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Wed, 05 Mar 2025 11:39:19 -0500 X-MC-Unique: t-Y3nSZwNTSOUF1lVM-p6Q-1 X-Mimecast-MFC-AGG-ID: t-Y3nSZwNTSOUF1lVM-p6Q_1741192757 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A00A61956059; Wed, 5 Mar 2025 16:39:16 +0000 (UTC) Received: from gondolin.redhat.com (unknown [10.67.24.9]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 146F81956095; Wed, 5 Mar 2025 16:38:59 +0000 (UTC) From: Cornelia Huck To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, kvmarm@lists.linux.dev, peter.maydell@linaro.org, richard.henderson@linaro.org, alex.bennee@linaro.org, maz@kernel.org, oliver.upton@linux.dev, sebott@redhat.com, shameerali.kolothum.thodi@huawei.com, armbru@redhat.com, berrange@redhat.com, abologna@redhat.com, jdenemar@redhat.com, agraf@csgraf.de Cc: shahuang@redhat.com, mark.rutland@arm.com, philmd@linaro.org, pbonzini@redhat.com, Cornelia Huck Subject: [PATCH v2 02/14] arm/kvm: add accessors for storing host features into idregs Date: Wed, 5 Mar 2025 17:38:07 +0100 Message-ID: <20250305163819.2477553-3-cohuck@redhat.com> In-Reply-To: <20250305163819.2477553-1-cohuck@redhat.com> References: <20250305163819.2477553-1-cohuck@redhat.com> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Signed-off-by: Cornelia Huck --- target/arm/cpu-sysregs.h | 3 +++ target/arm/cpu64.c | 25 +++++++++++++++++++++++++ target/arm/kvm.c | 12 ++++++++++++ 3 files changed, 40 insertions(+) diff --git a/target/arm/cpu-sysregs.h b/target/arm/cpu-sysregs.h index de09ebae91a5..54a4fadbf0c1 100644 --- a/target/arm/cpu-sysregs.h +++ b/target/arm/cpu-sysregs.h @@ -128,4 +128,7 @@ static const uint32_t id_register_sysreg[NUM_ID_IDX] = { [CTR_EL0_IDX] = SYS_CTR_EL0, }; +int get_sysreg_idx(ARMSysRegs sysreg); +uint64_t idregs_sysreg_to_kvm_reg(ARMSysRegs sysreg); + #endif /* ARM_CPU_SYSREGS_H */ diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c index 8188ede5cc8a..9ae78253cb34 100644 --- a/target/arm/cpu64.c +++ b/target/arm/cpu64.c @@ -736,6 +736,31 @@ static void aarch64_a53_initfn(Object *obj) define_cortex_a72_a57_a53_cp_reginfo(cpu); } +#ifdef CONFIG_KVM + +int get_sysreg_idx(ARMSysRegs sysreg) +{ + int i; + + for (i = 0; i < NUM_ID_IDX; i++) { + if (id_register_sysreg[i] == sysreg) { + return i; + } + } + return -1; +} + +uint64_t idregs_sysreg_to_kvm_reg(ARMSysRegs sysreg) +{ + return ARM64_SYS_REG((sysreg & CP_REG_ARM64_SYSREG_OP0_MASK) >> CP_REG_ARM64_SYSREG_OP0_SHIFT, + (sysreg & CP_REG_ARM64_SYSREG_OP1_MASK) >> CP_REG_ARM64_SYSREG_OP1_SHIFT, + (sysreg & CP_REG_ARM64_SYSREG_CRN_MASK) >> CP_REG_ARM64_SYSREG_CRN_SHIFT, + (sysreg & CP_REG_ARM64_SYSREG_CRM_MASK) >> CP_REG_ARM64_SYSREG_CRM_SHIFT, + (sysreg & CP_REG_ARM64_SYSREG_OP2_MASK) >> CP_REG_ARM64_SYSREG_OP2_SHIFT); +} + +#endif + static void aarch64_host_initfn(Object *obj) { #if defined(CONFIG_KVM) diff --git a/target/arm/kvm.c b/target/arm/kvm.c index da30bdbb2349..2381c87e4ba1 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -246,6 +246,18 @@ static bool kvm_arm_pauth_supported(void) kvm_check_extension(kvm_state, KVM_CAP_ARM_PTRAUTH_GENERIC)); } +/* read a sysreg value and store it in the idregs */ +static int get_host_cpu_reg(int fd, ARMHostCPUFeatures *ahcf, ARMIDRegisterIdx index) +{ + uint64_t *reg; + int ret; + + reg = &ahcf->isar.idregs[index]; + ret = read_sys_reg64(fd, reg, + idregs_sysreg_to_kvm_reg(id_register_sysreg[index])); + return ret; +} + static bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf) { /* Identify the feature bits corresponding to the host CPU, and -- 2.48.1