From patchwork Wed Aug 16 10:38:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muhammad Usama Anjum X-Patchwork-Id: 714242 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E8B0C41513 for ; Wed, 16 Aug 2023 10:39:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243550AbjHPKjM (ORCPT ); Wed, 16 Aug 2023 06:39:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33586 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243566AbjHPKit (ORCPT ); Wed, 16 Aug 2023 06:38:49 -0400 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 A79222684; Wed, 16 Aug 2023 03:38:47 -0700 (PDT) Received: from localhost.localdomain (unknown [59.103.216.185]) (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 24CB8660576C; Wed, 16 Aug 2023 11:38:39 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1692182326; bh=b7U0lW+K/mRzYy3w1T1mtXJROQrF5lz0n6aVM+Gn1JE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Uey+jwdUZF/n3EDNLcHf2EHKS/UQpBsnx+w5JILiTSGkQ4+mKLgheBgqeif7c/I5y nOVGRA6rtGP6ZRbz2QOzO2CCVO8sM714UQDpRa/DQarf/653DgkbVP6jAKuWzzI8LG twPnCX2JdpYRxozKWesxxK6piRN4uiM69bFbyALjdaD9FuDYe1TZ9COmP/OvSbA0Jt b2vpuqzokTjieFtJFsXBqHMq+maa+vQVUJt/mcwoDd2QknJs4yLnuc0jsz/OA4db79 +5tAojiZ/5gorVIW7IPSqwxR0aRum7utuheGKcbqHPMuejx9g9pOpBywNL2LVDpxco 13EisM4dO7zZw== From: Muhammad Usama Anjum To: Peter Xu , Andrew Morton , =?utf-8?b?TWljaGHFgiBNaXJvc8WCYXc=?= , Andrei Vagin , Danylo Mocherniuk , Paul Gofman 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 , 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, Cyrill Gorcunov , Mike Rapoport , Nadav Amit , David Hildenbrand Subject: [PATCH v31 3/6] fs/proc/task_mmu: Add fast paths to get/clear PAGE_IS_WRITTEN flag Date: Wed, 16 Aug 2023 15:38:11 +0500 Message-Id: <20230816103814.1522393-4-usama.anjum@collabora.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230816103814.1522393-1-usama.anjum@collabora.com> References: <20230816103814.1522393-1-usama.anjum@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Adding fast code paths to handle specifically only get and/or clear operation of PAGE_IS_WRITTEN, increases its performance by 0-35%. The results of some test cases are given below: Test-case-1 t1 = (Get + WP) time t2 = WP time t1 t2 Without this patch: 140-170mcs 90-115mcs With this patch: 110mcs 80mcs Worst case diff: 35% faster 30% faster Test-case-2 t3 = atomic Get and WP t3 Without this patch: 120-140mcs With this patch: 100-110mcs Worst case diff: 21% faster Signed-off-by: Muhammad Usama Anjum --- The test to measure the performance can be found: https://is.gd/FtSKcD 8 8192 3 1 0 and 8 8192 3 1 1 arguments have been used to produce the above mentioned results. Changes in v29: - Minor updates in flush logic following the original patch --- fs/proc/task_mmu.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 62950f3cafc7c..b780fe01d54ca 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -2121,6 +2121,41 @@ static int pagemap_scan_pmd_entry(pmd_t *pmd, unsigned long start, return 0; } + if (!p->vec_out) { + /* Fast path for performing exclusive WP */ + for (addr = start; addr != end; pte++, addr += PAGE_SIZE) { + if (pte_uffd_wp(ptep_get(pte))) + continue; + make_uffd_wp_pte(vma, addr, pte); + if (!flush_end) + start = addr; + flush_end = addr + PAGE_SIZE; + } + goto flush_and_return; + } + + if (!p->arg.category_anyof_mask && !p->arg.category_inverted && + p->arg.category_mask == PAGE_IS_WRITTEN && + p->arg.return_mask == PAGE_IS_WRITTEN) { + for (addr = start; addr < end; pte++, addr += PAGE_SIZE) { + unsigned long next = addr + PAGE_SIZE; + + if (pte_uffd_wp(ptep_get(pte))) + continue; + ret = pagemap_scan_output(p->cur_vma_category | PAGE_IS_WRITTEN, + p, addr, &next); + if (next == addr) + break; + if (~p->arg.flags & PM_SCAN_WP_MATCHING) + continue; + make_uffd_wp_pte(vma, addr, pte); + if (!flush_end) + start = addr; + flush_end = next; + } + goto flush_and_return; + } + for (addr = start; addr != end; pte++, addr += PAGE_SIZE) { unsigned long categories = p->cur_vma_category | pagemap_page_category(p, vma, addr, ptep_get(pte)); @@ -2144,6 +2179,7 @@ static int pagemap_scan_pmd_entry(pmd_t *pmd, unsigned long start, flush_end = next; } +flush_and_return: if (flush_end) flush_tlb_range(vma, start, addr); From patchwork Wed Aug 16 10:38:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muhammad Usama Anjum X-Patchwork-Id: 714241 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E0A23C001DF for ; Wed, 16 Aug 2023 10:39:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243556AbjHPKjN (ORCPT ); Wed, 16 Aug 2023 06:39:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243940AbjHPKjC (ORCPT ); Wed, 16 Aug 2023 06:39:02 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8B6211FCE; Wed, 16 Aug 2023 03:39:01 -0700 (PDT) Received: from localhost.localdomain (unknown [59.103.216.185]) (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 01F1F660576C; Wed, 16 Aug 2023 11:38:52 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1692182340; bh=++7ZMwIn+CSvHBOzFMinKuXCGuCZi9t/HjmM0x59zug=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e3iHgjp0vz9wb4y6oDGqUJ53iDYFi2QhrvI77g/46Wr0AYyfY7MTQsZwRobS23htp WwmJaSGlwPUo4mw+QhcURfqIIeZS0G4Zry7EqsW8UVRyWbJbOV3tgBDUoUcITUy1x1 lJicOg2Q4QzRvGzgN4CJ2TFOx0V1xGc1gKnV4S2wjTv5K8DH41j8UeYsqpWgFQGNrn Bl5tGdofZFuVJPjx1Cg0ooR5UeoGf0YedD+BRhitd66eAwrsnAY9QhmWry3btRbk7e 95RmpnJVpkIGNMcBWO6lkyVV3f83eQsyozb6wXgL9lltBkJx3UwB0/AqeykhpWSdPE zhad2yZYQGYMQ== From: Muhammad Usama Anjum To: Peter Xu , Andrew Morton , =?utf-8?b?TWljaGHFgiBNaXJvc8WCYXc=?= , Andrei Vagin , Danylo Mocherniuk , Paul Gofman 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 , 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, Cyrill Gorcunov , Mike Rapoport , Nadav Amit , David Hildenbrand Subject: [PATCH v31 5/6] mm/pagemap: add documentation of PAGEMAP_SCAN IOCTL Date: Wed, 16 Aug 2023 15:38:13 +0500 Message-Id: <20230816103814.1522393-6-usama.anjum@collabora.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230816103814.1522393-1-usama.anjum@collabora.com> References: <20230816103814.1522393-1-usama.anjum@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add some explanation and method to use write-protection and written-to on memory range. Signed-off-by: Muhammad Usama Anjum --- Changes in v30: - Minor changes Changes in v29: - Revamp the documentation and make it better Changes in v26: - Update documentation according to latest revision Changes in v21: - Update according to changed interface Changes in v20: - Add new flag in documentation Changes in v19: - Improved documentatiom with punctuation marks Changes in v16: - Update the documentation Changes in v11: - Add more documentation --- Documentation/admin-guide/mm/pagemap.rst | 89 ++++++++++++++++++++++++ 1 file changed, 89 insertions(+) diff --git a/Documentation/admin-guide/mm/pagemap.rst b/Documentation/admin-guide/mm/pagemap.rst index c8f380271cad8..fe17cf2104265 100644 --- a/Documentation/admin-guide/mm/pagemap.rst +++ b/Documentation/admin-guide/mm/pagemap.rst @@ -227,3 +227,92 @@ 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 or optionally +clear the info about page table entries. The following operations are supported +in this IOCTL: + +- Scan the address range and get the memory ranges matching the provided criteria. + This is performed when the output buffer is specified. +- Write-protect the pages. The ``PM_SCAN_WP_MATCHING`` is used to write-protect + the pages of interest. The ``PM_SCAN_CHECK_WPASYNC`` aborts the operation if + non-Async Write Protected pages are found. The ``PM_SCAN_WP_MATCHING`` can be + used with or without ``PM_SCAN_CHECK_WPASYNC``. +- Both of those operations can be combined into one atomic operation where we can + get and write protect the pages as well. + +Following flags about pages are currently supported: + +- ``PAGE_IS_WPALLOWED`` - Page has async-write-protection enabled +- ``PAGE_IS_WRITTEN`` - Page has been written to from the time it was write protected +- ``PAGE_IS_FILE`` - Page is file backed +- ``PAGE_IS_PRESENT`` - Page is present in the memory +- ``PAGE_IS_SWAPPED`` - Page is in swapped +- ``PAGE_IS_PFNZERO`` - Page has zero PFN +- ``PAGE_IS_HUGE`` - Page is THP or Hugetlb backed + +The ``struct pm_scan_arg`` is used as the argument of the IOCTL. + + 1. The size of the ``struct pm_scan_arg`` must be specified in the ``size`` + field. This field will be helpful in recognizing the structure if extensions + are done later. + 2. The flags can be specified in the ``flags`` field. The ``PM_SCAN_WP_MATCHING`` + and ``PM_SCAN_CHECK_WPASYNC`` are the only added flags at this time. The get + operation is optionally performed depending upon if the output buffer is + provided or not. + 3. The range is specified through ``start`` and ``end``. + 4. The walk can abort before visiting the complete range such as the user buffer + can get full etc. The walk ending address is specified in``end_walk``. + 5. The output buffer of ``struct page_region`` array and size is specified in + ``vec`` and ``vec_len``. + 6. The optional maximum requested pages are specified in the ``max_pages``. + 7. The masks are specified in ``category_mask``, ``category_anyof_mask``, + ``category_inverted`` and ``return_mask``. + +Find pages which have been written and WP them as well:: + + struct pm_scan_arg arg = { + .size = sizeof(arg), + .flags = PM_SCAN_CHECK_WPASYNC | PM_SCAN_CHECK_WPASYNC, + .. + .category_mask = PAGE_IS_WRITTEN, + .return_mask = PAGE_IS_WRITTEN, + }; + +Find pages which have been written, are file backed, not swapped and either +present or huge:: + + struct pm_scan_arg arg = { + .size = sizeof(arg), + .flags = 0, + .. + .category_mask = PAGE_IS_WRITTEN | PAGE_IS_SWAPPED, + .category_inverted = PAGE_IS_SWAPPED, + .category_anyof_mask = PAGE_IS_PRESENT | PAGE_IS_HUGE, + .return_mask = PAGE_IS_WRITTEN | PAGE_IS_SWAPPED | + PAGE_IS_PRESENT | PAGE_IS_HUGE, + }; + +The ``PAGE_IS_WRITTEN`` flag can be considered as a better-performing alternative +of soft-dirty flag. It doesn't get affected by VMA merging of the kernel and hence +the user can find the true soft-dirty pages in case of normal pages. (There may +still be extra dirty pages reported for THP or Hugetlb pages.) + +"PAGE_IS_WRITTEN" category is used with uffd write protect-enabled ranges to +implement memory dirty tracking in userspace: + + 1. The userfaultfd file descriptor is created with ``userfaultfd`` syscall. + 2. The ``UFFD_FEATURE_WP_UNPOPULATED`` and ``UFFD_FEATURE_WP_ASYNC`` features + are set by ``UFFDIO_API`` IOCTL. + 3. The memory range is registered with ``UFFDIO_REGISTER_MODE_WP`` mode + through ``UFFDIO_REGISTER`` IOCTL. + 4. Then any part of the registered memory or the whole memory region must + be write protected using ``PAGEMAP_SCAN`` IOCTL with flag ``PM_SCAN_WP_MATCHING`` + or the ``UFFDIO_WRITEPROTECT`` IOCTL can be used. Both of these perform the + same operation. The former is better in terms of performance. + 5. Now the ``PAGEMAP_SCAN`` IOCTL can be used to either just find pages which + have been written to since they were last marked and/or optionally write protect + the pages as well. From patchwork Wed Aug 16 10:38:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muhammad Usama Anjum X-Patchwork-Id: 714240 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3AE3DC001B0 for ; Wed, 16 Aug 2023 10:40:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243569AbjHPKjo (ORCPT ); Wed, 16 Aug 2023 06:39:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243677AbjHPKjR (ORCPT ); Wed, 16 Aug 2023 06:39:17 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 50F31211E; Wed, 16 Aug 2023 03:39:12 -0700 (PDT) Received: from localhost.localdomain (unknown [59.103.216.185]) (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 D66DD66071F8; Wed, 16 Aug 2023 11:39:00 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1692182351; bh=zD3rT/12n3qixSTa7BTZlTmpeU5C3ZpPTmch7Vr+sT0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c9lCyrSFkry3CFuXVOOgpd6L+34WsDS4gkfFCVgOFotRDhfBCsNMAye+YQF96l2Ax sMyG3A07bJWQGrKGx0MxfN2dA2UGBsEj/orkQRO3d454PzheSapjGS77H4810pOi4h AE5Zj9bu7z/ewL8rH8IvCyVC2bQd2G6be0k6nBKqGtyoSNUAShZi0DRkiCu+3MCH8W aw4CgIyBZWWG4RppSZEdYn6+DMR8h7vR0TvHPkRhs0jj50tXsYWF+AmRA8SMe6UUnx XEnWCH4NYzJOYImLGco2ZlQYMFncnjHvcm7Ujt04C0LK7CCSgnilFMvMDQ17haSwFu /UMGcEs442R9g== From: Muhammad Usama Anjum To: Peter Xu , Andrew Morton , =?utf-8?b?TWljaGHFgiBNaXJvc8WCYXc=?= , Andrei Vagin , Danylo Mocherniuk , Paul Gofman 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 , 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, Cyrill Gorcunov , Mike Rapoport , Nadav Amit , David Hildenbrand Subject: [PATCH v31 6/6] selftests: mm: add pagemap ioctl tests Date: Wed, 16 Aug 2023 15:38:14 +0500 Message-Id: <20230816103814.1522393-7-usama.anjum@collabora.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230816103814.1522393-1-usama.anjum@collabora.com> References: <20230816103814.1522393-1-usama.anjum@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add pagemap ioctl tests. Add several different types of tests to judge the correction of the interface. Signed-off-by: Muhammad Usama Anjum --- Changes in v30: - Rebase on top of next-20230815 and resolved conflict on Makefile Changes in v29: - Minor improvements and new tests Changes in v28: - Add walk_end tests Changes in v27: - Open the pagemap file with O_RDONLY - Use UFFD_USER_MODE_ONLY flag for userfaultfd() syscall Changes in v26: - Updates Changes in v19: - Incorporated interface changes and update tests Changes in v18: - Rebase on top of 20230613 (Resolve conflict in Makefile) - Add temp files to .gitignore Changes in v17: - Rebase on top of next-20230525 Changes in v16: - Added yet more tests which is a randomization test case to catch the corner cases - Add reset by exclusive PM_SCAN_OP_WP as well Changes in v13: - Update tests and rebase Makefile Changes in v12: - Updates and add more memory type tests Changes in v11: - Rebase on top of next-20230216 and update tests Chages in v7: - Add and update all test cases Changes in v6: - Rename variables Changes in v4: - Updated all the tests to conform to new IOCTL Changes in v3: - Add another test to do sanity of flags Changes in v2: - Update the tests to use the ioctl interface instead of syscall --- TAP version 13 1..108 ok 1 sanity_tests_sd Zero range size is valid ok 2 sanity_tests_sd output buffer must be specified with size ok 3 sanity_tests_sd output buffer can be 0 ok 4 sanity_tests_sd wrong flag specified ok 5 sanity_tests_sd flag has extra bits specified ok 6 sanity_tests_sd no selection mask is specified ok 7 sanity_tests_sd no return mask is specified ok 8 sanity_tests_sd wrong return mask specified ok 9 sanity_tests_sd mixture of correct and wrong flag ok 10 sanity_tests_sd PAGEMAP_BITS_ALL can be specified with PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC ok 11 sanity_tests_sd Clear area with larger vec size ok 12 sanity_tests_sd Repeated pattern of written and non-written pages ok 13 sanity_tests_sd Repeated pattern of written and non-written pages in parts 3 2 2 ok 14 sanity_tests_sd Repeated pattern of written and non-written pages max_pages ok 15 sanity_tests_sd only get 2 written pages and clear them as well ok 16 sanity_tests_sd Two regions ok 17 sanity_tests_sd Smaller max_pages ok 18 Smaller vec ok 19 Walk_end: Same start and end address ok 20 Walk_end: Same start and end with WP ok 21 Walk_end: Same start and end with 0 output buffer ok 22 Walk_end: Big vec ok 23 Walk_end: vec of minimum length ok 24 Walk_end: Max pages specified ok 25 Walk_end: Half max pages ok 26 Walk_end: 1 max page ok 27 Walk_end: max pages ok 28 Walk_end sparse: Big vec ok 29 Walk_end sparse: vec of minimum length ok 30 Walk_end sparse: Max pages specified ok 31 Walk_end sparse: Max pages specified ok 32 Walk_end sparse: Max pages specified ok 33 Walk_endsparse : Half max pages ok 34 Walk_end: 1 max page ok 35 Page testing: all new pages must not be written (dirty) ok 36 Page testing: all pages must be written (dirty) ok 37 Page testing: all pages dirty other than first and the last one ok 38 Page testing: PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC ok 39 Page testing: only middle page dirty ok 40 Page testing: only two middle pages dirty ok 41 Large Page testing: all new pages must not be written (dirty) ok 42 Large Page testing: all pages must be written (dirty) ok 43 Large Page testing: all pages dirty other than first and the last one ok 44 Large Page testing: PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC ok 45 Large Page testing: only middle page dirty ok 46 Large Page testing: only two middle pages dirty ok 47 Huge page testing: all new pages must not be written (dirty) ok 48 Huge page testing: all pages must be written (dirty) ok 49 Huge page testing: all pages dirty other than first and the last one ok 50 Huge page testing: PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC ok 51 Huge page testing: only middle page dirty ok 52 Huge page testing: only two middle pages dirty ok 53 Hugetlb shmem testing: all new pages must not be written (dirty) ok 54 Hugetlb shmem testing: all pages must be written (dirty) ok 55 Hugetlb shmem testing: all pages dirty other than first and the last one ok 56 Hugetlb shmem testing: PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC ok 57 Hugetlb shmem testing: only middle page dirty ok 58 Hugetlb shmem testing: only two middle pages dirty ok 59 Hugetlb mem testing: all new pages must not be written (dirty) ok 60 Hugetlb mem testing: all pages must be written (dirty) ok 61 Hugetlb mem testing: all pages dirty other than first and the last one ok 62 Hugetlb mem testing: PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC ok 63 Hugetlb mem testing: only middle page dirty ok 64 Hugetlb mem testing: only two middle pages dirty ok 65 File memory testing: all new pages must not be written (dirty) ok 66 File memory testing: all pages must be written (dirty) ok 67 File memory testing: all pages dirty other than first and the last one ok 68 File memory testing: PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC ok 69 File memory testing: only middle page dirty ok 70 File memory testing: only two middle pages dirty ok 71 File anonymous memory testing: all new pages must not be written (dirty) ok 72 File anonymous memory testing: all pages must be written (dirty) ok 73 File anonymous memory testing: all pages dirty other than first and the last one ok 74 File anonymous memory testing: PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC ok 75 File anonymous memory testing: only middle page dirty ok 76 File anonymous memory testing: only two middle pages dirty ok 77 hpage_unit_tests all new huge page must not be written (dirty) ok 78 hpage_unit_tests all the huge page must not be written ok 79 hpage_unit_tests all the huge page must be written and clear ok 80 hpage_unit_tests only middle page written ok 81 hpage_unit_tests clear first half of huge page ok 82 hpage_unit_tests clear first half of huge page with limited buffer ok 83 hpage_unit_tests clear second half huge page ok 84 hpage_unit_tests get half huge page ok 85 hpage_unit_tests get half huge page ok 86 Test test_simple ok 87 mprotect_tests Both pages written ok 88 mprotect_tests Both pages are not written (dirty) ok 89 mprotect_tests Both pages written after remap and mprotect ok 90 mprotect_tests Clear and make the pages written ok 91 transact_test count 192 ok 92 transact_test count 0 ok 93 transact_test Extra pages 1 (0.0%), extra thread faults 1. ok 94 sanity_tests WP op can be specified with !PAGE_IS_WRITTEN ok 95 sanity_tests required_mask specified ok 96 sanity_tests anyof_mask specified ok 97 sanity_tests excluded_mask specified ok 98 sanity_tests required_mask and anyof_mask specified ok 99 sanity_tests Get sd and present pages with anyof_mask ok 100 sanity_tests Get all the pages with required_mask ok 101 sanity_tests Get sd and present pages with required_mask and anyof_mask ok 102 sanity_tests Don't get sd pages ok 103 sanity_tests Don't get present pages ok 104 sanity_tests Find written present pages with return mask ok 105 sanity_tests Memory mapped file ok 106 sanity_tests Read/write to memory ok 107 unmapped_region_tests Get status of pages ok 108 userfaultfd_tests all new pages must not be written (dirty) # Totals: pass:108 fail:0 xfail:0 xpass:0 skip:0 error:0 selftests --- tools/testing/selftests/mm/.gitignore | 2 + tools/testing/selftests/mm/Makefile | 3 +- tools/testing/selftests/mm/config | 1 + tools/testing/selftests/mm/pagemap_ioctl.c | 1660 ++++++++++++++++++++ tools/testing/selftests/mm/run_vmtests.sh | 4 + 5 files changed, 1669 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/mm/pagemap_ioctl.c diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore index cdc9ce4426b95..cc920c79ff1c3 100644 --- a/tools/testing/selftests/mm/.gitignore +++ b/tools/testing/selftests/mm/.gitignore @@ -18,6 +18,8 @@ mremap_dontunmap mremap_test on-fault-limit transhuge-stress +pagemap_ioctl +*.tmp* protection_keys protection_keys_32 protection_keys_64 diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile index 6a9fc5693145f..2a89989afafc6 100644 --- a/tools/testing/selftests/mm/Makefile +++ b/tools/testing/selftests/mm/Makefile @@ -33,7 +33,7 @@ endif MAKEFLAGS += --no-builtin-rules CFLAGS = -Wall -I $(top_srcdir) $(EXTRA_CFLAGS) $(KHDR_INCLUDES) -LDLIBS = -lrt -lpthread +LDLIBS = -lrt -lpthread -lm TEST_GEN_FILES = cow TEST_GEN_FILES += compaction_test @@ -60,6 +60,7 @@ TEST_GEN_FILES += mrelease_test TEST_GEN_FILES += mremap_dontunmap TEST_GEN_FILES += mremap_test TEST_GEN_FILES += on-fault-limit +TEST_GEN_PROGS += pagemap_ioctl TEST_GEN_FILES += thuge-gen TEST_GEN_FILES += transhuge-stress TEST_GEN_FILES += uffd-stress diff --git a/tools/testing/selftests/mm/config b/tools/testing/selftests/mm/config index be087c4bc3961..4309916f629e3 100644 --- a/tools/testing/selftests/mm/config +++ b/tools/testing/selftests/mm/config @@ -1,5 +1,6 @@ CONFIG_SYSVIPC=y CONFIG_USERFAULTFD=y +CONFIG_PTE_MARKER_UFFD_WP=y CONFIG_TEST_VMALLOC=m CONFIG_DEVICE_PRIVATE=y CONFIG_TEST_HMM=m diff --git a/tools/testing/selftests/mm/pagemap_ioctl.c b/tools/testing/selftests/mm/pagemap_ioctl.c new file mode 100644 index 0000000000000..0161fb49fc6ef --- /dev/null +++ b/tools/testing/selftests/mm/pagemap_ioctl.c @@ -0,0 +1,1660 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include "vm_util.h" +#include "../kselftest.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PAGEMAP_BITS_ALL (PAGE_IS_WPALLOWED | PAGE_IS_WRITTEN | \ + PAGE_IS_FILE | PAGE_IS_PRESENT | \ + PAGE_IS_SWAPPED | PAGE_IS_PFNZERO | \ + PAGE_IS_HUGE) +#define PAGEMAP_NON_WRITTEN_BITS (PAGE_IS_WPALLOWED | PAGE_IS_FILE | \ + PAGE_IS_PRESENT | PAGE_IS_SWAPPED | \ + PAGE_IS_PFNZERO | PAGE_IS_HUGE) + +#define TEST_ITERATIONS 100 +#define PAGEMAP "/proc/self/pagemap" +int pagemap_fd; +int uffd; +int page_size; +int hpage_size; + +#define LEN(region) ((region.end - region.start)/page_size) + +static long pagemap_ioctl(void *start, int len, void *vec, int vec_len, int flag, + int max_pages, long required_mask, long anyof_mask, long excluded_mask, + long return_mask) +{ + struct pm_scan_arg arg; + + arg.start = (uintptr_t)start; + arg.end = (uintptr_t)(start + len); + arg.vec = (uintptr_t)vec; + arg.vec_len = vec_len; + arg.flags = flag; + arg.size = sizeof(struct pm_scan_arg); + arg.max_pages = max_pages; + arg.category_mask = required_mask; + arg.category_anyof_mask = anyof_mask; + arg.category_inverted = excluded_mask; + arg.return_mask = return_mask; + + return ioctl(pagemap_fd, PAGEMAP_SCAN, &arg); +} + +static long pagemap_ioc(void *start, int len, void *vec, int vec_len, int flag, + int max_pages, long required_mask, long anyof_mask, long excluded_mask, + long return_mask, long *walk_end) +{ + struct pm_scan_arg arg; + int ret; + + arg.start = (uintptr_t)start; + arg.end = (uintptr_t)(start + len); + arg.vec = (uintptr_t)vec; + arg.vec_len = vec_len; + arg.flags = flag; + arg.size = sizeof(struct pm_scan_arg); + arg.max_pages = max_pages; + arg.category_mask = required_mask; + arg.category_anyof_mask = anyof_mask; + arg.category_inverted = excluded_mask; + arg.return_mask = return_mask; + + ret = ioctl(pagemap_fd, PAGEMAP_SCAN, &arg); + + if (walk_end) + *walk_end = arg.walk_end; + + return ret; +} + + +int init_uffd(void) +{ + struct uffdio_api uffdio_api; + + uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY); + if (uffd == -1) + ksft_exit_fail_msg("uffd syscall failed\n"); + + uffdio_api.api = UFFD_API; + uffdio_api.features = UFFD_FEATURE_WP_UNPOPULATED | UFFD_FEATURE_WP_ASYNC | + UFFD_FEATURE_WP_HUGETLBFS_SHMEM; + if (ioctl(uffd, UFFDIO_API, &uffdio_api)) + ksft_exit_fail_msg("UFFDIO_API\n"); + + if (!(uffdio_api.api & UFFDIO_REGISTER_MODE_WP) || + !(uffdio_api.features & UFFD_FEATURE_WP_UNPOPULATED) || + !(uffdio_api.features & UFFD_FEATURE_WP_ASYNC) || + !(uffdio_api.features & UFFD_FEATURE_WP_HUGETLBFS_SHMEM)) + ksft_exit_fail_msg("UFFDIO_API error %llu\n", uffdio_api.api); + + return 0; +} + +int wp_init(void *lpBaseAddress, int dwRegionSize) +{ + struct uffdio_register uffdio_register; + struct uffdio_writeprotect wp; + + uffdio_register.range.start = (unsigned long)lpBaseAddress; + uffdio_register.range.len = dwRegionSize; + uffdio_register.mode = UFFDIO_REGISTER_MODE_WP; + if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register)) + ksft_exit_fail_msg("ioctl(UFFDIO_REGISTER) %d %s\n", errno, strerror(errno)); + + if (!(uffdio_register.ioctls & UFFDIO_WRITEPROTECT)) + ksft_exit_fail_msg("ioctl set is incorrect\n"); + + wp.range.start = (unsigned long)lpBaseAddress; + wp.range.len = dwRegionSize; + wp.mode = UFFDIO_WRITEPROTECT_MODE_WP; + + if (ioctl(uffd, UFFDIO_WRITEPROTECT, &wp)) + ksft_exit_fail_msg("ioctl(UFFDIO_WRITEPROTECT)\n"); + + return 0; +} + +int wp_free(void *lpBaseAddress, int dwRegionSize) +{ + struct uffdio_register uffdio_register; + + uffdio_register.range.start = (unsigned long)lpBaseAddress; + uffdio_register.range.len = dwRegionSize; + uffdio_register.mode = UFFDIO_REGISTER_MODE_WP; + if (ioctl(uffd, UFFDIO_UNREGISTER, &uffdio_register.range)) + ksft_exit_fail_msg("ioctl unregister failure\n"); + return 0; +} + +int wp_addr_range(void *lpBaseAddress, int dwRegionSize) +{ + if (pagemap_ioctl(lpBaseAddress, dwRegionSize, NULL, 0, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) < 0) + ksft_exit_fail_msg("error %d %d %s\n", 1, errno, strerror(errno)); + + return 0; +} + +void *gethugetlb_mem(int size, int *shmid) +{ + char *mem; + + if (shmid) { + *shmid = shmget(2, size, SHM_HUGETLB | IPC_CREAT | SHM_R | SHM_W); + if (*shmid < 0) + return NULL; + + mem = shmat(*shmid, 0, 0); + if (mem == (char *)-1) { + shmctl(*shmid, IPC_RMID, NULL); + ksft_exit_fail_msg("Shared memory attach failure\n"); + } + } else { + mem = mmap(NULL, size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_HUGETLB | MAP_PRIVATE, -1, 0); + if (mem == MAP_FAILED) + return NULL; + } + + return mem; +} + +int userfaultfd_tests(void) +{ + int mem_size, vec_size, written, num_pages = 16; + char *mem, *vec; + + mem_size = num_pages * page_size; + mem = mmap(NULL, mem_size, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + + wp_init(mem, mem_size); + + /* Change protection of pages differently */ + mprotect(mem, mem_size/8, PROT_READ|PROT_WRITE); + mprotect(mem + 1 * mem_size/8, mem_size/8, PROT_READ); + mprotect(mem + 2 * mem_size/8, mem_size/8, PROT_READ|PROT_WRITE); + mprotect(mem + 3 * mem_size/8, mem_size/8, PROT_READ); + mprotect(mem + 4 * mem_size/8, mem_size/8, PROT_READ|PROT_WRITE); + mprotect(mem + 5 * mem_size/8, mem_size/8, PROT_NONE); + mprotect(mem + 6 * mem_size/8, mem_size/8, PROT_READ|PROT_WRITE); + mprotect(mem + 7 * mem_size/8, mem_size/8, PROT_READ); + + wp_addr_range(mem + (mem_size/16), mem_size - 2 * (mem_size/8)); + wp_addr_range(mem, mem_size); + + vec_size = mem_size/page_size; + vec = malloc(sizeof(struct page_region) * vec_size); + + written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + vec_size - 2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + ksft_test_result(written == 0, "%s all new pages must not be written (dirty)\n", __func__); + + wp_free(mem, mem_size); + munmap(mem, mem_size); + free(vec); + return 0; +} + +int get_reads(struct page_region *vec, int vec_size) +{ + int i, sum = 0; + + for (i = 0; i < vec_size; i++) + sum += LEN(vec[i]); + + return sum; +} + +int sanity_tests_sd(void) +{ + int mem_size, vec_size, ret, ret2, ret3, i, num_pages = 1000, total_pages = 0; + int total_writes, total_reads, reads, count; + struct page_region *vec, *vec2; + char *mem, *m[2]; + long walk_end; + + vec_size = num_pages/2; + mem_size = num_pages * page_size; + + vec = malloc(sizeof(struct page_region) * vec_size); + if (!vec) + ksft_exit_fail_msg("error nomem\n"); + + vec2 = malloc(sizeof(struct page_region) * vec_size); + if (!vec2) + ksft_exit_fail_msg("error nomem\n"); + + mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + /* 1. wrong operation */ + ksft_test_result(pagemap_ioctl(mem, 0, vec, vec_size, 0, + 0, PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) == 0, + "%s Zero range size is valid\n", __func__); + + ksft_test_result(pagemap_ioctl(mem, mem_size, NULL, vec_size, 0, + 0, PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) < 0, + "%s output buffer must be specified with size\n", __func__); + + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, 0, 0, + 0, PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) == 0, + "%s output buffer can be 0\n", __func__); + + ksft_test_result(pagemap_ioctl(mem, mem_size, 0, 0, 0, + 0, PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) == 0, + "%s output buffer can be 0\n", __func__); + + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, -1, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) < 0, + "%s wrong flag specified\n", __func__); + + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC | 0xFF, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) < 0, + "%s flag has extra bits specified\n", __func__); + + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, + 0, 0, 0, 0, PAGE_IS_WRITTEN) >= 0, + "%s no selection mask is specified\n", __func__); + + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, + 0, PAGE_IS_WRITTEN, PAGE_IS_WRITTEN, 0, 0) == 0, + "%s no return mask is specified\n", __func__); + + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, + 0, PAGE_IS_WRITTEN, 0, 0, 0x1000) < 0, + "%s wrong return mask specified\n", __func__); + + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, 0xFFF, PAGE_IS_WRITTEN, 0, PAGE_IS_WRITTEN) < 0, + "%s mixture of correct and wrong flag\n", __func__); + + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, 0, 0, PAGEMAP_BITS_ALL, PAGE_IS_WRITTEN) >= 0, + "%s PAGEMAP_BITS_ALL can be specified with PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC\n", + __func__); + + /* 2. Clear area with larger vec size */ + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + ksft_test_result(ret >= 0, "%s Clear area with larger vec size\n", __func__); + + /* 3. Repeated pattern of written and non-written pages */ + for (i = 0; i < mem_size; i += 2 * page_size) + mem[i]++; + + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, PAGE_IS_WRITTEN, 0, + 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == mem_size/(page_size * 2), + "%s Repeated pattern of written and non-written pages\n", __func__); + + /* 4. Repeated pattern of written and non-written pages in parts */ + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + num_pages/2 - 2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ret2 = pagemap_ioctl(mem, mem_size, vec, 2, 0, 0, PAGE_IS_WRITTEN, 0, 0, + PAGE_IS_WRITTEN); + if (ret2 < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret2, errno, strerror(errno)); + + ret3 = pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret3 < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret3, errno, strerror(errno)); + + ksft_test_result((ret + ret3) == num_pages/2 && ret2 == 2, + "%s Repeated pattern of written and non-written pages in parts %d %d %d\n", + __func__, ret, ret3, ret2); + + /* 5. Repeated pattern of written and non-written pages max_pages */ + for (i = 0; i < mem_size; i += 2 * page_size) + mem[i]++; + mem[(mem_size/page_size - 1) * page_size]++; + + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + num_pages/2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ret2 = pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret2 < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret2, errno, strerror(errno)); + + ksft_test_result(ret == num_pages/2 && ret2 == 1, + "%s Repeated pattern of written and non-written pages max_pages\n", + __func__); + + /* 6. only get 2 dirty pages and clear them as well */ + vec_size = mem_size/page_size; + memset(mem, -1, mem_size); + + /* get and clear second and third pages */ + ret = pagemap_ioctl(mem + page_size, 2 * page_size, vec, 1, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ret2 = pagemap_ioctl(mem, mem_size, vec2, vec_size, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret2 < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret2, errno, strerror(errno)); + + ksft_test_result(ret == 1 && LEN(vec[0]) == 2 && + vec[0].start == (uintptr_t)(mem + page_size) && + ret2 == 2 && LEN(vec2[0]) == 1 && vec2[0].start == (uintptr_t)mem && + LEN(vec2[1]) == vec_size - 3 && + vec2[1].start == (uintptr_t)(mem + 3 * page_size), + "%s only get 2 written pages and clear them as well\n", __func__); + + wp_free(mem, mem_size); + munmap(mem, mem_size); + + /* 7. Two regions */ + m[0] = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (m[0] == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + m[1] = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (m[1] == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + + wp_init(m[0], mem_size); + wp_init(m[1], mem_size); + wp_addr_range(m[0], mem_size); + wp_addr_range(m[1], mem_size); + + memset(m[0], 'a', mem_size); + memset(m[1], 'b', mem_size); + + wp_addr_range(m[0], mem_size); + + ret = pagemap_ioctl(m[1], mem_size, vec, 1, 0, 0, PAGE_IS_WRITTEN, 0, 0, + PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 1 && LEN(vec[0]) == mem_size/page_size, + "%s Two regions\n", __func__); + + wp_free(m[0], mem_size); + wp_free(m[1], mem_size); + munmap(m[0], mem_size); + munmap(m[1], mem_size); + + free(vec); + free(vec2); + + /* 8. Smaller vec */ + mem_size = 1050 * page_size; + vec_size = mem_size/(page_size*2); + + vec = malloc(sizeof(struct page_region) * vec_size); + if (!vec) + ksft_exit_fail_msg("error nomem\n"); + + mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + for (i = 0; i < mem_size/page_size; i += 2) + mem[i * page_size]++; + + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + mem_size/(page_size*5), PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + total_pages += ret; + + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + mem_size/(page_size*5), PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + total_pages += ret; + + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + mem_size/(page_size*5), PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + total_pages += ret; + + ksft_test_result(total_pages == mem_size/(page_size*2), "%s Smaller max_pages\n", __func__); + + free(vec); + wp_free(mem, mem_size); + munmap(mem, mem_size); + total_pages = 0; + + /* 9. Smaller vec */ + mem_size = 10000 * page_size; + vec_size = 50; + + vec = malloc(sizeof(struct page_region) * vec_size); + if (!vec) + ksft_exit_fail_msg("error nomem\n"); + + mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + for (count = 0; count < TEST_ITERATIONS; count++) { + total_writes = total_reads = 0; + walk_end = (long)mem; + + for (i = 0; i < mem_size; i += page_size) { + if (rand() % 2) { + mem[i]++; + total_writes++; + } + } + + while (total_reads < total_writes) { + ret = pagemap_ioc((void *)walk_end, mem_size-(walk_end - (long)mem), vec, + vec_size, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + if (ret > vec_size) + break; + + reads = get_reads(vec, ret); + total_reads += reads; + } + + if (total_reads != total_writes) + break; + } + + ksft_test_result(count == TEST_ITERATIONS, "Smaller vec\n"); + + free(vec); + wp_free(mem, mem_size); + munmap(mem, mem_size); + + /* 10. Walk_end tester */ + vec_size = 1000; + mem_size = vec_size * page_size; + + vec = malloc(sizeof(struct page_region) * vec_size); + if (!vec) + ksft_exit_fail_msg("error nomem\n"); + + mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + memset(mem, 0, mem_size); + + ret = pagemap_ioc(mem, 0, vec, vec_size, 0, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 0 && walk_end == (long)mem, + "Walk_end: Same start and end address\n"); + + ret = pagemap_ioc(mem, 0, vec, vec_size, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 0 && walk_end == (long)mem, + "Walk_end: Same start and end with WP\n"); + + ret = pagemap_ioc(mem, 0, vec, 0, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 0 && walk_end == (long)mem, + "Walk_end: Same start and end with 0 output buffer\n"); + + ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 1 && walk_end == (long)(mem + mem_size), + "Walk_end: Big vec\n"); + + ret = pagemap_ioc(mem, mem_size, vec, 1, 0, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 1 && walk_end == (long)(mem + mem_size), + "Walk_end: vec of minimum length\n"); + + ret = pagemap_ioc(mem, mem_size, vec, 1, 0, + vec_size, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 1 && walk_end == (long)(mem + mem_size), + "Walk_end: Max pages specified\n"); + + ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0, + vec_size/2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 1 && walk_end == (long)(mem + mem_size/2), + "Walk_end: Half max pages\n"); + + ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0, + 1, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 1 && walk_end == (long)(mem + page_size), + "Walk_end: 1 max page\n"); + + ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0, + -1, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 1 && walk_end == (long)(mem + mem_size), + "Walk_end: max pages\n"); + + wp_addr_range(mem, mem_size); + for (i = 0; i < mem_size; i += 2 * page_size) + mem[i]++; + + ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == vec_size/2 && walk_end == (long)(mem + mem_size), + "Walk_end sparse: Big vec\n"); + + ret = pagemap_ioc(mem, mem_size, vec, 1, 0, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 1 && walk_end == (long)(mem + page_size * 2), + "Walk_end sparse: vec of minimum length\n"); + + ret = pagemap_ioc(mem, mem_size, vec, 1, 0, + vec_size, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 1 && walk_end == (long)(mem + page_size * 2), + "Walk_end sparse: Max pages specified\n"); + + ret = pagemap_ioc(mem, mem_size, vec, vec_size/2, 0, + vec_size, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == vec_size/2 && walk_end == (long)(mem + mem_size), + "Walk_end sparse: Max pages specified\n"); + + ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0, + vec_size, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == vec_size/2 && walk_end == (long)(mem + mem_size), + "Walk_end sparse: Max pages specified\n"); + + ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0, + vec_size/2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == vec_size/2 && walk_end == (long)(mem + mem_size), + "Walk_endsparse : Half max pages\n"); + + ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0, + 1, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + ksft_test_result(ret == 1 && walk_end == (long)(mem + page_size * 2), + "Walk_end: 1 max page\n"); + + free(vec); + wp_free(mem, mem_size); + munmap(mem, mem_size); + + return 0; +} + +int base_tests(char *prefix, char *mem, int mem_size, int skip) +{ + int vec_size, written; + struct page_region *vec, *vec2; + + if (skip) { + ksft_test_result_skip("%s all new pages must not be written (dirty)\n", prefix); + ksft_test_result_skip("%s all pages must be written (dirty)\n", prefix); + ksft_test_result_skip("%s all pages dirty other than first and the last one\n", + prefix); + ksft_test_result_skip("%s PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC\n", prefix); + ksft_test_result_skip("%s only middle page dirty\n", prefix); + ksft_test_result_skip("%s only two middle pages dirty\n", prefix); + return 0; + } + + vec_size = mem_size/page_size; + vec = malloc(sizeof(struct page_region) * vec_size); + vec2 = malloc(sizeof(struct page_region) * vec_size); + + /* 1. all new pages must be not be written (dirty) */ + written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + vec_size - 2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + ksft_test_result(written == 0, "%s all new pages must not be written (dirty)\n", prefix); + + /* 2. all pages must be written */ + memset(mem, -1, mem_size); + + written = pagemap_ioctl(mem, mem_size, vec, 1, 0, 0, PAGE_IS_WRITTEN, 0, 0, + PAGE_IS_WRITTEN); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + ksft_test_result(written == 1 && LEN(vec[0]) == mem_size/page_size, + "%s all pages must be written (dirty)\n", prefix); + + /* 3. all pages dirty other than first and the last one */ + written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + memset(mem + page_size, 0, mem_size - (2 * page_size)); + + written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + ksft_test_result(written == 1 && LEN(vec[0]) >= vec_size - 2 && LEN(vec[0]) <= vec_size, + "%s all pages dirty other than first and the last one\n", prefix); + + written = pagemap_ioctl(mem, mem_size, vec, 1, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + ksft_test_result(written == 0, + "%s PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC\n", prefix); + + /* 4. only middle page dirty */ + written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + mem[vec_size/2 * page_size]++; + + written = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, PAGE_IS_WRITTEN, + 0, 0, PAGE_IS_WRITTEN); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + ksft_test_result(written == 1 && LEN(vec[0]) >= 1, + "%s only middle page dirty\n", prefix); + + /* 5. only two middle pages dirty and walk over only middle pages */ + written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN | PAGE_IS_HUGE); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + mem[vec_size/2 * page_size]++; + mem[(vec_size/2 + 1) * page_size]++; + + written = pagemap_ioctl(&mem[vec_size/2 * page_size], 2 * page_size, vec, 1, 0, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN | PAGE_IS_HUGE); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + ksft_test_result(written == 1 && vec[0].start == (uintptr_t)(&mem[vec_size/2 * page_size]) + && LEN(vec[0]) == 2, + "%s only two middle pages dirty\n", prefix); + + free(vec); + free(vec2); + return 0; +} + +void *gethugepage(int map_size) +{ + int ret; + char *map; + + map = memalign(hpage_size, map_size); + if (!map) + ksft_exit_fail_msg("memalign failed %d %s\n", errno, strerror(errno)); + + ret = madvise(map, map_size, MADV_HUGEPAGE); + if (ret) + return NULL; + + memset(map, 0, map_size); + + return map; +} + +int hpage_unit_tests(void) +{ + char *map; + int ret, ret2; + size_t num_pages = 10; + int map_size = hpage_size * num_pages; + int vec_size = map_size/page_size; + struct page_region *vec, *vec2; + + vec = malloc(sizeof(struct page_region) * vec_size); + vec2 = malloc(sizeof(struct page_region) * vec_size); + if (!vec || !vec2) + ksft_exit_fail_msg("malloc failed\n"); + + map = gethugepage(map_size); + if (map) { + wp_init(map, map_size); + wp_addr_range(map, map_size); + + /* 1. all new huge page must not be written (dirty) */ + ret = pagemap_ioctl(map, map_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 0, "%s all new huge page must not be written (dirty)\n", + __func__); + + /* 2. all the huge page must not be written */ + ret = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 0, "%s all the huge page must not be written\n", __func__); + + /* 3. all the huge page must be written and clear dirty as well */ + memset(map, -1, map_size); + ret = pagemap_ioctl(map, map_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 1 && vec[0].start == (uintptr_t)map && + LEN(vec[0]) == vec_size && vec[0].categories == PAGE_IS_WRITTEN, + "%s all the huge page must be written and clear\n", __func__); + + /* 4. only middle page written */ + wp_free(map, map_size); + free(map); + map = gethugepage(map_size); + wp_init(map, map_size); + wp_addr_range(map, map_size); + map[vec_size/2 * page_size]++; + + ret = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 1 && LEN(vec[0]) > 0, + "%s only middle page written\n", __func__); + + wp_free(map, map_size); + free(map); + } else { + ksft_test_result_skip("%s all new huge page must be written\n", __func__); + ksft_test_result_skip("%s all the huge page must not be written\n", __func__); + ksft_test_result_skip("%s all the huge page must be written and clear\n", __func__); + ksft_test_result_skip("%s only middle page written\n", __func__); + } + + /* 5. clear first half of huge page */ + map = gethugepage(map_size); + if (map) { + wp_init(map, map_size); + wp_addr_range(map, map_size); + + memset(map, 0, map_size); + + wp_addr_range(map, map_size/2); + + ret = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 1 && LEN(vec[0]) == vec_size/2 && + vec[0].start == (uintptr_t)(map + map_size/2), + "%s clear first half of huge page\n", __func__); + wp_free(map, map_size); + free(map); + } else { + ksft_test_result_skip("%s clear first half of huge page\n", __func__); + } + + /* 6. clear first half of huge page with limited buffer */ + map = gethugepage(map_size); + if (map) { + wp_init(map, map_size); + wp_addr_range(map, map_size); + + memset(map, 0, map_size); + + ret = pagemap_ioctl(map, map_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + vec_size/2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ret = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 1 && LEN(vec[0]) == vec_size/2 && + vec[0].start == (uintptr_t)(map + map_size/2), + "%s clear first half of huge page with limited buffer\n", + __func__); + wp_free(map, map_size); + free(map); + } else { + ksft_test_result_skip("%s clear first half of huge page with limited buffer\n", + __func__); + } + + /* 7. clear second half of huge page */ + map = gethugepage(map_size); + if (map) { + wp_init(map, map_size); + wp_addr_range(map, map_size); + + memset(map, -1, map_size); + + ret = pagemap_ioctl(map + map_size/2, map_size/2, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, vec_size/2, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ret = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 1 && LEN(vec[0]) == vec_size/2, + "%s clear second half huge page\n", __func__); + wp_free(map, map_size); + free(map); + } else { + ksft_test_result_skip("%s clear second half huge page\n", __func__); + } + + /* 8. get half huge page */ + map = gethugepage(map_size); + if (map) { + wp_init(map, map_size); + wp_addr_range(map, map_size); + + memset(map, -1, map_size); + usleep(100); + + ret = pagemap_ioctl(map, map_size, vec, 1, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + hpage_size/(2*page_size), PAGE_IS_WRITTEN, 0, 0, + PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 1 && LEN(vec[0]) == hpage_size/(2*page_size), + "%s get half huge page\n", __func__); + + ret2 = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (ret2 < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret2, errno, strerror(errno)); + + ksft_test_result(ret2 == 1 && LEN(vec[0]) == (map_size - hpage_size/2)/page_size, + "%s get half huge page\n", __func__); + + wp_free(map, map_size); + free(map); + } else { + ksft_test_result_skip("%s get half huge page\n", __func__); + ksft_test_result_skip("%s get half huge page\n", __func__); + } + + free(vec); + free(vec2); + return 0; +} + +int unmapped_region_tests(void) +{ + void *start = (void *)0x10000000; + int written, len = 0x00040000; + int vec_size = len / page_size; + struct page_region *vec = malloc(sizeof(struct page_region) * vec_size); + + /* 1. Get written pages */ + written = pagemap_ioctl(start, len, vec, vec_size, 0, 0, + PAGEMAP_NON_WRITTEN_BITS, 0, 0, PAGEMAP_NON_WRITTEN_BITS); + if (written < 0) + ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno)); + + ksft_test_result(written >= 0, "%s Get status of pages\n", __func__); + + free(vec); + return 0; +} + +static void test_simple(void) +{ + int i; + char *map; + struct page_region vec; + + map = aligned_alloc(page_size, page_size); + if (!map) + ksft_exit_fail_msg("aligned_alloc failed\n"); + + wp_init(map, page_size); + wp_addr_range(map, page_size); + + for (i = 0 ; i < TEST_ITERATIONS; i++) { + if (pagemap_ioctl(map, page_size, &vec, 1, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) == 1) { + ksft_print_msg("written bit was 1, but should be 0 (i=%d)\n", i); + break; + } + + wp_addr_range(map, page_size); + /* Write something to the page to get the written bit enabled on the page */ + map[0]++; + + if (pagemap_ioctl(map, page_size, &vec, 1, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) == 0) { + ksft_print_msg("written bit was 0, but should be 1 (i=%d)\n", i); + break; + } + + wp_addr_range(map, page_size); + } + wp_free(map, page_size); + free(map); + + ksft_test_result(i == TEST_ITERATIONS, "Test %s\n", __func__); +} + +int sanity_tests(void) +{ + int mem_size, vec_size, ret, fd, i, buf_size; + struct page_region *vec; + char *mem, *fmem; + struct stat sbuf; + char *tmp_buf; + + /* 1. wrong operation */ + mem_size = 10 * page_size; + vec_size = mem_size / page_size; + + vec = malloc(sizeof(struct page_region) * vec_size); + mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED || vec == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, + 0, PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) >= 0, + "%s WP op can be specified with !PAGE_IS_WRITTEN\n", __func__); + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) >= 0, + "%s required_mask specified\n", __func__); + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + 0, PAGEMAP_BITS_ALL, 0, PAGEMAP_BITS_ALL) >= 0, + "%s anyof_mask specified\n", __func__); + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + 0, 0, PAGEMAP_BITS_ALL, PAGEMAP_BITS_ALL) >= 0, + "%s excluded_mask specified\n", __func__); + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + PAGEMAP_BITS_ALL, PAGEMAP_BITS_ALL, 0, + PAGEMAP_BITS_ALL) >= 0, + "%s required_mask and anyof_mask specified\n", __func__); + wp_free(mem, mem_size); + munmap(mem, mem_size); + + /* 2. Get sd and present pages with anyof_mask */ + mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + memset(mem, 0, mem_size); + + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + 0, PAGEMAP_BITS_ALL, 0, PAGEMAP_BITS_ALL); + ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)mem && LEN(vec[0]) == vec_size && + (vec[0].categories & (PAGE_IS_WRITTEN | PAGE_IS_PRESENT)) == + (PAGE_IS_WRITTEN | PAGE_IS_PRESENT), + "%s Get sd and present pages with anyof_mask\n", __func__); + + /* 3. Get sd and present pages with required_mask */ + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL); + ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)mem && LEN(vec[0]) == vec_size && + (vec[0].categories & (PAGE_IS_WRITTEN | PAGE_IS_PRESENT)) == + (PAGE_IS_WRITTEN | PAGE_IS_PRESENT), + "%s Get all the pages with required_mask\n", __func__); + + /* 4. Get sd and present pages with required_mask and anyof_mask */ + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + PAGE_IS_WRITTEN, PAGE_IS_PRESENT, 0, PAGEMAP_BITS_ALL); + ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)mem && LEN(vec[0]) == vec_size && + (vec[0].categories & (PAGE_IS_WRITTEN | PAGE_IS_PRESENT)) == + (PAGE_IS_WRITTEN | PAGE_IS_PRESENT), + "%s Get sd and present pages with required_mask and anyof_mask\n", + __func__); + + /* 5. Don't get sd pages */ + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + PAGE_IS_WRITTEN, 0, PAGE_IS_WRITTEN, PAGEMAP_BITS_ALL); + ksft_test_result(ret == 0, "%s Don't get sd pages\n", __func__); + + /* 6. Don't get present pages */ + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + PAGE_IS_PRESENT, 0, PAGE_IS_PRESENT, PAGEMAP_BITS_ALL); + ksft_test_result(ret == 0, "%s Don't get present pages\n", __func__); + + wp_free(mem, mem_size); + munmap(mem, mem_size); + + /* 8. Find written present pages with return mask */ + mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + memset(mem, 0, mem_size); + + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, + PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, 0, + 0, PAGEMAP_BITS_ALL, 0, PAGE_IS_WRITTEN); + ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)mem && LEN(vec[0]) == vec_size && + vec[0].categories == PAGE_IS_WRITTEN, + "%s Find written present pages with return mask\n", __func__); + wp_free(mem, mem_size); + munmap(mem, mem_size); + + /* 9. Memory mapped file */ + fd = open(__FILE__, O_RDONLY); + if (fd < 0) + ksft_exit_fail_msg("%s Memory mapped file\n"); + + ret = stat(__FILE__, &sbuf); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + fmem = mmap(NULL, sbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0); + if (fmem == MAP_FAILED) + ksft_exit_fail_msg("error nomem %ld %s\n", errno, strerror(errno)); + + tmp_buf = malloc(sbuf.st_size); + memcpy(tmp_buf, fmem, sbuf.st_size); + + ret = pagemap_ioctl(fmem, sbuf.st_size, vec, vec_size, 0, 0, + 0, PAGEMAP_NON_WRITTEN_BITS, 0, PAGEMAP_NON_WRITTEN_BITS); + + ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)fmem && + LEN(vec[0]) == ceilf((float)sbuf.st_size/page_size) && + (vec[0].categories & PAGE_IS_FILE), + "%s Memory mapped file\n", __func__); + + munmap(fmem, sbuf.st_size); + close(fd); + + /* 10. Create and read/write to a memory mapped file */ + buf_size = page_size * 10; + + fd = open(__FILE__".tmp2", O_RDWR | O_CREAT, 0666); + if (fd < 0) + ksft_exit_fail_msg("Read/write to memory: %s\n", + strerror(errno)); + + for (i = 0; i < buf_size; i++) + if (write(fd, "c", 1) < 0) + ksft_exit_fail_msg("Create and read/write to a memory mapped file\n"); + + fmem = mmap(NULL, buf_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); + if (fmem == MAP_FAILED) + ksft_exit_fail_msg("error nomem %ld %s\n", errno, strerror(errno)); + + wp_init(fmem, buf_size); + wp_addr_range(fmem, buf_size); + + for (i = 0; i < buf_size; i++) + fmem[i] = 'z'; + + msync(fmem, buf_size, MS_SYNC); + + ret = pagemap_ioctl(fmem, buf_size, vec, vec_size, 0, 0, + PAGE_IS_WRITTEN, PAGE_IS_PRESENT | PAGE_IS_SWAPPED | PAGE_IS_FILE, 0, + PAGEMAP_BITS_ALL); + + ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)fmem && + LEN(vec[0]) == (buf_size/page_size) && + (vec[0].categories & PAGE_IS_WRITTEN), + "%s Read/write to memory\n", __func__); + + wp_free(fmem, buf_size); + munmap(fmem, buf_size); + close(fd); + + free(vec); + return 0; +} + +int mprotect_tests(void) +{ + int ret; + char *mem, *mem2; + struct page_region vec; + int pagemap_fd = open("/proc/self/pagemap", O_RDONLY); + + if (pagemap_fd < 0) { + fprintf(stderr, "open() failed\n"); + exit(1); + } + + /* 1. Map two pages */ + mem = mmap(0, 2 * page_size, PROT_READ|PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + wp_init(mem, 2 * page_size); + wp_addr_range(mem, 2 * page_size); + + /* Populate both pages. */ + memset(mem, 1, 2 * page_size); + + ret = pagemap_ioctl(mem, 2 * page_size, &vec, 1, 0, 0, PAGE_IS_WRITTEN, + 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 1 && LEN(vec) == 2, "%s Both pages written\n", __func__); + + /* 2. Start tracking */ + wp_addr_range(mem, 2 * page_size); + + ksft_test_result(pagemap_ioctl(mem, 2 * page_size, &vec, 1, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) == 0, + "%s Both pages are not written (dirty)\n", __func__); + + /* 3. Remap the second page */ + mem2 = mmap(mem + page_size, page_size, PROT_READ|PROT_WRITE, + MAP_PRIVATE|MAP_ANON|MAP_FIXED, -1, 0); + if (mem2 == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + wp_init(mem2, page_size); + wp_addr_range(mem2, page_size); + + /* Protect + unprotect. */ + mprotect(mem, page_size, PROT_NONE); + mprotect(mem, 2 * page_size, PROT_READ); + mprotect(mem, 2 * page_size, PROT_READ|PROT_WRITE); + + /* Modify both pages. */ + memset(mem, 2, 2 * page_size); + + /* Protect + unprotect. */ + mprotect(mem, page_size, PROT_NONE); + mprotect(mem, page_size, PROT_READ); + mprotect(mem, page_size, PROT_READ|PROT_WRITE); + + ret = pagemap_ioctl(mem, 2 * page_size, &vec, 1, 0, 0, PAGE_IS_WRITTEN, + 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 1 && LEN(vec) == 2, + "%s Both pages written after remap and mprotect\n", __func__); + + /* 4. Clear and make the pages written */ + wp_addr_range(mem, 2 * page_size); + + memset(mem, 'A', 2 * page_size); + + ret = pagemap_ioctl(mem, 2 * page_size, &vec, 1, 0, 0, PAGE_IS_WRITTEN, + 0, 0, PAGE_IS_WRITTEN); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + ksft_test_result(ret == 1 && LEN(vec) == 2, + "%s Clear and make the pages written\n", __func__); + + wp_free(mem, 2 * page_size); + munmap(mem, 2 * page_size); + return 0; +} + +/* transact test */ +static const unsigned int nthreads = 6, pages_per_thread = 32, access_per_thread = 8; +static pthread_barrier_t start_barrier, end_barrier; +static unsigned int extra_thread_faults; +static unsigned int iter_count = 1000; +static volatile int finish; + +static ssize_t get_dirty_pages_reset(char *mem, unsigned int count, + int reset, int page_size) +{ + struct pm_scan_arg arg = {0}; + struct page_region rgns[256]; + int i, j, cnt, ret; + + arg.size = sizeof(struct pm_scan_arg); + arg.start = (uintptr_t)mem; + arg.max_pages = count; + arg.end = (uintptr_t)(mem + count * page_size); + arg.vec = (uintptr_t)rgns; + arg.vec_len = sizeof(rgns) / sizeof(*rgns); + if (reset) + arg.flags |= PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC; + arg.category_mask = PAGE_IS_WRITTEN; + arg.return_mask = PAGE_IS_WRITTEN; + + ret = ioctl(pagemap_fd, PAGEMAP_SCAN, &arg); + if (ret < 0) + ksft_exit_fail_msg("ioctl failed\n"); + + cnt = 0; + for (i = 0; i < ret; ++i) { + if (rgns[i].categories != PAGE_IS_WRITTEN) + ksft_exit_fail_msg("wrong flags\n"); + + for (j = 0; j < LEN(rgns[i]); ++j) + cnt++; + } + + return cnt; +} + +void *thread_proc(void *mem) +{ + int *m = mem; + long curr_faults, faults; + struct rusage r; + unsigned int i; + int ret; + + if (getrusage(RUSAGE_THREAD, &r)) + ksft_exit_fail_msg("getrusage\n"); + + curr_faults = r.ru_minflt; + + while (!finish) { + ret = pthread_barrier_wait(&start_barrier); + if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD) + ksft_exit_fail_msg("pthread_barrier_wait\n"); + + for (i = 0; i < access_per_thread; ++i) + __atomic_add_fetch(m + i * (0x1000 / sizeof(*m)), 1, __ATOMIC_SEQ_CST); + + ret = pthread_barrier_wait(&end_barrier); + if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD) + ksft_exit_fail_msg("pthread_barrier_wait\n"); + + if (getrusage(RUSAGE_THREAD, &r)) + ksft_exit_fail_msg("getrusage\n"); + + faults = r.ru_minflt - curr_faults; + if (faults < access_per_thread) + ksft_exit_fail_msg("faults < access_per_thread"); + + __atomic_add_fetch(&extra_thread_faults, faults - access_per_thread, + __ATOMIC_SEQ_CST); + curr_faults = r.ru_minflt; + } + + return NULL; +} + +static void transact_test(int page_size) +{ + unsigned int i, count, extra_pages; + pthread_t th; + char *mem; + int ret, c; + + if (pthread_barrier_init(&start_barrier, NULL, nthreads + 1)) + ksft_exit_fail_msg("pthread_barrier_init\n"); + + if (pthread_barrier_init(&end_barrier, NULL, nthreads + 1)) + ksft_exit_fail_msg("pthread_barrier_init\n"); + + mem = mmap(NULL, 0x1000 * nthreads * pages_per_thread, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("Error mmap %s.\n", strerror(errno)); + + wp_init(mem, 0x1000 * nthreads * pages_per_thread); + wp_addr_range(mem, 0x1000 * nthreads * pages_per_thread); + + memset(mem, 0, 0x1000 * nthreads * pages_per_thread); + + count = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1, page_size); + ksft_test_result(count > 0, "%s count %d\n", __func__, count); + count = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1, page_size); + ksft_test_result(count == 0, "%s count %d\n", __func__, count); + + finish = 0; + for (i = 0; i < nthreads; ++i) + pthread_create(&th, NULL, thread_proc, mem + 0x1000 * i * pages_per_thread); + + extra_pages = 0; + for (i = 0; i < iter_count; ++i) { + count = 0; + + ret = pthread_barrier_wait(&start_barrier); + if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD) + ksft_exit_fail_msg("pthread_barrier_wait\n"); + + count = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1, + page_size); + + ret = pthread_barrier_wait(&end_barrier); + if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD) + ksft_exit_fail_msg("pthread_barrier_wait\n"); + + if (count > nthreads * access_per_thread) + ksft_exit_fail_msg("Too big count %d expected %d, iter %d\n", + count, nthreads * access_per_thread, i); + + c = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1, page_size); + count += c; + + if (c > nthreads * access_per_thread) { + ksft_test_result_fail(" %s count > nthreads\n", __func__); + return; + } + + if (count != nthreads * access_per_thread) { + /* + * The purpose of the test is to make sure that no page updates are lost + * when the page updates and read-resetting soft dirty flags are performed + * in parallel. However, it is possible that the application will get the + * soft dirty flags twice on the two consecutive read-resets. This seems + * unavoidable as soft dirty flag is handled in software through page faults + * in kernel. While the updating the flags is supposed to be synchronized + * between page fault handling and read-reset, it is possible that + * read-reset happens after page fault PTE update but before the application + * re-executes write instruction. So read-reset gets the flag, clears write + * access and application gets page fault again for the same write. + */ + if (count < nthreads * access_per_thread) { + ksft_test_result_fail("Lost update, iter %d, %d vs %d.\n", i, count, + nthreads * access_per_thread); + return; + } + + extra_pages += count - nthreads * access_per_thread; + } + } + + pthread_barrier_wait(&start_barrier); + finish = 1; + pthread_barrier_wait(&end_barrier); + + ksft_test_result_pass("%s Extra pages %u (%.1lf%%), extra thread faults %d.\n", __func__, + extra_pages, + 100.0 * extra_pages / (iter_count * nthreads * access_per_thread), + extra_thread_faults); +} + +int main(void) +{ + int mem_size, shmid, buf_size, fd, i, ret; + char *mem, *map, *fmem; + struct stat sbuf; + + ksft_print_header(); + ksft_set_plan(115); + + page_size = getpagesize(); + hpage_size = read_pmd_pagesize(); + + pagemap_fd = open(PAGEMAP, O_RDONLY); + if (pagemap_fd < 0) + return -EINVAL; + + if (init_uffd()) + ksft_exit_fail_msg("uffd init failed\n"); + + /* 1. Sanity testing */ + sanity_tests_sd(); + + /* 2. Normal page testing */ + mem_size = 10 * page_size; + mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + base_tests("Page testing:", mem, mem_size, 0); + + wp_free(mem, mem_size); + munmap(mem, mem_size); + + /* 3. Large page testing */ + mem_size = 512 * 10 * page_size; + mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (mem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + base_tests("Large Page testing:", mem, mem_size, 0); + + wp_free(mem, mem_size); + munmap(mem, mem_size); + + /* 4. Huge page testing */ + map = gethugepage(hpage_size); + if (map) { + wp_init(map, hpage_size); + wp_addr_range(map, hpage_size); + base_tests("Huge page testing:", map, hpage_size, 0); + wp_free(map, hpage_size); + free(map); + } else { + base_tests("Huge page testing:", NULL, 0, 1); + } + + /* 5. SHM Hugetlb page testing */ + mem_size = 2*1024*1024; + mem = gethugetlb_mem(mem_size, &shmid); + if (mem) { + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + base_tests("Hugetlb shmem testing:", mem, mem_size, 0); + + wp_free(mem, mem_size); + shmctl(shmid, IPC_RMID, NULL); + } else { + base_tests("Hugetlb shmem testing:", NULL, 0, 1); + } + + /* 6. Hugetlb page testing */ + mem = gethugetlb_mem(mem_size, NULL); + if (mem) { + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + base_tests("Hugetlb mem testing:", mem, mem_size, 0); + + wp_free(mem, mem_size); + } else { + base_tests("Hugetlb mem testing:", NULL, 0, 1); + } + + /* 7. File Hugetlb testing */ + mem_size = 2*1024*1024; + fd = memfd_create("uffd-test", MFD_HUGETLB | MFD_NOEXEC_SEAL); + mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + if (mem) { + wp_init(mem, mem_size); + wp_addr_range(mem, mem_size); + + base_tests("Hugetlb shmem testing:", mem, mem_size, 0); + + wp_free(mem, mem_size); + shmctl(shmid, IPC_RMID, NULL); + } else { + base_tests("Hugetlb shmem testing:", NULL, 0, 1); + } + close(fd); + + /* 8. File memory testing */ + buf_size = page_size * 10; + + fd = open(__FILE__".tmp0", O_RDWR | O_CREAT, 0777); + if (fd < 0) + ksft_exit_fail_msg("Create and read/write to a memory mapped file: %s\n", + strerror(errno)); + + for (i = 0; i < buf_size; i++) + if (write(fd, "c", 1) < 0) + ksft_exit_fail_msg("Create and read/write to a memory mapped file\n"); + + ret = stat(__FILE__".tmp0", &sbuf); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + fmem = mmap(NULL, sbuf.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); + if (fmem == MAP_FAILED) + ksft_exit_fail_msg("error nomem %ld %s\n", errno, strerror(errno)); + + wp_init(fmem, sbuf.st_size); + wp_addr_range(fmem, sbuf.st_size); + + base_tests("File memory testing:", fmem, sbuf.st_size, 0); + + wp_free(fmem, sbuf.st_size); + munmap(fmem, sbuf.st_size); + close(fd); + + /* 9. File memory testing */ + buf_size = page_size * 10; + + fd = memfd_create(__FILE__".tmp00", MFD_NOEXEC_SEAL); + if (fd < 0) + ksft_exit_fail_msg("Create and read/write to a memory mapped file: %s\n", + strerror(errno)); + + if (ftruncate(fd, buf_size)) + ksft_exit_fail_msg("Error ftruncate\n"); + + for (i = 0; i < buf_size; i++) + if (write(fd, "c", 1) < 0) + ksft_exit_fail_msg("Create and read/write to a memory mapped file\n"); + + fmem = mmap(NULL, buf_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); + if (fmem == MAP_FAILED) + ksft_exit_fail_msg("error nomem %ld %s\n", errno, strerror(errno)); + + wp_init(fmem, buf_size); + wp_addr_range(fmem, buf_size); + + base_tests("File anonymous memory testing:", fmem, buf_size, 0); + + wp_free(fmem, buf_size); + munmap(fmem, buf_size); + close(fd); + + /* 10. Huge page tests */ + hpage_unit_tests(); + + /* 11. Iterative test */ + test_simple(); + + /* 12. Mprotect test */ + mprotect_tests(); + + /* 13. Transact test */ + transact_test(page_size); + + /* 14. Sanity testing */ + sanity_tests(); + + /*15. Unmapped address test */ + unmapped_region_tests(); + + /* 16. Userfaultfd tests */ + userfaultfd_tests(); + + close(pagemap_fd); + return ksft_exit_pass(); +} diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index 3e2bc818d566f..45941ad5f6589 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -56,6 +56,8 @@ separated by spaces: memory protection key tests - soft_dirty test soft dirty page bit semantics +- pagemap + test pagemap_scan IOCTL - cow test copy-on-write semantics - thp @@ -342,6 +344,8 @@ then CATEGORY="soft_dirty" run_test ./soft-dirty fi +CATEGORY="pagemap" run_test ./pagemap_ioctl + # COW tests CATEGORY="cow" run_test ./cow