From patchwork Tue Apr 27 22:52:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Axel Rasmussen X-Patchwork-Id: 12227699 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 21FAAC433ED for ; Tue, 27 Apr 2021 22:53:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0473E613D9 for ; Tue, 27 Apr 2021 22:53:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239481AbhD0Wxz (ORCPT ); Tue, 27 Apr 2021 18:53:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53804 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239460AbhD0Wxv (ORCPT ); Tue, 27 Apr 2021 18:53:51 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92B2CC06138B for ; Tue, 27 Apr 2021 15:53:07 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id e8-20020a2587480000b02904e5857564e2so39485089ybn.16 for ; Tue, 27 Apr 2021 15:53:07 -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=RRWLcA4U8+e/XOHvkZswRCx0YI32rbruxBRpXWbXmCs=; b=okG18pV2cHje7Vas2xHrgpMSRzPJeLI9iRNJPNE0FPrPp6Klcqy7/1Swk9FhXFy3Qb tJpEyh/CfyzSMCfu+ZiCoWyeiRSKT3APXIJisybUxKCfMpzvt07y/CRA5np6G5JapEpB IUI6hMM0aN7/n1yjIYUXs9pj5LHPpMC/9gDy2s4fGjKSH94J6JXZvHYcGTjVJ0ktYWkq 1gR8Oy0hwQTr9EXyrrp0TO9YsOE8GFBDMrUmb73xr9K7a7VeRuC2Vo+NbSMC+Jz2Elej wemHAx8m2OCf16Mzand+AzUNOPgoC4hkLUjk9Kez5uNslnMgycE0zkqOGfIF4GhASWCT 0Yvw== 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=RRWLcA4U8+e/XOHvkZswRCx0YI32rbruxBRpXWbXmCs=; b=qDWbTXbjlDplNs55KFZtwpGK9SYdHRfIkpD6sJeyRRW9tlQ9c/sb3rRfvmkRTIrv65 1p524QmQZgS9kSELM+DDRYOfuA25YyscsICICFdW8kZJ5yme37bCQ6U5iHB2hPkU2n+u aJUIn5CNaIOD+1r3HMUy0UuuCJDv2pbbWlZHxizHDBDFaN7XjXXpdxllsN/x7ODpTue3 2Bj0r/jASobo64nWO7ErLdfP25oB4M3zxinei+G07Vdi+N+lKwmRkRsdA7Oixb+HxuSK j2bVe4Do4gkHxEOBoRhOy8XfMajTlv8514dQ9VhqQpUBJ+oNEVWx919vpHNyFLewWuO7 ovFw== X-Gm-Message-State: AOAM532ZAXA0UkmbKfRJimNxeochG+aXb2YNhxTIrEjstMR02cYcm0Vj nE4lVCNDHz8kjFoND7svHqRcT/Ckud5L8KMVFKnx X-Google-Smtp-Source: ABdhPJzDsCZYem6SJI6F68LBLgPVRrD7LYUqb4Kv0yx1mHkS1m/coZ3723JWgl0BgYOQPFBBRglbFBkLq324+VmTx7i4 X-Received: from ajr0.svl.corp.google.com ([2620:15c:2cd:203:c423:570b:b823:c33e]) (user=axelrasmussen job=sendgmr) by 2002:a25:8682:: with SMTP id z2mr12874549ybk.325.1619563986815; Tue, 27 Apr 2021 15:53:06 -0700 (PDT) Date: Tue, 27 Apr 2021 15:52:44 -0700 In-Reply-To: <20210427225244.4326-1-axelrasmussen@google.com> Message-Id: <20210427225244.4326-11-axelrasmussen@google.com> Mime-Version: 1.0 References: <20210427225244.4326-1-axelrasmussen@google.com> X-Mailer: git-send-email 2.31.1.498.g6c1eba8ee3d-goog Subject: [PATCH v5 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-fsdevel@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. Signed-off-by: Axel Rasmussen Reviewed-by: Peter Xu --- 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); }