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Fri, 18 Sep 2026 17:46:43 -0700 (PDT) From: Donggeun Yoo To: akpm@linux-foundation.org, rppt@kernel.org Cc: peterx@redhat.com, surenb@google.com, aarcange@redhat.com, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, mhocko@suse.com, shuah@kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, donggeunyoo.kernel@gmail.com Subject: [PATCH v1 2/2] selftests/mm: add a test for UFFDIO_MOVE of a write-protected swap entry Date: Sat, 19 Sep 2026 09:46:30 +0900 Message-ID: <20260919004630.1159895-3-donggeunyoo.kernel@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260919004630.1159895-1-donggeunyoo.kernel@gmail.com> References: <20260919004630.1159895-1-donggeunyoo.kernel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 9F3D7C0007 X-Stat-Signature: t5x1owsoj46ohof9uurqzourifp38ori X-HE-Tag: 1789778804-671746 X-HE-Meta: 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 RKkLIn+l flt1AXlQFzWt7VoZHKPc7XtOX5D5edWzAFVptwUX+qpjCGxG5IVtIX6/AUhj50zHPL4EmjhWkJFrheEwaQFO7kFyGccITOojE6sSSA2uUJCmoX16DQlVXZVbG5+yvw4ZYFOE/Qp1qWtTafOZewAPUrMKFKwbEfr2ehl80y+SKRfT/8Cr3EnObkr/c0pf4fUfiFoIZgTTSgLHD3PYl7V2slmRgpIrsVDox1JCGokQtgYL9in7g7sfHQ2EDLcuzw8bKYs776yqI9zefAKt4OpKVthMcL0e+KDrMabXvAU7mqTaZheAE1PeC1p8ceOFa7AXMC99M6Wtb5VHjjMjvTWrmX7I7z7HFRy0nXOV4WBCGO7xE1baDjW2hGiNACOxxy770xIF2QMoGiY+KMKAmpGuMefLsPhofRX7ggQIRT6KqEkDPHjOlohFKgbJ7vdZ1vpetHMOtzvN378zWPweqh0u4pWwzc0EAM62tQ21d8KaU3sYeSoglbQ50zbwaH1kYkZMC2NGO9785qJVzLLoCMbExjt0zh0VvSSC+Ogyut/VXmHMHa6gbvJDXUOeLYIa3Cdms1vtq Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Move a swapped-out page out of a write-protected area into a destination registered for missing faults only, and read pagemap bit 57 at the destination. The destination was never write-protected, so the bit must be clear. Signed-off-by: Donggeun Yoo --- tools/testing/selftests/mm/uffd-unit-tests.c | 61 ++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c index ef9b3956bdcf..ae8b718f0a27 100644 --- a/tools/testing/selftests/mm/uffd-unit-tests.c +++ b/tools/testing/selftests/mm/uffd-unit-tests.c @@ -2037,6 +2037,59 @@ static void uffd_move_pmd_split_test(uffd_global_test_opts_t *gopts, uffd_test_a uffd_move_pmd_handle_fault); } +/* + * Moving a swapped-out page out of a write-protected area must not carry the + * uffd-wp bit into a destination that is not write-protect registered: such a + * bit is never cleared afterwards, so pagemap keeps reporting the page as + * uffd-tracked. + * + * Needs a swap device; skipped if MADV_PAGEOUT cannot evict the page. + */ +static void uffd_move_swap_wp_test(uffd_global_test_opts_t *gopts, + uffd_test_args_t *targs) +{ + unsigned long page_size = gopts->page_size; + struct uffdio_move move = { }; + int pagemap_fd, i; + + if (uffd_register(gopts->uffd, gopts->area_src, page_size, + false, true, false)) + err("register src failure"); + if (uffd_register(gopts->uffd, gopts->area_dst, page_size, + true, false, false)) + err("register dst failure"); + + wp_range(gopts->uffd, (unsigned long)gopts->area_src, page_size, true); + + pagemap_fd = pagemap_open(); + for (i = 0; i < 100; i++) { + if (madvise(gopts->area_src, page_size, MADV_PAGEOUT)) + err("MADV_PAGEOUT"); + if (pagemap_is_swapped(pagemap_fd, gopts->area_src)) + break; + usleep(10000); + } + if (!pagemap_is_swapped(pagemap_fd, gopts->area_src)) { + uffd_test_skip("MADV_PAGEOUT did not swap the page; is swap enabled?"); + goto out; + } + + move.dst = (unsigned long)gopts->area_dst; + move.src = (unsigned long)gopts->area_src; + move.len = page_size; + if (ioctl(gopts->uffd, UFFDIO_MOVE, &move)) + err("UFFDIO_MOVE"); + + if (pagemap_get_entry(pagemap_fd, gopts->area_dst) & PM_UFFD_WP) + uffd_test_fail("uffd-wp bit moved into an area that is not write-protected"); + else + uffd_test_pass(); +out: + close(pagemap_fd); + uffd_unregister(gopts->uffd, gopts->area_src, page_size); + uffd_unregister(gopts->uffd, gopts->area_dst, page_size); +} + static bool uffdio_verify_results(const char *name, int ret, int error, long result) { @@ -2359,6 +2412,14 @@ uffd_test_case_t uffd_tests[] = { .uffd_feature_required = UFFD_FEATURE_MOVE, .test_case_ops = &uffd_move_test_pmd_case_ops, }, + { + .name = "move-swap-wp", + .uffd_fn = uffd_move_swap_wp_test, + .mem_targets = MEM_ANON, + .uffd_feature_required = UFFD_FEATURE_MOVE | + UFFD_FEATURE_PAGEFAULT_FLAG_WP, + .test_case_ops = &uffd_move_test_case_ops, + }, { .name = "wp-fork", .uffd_fn = uffd_wp_fork_test, -- 2.53.0