From mboxrd@z Thu Jan 1 00:00:00 1970 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=ham 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 9F3A0C4320A for ; Sun, 29 Aug 2021 18:26:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8B26F60F51 for ; Sun, 29 Aug 2021 18:26:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235927AbhH2S1m (ORCPT ); Sun, 29 Aug 2021 14:27:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60100 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235917AbhH2S1k (ORCPT ); Sun, 29 Aug 2021 14:27:40 -0400 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CACBFC0613D9 for ; Sun, 29 Aug 2021 11:26:47 -0700 (PDT) Received: by mail-pf1-x44a.google.com with SMTP id b65-20020a621b44000000b003edc0db6a05so821475pfb.19 for ; Sun, 29 Aug 2021 11:26:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=aZ7Pxe57fEMPbk2rJbVH9QT9ZPZ0Llj+AGW3Zhhzqrg=; b=pMm/Mr/m+aeIjuPR3E6Tu57eT5lCddN9PZV3IMO6Pjou3ecMrqfq8+Qj6Fen1HDurR Y2p+Z35+8u+klOa2DFSVyoCFHOv883/AKQR3Ef2+h+noBzSv1ohLwwphTLFL1kYaFkzk Dy7JGgsxGDPDUvPXwJYz62ArCioB0ABY/Hin+iwPvE8iEBtrODAyduBi5vRzsh4j4SYA ulBk++yfF46kwYWRdN8vyOWOw5JUGrg+IqVxgzINTcDykJoZdpyKoOCgow3gkx2hbVvz ncSh/d89hB32jVFQUo1tBXUEsSCWOUI8GePUmgbvp5vBBDqKke0Pnlb/NG9bOVhicn5r sLmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=aZ7Pxe57fEMPbk2rJbVH9QT9ZPZ0Llj+AGW3Zhhzqrg=; b=gPS/8YAzQ/pHN62Q2LJlc2M6fx29o/VDr21jNzHm99GubN6ifMBCTKantAEnKtpEzB BMpBs5lOgt/jqmaGJUXdyXpe/9QBwqIyJ10dEWnecwhTq0wxnn4+huNIArzqQgoX8sOS KFRczHWJuvpm4XY62OFZ1hUnJCgQFUuVqqRkgLO7JLR7zk1e1WCWd2kCQKJhtJ1T78WY 9JHm5NT5yK4FcVLUvCmvfw/My7NwWjR2n24Cb28F/C8EGVn/JcW+fPAMF7Qv6Tb9IFzp EW6SLMK1pTa0cJFuhj1z9/byBIoM0leWl/puuFq33L9oOVqJhIsldJA6ibdy5IfBQ3mp oQ3Q== X-Gm-Message-State: AOAM530QcLxkJ4mGxr1F6qS/HFJOwiJt3fBtggiZhj7RbjEnPk8nNz2H 4pm01ku8peqJhxfZLZrVel6Gl4my7YLE X-Google-Smtp-Source: ABdhPJzNdyDE37ZnSg/vofjbh4REKSTi7y/r+ggckFH2AlyLQ7A6Tw01hVhzg48Yv/9ZsyehNgKDIRPJeup2 X-Received: from mizhang-super.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1071]) (user=mizhang job=sendgmr) by 2002:a17:903:2c2:b029:101:9c88:d928 with SMTP id s2-20020a17090302c2b02901019c88d928mr18444239plk.62.1630261607275; Sun, 29 Aug 2021 11:26:47 -0700 (PDT) Reply-To: Mingwei Zhang Date: Sun, 29 Aug 2021 18:26:41 +0000 In-Reply-To: <20210829182641.2505220-1-mizhang@google.com> Message-Id: <20210829182641.2505220-3-mizhang@google.com> Mime-Version: 1.0 References: <20210829182641.2505220-1-mizhang@google.com> X-Mailer: git-send-email 2.33.0.259.gc128427fd7-goog Subject: [PATCH v2 2/2] selftests: KVM: use dirty logging to check if page stats work correctly From: Mingwei Zhang To: Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Sean Christopherson , David Matlack , Jing Zhang , Peter Xu , Ben Gardon , Mingwei Zhang Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When dirty logging is enabled, KVM splits the hugepage mapping in NPT/EPT into the smallest 4K size after guest VM writes to it. This property could be used to check if the page stats metrics work properly in KVM x86/mmu. At the same time, this logic might be used the other way around: using page stats to verify if dirty logging really splits all huge pages after guest VM writes to all memory. So add page stats checking in dirty logging performance selftest. In particular, add checks in three locations: - just after vm is created; - after populating memory into vm without turning on dirty logging; - after guest vm writing to all memory again with dirty logging turned on. Tested using commands: - ./dirty_log_perf_test -s anonymous_hugetlb_1gb - ./dirty_log_perf_test -s anonymous_hugetlb_2mb - ./dirty_log_perf_test -s anonymous_thp Cc: Sean Christopherson Cc: David Matlack Cc: Jing Zhang Cc: Peter Xu Suggested-by: Ben Gardon Signed-off-by: Mingwei Zhang --- .../selftests/kvm/dirty_log_perf_test.c | 44 +++++++++++++++++++ .../testing/selftests/kvm/include/test_util.h | 1 + .../selftests/kvm/include/x86_64/processor.h | 7 +++ tools/testing/selftests/kvm/lib/test_util.c | 29 ++++++++++++ 4 files changed, 81 insertions(+) diff --git a/tools/testing/selftests/kvm/dirty_log_perf_test.c b/tools/testing/selftests/kvm/dirty_log_perf_test.c index 3c30d0045d8d..1fc63ad55cf3 100644 --- a/tools/testing/selftests/kvm/dirty_log_perf_test.c +++ b/tools/testing/selftests/kvm/dirty_log_perf_test.c @@ -19,6 +19,10 @@ #include "perf_test_util.h" #include "guest_modes.h" +#ifdef __x86_64__ +#include "processor.h" +#endif + /* How many host loops to run by default (one KVM_GET_DIRTY_LOG for each loop)*/ #define TEST_HOST_LOOP_N 2UL @@ -166,6 +170,18 @@ static void run_test(enum vm_guest_mode mode, void *arg) vm = perf_test_create_vm(mode, nr_vcpus, guest_percpu_mem_size, p->slots, p->backing_src); +#ifdef __x86_64__ + /* + * No vCPUs have been started yet, so KVM should not have created any + * mapping at this moment. + */ + TEST_ASSERT(get_page_stats(X86_PAGE_SIZE_4K) == 0, + "4K page is non zero"); + TEST_ASSERT(get_page_stats(X86_PAGE_SIZE_2M) == 0, + "2M page is non zero"); + TEST_ASSERT(get_page_stats(X86_PAGE_SIZE_1G) == 0, + "1G page is non zero"); +#endif perf_test_args.wr_fract = p->wr_fract; guest_num_pages = (nr_vcpus * guest_percpu_mem_size) >> vm_get_page_shift(vm); @@ -211,6 +227,22 @@ static void run_test(enum vm_guest_mode mode, void *arg) pr_info("Populate memory time: %ld.%.9lds\n", ts_diff.tv_sec, ts_diff.tv_nsec); +#ifdef __x86_64__ + TEST_ASSERT(get_page_stats(X86_PAGE_SIZE_4K) != 0, + "4K page is zero"); + /* Ensure THP page stats is non-zero to minimize the flakiness. */ + if (p->backing_src == VM_MEM_SRC_ANONYMOUS_THP) + TEST_ASSERT(get_page_stats(X86_PAGE_SIZE_2M) > 0 + "2M page number is zero"); + else if (p->backing_src == VM_MEM_SRC_ANONYMOUS_HUGETLB_2MB) + TEST_ASSERT(get_page_stats(X86_PAGE_SIZE_2M) == + (guest_percpu_mem_size * nr_vcpus) >> X86_PAGE_2M_SHIFT, + "2M page number does not match"); + else if (p->backing_src == VM_MEM_SRC_ANONYMOUS_HUGETLB_1GB) + TEST_ASSERT(get_page_stats(X86_PAGE_SIZE_1G) == + (guest_percpu_mem_size * nr_vcpus) >> X86_PAGE_1G_SHIFT, + "1G page number does not match"); +#endif /* Enable dirty logging */ clock_gettime(CLOCK_MONOTONIC, &start); enable_dirty_logging(vm, p->slots); @@ -256,6 +288,18 @@ static void run_test(enum vm_guest_mode mode, void *arg) iteration, ts_diff.tv_sec, ts_diff.tv_nsec); } } +#ifdef __x86_64__ + /* + * When vCPUs writes to all memory again with dirty logging enabled, we + * should see only 4K page mappings exist in KVM mmu. + */ + TEST_ASSERT(get_page_stats(X86_PAGE_SIZE_4K) != 0, + "4K page is zero after dirtying memory"); + TEST_ASSERT(get_page_stats(X86_PAGE_SIZE_2M) == 0, + "2M page is non-zero after dirtying memory"); + TEST_ASSERT(get_page_stats(X86_PAGE_SIZE_1G) == 0, + "1G page is non-zero after dirtying memory"); +#endif /* Disable dirty logging */ clock_gettime(CLOCK_MONOTONIC, &start); diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h index d79be15dd3d2..dca5fcf7aa87 100644 --- a/tools/testing/selftests/kvm/include/test_util.h +++ b/tools/testing/selftests/kvm/include/test_util.h @@ -102,6 +102,7 @@ const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i); size_t get_backing_src_pagesz(uint32_t i); void backing_src_help(void); enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name); +size_t get_page_stats(uint32_t page_level); /* * Whether or not the given source type is shared memory (as opposed to diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h index 242ae8e09a65..9749319821a3 100644 --- a/tools/testing/selftests/kvm/include/x86_64/processor.h +++ b/tools/testing/selftests/kvm/include/x86_64/processor.h @@ -39,6 +39,13 @@ #define X86_CR4_SMAP (1ul << 21) #define X86_CR4_PKE (1ul << 22) +#define X86_PAGE_4K_SHIFT 12 +#define X86_PAGE_4K (1ul << X86_PAGE_4K_SHIFT) +#define X86_PAGE_2M_SHIFT 21 +#define X86_PAGE_2M (1ul << X86_PAGE_2M_SHIFT) +#define X86_PAGE_1G_SHIFT 30 +#define X86_PAGE_1G (1ul << X86_PAGE_1G_SHIFT) + /* CPUID.1.ECX */ #define CPUID_VMX (1ul << 5) #define CPUID_SMX (1ul << 6) diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c index af1031fed97f..07eb6b5c125e 100644 --- a/tools/testing/selftests/kvm/lib/test_util.c +++ b/tools/testing/selftests/kvm/lib/test_util.c @@ -15,6 +15,13 @@ #include "linux/kernel.h" #include "test_util.h" +#include "processor.h" + +static const char * const pagestat_filepaths[] = { + "/sys/kernel/debug/kvm/pages_4k", + "/sys/kernel/debug/kvm/pages_2m", + "/sys/kernel/debug/kvm/pages_1g", +}; /* * Parses "[0-9]+[kmgt]?". @@ -141,6 +148,28 @@ size_t get_trans_hugepagesz(void) return size; } +#ifdef __x86_64__ +size_t get_stats_from_file(const char *path) +{ + size_t value; + FILE *f; + + f = fopen(path, "r"); + TEST_ASSERT(f != NULL, "Error in opening file: %s\n", path); + + fscanf(f, "%ld", &value); + fclose(f); + + return value; +} + +size_t get_page_stats(uint32_t page_level) +{ + TEST_ASSERT(page_level <= X86_PAGE_SIZE_1G, "page type error."); + return get_stats_from_file(pagestat_filepaths[page_level]); +} +#endif + size_t get_def_hugetlb_pagesz(void) { char buf[64]; -- 2.33.0.259.gc128427fd7-goog