From patchwork Mon May 3 18:07:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Axel Rasmussen X-Patchwork-Id: 12236721 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 EC33FC433ED for ; Mon, 3 May 2021 18:08:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C9F0F61363 for ; Mon, 3 May 2021 18:08:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231947AbhECSJS (ORCPT ); Mon, 3 May 2021 14:09:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42690 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232036AbhECSJC (ORCPT ); Mon, 3 May 2021 14:09:02 -0400 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 6F33EC06135A for ; Mon, 3 May 2021 11:08:02 -0700 (PDT) Received: by mail-qt1-x849.google.com with SMTP id w10-20020ac86b0a0000b02901ba74ac38c9so1950718qts.22 for ; Mon, 03 May 2021 11:08:02 -0700 (PDT) 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=ntouV34m2zzK96oVKUjz7Unp11YYIFITerKCQ/PICUo=; b=AabA9pNdVHR8wrAzCpx2+upbcMZBKVFarGpOoH4Xk/pMoNwzxHSVAVZbMSVw5xg+fw 7/C+w4V3s83Qq2uRdOkxN3vqlsdzIJTWPCiLHlFYuFvXL216RqNGqAqQT0xJOz6rlGuu 7jTjsObZhjLM6eIlBM9C+dl5P5tu+bZ7yF8CPjYkJgsyLmyOmSZt/dZwNN0GTnF+0lic isndnsawZBzxPFoBuMwYiCgrcK6McGt9MZZMQXBNufkSumKB5sbDo4c4tOQ7kxe0SLSh HO79/mVXzjgFKOxf0OVFfenBh5T/OvVrNJZfk777uxUhclay/uqQCEHduvlyoPcts/yn /ktA== 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=ntouV34m2zzK96oVKUjz7Unp11YYIFITerKCQ/PICUo=; b=NXHPu8ngy4sxdsmJ7zIaPgqHWeqGdkKEh5wk3fni9IAfo8etEH/5wgRLen2M70dl3L vgpBeVZ6HD39kATSebhDynre3z2rGDFotGfWZBomrxWZS6fV/jmgEECQ0xp3mDzmJdY/ wzQJvWzk9vnB+ZBN9Lq3QB3i6afs2o7KPimod9u+nzE2xX/XM6hSz3R9Dm9xBGE8hG37 13hn8ywR0adqsNfoeCLEdTODUYsRYraYp2OPfVtw8Ah25juI3MtghfdrsB230DtX4qR6 4Bw0zxNIe4N7oH6lgkXwjfZ+8r2KX4dIor4Id2jHboB8yP+VBrYManBrn7TGZzp8TySq Tj7A== X-Gm-Message-State: AOAM533rQVUm3FI/YDhMxjQ5PWIe/ElkIeopt21yNRSNbfO+OWd5p2bu mv3YjyYCM5DZw2WKRMh8KciygXwNpoYPVmUQArli X-Google-Smtp-Source: ABdhPJwrhkcA07r1npaWCK9fxUqJ2Xw1p2+5ZZDXTYqOYqIOwOPfPfCd9E+z83gXUpu5S4gSaGrtBt+b+HU5WgQxVGvi X-Received: from ajr0.svl.corp.google.com ([2620:15c:2cd:203:3d79:e69a:a4f9:ef0]) (user=axelrasmussen job=sendgmr) by 2002:ad4:4f82:: with SMTP id em2mr20912806qvb.55.1620065281620; Mon, 03 May 2021 11:08:01 -0700 (PDT) Date: Mon, 3 May 2021 11:07:37 -0700 In-Reply-To: <20210503180737.2487560-1-axelrasmussen@google.com> Message-Id: <20210503180737.2487560-11-axelrasmussen@google.com> Mime-Version: 1.0 References: <20210503180737.2487560-1-axelrasmussen@google.com> X-Mailer: git-send-email 2.31.1.527.g47e6f16901-goog Subject: [PATCH v6 10/10] userfaultfd/selftests: exercise minor fault handling shmem support From: Axel Rasmussen To: Alexander Viro , Andrea Arcangeli , Andrew Morton , Hugh Dickins , Jerome Glisse , Joe Perches , Lokesh Gidra , Mike Kravetz , Mike Rapoport , Peter Xu , Shaohua Li , Shuah Khan , Stephen Rothwell , Wang Qing Cc: linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, Axel Rasmussen , Brian Geffon , "Dr . David Alan Gilbert" , Mina Almasry , Oliver Upton Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Enable test_uffdio_minor for test_type == TEST_SHMEM, and modify the test slightly to pass in / check for the right feature flags. Reviewed-by: Peter Xu Signed-off-by: Axel Rasmussen --- tools/testing/selftests/vm/userfaultfd.c | 29 ++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c index 3fbc69f513dc..a7ecc9993439 100644 --- a/tools/testing/selftests/vm/userfaultfd.c +++ b/tools/testing/selftests/vm/userfaultfd.c @@ -474,6 +474,7 @@ static void wp_range(int ufd, __u64 start, __u64 len, bool wp) static void continue_range(int ufd, __u64 start, __u64 len) { struct uffdio_continue req; + int ret; req.range.start = start; req.range.len = len; @@ -482,6 +483,17 @@ static void continue_range(int ufd, __u64 start, __u64 len) if (ioctl(ufd, UFFDIO_CONTINUE, &req)) err("UFFDIO_CONTINUE failed for address 0x%" PRIx64, (uint64_t)start); + + /* + * Error handling within the kernel for continue is subtly different + * from copy or zeropage, so it may be a source of bugs. Trigger an + * error (-EEXIST) on purpose, to verify doing so doesn't cause a BUG. + */ + req.mapped = 0; + ret = ioctl(ufd, UFFDIO_CONTINUE, &req); + if (ret >= 0 || req.mapped != -EEXIST) + err("failed to exercise UFFDIO_CONTINUE error handling, ret=%d, mapped=%" PRId64, + ret, (int64_t) req.mapped); } static void *locking_thread(void *arg) @@ -1182,7 +1194,7 @@ static int userfaultfd_minor_test(void) void *expected_page; char c; struct uffd_stats stats = { 0 }; - uint64_t features = UFFD_FEATURE_MINOR_HUGETLBFS; + uint64_t req_features, features_out; if (!test_uffdio_minor) return 0; @@ -1190,9 +1202,17 @@ static int userfaultfd_minor_test(void) printf("testing minor faults: "); fflush(stdout); - uffd_test_ctx_init_ext(&features); - /* If kernel reports the feature isn't supported, skip the test. */ - if (!(features & UFFD_FEATURE_MINOR_HUGETLBFS)) { + if (test_type == TEST_HUGETLB) + req_features = UFFD_FEATURE_MINOR_HUGETLBFS; + else if (test_type == TEST_SHMEM) + req_features = UFFD_FEATURE_MINOR_SHMEM; + else + return 1; + + features_out = req_features; + uffd_test_ctx_init_ext(&features_out); + /* If kernel reports required features aren't supported, skip test. */ + if ((features_out & req_features) != req_features) { printf("skipping test due to lack of feature support\n"); fflush(stdout); return 0; @@ -1426,6 +1446,7 @@ static void set_test_type(const char *type) map_shared = true; test_type = TEST_SHMEM; uffd_test_ops = &shmem_uffd_test_ops; + test_uffdio_minor = true; } else { err("Unknown test type: %s", type); }