From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 88E7F485CF7; Mon, 28 Sep 2026 08:53:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790585638; cv=none; b=E3tPf6dC9LjvLBgHrS1O5l8QpKbmGPu+viZo3Mw9TLTcybnabkvjtp76nzbJSpf25pCaQW+GrnT0hizjmK0jXxhYZg/hQmeVHyRUVQLy6RZoteKGpb1shmpoqeAEOef4h5tYFQJbwIhS1DgDsFz2wg0xiTukEYpkKUmdUoo8uy4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790585638; c=relaxed/simple; bh=U7p+ll+lx6MHhl2gZLm9ZnSx1Cc3HreKMd2uTg2Ay0U=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=L5iinYQxptRvdOJgj+Q9EaKmwqt3apbVPwrZRi/MQwxEgm65dnlCGKka/Y9HWMZ+ntV+jBF+MdHujvjrrXatOhk9K9LAVYhjejfx2uXcR111pJAiQYeFhxyIoafndIaFf6rFdxzHC1PPdsUdVDYd9Ipk1EoZpnX3Wg8+FF6JYaU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Lc49o/Gj; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Lc49o/Gj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9BFC51F000FF; Mon, 28 Sep 2026 08:53:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790585637; bh=SoMUT2BwfJC5COzbHfnGci4NZdcVm+iQPUkVyhkFY0Y=; h=Date:Subject:From:To:Cc:References:In-Reply-To; b=Lc49o/GjqegLQqj0XCZDeVz5FkD9g8IF9bKFYEUjp4Y3OB81Sw7NlOmJpVplTGR6e YFgr6CsScU19Q6DXfkHkm5D3S+C7znPTicVnirUwx2eG02C13dY2Nr8/mj5mxN2ue3 BPlIybV2xEW0mqgJEyVuDpmtktYJ6wDfnObzWKEpyEQw+2hNjdkjHcZWO6hiE15GVx b6dj/Qoc0EKruxMHbjx9xilKEBDJWVStMT2koRkSebYcosSpP7WMw0vs8kPjcxRD31 Z3rpvKi8lwtcxU3s/2WjY64ryo2hB91DOfvMq6GHoAM/DVawc1gIYfuFhAs+tfCdYM UbcNStzifoHkQ== Message-ID: <4facb8d8-2ccc-4337-bdbf-3e8c03351b7e@kernel.org> Date: Mon, 28 Sep 2026 10:53:49 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/2] selftests/mm: add tests for UFFDIO_MOVE of a uffd-protected swap entry From: "David Hildenbrand (Arm)" To: Donggeun Yoo , akpm@linux-foundation.org, rppt@kernel.org Cc: peterx@redhat.com, surenb@google.com, aarcange@redhat.com, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, mhocko@suse.com, shuah@kernel.org, kirill@shutemov.name, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260926124145.2878520-1-donggeunyoo.kernel@gmail.com> <20260926124145.2878520-3-donggeunyoo.kernel@gmail.com> <4e4223f4-dfec-4e82-97fe-25ae3a3b0f73@kernel.org> Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/28/26 10:53, David Hildenbrand (Arm) wrote: > On 9/26/26 14:41, Donggeun Yoo wrote: >> Move a swapped-out page out of a write-protected or RWP-protected area into >> a destination registered for missing faults only, and read pagemap bit 57 >> at the destination. The destination was never protected, so the bit must >> be clear. >> >> Assisted-by: LLM >> Signed-off-by: Donggeun Yoo >> --- >> tools/testing/selftests/mm/uffd-unit-tests.c | 84 ++++++++++++++++++++ >> 1 file changed, 84 insertions(+) >> >> diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c >> index ef9b3956bdcfd..580178630eded 100644 >> --- a/tools/testing/selftests/mm/uffd-unit-tests.c >> +++ b/tools/testing/selftests/mm/uffd-unit-tests.c >> @@ -2037,6 +2037,75 @@ 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 or RWP-protected area >> + * must not carry the uffd bit into a destination registered for missing >> + * faults only: 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_test_common(uffd_global_test_opts_t *gopts, >> + bool rwp) >> +{ >> + unsigned long page_size = gopts->page_size; >> + struct uffdio_move move = { }; >> + int pagemap_fd; >> + >> + if (rwp) { >> + if (uffd_register_rwp(gopts->uffd, gopts->area_src, page_size)) >> + err("register src failure"); >> + } else if (uffd_register(gopts->uffd, gopts->area_src, page_size, >> + false, true, false)) { >> + err("register src failure"); >> + } > > if () Clicked sent by accident ... let me reply once more. -- Cheers, David