From nobody Mon Feb 9 17:56:48 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1CADC6FD1D for ; Thu, 30 Mar 2023 22:44:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231192AbjC3Won (ORCPT ); Thu, 30 Mar 2023 18:44:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38530 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230452AbjC3Woc (ORCPT ); Thu, 30 Mar 2023 18:44:32 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C053EB4D for ; Thu, 30 Mar 2023 15:44:16 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id j11-20020a25230b000000b00b6871c296bdso19999593ybj.5 for ; Thu, 30 Mar 2023 15:44:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1680216255; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=VWrmux7hI3Vkehq4mVAPcOxXo9VZdrd7e2opoA1ab28=; b=i0OxGwAlYv/8fg/xl8vCs3bv85Ct5kGC4I40aiP6zlxrZNla0vcd+Dt/3ziZ5Z64R2 wwp0Kbij3HOATOhSkDXKKfOwlOYFxGiB/hDggLJkv/04GPSI/57NXaFnJDj78tlbjbfH zHFU86siWEoZyPUZgnPxbdTYoIqqHSKeqWKBcgWSOpw+XgqPbgWADD37A8W3toAbs1MC dcbVAQ8sl2OQzJt8IRgKDF9IS1AH/mRcNJT2VSC6zxmHCHPlb2t6r5bf+IqTbNLbJCvs AKYlZU4JbVRQXfpRwnjWx/H9f5H7hruDbA3ZWfT7nOqwawvT9S9fX+9ZMwDadcKocd2n Mp7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680216255; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=VWrmux7hI3Vkehq4mVAPcOxXo9VZdrd7e2opoA1ab28=; b=RVzgAixCb9jPG3uNMee9uhuhUhXWm6QB7+6C3z54jfmoQ7wc/ewPqOmjK8/DEKhd2C n11ASwFje/e7bGAglmp/GCfC7DzVIpdclQj84rm4IbgtCEcJ+9J585HH7uMQ9tWfWoBd 8gVA3zEG5KQp7DClM3L5Oa7JGADBjmUlvo21jTa9Roi6qFRWNwKOuAJVr+5dZNZEhzV3 6NDSrCP+zMFeVfQ8ctFb/mE7DnDZ68zEW1j7T+VMX9UkLJsLmfNpZWXka5RxNXTU7jgK Xx0+vrRSq/PFFYZrQgUxFubnQpZzO3Cv9d9EUdB+27P0R5qhX+NINfHy/W3FOfkc0BnB ZTxg== X-Gm-Message-State: AAQBX9f2gM3LeQzhHlgyPMcj8oSjBmEZ0iVngpXJQSqVKrixnzKuqRQh hEqYVJyDLyGsul0GlQ4sZGE/2TDnzWyE X-Google-Smtp-Source: AKy350bcwJ9FD9dZGNvGTPVwMDF1LwhIoUS2S5HjV59ByCSD7PADcxzbUOioxj2xH08uJn1CEJhYNkbKLaF/ X-Received: from davidai2.mtv.corp.google.com ([2620:15c:211:201:c162:24e8:ec5e:d520]) (user=davidai job=sendgmr) by 2002:a25:680e:0:b0:b78:3a15:e6fe with SMTP id d14-20020a25680e000000b00b783a15e6femr12135986ybc.2.1680216255549; Thu, 30 Mar 2023 15:44:15 -0700 (PDT) Date: Thu, 30 Mar 2023 15:43:37 -0700 In-Reply-To: <20230330224348.1006691-1-davidai@google.com> Mime-Version: 1.0 References: <20230330224348.1006691-1-davidai@google.com> X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230330224348.1006691-3-davidai@google.com> Subject: [RFC PATCH 2/6] kvm: arm64: Add support for get_cur_cpufreq service From: David Dai To: Paolo Bonzini , Jonathan Corbet , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Pieralisi , Sudeep Holla Cc: David Dai , Saravana Kannan , kernel-team@android.com, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This service allows guests to query the host for frequency of the CPU that the vCPU is currently running on. Co-developed-by: Saravana Kannan Signed-off-by: Saravana Kannan Signed-off-by: David Dai --- Documentation/virt/kvm/api.rst | 8 +++++++ .../virt/kvm/arm/get_cur_cpufreq.rst | 21 +++++++++++++++++++ Documentation/virt/kvm/arm/index.rst | 1 + arch/arm64/include/uapi/asm/kvm.h | 1 + arch/arm64/kvm/arm.c | 1 + arch/arm64/kvm/hypercalls.c | 18 ++++++++++++++++ include/linux/arm-smccc.h | 7 +++++++ include/uapi/linux/kvm.h | 1 + tools/arch/arm64/include/uapi/asm/kvm.h | 1 + 9 files changed, 59 insertions(+) create mode 100644 Documentation/virt/kvm/arm/get_cur_cpufreq.rst diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 62de0768d6aa..b0ff0ad700bf 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -8380,6 +8380,14 @@ structure. When getting the Modified Change Topology Report value, the attr->addr must point to a byte where the value will be stored or retrieved from. =20 +8.40 KVM_CAP_GET_CUR_CPUFREQ +------------------------ + +:Architectures: arm64 + +This capability indicates that KVM supports getting the +frequency of the current CPU that the vCPU thread is running on. + 9. Known KVM API problems =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D =20 diff --git a/Documentation/virt/kvm/arm/get_cur_cpufreq.rst b/Documentation= /virt/kvm/arm/get_cur_cpufreq.rst new file mode 100644 index 000000000000..06e0ed5b3868 --- /dev/null +++ b/Documentation/virt/kvm/arm/get_cur_cpufreq.rst @@ -0,0 +1,21 @@ +.. SPDX-License-Identifier: GPL-2.0 + +get_cur_cpufreq support for arm/arm64 +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D + +Get_cur_cpufreq support is used to get current frequency(in KHz) of the +current CPU that the vCPU thread is running on. + +* ARM_SMCCC_VENDOR_HYP_KVM_GET_CUR_CPUFREQ_FUNC_ID: 0x86000040 + +This hypercall uses the SMC32/HVC32 calling convention: + +ARM_SMCCC_VENDOR_HYP_KVM_GET_CUR_CPUFREQ_FUNC_ID + =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + Function ID: (uint32) 0x86000040 + Return Values: (int32) NOT_SUPPORTED(-1) on error, or + (uint32) Frequency in KHz of current CPU that the + vCPU thread is running on. + Endianness: Must be the same endianness + as the host. + =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D diff --git a/Documentation/virt/kvm/arm/index.rst b/Documentation/virt/kvm/= arm/index.rst index e84848432158..47afc5c1f24a 100644 --- a/Documentation/virt/kvm/arm/index.rst +++ b/Documentation/virt/kvm/arm/index.rst @@ -11,3 +11,4 @@ ARM hypercalls pvtime ptp_kvm + get_cur_cpufreq diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/as= m/kvm.h index f8129c624b07..ed8b63e91bdc 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -367,6 +367,7 @@ enum { enum { KVM_REG_ARM_VENDOR_HYP_BIT_FUNC_FEAT =3D 0, KVM_REG_ARM_VENDOR_HYP_BIT_PTP =3D 1, + KVM_REG_ARM_VENDOR_HYP_BIT_GET_CUR_CPUFREQ =3D 2, #ifdef __KERNEL__ KVM_REG_ARM_VENDOR_HYP_BMAP_BIT_COUNT, #endif diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 3bd732eaf087..f960b136c611 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -220,6 +220,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long = ext) case KVM_CAP_VCPU_ATTRIBUTES: case KVM_CAP_PTP_KVM: case KVM_CAP_ARM_SYSTEM_SUSPEND: + case KVM_CAP_GET_CUR_CPUFREQ: r =3D 1; break; case KVM_CAP_SET_GUEST_DEBUG2: diff --git a/arch/arm64/kvm/hypercalls.c b/arch/arm64/kvm/hypercalls.c index 5da884e11337..b3f4b90c024b 100644 --- a/arch/arm64/kvm/hypercalls.c +++ b/arch/arm64/kvm/hypercalls.c @@ -3,6 +3,9 @@ =20 #include #include +#include +#include +#include =20 #include =20 @@ -16,6 +19,15 @@ #define KVM_ARM_SMCCC_VENDOR_HYP_FEATURES \ GENMASK(KVM_REG_ARM_VENDOR_HYP_BMAP_BIT_COUNT - 1, 0) =20 +static void kvm_sched_get_cur_cpufreq(struct kvm_vcpu *vcpu, u64 *val) +{ + unsigned long ret_freq; + + ret_freq =3D cpufreq_get(task_cpu(current)); + + val[0] =3D ret_freq; +} + static void kvm_ptp_get_time(struct kvm_vcpu *vcpu, u64 *val) { struct system_time_snapshot systime_snapshot; @@ -116,6 +128,9 @@ static bool kvm_hvc_call_allowed(struct kvm_vcpu *vcpu,= u32 func_id) case ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID: return test_bit(KVM_REG_ARM_VENDOR_HYP_BIT_PTP, &smccc_feat->vendor_hyp_bmap); + case ARM_SMCCC_VENDOR_HYP_KVM_GET_CUR_CPUFREQ_FUNC_ID: + return test_bit(KVM_REG_ARM_VENDOR_HYP_BIT_GET_CUR_CPUFREQ, + &smccc_feat->vendor_hyp_bmap); default: return kvm_hvc_call_default_allowed(func_id); } @@ -213,6 +228,9 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) case ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID: kvm_ptp_get_time(vcpu, val); break; + case ARM_SMCCC_VENDOR_HYP_KVM_GET_CUR_CPUFREQ_FUNC_ID: + kvm_sched_get_cur_cpufreq(vcpu, val); + break; case ARM_SMCCC_TRNG_VERSION: case ARM_SMCCC_TRNG_FEATURES: case ARM_SMCCC_TRNG_GET_UUID: diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h index 220c8c60e021..e15f1bdcf3f1 100644 --- a/include/linux/arm-smccc.h +++ b/include/linux/arm-smccc.h @@ -112,6 +112,7 @@ /* KVM "vendor specific" services */ #define ARM_SMCCC_KVM_FUNC_FEATURES 0 #define ARM_SMCCC_KVM_FUNC_PTP 1 +#define ARM_SMCCC_KVM_FUNC_GET_CUR_CPUFREQ 64 #define ARM_SMCCC_KVM_FUNC_FEATURES_2 127 #define ARM_SMCCC_KVM_NUM_FUNCS 128 =20 @@ -138,6 +139,12 @@ #define KVM_PTP_VIRT_COUNTER 0 #define KVM_PTP_PHYS_COUNTER 1 =20 +#define ARM_SMCCC_VENDOR_HYP_KVM_GET_CUR_CPUFREQ_FUNC_ID \ + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ + ARM_SMCCC_SMC_32, \ + ARM_SMCCC_OWNER_VENDOR_HYP, \ + ARM_SMCCC_KVM_FUNC_GET_CUR_CPUFREQ) + /* Paravirtualised time calls (defined by ARM DEN0057A) */ #define ARM_SMCCC_HV_PV_TIME_FEATURES \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index d77aef872a0a..0a1a260243bf 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1184,6 +1184,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_S390_PROTECTED_ASYNC_DISABLE 224 #define KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP 225 #define KVM_CAP_PMU_EVENT_MASKED_EVENTS 226 +#define KVM_CAP_GET_CUR_CPUFREQ 512 =20 #ifdef KVM_CAP_IRQ_ROUTING =20 diff --git a/tools/arch/arm64/include/uapi/asm/kvm.h b/tools/arch/arm64/inc= lude/uapi/asm/kvm.h index f8129c624b07..ed8b63e91bdc 100644 --- a/tools/arch/arm64/include/uapi/asm/kvm.h +++ b/tools/arch/arm64/include/uapi/asm/kvm.h @@ -367,6 +367,7 @@ enum { enum { KVM_REG_ARM_VENDOR_HYP_BIT_FUNC_FEAT =3D 0, KVM_REG_ARM_VENDOR_HYP_BIT_PTP =3D 1, + KVM_REG_ARM_VENDOR_HYP_BIT_GET_CUR_CPUFREQ =3D 2, #ifdef __KERNEL__ KVM_REG_ARM_VENDOR_HYP_BMAP_BIT_COUNT, #endif --=20 2.40.0.348.gf938b09366-goog