From patchwork Wed Mar 10 00:30:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jing Zhang X-Patchwork-Id: 12126747 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 34A22C432C3 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 1F1CD65105 for ; Wed, 10 Mar 2021 00:31:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231402AbhCJAbR (ORCPT ); Tue, 9 Mar 2021 19:31:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231429AbhCJAap (ORCPT ); Tue, 9 Mar 2021 19:30:45 -0500 Received: from mail-il1-x14a.google.com (mail-il1-x14a.google.com [IPv6:2607:f8b0:4864:20::14a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C2FDAC061760 for ; Tue, 9 Mar 2021 16:30:45 -0800 (PST) Received: by mail-il1-x14a.google.com with SMTP id s13so11568520ilp.3 for ; Tue, 09 Mar 2021 16:30:45 -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=HYwIHVMurXa3R6as3OvUxWmJFUBMLjiRzzhIiiKP4ME=; b=KlgzRB+CEZgxcFGOn//lNka3ixGNj1ZMzKq7WAvbwDFq3xRkgAS3kYK/JIV4nIxm/u 1FfbdecWvmBbdiWVheE3wUNE32IOWAGMhu8MeFMpPUxkNG6Ic6IXrOYz15juiE5W+eN/ UwufP8xnomHHhYJZizlFxCzJtMQMPP3AGyXKTMDhs5E9C0vskRVTcj7UvkXA1PH14ykl ft27CoJWrjGy2SvqG2c1AGionh3n73Ki0G54VqY7GeECtpHBPlD1in+kzQ+UDi+3daXg fS/ssqaH/09kuWnDkSliepIZRP1LHJvuV+kQD5aXzLq5vN3FattwTAMNMi+qTW2bJSmf Tddw== 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=HYwIHVMurXa3R6as3OvUxWmJFUBMLjiRzzhIiiKP4ME=; b=VeK1nGsaAQs+AgqgkCcJRf/OPc5GPpIbbXZL6vuY/dmJECbLnf8UxpOo/SRPoUem18 KztJ9Ht6Dcw69+Emtx7GGcYeOnbzWd1ipw2sls5xmuvbu2Hcg5bMKvvViXqoJouh15eR 3GgxqsPXiuVY9TeTmeaHhaA3wadrdnXwRgQRzB6NoIoj71Sw+6NIUoFrziTdW+da1Lb2 YFTHZnzgkP00O/ncSZxro8TOBFmJa4tj/3TajF52QA1qMrcIFQZkqH6MmVyqnhRMqNPG sxnJ4Hl48W3ucAkrQ0hBQQQFLpEw7hI26uCxf1k9oCCHiPl2nRhjDzjqhXz92+iSemma aeng== X-Gm-Message-State: AOAM530gcZuRg42QzG+3+CdBLqlHyByrNJTfgZCZPavlx565pRV6QqTO fW++5FiwZMPTsWemOmRSJINWdoLFAmBd+Ockxw== X-Google-Smtp-Source: ABdhPJza+jn+PY8flshTTgOAKq9hoAYgUHER9XS+P4s7skBsrShHEuKgzkWZTeYGcckPt9nBzOg82EPVRau5TPgGJA== X-Received: from jingzhangos.c.googlers.com ([fda3:e722:ac3:10:2b:ff92:c0a8:513]) (user=jingzhangos job=sendgmr) by 2002:a6b:6f14:: with SMTP id k20mr642440ioc.52.1615336245163; Tue, 09 Mar 2021 16:30:45 -0800 (PST) Date: Wed, 10 Mar 2021 00:30:23 +0000 In-Reply-To: <20210310003024.2026253-1-jingzhangos@google.com> Message-Id: <20210310003024.2026253-4-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 3/4] KVM: stats: Add ioctl commands to pull statistics 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 Three ioctl commands are added to support binary form statistics data retrieval. KVM_STATS_GET_INFO, KVM_STATS_GET_NAMES, KVM_STATS_GET_DATA. KVM_CAP_STATS_BINARY_FORM indicates the capability. Signed-off-by: Jing Zhang --- virt/kvm/kvm_main.c | 115 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 383df23514b9..87dd62516c8b 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3464,6 +3464,51 @@ static long kvm_vcpu_ioctl(struct file *filp, r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); break; } + case KVM_STATS_GET_INFO: { + struct kvm_stats_info stats_info; + + r = -EFAULT; + stats_info.num_stats = VCPU_STAT_COUNT; + if (copy_to_user(argp, &stats_info, sizeof(stats_info))) + goto out; + r = 0; + break; + } + case KVM_STATS_GET_NAMES: { + struct kvm_stats_names stats_names; + + r = -EFAULT; + if (copy_from_user(&stats_names, argp, sizeof(stats_names))) + goto out; + r = -EINVAL; + if (stats_names.size < VCPU_STAT_COUNT * KVM_STATS_NAME_LEN) + goto out; + + r = -EFAULT; + if (copy_to_user(argp + sizeof(stats_names), + kvm_vcpu_stat_strings, + VCPU_STAT_COUNT * KVM_STATS_NAME_LEN)) + goto out; + r = 0; + break; + } + case KVM_STATS_GET_DATA: { + struct kvm_stats_data stats_data; + + r = -EFAULT; + if (copy_from_user(&stats_data, argp, sizeof(stats_data))) + goto out; + r = -EINVAL; + if (stats_data.size < sizeof(vcpu->stat)) + goto out; + + r = -EFAULT; + argp += sizeof(stats_data); + if (copy_to_user(argp, &vcpu->stat, sizeof(vcpu->stat))) + goto out; + r = 0; + break; + } default: r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); } @@ -3695,6 +3740,7 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) case KVM_CAP_CHECK_EXTENSION_VM: case KVM_CAP_ENABLE_CAP_VM: case KVM_CAP_HALT_POLL: + case KVM_CAP_STATS_BINARY_FORM: return 1; #ifdef CONFIG_KVM_MMIO case KVM_CAP_COALESCED_MMIO: @@ -3825,6 +3871,40 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, } } +static long kvm_vm_ioctl_stats_get_data(struct kvm *kvm, unsigned long arg) +{ + void __user *argp = (void __user *)arg; + struct kvm_vcpu *vcpu; + struct kvm_stats_data stats_data; + u64 *data = NULL, *pdata; + int i, j, ret = 0; + size_t dsize = (VM_STAT_COUNT + VCPU_STAT_COUNT) * sizeof(*data); + + + if (copy_from_user(&stats_data, argp, sizeof(stats_data))) + return -EFAULT; + if (stats_data.size < dsize) + return -EINVAL; + data = kzalloc(dsize, GFP_KERNEL_ACCOUNT); + if (!data) + return -ENOMEM; + + for (i = 0; i < VM_STAT_COUNT; i++) + *(data + i) = *((ulong *)&kvm->stat + i); + + kvm_for_each_vcpu(j, vcpu, kvm) { + pdata = data + VM_STAT_COUNT; + for (i = 0; i < VCPU_STAT_COUNT; i++, pdata++) + *pdata += *((u64 *)&vcpu->stat + i); + } + + if (copy_to_user(argp + sizeof(stats_data), data, dsize)) + ret = -EFAULT; + + kfree(data); + return ret; +} + static long kvm_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -4001,6 +4081,41 @@ static long kvm_vm_ioctl(struct file *filp, r = 0; break; } + case KVM_STATS_GET_INFO: { + struct kvm_stats_info stats_info; + + r = -EFAULT; + stats_info.num_stats = VM_STAT_COUNT + VCPU_STAT_COUNT; + if (copy_to_user(argp, &stats_info, sizeof(stats_info))) + goto out; + r = 0; + break; + } + case KVM_STATS_GET_NAMES: { + struct kvm_stats_names stats_names; + + r = -EFAULT; + if (copy_from_user(&stats_names, argp, sizeof(stats_names))) + goto out; + r = -EINVAL; + if (stats_names.size < + (VM_STAT_COUNT + VCPU_STAT_COUNT) * KVM_STATS_NAME_LEN) + goto out; + r = -EFAULT; + argp += sizeof(stats_names); + if (copy_to_user(argp, kvm_vm_stat_strings, + VM_STAT_COUNT * KVM_STATS_NAME_LEN)) + goto out; + argp += VM_STAT_COUNT * KVM_STATS_NAME_LEN; + if (copy_to_user(argp, kvm_vcpu_stat_strings, + VCPU_STAT_COUNT * KVM_STATS_NAME_LEN)) + goto out; + r = 0; + break; + } + case KVM_STATS_GET_DATA: + r = kvm_vm_ioctl_stats_get_data(kvm, arg); + break; case KVM_CHECK_EXTENSION: r = kvm_vm_ioctl_check_extension_generic(kvm, arg); break;