From patchwork Thu Feb 25 02:14:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Axel Rasmussen X-Patchwork-Id: 12103101 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 06916C433E0 for ; Thu, 25 Feb 2021 02:16:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C735764EC8 for ; Thu, 25 Feb 2021 02:16:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236694AbhBYCQE (ORCPT ); Wed, 24 Feb 2021 21:16:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236345AbhBYCQC (ORCPT ); Wed, 24 Feb 2021 21:16:02 -0500 Received: from mail-qt1-x849.google.com (mail-qt1-x849.google.com [IPv6:2607:f8b0:4864:20::849]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E375C06178B for ; Wed, 24 Feb 2021 18:14:45 -0800 (PST) Received: by mail-qt1-x849.google.com with SMTP id k17so3088346qtm.13 for ; Wed, 24 Feb 2021 18:14:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=us3C43DDKNe3vmD9vgqgm0NwVPFkKr8bUz8YjvFEJ68=; b=azgcrjBFGpIKHs9mxItadu7KNGX0xu18yRBYBSTtzn10N/qHaP7iMaiGNC6TyUinsH rb2tllixM92p5m+B5NgoMFtXPvjZI8o1xwoTvKVPXKHy1M6zYf6sKExD/BXKQH3fzCh8 LFqhrL0Geo1ardkbKKRN/9vEiMKhfliNXskKF+jT5eO1CUAyNRSPW6KoCXpEpsZAeFe4 xN2WhiwXQgMxRfnQVFbiHs2iKlqa9tIwBVqTukBZ17FeYY3sk3LEBnfgvrZczbxshuya Lw2XGBbiJWWFlyMNJRsphvWzZEtLQ+3NSxdfBmMv47Kschp49h+MyyqiExfLJCpBmLj+ ugaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=us3C43DDKNe3vmD9vgqgm0NwVPFkKr8bUz8YjvFEJ68=; b=hlmOKbucjyKSEXtGP0E36hNcsc0Suy816IDjEL13uA5Gns0QQiKk4lR6Ab4fFh9dlv eDzfKTtYyoXpK/iyblaFbd919kSPEBP0baxLbwVpkTM2sCw7Ld11X39+5k4kp0ly3p3h PvQhtLwZjDbolKaehN9qddXS0L2Vp5BsZhOs7tAZ4pMgvFeRKGNgCj58B7FYuCbhwVWn xmyiIJukUfIpRJe7GOLGcKnzgDpv7ixrylp+Yx8i2B2If5A+egZv50v6FR2QmsURdsIx QSu6SSZB7vV/VcYmNNjaaJ+oECNhkdd1Ns8qMXZVN/90x1Q6naNobDFf9jgNYlqVVqgM oGoA== X-Gm-Message-State: AOAM533F5xQOcXNR/zp0maSxC+P8jU1rN7M0AtSzkoE4IE0HW9Ybw83S z9zh9aH59wY+yP9MV6EunwQfzFhIn6AWdOMfEnlR X-Google-Smtp-Source: ABdhPJydO3y5DVIx8aI+4cvq389VtWeuFRi8HvtBqAFhsL4dc3FHyt3DUtvBG34/zGlnmXM6v+kW4HrqI9UrE9mMR2CR Sender: "axelrasmussen via sendgmr" X-Received: from ajr0.svl.corp.google.com ([2620:15c:2cd:203:a5fd:f848:2fdf:4651]) (user=axelrasmussen job=sendgmr) by 2002:ad4:58c3:: with SMTP id dh3mr682909qvb.27.1614219284205; Wed, 24 Feb 2021 18:14:44 -0800 (PST) Date: Wed, 24 Feb 2021 18:14:17 -0800 In-Reply-To: <20210225021420.2290912-1-axelrasmussen@google.com> Message-Id: <20210225021420.2290912-3-axelrasmussen@google.com> Mime-Version: 1.0 References: <20210225021420.2290912-1-axelrasmussen@google.com> X-Mailer: git-send-email 2.30.0.617.g56c4b15f3c-goog Subject: [PATCH 2/5] userfaultfd/selftests: use memfd_create for shmem test type From: Axel Rasmussen To: Alexander Viro , Andrea Arcangeli , Andrew Morton , Hugh Dickins , Jerome Glisse , Joe Perches , Lokesh Gidra , Mike Rapoport , Peter Xu , Shaohua Li , Shuah Khan , Wang Qing Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Axel Rasmussen , Cannon Matthews , "Dr . David Alan Gilbert" , David Rientjes , Michel Lespinasse , Mina Almasry , Oliver Upton Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org This is a preparatory commit. In the future, we want to be able to setup alias mappings for area_src and area_dst in the shmem test, like we do in the hugetlb_shared test. With a VMA obtained via mmap(MAP_ANONYMOUS | MAP_SHARED), it isn't clear how to do this. So, mmap() with an fd, so we can create alias mappings. Use memfd_create instead of actually passing in a tmpfs path like hugetlb does, since it's more convenient / simpler to run, and works just as well. Future commits will: 1. Setup the alias mappings. 2. Extend our tests to actually take advantage of this, to test new userfaultfd behavior being introduced in this series. Also, a small fix in the area we're changing: when the hugetlb setup fails in main(), pass in the right argv[] so we actually print out the hugetlb file path. Signed-off-by: Axel Rasmussen --- tools/testing/selftests/vm/userfaultfd.c | 35 ++++++++++++++++++++---- 1 file changed, 30 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c index f5ab5e0312e7..859398efb4fe 100644 --- a/tools/testing/selftests/vm/userfaultfd.c +++ b/tools/testing/selftests/vm/userfaultfd.c @@ -85,6 +85,7 @@ static bool test_uffdio_wp = false; static bool test_uffdio_minor = false; static bool map_shared; +static int shm_fd; static int huge_fd; static char *huge_fd_off0; static unsigned long long *count_verify; @@ -297,12 +298,20 @@ static int shmem_release_pages(char *rel_area) static void shmem_allocate_area(void **alloc_area) { + unsigned long offset = + alloc_area == (void **)&area_src ? 0 : nr_pages * page_size; + *alloc_area = mmap(NULL, nr_pages * page_size, PROT_READ | PROT_WRITE, - MAP_ANONYMOUS | MAP_SHARED, -1, 0); + MAP_SHARED, shm_fd, offset); if (*alloc_area == MAP_FAILED) { - fprintf(stderr, "shared memory mmap failed\n"); - *alloc_area = NULL; + perror("mmap of memfd failed"); + goto fail; } + + return; + +fail: + *alloc_area = NULL; } struct uffd_test_ops { @@ -1672,15 +1681,31 @@ int main(int argc, char **argv) usage(); huge_fd = open(argv[4], O_CREAT | O_RDWR, 0755); if (huge_fd < 0) { - fprintf(stderr, "Open of %s failed", argv[3]); + fprintf(stderr, "Open of %s failed", argv[4]); perror("open"); exit(1); } if (ftruncate(huge_fd, 0)) { - fprintf(stderr, "ftruncate %s to size 0 failed", argv[3]); + fprintf(stderr, "ftruncate %s to size 0 failed", argv[4]); perror("ftruncate"); exit(1); } + } else if (test_type == TEST_SHMEM) { + shm_fd = memfd_create(argv[0], 0); + if (shm_fd < 0) { + perror("memfd_create"); + exit(1); + } + if (ftruncate(shm_fd, nr_pages * page_size * 2)) { + perror("ftruncate"); + exit(1); + } + if (fallocate(shm_fd, + FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, + nr_pages * page_size * 2)) { + perror("fallocate"); + exit(1); + } } printf("nr_pages: %lu, nr_pages_per_cpu: %lu\n", nr_pages, nr_pages_per_cpu);