From patchwork Sat Oct 28 00:38:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suren Baghdasaryan X-Patchwork-Id: 13439337 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CA7838F63 for ; Sat, 28 Oct 2023 00:38:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="BeSptafS" Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AACD8D45 for ; Fri, 27 Oct 2023 17:38:34 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-5a909b4e079so23417697b3.2 for ; Fri, 27 Oct 2023 17:38:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1698453514; x=1699058314; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=DPstGiI3zb7PZzW8m1s/TtyE02RR3fMaWMy1rl5jbQE=; b=BeSptafSteAJ1GLueLN5Xs0S9464cQ+bGDix6+RjP+34ekltXa3wkWpIdTTHJr6Oxi hQzW97G8IwhN0NY11Y7fCf3o9LT4dD7Iezc3c1emKdNj6lwrdY87tw/pS7mo8uxFimEp TmWkXce2ZJWeP4ZCaeAm3jljkHHEiaAqRdwFQz52vos3qsswhARr34RI3opDXCU15+KL q2PS8XEks8jIskgBxTYOxTKIF8+uZ6u4GkXUv6tMt24+/3mqL8wSzgyalnx8b4UIBPbO hYFSq88kZ1QITcexW1GNbwenyIP6sdIlk4OhYOr2HD2zpx26YmvwCx85VVStEYvKDI/9 V+bQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698453514; x=1699058314; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=DPstGiI3zb7PZzW8m1s/TtyE02RR3fMaWMy1rl5jbQE=; b=d2PWc4M4GUQpVtVPtpRmdiQztO4bzgWqgHsbvJl7Kwv6FfVNarIj6R6wMra10ylVoE v13WoJt7u/N048dARV0PayKmTTuYBgQjI8gl2/EOVX+h77CFFbdg0pV00WOVnUtQ3ebd Er3ImyXCm7oHacxQ1cYHMWjcEcih4kBR2iuMvqwPfI018J1gWsK/oAj/KXyOPDdRvDvQ siXzuKVQob4elV6JPSQolUPTyv7cnmoDtqsnYNafhBzpq3LGrQ23a50KjusSBmwtirMR 8NvgB847GNraq59k/NgoATyCejlMP6r9IPpHkGpqldVvsns+jtvX0yXBhqruxUii8c6O GwAg== X-Gm-Message-State: AOJu0YxzUZJgkNwKhUaUxxsxM6sjK63WRnFm/LLL7xtzEp7Fius0J+kb SWCHNndpBbGZvXj7QrS/Y0gDn3l1UZU= X-Google-Smtp-Source: AGHT+IHkyagOv7vQjaKfa8YJr6CBe53G6nlWj5O4BlA1iQSMbHSpme2yM6964WYBoEz45GQ9XcUSJSde3/4= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:201:cba3:7e7f:79e4:fa57]) (user=surenb job=sendgmr) by 2002:a81:6d17:0:b0:59b:c6bb:babb with SMTP id i23-20020a816d17000000b0059bc6bbbabbmr87372ywc.6.1698453513868; Fri, 27 Oct 2023 17:38:33 -0700 (PDT) Date: Fri, 27 Oct 2023 17:38:15 -0700 In-Reply-To: <20231028003819.652322-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20231028003819.652322-1-surenb@google.com> X-Mailer: git-send-email 2.42.0.820.g83a721a137-goog Message-ID: <20231028003819.652322-6-surenb@google.com> Subject: [PATCH v4 5/5] selftests/mm: add UFFDIO_MOVE ioctl test From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: viro@zeniv.linux.org.uk, brauner@kernel.org, shuah@kernel.org, aarcange@redhat.com, lokeshgidra@google.com, peterx@redhat.com, david@redhat.com, hughd@google.com, mhocko@suse.com, axelrasmussen@google.com, rppt@kernel.org, willy@infradead.org, Liam.Howlett@oracle.com, jannh@google.com, zhangpeng362@huawei.com, bgeffon@google.com, kaleshsingh@google.com, ngeoffray@google.com, jdduke@google.com, surenb@google.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-team@android.com Add tests for new UFFDIO_MOVE ioctl which uses uffd to move source into destination buffer while checking the contents of both after the move. After the operation the content of the destination buffer should match the original source buffer's content while the source buffer should be zeroed. Separate tests are designed for PMD aligned and unaligned cases because they utilize different code paths in the kernel. Signed-off-by: Suren Baghdasaryan --- tools/testing/selftests/mm/uffd-common.c | 24 ++++ tools/testing/selftests/mm/uffd-common.h | 1 + tools/testing/selftests/mm/uffd-unit-tests.c | 141 +++++++++++++++++++ 3 files changed, 166 insertions(+) diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c index 69e6653ad255..98957fd788d8 100644 --- a/tools/testing/selftests/mm/uffd-common.c +++ b/tools/testing/selftests/mm/uffd-common.c @@ -643,6 +643,30 @@ int copy_page(int ufd, unsigned long offset, bool wp) return __copy_page(ufd, offset, false, wp); } +int move_page(int ufd, unsigned long offset) +{ + struct uffdio_move uffdio_move; + + if (offset >= nr_pages * page_size) + err("unexpected offset %lu\n", offset); + uffdio_move.dst = (unsigned long) area_dst + offset; + uffdio_move.src = (unsigned long) area_src + offset; + uffdio_move.len = page_size; + uffdio_move.mode = UFFDIO_MOVE_MODE_ALLOW_SRC_HOLES; + uffdio_move.move = 0; + if (ioctl(ufd, UFFDIO_MOVE, &uffdio_move)) { + /* real retval in uffdio_move.move */ + if (uffdio_move.move != -EEXIST) + err("UFFDIO_MOVE error: %"PRId64, + (int64_t)uffdio_move.move); + wake_range(ufd, uffdio_move.dst, page_size); + } else if (uffdio_move.move != page_size) { + err("UFFDIO_MOVE error: %"PRId64, (int64_t)uffdio_move.move); + } else + return 1; + return 0; +} + int uffd_open_dev(unsigned int flags) { int fd, uffd; diff --git a/tools/testing/selftests/mm/uffd-common.h b/tools/testing/selftests/mm/uffd-common.h index 19930fd6682b..c9526b2cb6b3 100644 --- a/tools/testing/selftests/mm/uffd-common.h +++ b/tools/testing/selftests/mm/uffd-common.h @@ -121,6 +121,7 @@ void wp_range(int ufd, __u64 start, __u64 len, bool wp); void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_args *args); int __copy_page(int ufd, unsigned long offset, bool retry, bool wp); int copy_page(int ufd, unsigned long offset, bool wp); +int move_page(int ufd, unsigned long offset); void *uffd_poll_thread(void *arg); int uffd_open_dev(unsigned int flags); diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c index debc423bdbf4..89e9529ce941 100644 --- a/tools/testing/selftests/mm/uffd-unit-tests.c +++ b/tools/testing/selftests/mm/uffd-unit-tests.c @@ -1064,6 +1064,133 @@ static void uffd_poison_test(uffd_test_args_t *targs) uffd_test_pass(); } +static void uffd_move_handle_fault( + struct uffd_msg *msg, struct uffd_args *args) +{ + unsigned long offset; + + if (msg->event != UFFD_EVENT_PAGEFAULT) + err("unexpected msg event %u", msg->event); + + if (msg->arg.pagefault.flags & + (UFFD_PAGEFAULT_FLAG_WP | UFFD_PAGEFAULT_FLAG_MINOR | UFFD_PAGEFAULT_FLAG_WRITE)) + err("unexpected fault type %llu", msg->arg.pagefault.flags); + + offset = (char *)(unsigned long)msg->arg.pagefault.address - area_dst; + offset &= ~(page_size-1); + + if (move_page(uffd, offset)) + args->missing_faults++; +} + +static void uffd_move_test(uffd_test_args_t *targs) +{ + unsigned long nr; + pthread_t uffd_mon; + char c; + unsigned long long count; + struct uffd_args args = { 0 }; + + /* Prevent source pages from being mapped more than once */ + if (madvise(area_src, nr_pages * page_size, MADV_DONTFORK)) + err("madvise(MADV_DONTFORK) failure"); + + if (uffd_register(uffd, area_dst, nr_pages * page_size, + true, false, false)) + err("register failure"); + + args.handle_fault = uffd_move_handle_fault; + if (pthread_create(&uffd_mon, NULL, uffd_poll_thread, &args)) + err("uffd_poll_thread create"); + + /* + * Read each of the pages back using the UFFD-registered mapping. We + * expect that the first time we touch a page, it will result in a missing + * fault. uffd_poll_thread will resolve the fault by moving source + * page to destination. + */ + for (nr = 0; nr < nr_pages; nr++) { + /* Check area_src content */ + count = *area_count(area_src, nr); + if (count != count_verify[nr]) + err("nr %lu source memory invalid %llu %llu\n", + nr, count, count_verify[nr]); + + /* Faulting into area_dst should move the page */ + count = *area_count(area_dst, nr); + if (count != count_verify[nr]) + err("nr %lu memory corruption %llu %llu\n", + nr, count, count_verify[nr]); + + /* Re-check area_src content which should be empty */ + count = *area_count(area_src, nr); + if (count != 0) + err("nr %lu move failed %llu %llu\n", + nr, count, count_verify[nr]); + } + + if (write(pipefd[1], &c, sizeof(c)) != sizeof(c)) + err("pipe write"); + if (pthread_join(uffd_mon, NULL)) + err("join() failed"); + + if (args.missing_faults != nr_pages || args.minor_faults != 0) + uffd_test_fail("stats check error"); + else + uffd_test_pass(); +} + +static int prevent_hugepages(void) +{ + /* This should be done before source area is populated */ + if (madvise(area_src, nr_pages * page_size, MADV_NOHUGEPAGE)) { + /* Ignore if CONFIG_TRANSPARENT_HUGEPAGE=n */ + if (errno != EINVAL) + return -errno; + } + return 0; +} + +struct uffd_test_case_ops uffd_move_test_case_ops = { + .post_alloc = prevent_hugepages, +}; + +#define ALIGN_UP(x, align_to) \ + (__typeof__(x))((((unsigned long)(x)) + ((align_to)-1)) & ~((align_to)-1)) + +static char *orig_area_src, *orig_area_dst; +static int pmd_align_areas(void) +{ + orig_area_src = area_src; + orig_area_dst = area_dst; + area_src = ALIGN_UP(area_src, page_size); + area_dst = ALIGN_UP(area_dst, page_size); + nr_pages--; + + return 0; +} + +static void pmd_restore_areas(void) +{ + area_src = orig_area_src; + area_dst = orig_area_dst; + nr_pages++; +} + +static int adjust_page_size(void) +{ + page_size = default_huge_page_size(); + nr_pages = UFFD_TEST_MEM_SIZE / page_size; + + return 0; +} + +struct uffd_test_case_ops uffd_move_pmd_test_case_ops = { + .pre_alloc = adjust_page_size, + .post_alloc = pmd_align_areas, + .pre_release = pmd_restore_areas, +}; + /* * Test the returned uffdio_register.ioctls with different register modes. * Note that _UFFDIO_ZEROPAGE is tested separately in the zeropage test. @@ -1141,6 +1268,20 @@ uffd_test_case_t uffd_tests[] = { .mem_targets = MEM_ALL, .uffd_feature_required = 0, }, + { + .name = "move", + .uffd_fn = uffd_move_test, + .mem_targets = MEM_ANON, + .uffd_feature_required = UFFD_FEATURE_MOVE, + .test_case_ops = &uffd_move_test_case_ops, + }, + { + .name = "move-pmd", + .uffd_fn = uffd_move_test, + .mem_targets = MEM_ANON, + .uffd_feature_required = UFFD_FEATURE_MOVE, + .test_case_ops = &uffd_move_pmd_test_case_ops, + }, { .name = "wp-fork", .uffd_fn = uffd_wp_fork_test,