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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) 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> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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-Daudé --- 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(bool secure) } #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); } +bool arm_hw_accel_cpu_feature_supported(enum arm_features feat, bool can_emulate) +{ + 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) } } +bool arm_hw_accel_cpu_feature_supported(enum arm_features feat, bool can_emulate) +{ + 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); -- 2.49.0