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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 47328CD5BAC for ; Sat, 23 May 2026 10:07:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9504E6B0092; Sat, 23 May 2026 06:07:48 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 900986B0095; Sat, 23 May 2026 06:07:48 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7EF3A6B0096; Sat, 23 May 2026 06:07:48 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 677096B0092 for ; Sat, 23 May 2026 06:07:48 -0400 (EDT) Received: from smtpin30.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay09.hostedemail.com (Postfix) with ESMTP id F180093741 for ; Sat, 23 May 2026 10:07:47 +0000 (UTC) X-FDA: 84798258174.30.6FC87B9 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf02.hostedemail.com (Postfix) with ESMTP id 5D85E80002 for ; Sat, 23 May 2026 10:07:46 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=Ee3Xfjg3; spf=pass (imf02.hostedemail.com: domain of rppt@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1779530866; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=rlp1W5vNBlur1QwehE++yDLWhSdLhgpE4g2TYJr/Zrs=; b=xt1MYnxbvMWqTkwUpGWKX7qKWVUAW5aE48NUwDc4cNelD+/4SzpESF/Z4wRMTAVzrcNzgG Zrkqx8zz9u/jLk0aPwcH3gFc9oX+E0b2rAjwpIlV+3LcmhbWpCqojrvnX+gQ6pA4OvoAnM lFm7ANbaWHfQq/AG2uZ7t4gExNzT4jc= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=Ee3Xfjg3; spf=pass (imf02.hostedemail.com: domain of rppt@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1779530866; a=rsa-sha256; cv=none; b=oZBSKYf7zy7gNhm8xTPwGJQjzb/cgFsRfA4MTyk3NNf7xm1dDBSJw9EJx0VhFc35CNqpC8 44mgyQP3NHPipSEW2lHLbBloWmFTLQOuzNqPOkat0e60fwiYThbEZ9y6IAIoLOcQkqFYco 3a/Rdzfk+J57TjcHiWWUvGkrFieuRkg= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 71A7644234; Sat, 23 May 2026 10:07:45 +0000 (UTC) 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> 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> X-Stat-Signature: srfcyhc6b1g39e6k49f3b1z94y4my6mm X-Rspamd-Queue-Id: 5D85E80002 X-Rspamd-Server: rspam07 X-Rspam-User: X-HE-Tag: 1779530866-744177 X-HE-Meta: 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 vkPq8yA+ YZ4duzJsZUG+PV6yNrm0ATDG2Rn9rhfror1DFhB+ds8NaizbptzI7EJCWkQ2Zns319a1GF96tnfK27F7qS2u6xw5D5AFcwkIOSu/CnRN0Dy3UyX5VvIBLxr4PpT1YC47Ob/vQ3cLiSbbQEsn5gp7Nicy305npBtzqbHqEDTnsIOfYEviRef1QifpgxGPKcVrtAyhmiPB3m1KVTtd21gnpvgGEZ/8F0tLNXrr5BZG8AQYGQDk34rj5RYjqqQARWF8/OCQyRw/4DpKgch4BxOxno5pc29SrvnVvcaX9VY18ASVl3jI= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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.