From patchwork Sat Jan 11 00:50:48 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 13935711 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3EEFBE77188 for ; Sat, 11 Jan 2025 02:08:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:Cc:To: From:Subject:Message-ID:References:Mime-Version:In-Reply-To:Date: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=jTPjKFoWnkMFK18trrM7yX38QagKVQtox0CY8pTl0Bc=; b=5Ej7zmjgb0+GpMv3t67+874dkF G15PE00vQIPgJjXmME4uzpebrR+yW3d29Rs59ci/BND6QL804a7h0b58sUbrZ2QwY09t/8GbBygyn SfA/BRlKQftP10OgrsTSt82hxpGIYfyV6KAi/YgnGz91uDXUnexY2lzwThQq8crQyTJCUA+MdNMIb MzwXh01mQJ4iaw8/PJjvUQJyDjou7iCnt+msNALQPD//1LNlf7aSoM3aZeCO2zfU+lKan877zr9Se B2MZon6lnUtYiYgaWC0v8WWiUfKwtBdQitt67YhFE2T9uDe/1nKiMvLSEl0ZtSPu7HxuTx28dg+ZE g13DmemQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tWQud-0000000HYGm-1J91; Sat, 11 Jan 2025 02:07:43 +0000 Received: from mail-pj1-x104a.google.com ([2607:f8b0:4864:20::104a]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tWPiU-0000000HQOt-1FQN for linux-arm-kernel@lists.infradead.org; Sat, 11 Jan 2025 00:51:07 +0000 Received: by mail-pj1-x104a.google.com with SMTP id 98e67ed59e1d1-2efc3292021so6654147a91.1 for ; Fri, 10 Jan 2025 16:51:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1736556665; x=1737161465; darn=lists.infradead.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=jTPjKFoWnkMFK18trrM7yX38QagKVQtox0CY8pTl0Bc=; b=EPxm7W0iCU/5ySiLlRBpXN85sALMgLSuSfE5lJSFlnYlFJZ42CAsKdFxwPVP2tsk5o ACM3bKFCjHe1S6nSXRlY3AB5ePjvsdVORV20LCAB+Xx2KIutovGVttk0DiYIS3/Q+yPN l3L9FmiXz2q6Mds5UZGQ2iGTMqchgc3Ri2KrFqaDoZKW8LBnGE/m4B6qTbx3eyh+Ttw5 OUEMeMy43cpKZhqmcqyuJdsYyUX+0dpYNqdMKLhkQl+rWb+g9o79sg0JyIg1n7sxPPyw frxb0KN3tzZdiVERPEzwaTxZiUF9/KzEHgO+U/oVBG90fkgYQsdeec6JMp/+2IOqV9WA dIlQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1736556665; x=1737161465; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=jTPjKFoWnkMFK18trrM7yX38QagKVQtox0CY8pTl0Bc=; b=AWkl1Mh/zk04Xq1RwCqkoBwd+L9uaFFLmf5Bhmf9iLLSSwKhJ/aVLKUImaOLcTE+yk v4nQxt3UjAaHIuLkzwDAofjDCuQRCaEz9LfALBU3t1bVyjB0my660Ej4bABWVqvHWRBj PEb0LxEZPa0U13BZ11kHzITzrl2rviSJcyXkY5p1pEA4tRrcApQkqMtIqdcG+0mGpNFB MOcxsMXc3gIc7HqTJHjlhHVEwA2ZQaXFbpO9LFd5tGDgRj4ZYkZbxe5ZoB1C+anOaaYU ET2rvOM05rzId5EY5wnM5ukKWjk5VbVr4wLGFRSxpAWVBeqXlIIJbQL2/SYEY3hVuI2i GmIA== X-Gm-Message-State: AOJu0Yxx+3sNEYSKoeoBvH+IiTtrBYQqwrOSWqHToo41nB5XB1ti5fZs +3dXADn+H43ZqJW1g4KbNKHybHP3MXSpwHiwXmTwTuhIlaGoobUL4BZ4vfoh19xDDgMU0Y4Ts69 0aw== X-Google-Smtp-Source: AGHT+IFOLE/1SSJYHsGdzvK8LKxhrHPTw3kVbRGTeeJk8BpZZB2Ck9vGEUtjLxLwAqw4e0hK1JN9nSs0EVE= X-Received: from pjbsg5.prod.google.com ([2002:a17:90b:5205:b0:2ee:3cc1:793d]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:2c84:b0:2ea:a25d:3baa with SMTP id 98e67ed59e1d1-2f548f17351mr17744741a91.5.1736556665395; Fri, 10 Jan 2025 16:51:05 -0800 (PST) Date: Fri, 10 Jan 2025 16:50:48 -0800 In-Reply-To: <20250111005049.1247555-1-seanjc@google.com> Mime-Version: 1.0 References: <20250111005049.1247555-1-seanjc@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20250111005049.1247555-9-seanjc@google.com> Subject: [PATCH v2 8/9] KVM: selftests: Add infrastructure for getting vCPU binary stats From: Sean Christopherson To: Marc Zyngier , Oliver Upton , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson , Paolo Bonzini Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250110_165106_337149_5B97DCEA X-CRM114-Status: GOOD ( 20.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Now that the binary stats cache infrastructure is largely scope agnostic, add support for vCPU-scoped stats. Like VM stats, open and cache the stats FD when the vCPU is created so that it's guaranteed to be valid when vcpu_get_stats() is invoked. Account for the extra per-vCPU file descriptor in kvm_set_files_rlimit(), so that tests that create large VMs don't run afoul of resource limits. To sanity check that the infrastructure actually works, and to get a bit of bonus coverage, add an assert in x86's xapic_ipi_test to verify that the number of HLTs executed by the test matches the number of HLT exits observed by KVM. Signed-off-by: Sean Christopherson --- .../testing/selftests/kvm/include/kvm_util.h | 20 +++++++----- tools/testing/selftests/kvm/lib/kvm_util.c | 32 ++++++++----------- .../selftests/kvm/x86/xapic_ipi_test.c | 2 ++ 3 files changed, 27 insertions(+), 27 deletions(-) diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index d4670b5962ab..373912464fb4 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -61,6 +61,7 @@ struct kvm_vcpu { #ifdef __x86_64__ struct kvm_cpuid2 *cpuid; #endif + struct kvm_binary_stats stats; struct kvm_dirty_gfn *dirty_gfns; uint32_t fetch_index; uint32_t dirty_gfns_count; @@ -534,17 +535,20 @@ void read_stat_data(int stats_fd, struct kvm_stats_header *header, struct kvm_stats_desc *desc, uint64_t *data, size_t max_elements); -void __vm_get_stat(struct kvm_vm *vm, const char *stat_name, uint64_t *data, - size_t max_elements); +void kvm_get_stat(struct kvm_binary_stats *stats, const char *name, + uint64_t *data, size_t max_elements); -#define vm_get_stat(vm, stat) \ -({ \ - uint64_t data; \ - \ - __vm_get_stat(vm, #stat, &data, 1); \ - data; \ +#define __get_stat(stats, stat) \ +({ \ + uint64_t data; \ + \ + kvm_get_stat(stats, #stat, &data, 1); \ + data; \ }) +#define vm_get_stat(vm, stat) __get_stat(&(vm)->stats, stat) +#define vcpu_get_stat(vcpu, stat) __get_stat(&(vcpu)->stats, stat) + void vm_create_irqchip(struct kvm_vm *vm); static inline int __vm_create_guest_memfd(struct kvm_vm *vm, uint64_t size, diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index f49bb504fa72..b1c3c7260902 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -415,10 +415,11 @@ static uint64_t vm_nr_pages_required(enum vm_guest_mode mode, void kvm_set_files_rlimit(uint32_t nr_vcpus) { /* - * Number of file descriptors required, nr_vpucs vCPU fds + an arbitrary - * number for everything else. + * Each vCPU will open two file descriptors: the vCPU itself and the + * vCPU's binary stats file descriptor. Add an arbitrary amount of + * buffer for all other files a test may open. */ - int nr_fds_wanted = nr_vcpus + 100; + int nr_fds_wanted = nr_vcpus * 2 + 100; struct rlimit rl; /* @@ -746,6 +747,8 @@ static void vm_vcpu_rm(struct kvm_vm *vm, struct kvm_vcpu *vcpu) ret = close(vcpu->fd); TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("close()", ret)); + kvm_stats_release(&vcpu->stats); + list_del(&vcpu->list); vcpu_arch_free(vcpu); @@ -1339,6 +1342,11 @@ struct kvm_vcpu *__vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id) TEST_ASSERT(vcpu->run != MAP_FAILED, __KVM_SYSCALL_ERROR("mmap()", (int)(unsigned long)MAP_FAILED)); + if (kvm_has_cap(KVM_CAP_BINARY_STATS_FD)) + vcpu->stats.fd = vcpu_get_stats_fd(vcpu); + else + vcpu->stats.fd = -1; + /* Add to linked-list of VCPUs. */ list_add(&vcpu->list, &vm->vcpus); @@ -2251,23 +2259,9 @@ void read_stat_data(int stats_fd, struct kvm_stats_header *header, desc->name, size, ret); } -/* - * Read the data of the named stat - * - * Input Args: - * vm - the VM for which the stat should be read - * stat_name - the name of the stat to read - * max_elements - the maximum number of 8-byte values to read into data - * - * Output Args: - * data - the buffer into which stat data should be read - * - * Read the data values of a specified stat from the binary stats interface. - */ -void __vm_get_stat(struct kvm_vm *vm, const char *name, uint64_t *data, - size_t max_elements) +void kvm_get_stat(struct kvm_binary_stats *stats, const char *name, + uint64_t *data, size_t max_elements) { - struct kvm_binary_stats *stats = &vm->stats; struct kvm_stats_desc *desc; size_t size_desc; int i; diff --git a/tools/testing/selftests/kvm/x86/xapic_ipi_test.c b/tools/testing/selftests/kvm/x86/xapic_ipi_test.c index a76078a08ff8..574a944763b7 100644 --- a/tools/testing/selftests/kvm/x86/xapic_ipi_test.c +++ b/tools/testing/selftests/kvm/x86/xapic_ipi_test.c @@ -465,6 +465,8 @@ int main(int argc, char *argv[]) cancel_join_vcpu_thread(threads[0], params[0].vcpu); cancel_join_vcpu_thread(threads[1], params[1].vcpu); + TEST_ASSERT_EQ(data->hlt_count, vcpu_get_stat(params[0].vcpu, halt_exits)); + fprintf(stderr, "Test successful after running for %d seconds.\n" "Sending vCPU sent %lu IPIs to halting vCPU\n"