From patchwork Wed Mar 10 00:30:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jing Zhang X-Patchwork-Id: 12126749 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62D60C4361A for ; Wed, 10 Mar 2021 00:31:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5093E65101 for ; Wed, 10 Mar 2021 00:31:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231517AbhCJAbQ (ORCPT ); Tue, 9 Mar 2021 19:31:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231387AbhCJAap (ORCPT ); Tue, 9 Mar 2021 19:30:45 -0500 Received: from mail-ot1-x349.google.com (mail-ot1-x349.google.com [IPv6:2607:f8b0:4864:20::349]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D457BC061760 for ; Tue, 9 Mar 2021 16:30:44 -0800 (PST) Received: by mail-ot1-x349.google.com with SMTP id e2so6036030otk.8 for ; Tue, 09 Mar 2021 16:30:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=yK9iTxY4SPYbSSesaQoUo2q8UFyrEaYR8MwQ1IPWqYo=; b=rfPkmtLrdMMpGWrKUsoZrxSRse5qNsSvVuH/ikfb+KgmDu+7xZIAfNt3HpkpEZ97Az zarNFgesGm3PBWe9L+mczl93U732Ye93g+WDGdbRfWuWXNyzVXqWHfiY/cIbjAbmSvnn qj8XR13VP7p0Bd1mXfnPXjd8hkcW7rWCwxqMvFG5ZgpsriYl31doDwniGQN2KAZPgHhW vxlB4aNj0kDNyTlpdssb2f1iJVPLzBRV0BhxBl6fV30cgxVs3P6ZTphJCo9AJxEKWhqT q3oeEXUht4UienfFOrO/VUVMSHSZgd4O88fKVNlhlh4oqoZF6cpqmPjFW81N8l5UmUnd UQwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=yK9iTxY4SPYbSSesaQoUo2q8UFyrEaYR8MwQ1IPWqYo=; b=DNkDfvG1/fvPi4PEv5SOfD4KI0WZ3E651ttplwI5fBMgcmOdVMoxDZvQAXfyuqgHJI fsHsa+AnhQYboIpDsoywFTU1bwdWbimEi+I2Sb3c17V/W0TIdvjYis1A0SlsdUsQIZPM ezOaSchOMo3tedakA3kBrQ1fVrMak121t/2MgWyDAudySsy9TNMu0CbqO8hXZ/457OHm 1Z427pOKRWsvIV3XwlvbW293pJ6MVR2KY9fWyV/Y7SO8EB1b2BWvJGu9urbBemZy6d3c UA7BlhPudcNXwFKiOIEk3O6LARPR/yGLlQv3Ti5QzcwwGO8HCzQnKsRAZ1crNfEWD8pZ JnLQ== X-Gm-Message-State: AOAM531gg8w/hGi7M3LBF6853UQyDAw8pEihh/j4NnSO/BUseKU9W+pA 5+TmwlkjKIddXZjppARp32wq1gm4kqMyaPZLqg== X-Google-Smtp-Source: ABdhPJzrzyemlWc6uAKn+Q/tSsI1AAuaRP7yS778qtLKkneKHFCrPC7TFQ37cF1P4tNWDHS1FdAWFVDzeqEE0qejsg== X-Received: from jingzhangos.c.googlers.com ([fda3:e722:ac3:10:2b:ff92:c0a8:513]) (user=jingzhangos job=sendgmr) by 2002:a9d:1c7:: with SMTP id e65mr592890ote.259.1615336244140; Tue, 09 Mar 2021 16:30:44 -0800 (PST) Date: Wed, 10 Mar 2021 00:30:22 +0000 In-Reply-To: <20210310003024.2026253-1-jingzhangos@google.com> Message-Id: <20210310003024.2026253-3-jingzhangos@google.com> Mime-Version: 1.0 References: <20210310003024.2026253-1-jingzhangos@google.com> X-Mailer: git-send-email 2.30.1.766.gb4fecdf3b7-goog Subject: [RFC PATCH 2/4] KVM: stats: Define APIs for aggregated stats retrieval in binary format From: Jing Zhang To: KVM , KVM ARM , Linux MIPS , KVM PPC , Linux S390 , Linux kselftest , Paolo Bonzini , Marc Zyngier , James Morse , Julien Thierry , Suzuki K Poulose , Will Deacon , Huacai Chen , Aleksandar Markovic , Thomas Bogendoerfer , Paul Mackerras , Christian Borntraeger , Janosch Frank , David Hildenbrand , Cornelia Huck , Claudio Imbrenda , Sean Christopherson , Vitaly Kuznetsov , Jim Mattson , Peter Shier , Oliver Upton , David Rientjes , Emanuele Giuseppe Esposito Cc: Jing Zhang Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Define ioctl commands for VM/vCPU aggregated statistics data retrieval in binary format and update corresponding API documentation. The capability and ioctl are not enabled for now. No functional change intended. Signed-off-by: Jing Zhang --- Documentation/virt/kvm/api.rst | 79 ++++++++++++++++++++++++++++++++++ include/linux/kvm_host.h | 1 - include/uapi/linux/kvm.h | 60 ++++++++++++++++++++++++++ 3 files changed, 139 insertions(+), 1 deletion(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 1a2b5210cdbf..aa4b5270c966 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -4938,6 +4938,76 @@ see KVM_XEN_VCPU_SET_ATTR above. The KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST type may not be used with the KVM_XEN_VCPU_GET_ATTR ioctl. +4.131 KVM_STATS_GET_INFO +------------------------ + +:Capability: KVM_CAP_STATS_BINARY_FORM +:Architectures: all +:Type: vm ioctl, vcpu ioctl +:Parameters: struct kvm_stats_info (out) +:Returns: 0 on success, < 0 on error + +:: + + struct kvm_stats_info { + __u32 num_stats; + }; + +This ioctl is used to get the information about VM or vCPU statistics data. +The number of statistics data would be returned in field num_stats in +struct kvm_stats_info. This ioctl only needs to be called once on running +VMs on the same architecture. + +4.132 KVM_STATS_GET_NAMES +------------------------- + +:Capability: KVM_CAP_STATS_BINARY_FORM +:Architectures: all +:Type: vm ioctl, vcpu ioctl +:Parameters: struct kvm_stats_names (in/out) +:Returns: 0 on success, < 0 on error + +:: + + #define KVM_STATS_NAME_LEN 32 + struct kvm_stats_names { + __u32 size; + __u8 names[0]; + }; + +This ioctl is used to get the string names of all the statistics data for VM +or vCPU. Users must use KVM_STATS_GET_INFO to find the number of statistics. +They must allocate a buffer of the size num_stats * KVM_STATS_NAME_LEN +immediately following struct kvm_stats_names. The size field of kvm_stats_name +must contain the buffer size as an input. +The buffer can be treated like a string array, each name string is null-padded +to a size of KVM_STATS_NAME_LEN; +This ioclt only needs to be called once on running VMs on the same architecture. + +4.133 KVM_STATS_GET_DATA +------------------------- + +:Capability: KVM_CAP_STATS_BINARY_FORM +:Architectures: all +:Type: vm ioctl, vcpu ioctl +:Parameters: struct kvm_stats_data (in/out) +:Returns: 0 on success, < 0 on error + +:: + + struct kvm_stats_data { + __u32 size; + __u64 data[0]; + }; + +This ioctl is used to get the aggregated statistics data for VM or vCPU. +Users must use KVM_STATS_GET_INFO to find the number of statistics. +They must allocate a buffer of the appropriate size num_stats * sizeof(data[0]) +immediately following struct kvm_stats_data. The size field of kvm_stats_data +must contain the buffer size as an input. +The data buffer 1-1 maps to name strings buffer in sequential order. +This ioctl is usually called periodically to pull statistics data. + 5. The kvm_run structure ======================== @@ -6721,3 +6791,12 @@ vcpu_info is set. The KVM_XEN_HVM_CONFIG_RUNSTATE flag indicates that the runstate-related features KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR/_CURRENT/_DATA/_ADJUST are supported by the KVM_XEN_VCPU_SET_ATTR/KVM_XEN_VCPU_GET_ATTR ioctls. + +8.31 KVM_CAP_STATS_BINARY_FORM +------------------------------ + +:Architectures: all + +This capability indicates that KVM supports retrieving aggregated statistics +data in binary format with corresponding VM/VCPU ioctl KVM_STATS_GET_INFO, +KVM_STATS_GET_NAMES and KVM_STATS_GET_DATA. diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 1ea297458306..f2dabf457717 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1164,7 +1164,6 @@ static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa) #define VM_STAT_COUNT (sizeof(struct kvm_vm_stat)/sizeof(ulong)) #define VCPU_STAT_COUNT (sizeof(struct kvm_vcpu_stat)/sizeof(u64)) -#define KVM_STATS_NAME_LEN 32 /* Make sure it is synced with fields in struct kvm_vm_stat. */ extern const char kvm_vm_stat_strings[][KVM_STATS_NAME_LEN]; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index f6afee209620..ad185d4c5e42 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1078,6 +1078,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_DIRTY_LOG_RING 192 #define KVM_CAP_X86_BUS_LOCK_EXIT 193 #define KVM_CAP_PPC_DAWR1 194 +#define KVM_CAP_STATS_BINARY_FORM 195 #ifdef KVM_CAP_IRQ_ROUTING @@ -1853,4 +1854,63 @@ struct kvm_dirty_gfn { #define KVM_BUS_LOCK_DETECTION_OFF (1 << 0) #define KVM_BUS_LOCK_DETECTION_EXIT (1 << 1) +/* Available with KVM_CAP_STATS_BINARY_FORM */ + +#define KVM_STATS_NAME_LEN 32 + +/** + * struct kvm_stats_info - statistics information + * + * Used as parameter for ioctl %KVM_STATS_GET_INFO. + * + * @num_stats: On return, the number of statistics data of vm or vcpu. + * + */ +struct kvm_stats_info { + __u32 num_stats; +}; + +/** + * struct kvm_stats_names - string list of statistics names + * + * Used as parameter for ioctl %KVM_STATS_GET_NAMES. + * + * @size: Input from user, indicating the size of buffer after the struture. + * @names: Buffer of name string list for vm or vcpu. Each string is + * null-padded to a size of %KVM_STATS_NAME_LEN. + * + * Users must use %KVM_STATS_GET_INFO to find the number of + * statistics. They must allocate a buffer of the appropriate + * size (>= &struct kvm_stats_info @num_stats * %KVM_STATS_NAME_LEN) + * immediately following this struture. + */ +struct kvm_stats_names { + __u32 size; + __u8 names[0]; +}; + +/** + * struct kvm_stats_data - statistics data array + * + * Used as parameter for ioctl %KVM_STATS_GET_DATA. + * + * @size: Input from user, indicating the size of buffer after the struture. + * @data: Buffer of statistics data for vm or vcpu. + * + * Users must use %KVM_STATS_GET_INFO to find the number of + * statistics. They must allocate a buffer of the appropriate + * size (>= &struct kvm_stats_info @num_stats * sizeof(@data[0]) + * immediately following this structure. + * &struct kvm_stats_names @names 1-1 maps to &structkvm_stats_data + * @data in sequential order. + */ +struct kvm_stats_data { + __u32 size; + __u64 data[0]; +}; + +#define KVM_STATS_GET_INFO _IOR(KVMIO, 0xcc, struct kvm_stats_info) +#define KVM_STATS_GET_NAMES _IOR(KVMIO, 0xcd, struct kvm_stats_names) +#define KVM_STATS_GET_DATA _IOR(KVMIO, 0xce, struct kvm_stats_data) + #endif /* __LINUX_KVM_H */