamed Mediouni , Manos Pitsidianakis X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3015; i=manos.pitsidianakis@linaro.org; h=from:subject:message-id; bh=e/vsNryygBBM3ClV3NdyZUVw3FsFJZH7OZZmrgohHKc=; b=LS0tLS1CRUdJTiBQR1AgTUVTU0FHRS0tLS0tCgpvd0VCYlFLUy9aQU5Bd0FLQVhjcHgzQi9mZ 25RQWNzbVlnQnBvVTliMnJnNG55RjJMZHRDYUhsMjNHUzdVMk0zCjZqNUMzQTJIK0d4QmN3Smc5 ZENKQWpNRUFBRUtBQjBXSVFUTVhCdE9SS0JXODRkd0hSQjNLY2R3ZjM0SjBBVUMKYWFGUFd3QUt DUkIzS2Nkd2YzNEowQ3BvRC8wY25iQ014NElEdGF1dSthZldmVlJ1ZkMrOE8wZDQ4RTR2Rk4xbg p4bjNhL3A1Z0huUi92MjhBQmlKSkxTajdxYm9SZERZdnRlZjBWVnpXdk1halBaWVROZjlKOFRsU 2FrL2tiNzA3ClVsTE5hZGgwWmhvbHptMEJNV3lCdERRaFFHV05CeStHdUc4ZVNFZVFaTithei9V T24yQ1c5eHpnOXI2U3ZQcTEKMHV4ZDYycHBaOWIyeHpXbUpONjVuUTlidTVSZWtWcS9FcGRjT0x Ub3FrN1dJdzJVMThiWGlsNHkrUUJVdTY2VAowZFpFdU9mN2J0NThRSVRIVWN6SE12YS9Ld1N1Tn NqZnh4c3VUYjZpMy8vTW1JclU3b2VTWlExUGVtNW1pQnVxCm1kOWluTEs0Zytvd1V3M1gvajJMY 2VpT25yeWhXa016QjNDd0MwZ2RtVDFRYlNPeHRvQXQ2M2VWbmQzWlZscFUKUTZmZW54NHhDRTJ5 RDdtdkdHV0V0UW9lUnRQZGJ1V1JXdGpBZUtIQlpYOVVxcWFzMDR6OWNBM0MvTGlxekpCRgpuTWs 2anJmOVVqcDdYcFovMno0eVp5ZXlVbzNkMHlkUmFxOGFzRkEwcXlBbnROYjNtK0ZjV2xqbFpvMk pkTGZuCnJlTHVhaEVXTDFHZ2JIUHk1RFBKN0psK0ExQ1o1bW1zNTdqNWhFSWVoMVl3MisvSkgwc 1AzcEpGM0xtSkswL1UKTURUdkd3U2sxalU5VnZ3cVg5Vk5ZRC9sczZXbmgyanhEd0hlbzF6ekVl S3A2clNGNXJPKy9YQ1dCMVVFYnkwagpMMWx3Z24vYlpUem0vVE9XZ0sxYmVWUWx1M2R0eGdXOUk zZG1DL1RXdTBnQU5Xa3Z6b2dlRHd0RW1NUjZidVlBCjZKSjlFdz09Cj1sMzBJCi0tLS0tRU5EIF BHUCBNRVNTQUdFLS0tLS0K X-Developer-Key: i=manos.pitsidianakis@linaro.org; a=openpgp; fpr=7C721DF9DB3CC7182311C0BF68BC211D47B421E1 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=2a00:1450:4864:20::333; envelope-from=manos.pitsidianakis@linaro.org; helo=mail-wm1-x333.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: 1772179363252158500 Starting from M4 cores and MacOS 15.2 SDK, HVF can virtualise FEAT_SME2. Signed-off-by: Manos Pitsidianakis --- target/arm/hvf/hvf.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c index ce62f8c97876e3fd948fad96df631f1b53db5e67..23e6de223e2ca63dc952e24889a= 9326d3bba3985 100644 --- a/target/arm/hvf/hvf.c +++ b/target/arm/hvf/hvf.c @@ -315,6 +315,7 @@ typedef struct ARMHostCPUFeatures { uint64_t features; uint64_t midr; uint32_t reset_sctlr; + uint32_t sme_vq_supported; const char *dtb_compatible; } ARMHostCPUFeatures; =20 @@ -1117,18 +1118,18 @@ static bool hvf_arm_get_host_cpu_features(ARMHostCP= UFeatures *ahcf) =20 clamp_id_aa64mmfr0_parange_to_ipa_size(&host_isar); =20 - /* - * Disable SME, which is not properly handled by QEMU hvf yet. - * To allow this through we would need to: - * - make sure that the SME state is correctly handled in the - * get_registers/put_registers functions - * - get the SME-specific CPU properties to work with accelerators - * other than TCG - * - fix any assumptions we made that SME implies SVE (since - * on the M4 there is SME but not SVE) - */ - SET_IDREG(&host_isar, ID_AA64PFR1, - GET_IDREG(&host_isar, ID_AA64PFR1) & ~R_ID_AA64PFR1_SME_MASK= ); + if (hvf_arm_sme2_supported()) { + t =3D GET_IDREG(&host_isar, ID_AA64PFR1); + t =3D FIELD_DP64(t, ID_AA64PFR1, SME, 2); /* FEAT_SME2 */ + SET_IDREG(&host_isar, ID_AA64PFR1, t); + + t =3D GET_IDREG(&host_isar, ID_AA64SMFR0); + t =3D FIELD_DP64(t, ID_AA64SMFR0, SMEVER, 1); /* FEAT_SME2 */ + SET_IDREG(&host_isar, ID_AA64SMFR0, t); + } else { + SET_IDREG(&host_isar, ID_AA64PFR1, + GET_IDREG(&host_isar, ID_AA64PFR1) & ~R_ID_AA64PFR1_SME_MA= SK); + } =20 ahcf->isar =3D host_isar; =20 @@ -1144,6 +1145,8 @@ static bool hvf_arm_get_host_cpu_features(ARMHostCPUF= eatures *ahcf) */ ahcf->reset_sctlr |=3D 0x00800000; =20 + ahcf->sme_vq_supported =3D hvf_arm_sme2_supported() ? hvf_arm_sme2_get= _svl() : 0; + /* Make sure we don't advertise AArch32 support for EL0/EL1 */ if ((GET_IDREG(&host_isar, ID_AA64PFR0) & 0xff) !=3D 0x11) { return false; @@ -1195,6 +1198,7 @@ void hvf_arm_set_cpu_features_from_host(ARMCPU *cpu) cpu->env.features =3D arm_host_cpu_features.features; cpu->midr =3D arm_host_cpu_features.midr; cpu->reset_sctlr =3D arm_host_cpu_features.reset_sctlr; + cpu->sme_vq.supported =3D arm_host_cpu_features.sme_vq_supported; } =20 void hvf_arch_vcpu_destroy(CPUState *cpu) @@ -1335,6 +1339,7 @@ int hvf_arch_init_vcpu(CPUState *cpu) arm_cpu->isar.idregs[ID_AA64MMFR0_EL1_IDX]); assert_hvf_ok(ret); =20 + aarch64_add_sme_properties(OBJECT(cpu)); return 0; } =20 --=20 2.47.3