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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-459dcb86d6asm311879855e9.5.2025.08.11.10.06.39 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 11 Aug 2025 10:06:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1754932001; x=1755536801; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=87BQk4WDEzqTJD4OBgNMj09kaieo6h7xgFKV69c1SWc=; b=QJxxL7eir4zdIy1w280OZ+mobj1czlYrRolLcSdbDYRFPdBTfJnIaEIESbZUPvQudl 2hoRL/cuvvGJobGmF+rlSht4zubO3ZJ3k/si+VnZYvJZPv3ei70HFgoAmP8hbfUNAEWm 2HJpeQmrQGV6P33g7eI8eTZBsOJKqUZql2Pq121/O2aWEyIOga5Lv9mDr1/Jm3OqRenh GKMrCMfsWyAZgHyu4rvgBYFakRxlA8FezMfGnaIVKVeUHti2ZKp1aQVClhZ0PQLrjDBf ijhpTnq2xi3+BvvDvsv97Q832Zge3OKnn7gDVhPMfMrCwMRCNrW4GkgeLaQiz09jrhuA wg7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754932001; x=1755536801; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=87BQk4WDEzqTJD4OBgNMj09kaieo6h7xgFKV69c1SWc=; b=EQlHzWE7ZissrIgzgQI7Aqk7bcuUCk4B0k0/KMu1e8sIQg+IZ0jH1cZih/7IQmlQAk 3RZ7in+yV6lXCR9faM4H1N7wSDNq+WMiHkONQfT/M4nQLE9MabDbR/L+lIxyqq5UyNiw W9XBx1biEAY3AdYsYS8KdcbMSk8O0ZGe6Id910toDjZXNsgxAptNmHM4wtsRIT7LOVT0 jIJRcK9e5DkVMuSNMxFdafUAciLapP0hpvviqMofpto98QZyDjlXcdoefZux0hxXIP8w cNo6qPix1wuFqu0tBP7R6ibIbxzyrtj2s1Xqwn8SmaNL33B7jCciR1AwAWwDRj/s8DQc eS7A== X-Gm-Message-State: AOJu0Yyc2kIf9bOfWX6q6JxD2pmhsMeqDc8/rWYEdhjQsqdZeDgDultr 7IdkERmliDDSyI+VkgzApfgddrJ8MIuIYx+g2GuIVzKH0Ft9/TOv/67aBjWMBNC/FVNnECM3ufV oxLCl X-Gm-Gg: ASbGncvkaet7ldUtMFRWtRhh7KEijn2LWmMI3FZ04d5jEeaMKLor+ehPwPEur0DXrIc Qd/kYcTScn6tUgzzbMFJMXZasPOyehOVMv3lB5yq+6P6gp1Pvm6oIURE8FD9vSekKEMkW0cHncj LeDZlbXvIuaZgzlS5Rh6X/jRMZreoGNFK7TlWde/9eksSFOTO7Df6pp6u0r3Y/2AZxtlEqyva+K pMWrEb9vM6Dm/job7vfK14Lav/LbMQ9ey4QCfYgbjdE0hOvU4GJjV3ItfMwettbEKqGgeK4l3Fq uNuAeyM28citO3bPxhKL0btDbD0o8+1vf6sNRP9WG3DAI0RNQO/6mT7ltA0vts7sZnHVCwLKLtZ 6pdubQCIHnklZcsSjWiFoZRThjCDygPNLGct8EE5+hBiG80W3tQtwaNuEsnLWsjYCS/abdXcd+M vHhVA6FVw= X-Google-Smtp-Source: AGHT+IHaTwICaPRcKARdQT0mw9k+cJoRSQtgKTQLc8LGODj1lp8+nI2sBInpFOyWKeNcBONwY9kYnw== X-Received: by 2002:a05:600c:45c7:b0:459:e398:ed80 with SMTP id 5b1f17b1804b1-459f4f3b70dmr100697845e9.32.1754932001105; Mon, 11 Aug 2025 10:06:41 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Miguel Luis , Richard Henderson , kvm@vger.kernel.org, Peter Maydell , Paolo Bonzini , Haibo Xu , Mohamed Mediouni , Mark Burton , Alexander Graf , Claudio Fontana , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Mads Ynddal , Eric Auger , qemu-arm@nongnu.org, Cameron Esfahani , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [RFC PATCH 05/11] target/arm: Introduce arm_hw_accel_cpu_feature_supported() Date: Mon, 11 Aug 2025 19:06:05 +0200 Message-ID: <20250811170611.37482-6-philmd@linaro.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250811170611.37482-1-philmd@linaro.org> References: <20250811170611.37482-1-philmd@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=2a00:1450:4864:20::32d; envelope-from=philmd@linaro.org; helo=mail-wm1-x32d.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=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: 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: 1754932117495116600 Introduce arm_hw_accel_cpu_feature_supported() helper, an accelerator implementation to return whether a ARM feature is supported by host hardware. Allow optional fallback on emulation. Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- target/arm/cpu.h | 12 ++++++++++++ target/arm/hvf/hvf.c | 20 ++++++++++++++++++++ target/arm/kvm.c | 22 ++++++++++++++++++++++ 3 files changed, 54 insertions(+) diff --git a/target/arm/cpu.h b/target/arm/cpu.h index dc9b6dce4c9..5136c4caabf 100644 --- a/target/arm/cpu.h +++ b/target/arm/cpu.h @@ -2507,6 +2507,18 @@ static inline ARMSecuritySpace arm_secure_to_space(b= ool secure) } =20 #if !defined(CONFIG_USER_ONLY) + +/** + * arm_hw_accel_cpu_feature_supported: + * @feat: Feature to test for support + * @can_emulate: Whether Allow to fall back to emulation if @feat is not + * supported by hardware accelerator + * + * Hardware accelerator implementation of cpu_feature_supported(). + */ +bool arm_hw_accel_cpu_feature_supported(enum arm_features feat, + bool can_emulate); + /** * arm_security_space_below_el3: * @env: cpu context diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c index 81dc4df686d..5174973991f 100644 --- a/target/arm/hvf/hvf.c +++ b/target/arm/hvf/hvf.c @@ -964,6 +964,26 @@ uint32_t hvf_arm_get_max_ipa_bit_size(void) return round_down_to_parange_bit_size(max_ipa_size); } =20 +bool arm_hw_accel_cpu_feature_supported(enum arm_features feat, bool can_e= mulate) +{ + if (!hvf_enabled()) { + return false; + } + switch (feat) { + case ARM_FEATURE_V8: + case ARM_FEATURE_NEON: + case ARM_FEATURE_AARCH64: + case ARM_FEATURE_PMU: + case ARM_FEATURE_GENERIC_TIMER: + return true; + case ARM_FEATURE_EL2: + case ARM_FEATURE_EL3: + return false; + default: + g_assert_not_reached(); + } +} + void hvf_arm_set_cpu_features_from_host(ARMCPU *cpu) { if (!arm_host_cpu_features.dtb_compatible) { diff --git a/target/arm/kvm.c b/target/arm/kvm.c index 66723448554..82853e68d8d 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -1771,6 +1771,28 @@ void kvm_arm_steal_time_finalize(ARMCPU *cpu, Error = **errp) } } =20 +bool arm_hw_accel_cpu_feature_supported(enum arm_features feat, bool can_e= mulate) +{ + if (!kvm_enabled()) { + return false; + } + switch (feat) { + case ARM_FEATURE_V8: + case ARM_FEATURE_NEON: + case ARM_FEATURE_AARCH64: + case ARM_FEATURE_GENERIC_TIMER: + return true; + case ARM_FEATURE_PMU: + return kvm_arm_pmu_supported(); + case ARM_FEATURE_EL2: + return kvm_arm_el2_supported(); + case ARM_FEATURE_EL3: + return false; + default: + g_assert_not_reached(); + } +} + bool kvm_arm_aarch32_supported(void) { return kvm_check_extension(kvm_state, KVM_CAP_ARM_EL1_32BIT); --=20 2.49.0