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[2620:137:e000::1:20]) by mx.google.com with ESMTP id u64-20020a637943000000b004cff99eb246si12503028pgc.794.2023.02.02.03.34.42; Thu, 02 Feb 2023 03:34:54 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@collabora.com header.s=mail header.b=LNzRn2uO; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=collabora.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232262AbjBBLbW (ORCPT + 99 others); Thu, 2 Feb 2023 06:31:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55700 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232145AbjBBLaz (ORCPT ); Thu, 2 Feb 2023 06:30:55 -0500 Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D00658C1C9; Thu, 2 Feb 2023 03:30:52 -0800 (PST) Received: from localhost.localdomain (unknown [39.45.165.226]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: usama.anjum) by madras.collabora.co.uk (Postfix) with ESMTPSA id 26B706602EEF; Thu, 2 Feb 2023 11:30:44 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1675337451; bh=rLlyIO3l9/ftTkxvT1S8wXZ6q3zRzsa4+kS1JjkCdaI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LNzRn2uOBHFIIGjgY3mrnWpFZOvFEVEPpbuLkKnjX3xG+zLn36zT+MY+fYEtsxhEN qJ7Jz5qYFS23tEuBe06m4B1Y38T9WnmPUCdseCE2nUs9oorRNPYM/xhi1STGdQBWqR SIiqjkQzIPqKM9vyWQpi8NmK84J6iEIEx2Fz7y54dB2Bl72OiHTdj8IU1e2TO0Lgwx +bgWdPv7XQ8eWYuBePaowISY3eROPepkYhtTMWJh62VZR1ZoWc6G0NkAoI8pROUHEj pAYLdaMZZc/tfvCrKq8mLjxVm1PlHLtInA951+Q+CuG9X4R5Yqmky7cSrsr875cHy9 6zOz9vQak55nQ== From: Muhammad Usama Anjum To: Peter Xu , David Hildenbrand , Andrew Morton , =?utf-8?b?TWljaGHFgiBNaXJvc8WC?= =?utf-8?b?YXc=?= , Andrei Vagin , Danylo Mocherniuk , Paul Gofman , Cyrill Gorcunov Cc: Alexander Viro , Shuah Khan , Christian Brauner , Yang Shi , Vlastimil Babka , "Liam R . Howlett" , Yun Zhou , Suren Baghdasaryan , Alex Sierra , Muhammad Usama Anjum , Matthew Wilcox , Pasha Tatashin , Mike Rapoport , Nadav Amit , Axel Rasmussen , "Gustavo A . R . Silva" , Dan Williams , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Greg KH , kernel@collabora.com Subject: [PATCH v10 5/6] mm/pagemap: add documentation of PAGEMAP_SCAN IOCTL Date: Thu, 2 Feb 2023 16:29:14 +0500 Message-Id: <20230202112915.867409-6-usama.anjum@collabora.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230202112915.867409-1-usama.anjum@collabora.com> References: <20230202112915.867409-1-usama.anjum@collabora.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1756718897783942635?= X-GMAIL-MSGID: =?utf-8?q?1756718897783942635?= Add some explanation and method to use write-protection and written-to on memory range. Signed-off-by: Muhammad Usama Anjum --- Documentation/admin-guide/mm/pagemap.rst | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/Documentation/admin-guide/mm/pagemap.rst b/Documentation/admin-guide/mm/pagemap.rst index 6e2e416af783..1cb2189e9a0d 100644 --- a/Documentation/admin-guide/mm/pagemap.rst +++ b/Documentation/admin-guide/mm/pagemap.rst @@ -230,3 +230,27 @@ Before Linux 3.11 pagemap bits 55-60 were used for "page-shift" (which is always 12 at most architectures). Since Linux 3.11 their meaning changes after first clear of soft-dirty bits. Since Linux 4.2 they are used for flags unconditionally. + +Pagemap Scan IOCTL +================== + +The ``PAGEMAP_SCAN`` IOCTL on the pagemap file can be used to get and/or clear +the info about page table entries. The following operations are supported in +this IOCTL: +- Get the information if the pages have been written-to (``PAGE_IS_WRITTEN``), + file mapped (``PAGE_IS_FILE``), present (``PAGE_IS_PRESENT``) or swapped + (``PAGE_IS_SWAPPED``). +- Write-protect the pages (``PAGEMAP_WP_ENGAGE``) to start finding which + pages have been written-to. +- Find pages which have been written-to and write protect the pages + (atomic ``PAGE_IS_WRITTEN + PAGEMAP_WP_ENGAGE``) + +To get information about which pages have been written-to and/or write protect +the pages, following must be performed first in order: + 1. The userfaultfd file descriptor is created with ``userfaultfd`` syscall. + 2. The ``UFFD_FEATURE_WP_ASYNC`` feature is set by ``UFFDIO_API`` IOCTL. + 3. The memory range is registered with ``UFFDIO_REGISTER_MODE_WP`` mode + through ``UFFDIO_REGISTER`` IOCTL. +Then the any part of the registered memory or the whole memory region can be +write protected using the ``UFFDIO_WRITEPROTECT`` IOCTL or ``PAGEMAP_SCAN`` +IOCTL.