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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 580FBC433EF for ; Wed, 1 Jun 2022 21:10:03 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E5D9E6B0074; Wed, 1 Jun 2022 17:10:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E126A6B0075; Wed, 1 Jun 2022 17:10:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CAD696B0078; Wed, 1 Jun 2022 17:10:02 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id BD0A76B0074 for ; Wed, 1 Jun 2022 17:10:02 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 7DAC734A09 for ; Wed, 1 Jun 2022 21:10:02 +0000 (UTC) X-FDA: 79530909444.14.3436437 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) by imf27.hostedemail.com (Postfix) with ESMTP id 2D14440055 for ; Wed, 1 Jun 2022 21:09:58 +0000 (UTC) Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-2fb7bf98f1aso25851657b3.5 for ; Wed, 01 Jun 2022 14:10:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=GEuH7v2hm8gPbs+X2v5W8KutfNkKgsCF+/5mNPJwBK0=; b=NeP/OeNWbhVp3hYIumiRRFBaPXdgXyAjdD7Zj0iRpLOZr9GndhZskF8GFrI0+0V7jy UN8+h16HnW6rKS6i3HCFhE+iWsyJjtYRQW2in2IqUsCcb3Qwky5IW2whpRmS441F3S2C FxHMvZZe/UEWlqji0Ii/+wf3NDCs73ENyGUtGHUqrxfp0B7MbA8Omg4W5On4qYlsLGPy sp9/TGzUmEa5ZQIxOm6KVUET5G5/zTqvPFKuPvalDfVXTeP66q18+53RNjMKYeRRNw2I 3z58aWIWYSn4SGF4HorICFDufV7uC0oZ6W8Ws9D9zWp/n+KcdLIyLZuJb78wLY1gcDuL FsHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=GEuH7v2hm8gPbs+X2v5W8KutfNkKgsCF+/5mNPJwBK0=; b=J7jDg2DLBOk/Tsu2zhW9I34Mkzj2ilMnqZyojTD0trv/ZSdZdB0AgKxpYglq0PnoPW rhCZrqAtu4+dUNTEl0qbMLuxn521tMmgAteRlkBwd1/6nZMM+WLO3cdrE1VsnpYKGBHV Nq/2PnOQ3UYuhwGvh6jxJNu7WlNCUxLOot8c2f/LGIpRSkXC/zyZcL70J7/X33trKqTc E2UTgcTKElgZLjl2XGpitLRXpCgkBDfk8OsqvyHxONzvbeA67aY3amX/D6L+4zTWZNaM B7nf7OQt27Db/nKVGAjb9mrnskED/6z/ib2m0UDX1j0I69jA+q6oAKLgVwoyrGc/ik3e UjqQ== X-Gm-Message-State: AOAM532JkrvGF7u9Gfnpj8x0lCSFzufuQHsWJ3gcyQ2ix+wj0N3SlGOW SzXE8R3i/uF7INLmLk/DG5Zg/GvkWRAWmfc1U+0I X-Google-Smtp-Source: ABdhPJxLYxJTU4wKWdQdJErOlnXgmFSzr5QQlaHudjQxgiYWQ/To+IWy0QKQkX1/fZdej8cYja73KHAsf5mUjbmiy+G7 X-Received: from ajr0.svl.corp.google.com ([2620:15c:2cd:203:aaec:e358:9f0e:2b26]) (user=axelrasmussen job=sendgmr) by 2002:a25:9ac1:0:b0:65c:bf5a:ce24 with SMTP id t1-20020a259ac1000000b0065cbf5ace24mr1913952ybo.378.1654117801445; Wed, 01 Jun 2022 14:10:01 -0700 (PDT) Date: Wed, 1 Jun 2022 14:09:48 -0700 In-Reply-To: <20220601210951.3916598-1-axelrasmussen@google.com> Message-Id: <20220601210951.3916598-4-axelrasmussen@google.com> Mime-Version: 1.0 References: <20220601210951.3916598-1-axelrasmussen@google.com> X-Mailer: git-send-email 2.36.1.255.ge46751e96f-goog Subject: [PATCH v3 3/6] userfaultfd: selftests: modify selftest to use /dev/userfaultfd From: Axel Rasmussen To: Alexander Viro , Andrew Morton , Charan Teja Reddy , Dave Hansen , "Dmitry V . Levin" , Gleb Fotengauer-Malinovskiy , Hugh Dickins , Jan Kara , Jonathan Corbet , Mel Gorman , Mike Kravetz , Mike Rapoport , Nadav Amit , Peter Xu , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , zhangyi Cc: Axel Rasmussen , linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b="NeP/OeNW"; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf27.hostedemail.com: domain of 3qdWXYg0KCM4uHy5BuC6ECCy708805y.w86527EH-664Fuw4.8B0@flex--axelrasmussen.bounces.google.com designates 209.85.128.201 as permitted sender) smtp.mailfrom=3qdWXYg0KCM4uHy5BuC6ECCy708805y.w86527EH-664Fuw4.8B0@flex--axelrasmussen.bounces.google.com X-Stat-Signature: bob365afdsgijpifwnjmq6e6z4i1hdeb X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 2D14440055 X-HE-Tag: 1654117798-659223 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: We clearly want to ensure both userfaultfd(2) and /dev/userfaultfd keep working into the future, so just run the test twice, using each interface. Signed-off-by: Axel Rasmussen --- tools/testing/selftests/vm/userfaultfd.c | 37 +++++++++++++++++++++--- 1 file changed, 33 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c index 0bdfc1955229..1badb5d31bf9 100644 --- a/tools/testing/selftests/vm/userfaultfd.c +++ b/tools/testing/selftests/vm/userfaultfd.c @@ -77,6 +77,9 @@ static int bounces; #define TEST_SHMEM 3 static int test_type; +/* test using /dev/userfaultfd, instead of userfaultfd(2) */ +static bool test_dev_userfaultfd; + /* exercise the test_uffdio_*_eexist every ALARM_INTERVAL_SECS */ #define ALARM_INTERVAL_SECS 10 static volatile bool test_uffdio_copy_eexist = true; @@ -154,12 +157,14 @@ static void usage(void) ret, __LINE__); \ } while (0) -#define err(fmt, ...) \ +#define errexit(exitcode, fmt, ...) \ do { \ _err(fmt, ##__VA_ARGS__); \ - exit(1); \ + exit(exitcode); \ } while (0) +#define err(fmt, ...) errexit(1, fmt, ##__VA_ARGS__) + static void uffd_stats_reset(struct uffd_stats *uffd_stats, unsigned long n_cpus) { @@ -383,13 +388,31 @@ static void assert_expected_ioctls_present(uint64_t mode, uint64_t ioctls) } } +static void __userfaultfd_open_dev(void) +{ + int fd; + + uffd = -1; + fd = open("/dev/userfaultfd", O_RDWR | O_CLOEXEC); + if (fd < 0) + return; + + uffd = ioctl(fd, USERFAULTFD_IOC_NEW, + O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY); + close(fd); +} + static void userfaultfd_open(uint64_t *features) { struct uffdio_api uffdio_api; - uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY); + if (test_dev_userfaultfd) + __userfaultfd_open_dev(); + else + uffd = syscall(__NR_userfaultfd, + O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY); if (uffd < 0) - err("userfaultfd syscall not available in this kernel"); + errexit(KSFT_SKIP, "creating userfaultfd failed"); uffd_flags = fcntl(uffd, F_GETFD, NULL); uffdio_api.api = UFFD_API; @@ -1691,6 +1714,12 @@ int main(int argc, char **argv) } printf("nr_pages: %lu, nr_pages_per_cpu: %lu\n", nr_pages, nr_pages_per_cpu); + + test_dev_userfaultfd = false; + if (userfaultfd_stress()) + return 1; + + test_dev_userfaultfd = true; return userfaultfd_stress(); } -- 2.36.1.255.ge46751e96f-goog