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 9264133121E; Sat, 23 May 2026 10:07:45 +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=1779530866; cv=none; b=kSYZkAlVqU5yDmODk8f7wY9UQlPVkUIn8Wb+1YxrpmRX//nNZSd5PnwwAg106wo89TnwNFD/q/yv2sOAdRVw979cvBm5dodplQgG5lyWXMCYTwpwHA9mZDc+dA4TP1rA1Oh/JbExDwEvqKkKrUdKnaf6dJo+CjPDFbCJ9vshOdc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779530866; c=relaxed/simple; bh=D6nSXEYo+MpnMypr6RgL8yPZAFyIVpwonG2E7ic9SbM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=mkfKhEdtcNU5FoRCxNduyk0S6p5cme+5wnmrcoZbXYQwgAYuB+kQ5wFl4g5kphwAakwDn2s/xlRmBjSSB6potK1KeUhc+v9o3fYaWt1ke6bdiWVdutXYaiAt507O7PRbl7y4/zylwckKL1SRYr3Ptl8o75gkKmkLMhRfVWAeLMM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ee3Xfjg3; 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="Ee3Xfjg3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F9761F000E9; Sat, 23 May 2026 10:07:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779530865; bh=rlp1W5vNBlur1QwehE++yDLWhSdLhgpE4g2TYJr/Zrs=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=Ee3Xfjg3pkY/QBkGfqwUl/vlMPnivycAtzymBvtjnZlKjBwxVCWthpEyBYipSSzTT 7Hb3ZNH2kOFCKNE3qtCT+9Nr7uZYAGjCHz6ZJfQUi7JyzveC6qdztm0snhCDnnwNs7 JCbpv3KNt8AjX+bk84DtiNth6Rg2BdxiP255GajZCvs1fUmt5wjkw34YEykxmjF2mV KcNcTpDapcXZJUh5tth7qD6xH1H5TIORh7sCj9pBmJqolBHW4xuMlHJFSh0CYr24NF aCoObYVnef10OiEUycg02dD9SYvFNY7wMVyYEERHahhqBOpYbYVV9y77qAu1rHLjzC ATNQLHXLaQDGQ== Date: Sat, 23 May 2026 13:07:33 +0300 From: Mike Rapoport To: Kiryl Shutsemau Cc: akpm@linux-foundation.org, peterx@redhat.com, david@kernel.org, ljs@kernel.org, surenb@google.com, vbabka@kernel.org, Liam.Howlett@oracle.com, ziy@nvidia.com, corbet@lwn.net, skhan@linuxfoundation.org, seanjc@google.com, pbonzini@redhat.com, jthoughton@google.com, aarcange@redhat.com, sj@kernel.org, usama.arif@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, kvm@vger.kernel.org, kernel-team@meta.com, linux-man@vger.kernel.org, alx@kernel.org, "Kiryl Shutsemau (Meta)" Subject: Re: [PATCH v3 13/16] selftests/mm: add userfaultfd RWP tests Message-ID: References: <20260522133857.552279-1-kirill@shutemov.name> <20260522133857.552279-14-kirill@shutemov.name> Precedence: bulk X-Mailing-List: linux-man@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260522133857.552279-14-kirill@shutemov.name> On Fri, May 22, 2026 at 02:38:54PM +0100, Kiryl Shutsemau wrote: > From: "Kiryl Shutsemau (Meta)" > > Coverage for UFFDIO_REGISTER_MODE_RWP and UFFDIO_RWPROTECT: > > rwp-async async mode — touch pages, verify permissions are > auto-restored without a message > rwp-sync sync mode — access blocks, handler resolves via > UFFDIO_RWPROTECT > rwp-pagemap PAGEMAP_SCAN reports still-cold pages via > inverted PAGE_IS_ACCESSED > rwp-mprotect RWP survives mprotect(PROT_NONE) -> > mprotect(PROT_READ|PROT_WRITE) round-trip > rwp-gup GUP walks through a protnone RWP PTE (pipe > write/read drives the GUP path) > rwp-async-toggle UFFDIO_SET_MODE flips between sync and async > without re-registering > rwp-close closing the uffd restores page permissions > rwp-fork RWP survives fork() with EVENT_FORK; child's > PTEs keep the uffd bit > rwp-fork-pin RWP survives fork() on an RO-longterm-pinned > anon page (forces copy_present_page()); child > read auto-resolves and clears the bit, proving > PAGE_NONE was in place > rwp-wp-exclusive register with MODE_WP|MODE_RWP returns -EINVAL > > All tests run against anon, shmem, shmem-private, hugetlb, and > hugetlb-private memory, except rwp-fork-pin which is anon-only — > copy_present_page() is the private-anon pinned-exclusive fork path. > > Signed-off-by: Kiryl Shutsemau > Assisted-by: Claude:claude-opus-4-6 Reviewed-by: Mike Rapoport (Microsoft) > --- > tools/testing/selftests/mm/uffd-unit-tests.c | 766 +++++++++++++++++++ > 1 file changed, 766 insertions(+) -- Sincerely yours, Mike.