From patchwork Thu Feb 2 11:29:15 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: 649876 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 4B479C636D3 for ; Thu, 2 Feb 2023 11:31:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232338AbjBBLbq (ORCPT ); Thu, 2 Feb 2023 06:31:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56140 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232182AbjBBLbM (ORCPT ); Thu, 2 Feb 2023 06:31:12 -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 DB0398C1FE; Thu, 2 Feb 2023 03:30:59 -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 2121E6602EEE; Thu, 2 Feb 2023 11:30:51 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1675337458; bh=68xZW31obFvoJ25sPIl+1L0Gtk11LF4zLf5XQTsrphs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LrVHKtNQT9NSHTN6O2JgQsB2wN9XmJ7pcKFaAHmLI4/kSTEwmEuirnrs72c+i0Vik NcvRYCuGEjVFiVyDUXfPPOeimZo36FDqFt2YysKm/Gt2Y61g1MvleTsq30KHbhTcMx DEcV63uackx5frv7N4nQ5ZobfcAODs5RCJkb536QCTF24SRGqfILoE+FTiXIicz0B5 gE1s75m6anZ4xW9/YR8dDGNMp7pgzGxh/Z5G0v26fKCmN0vA7pXyo+CVYyRxjPB9aJ 8NtI14aSJGcSb5MzHXsBuSTXHnCtUfJgL6tEqllGelIi94P9l4N8y3Wu592oTC+38F AywqGTycKxElQ== 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 6/6] selftests: vm: add pagemap ioctl tests Date: Thu, 2 Feb 2023 16:29:15 +0500 Message-Id: <20230202112915.867409-7-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 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 --- 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..54 ok 1 sanity_tests_sd wrong flag specified ok 2 sanity_tests_sd wrong mask specified ok 3 sanity_tests_sd wrong return mask specified ok 4 sanity_tests_sd mixture of correct and wrong flag ok 5 sanity_tests_sd Clear area with larger vec size ok 6 sanity_tests_sd Repeated pattern of dirty and non-dirty pages ok 7 sanity_tests_sd Repeated pattern of dirty and non-dirty pages in parts ok 8 sanity_tests_sd Two regions ok 9 Page testing: all new pages must be soft dirty ok 10 Page testing: all pages must not be soft dirty ok 11 Page testing: all pages dirty other than first and the last one ok 12 Page testing: only middle page dirty ok 13 Page testing: only two middle pages dirty ok 14 Page testing: only get 2 dirty pages and clear them as well ok 15 Page testing: Range clear only ok 16 Large Page testing: all new pages must be soft dirty ok 17 Large Page testing: all pages must not be soft dirty ok 18 Large Page testing: all pages dirty other than first and the last one ok 19 Large Page testing: only middle page dirty ok 20 Large Page testing: only two middle pages dirty ok 21 Large Page testing: only get 2 dirty pages and clear them as well ok 22 Large Page testing: Range clear only ok 23 Huge page testing: all new pages must be soft dirty ok 24 Huge page testing: all pages must not be soft dirty ok 25 Huge page testing: all pages dirty other than first and the last one ok 26 Huge page testing: only middle page dirty ok 27 Huge page testing: only two middle pages dirty ok 28 Huge page testing: only get 2 dirty pages and clear them as well ok 29 Huge page testing: Range clear only ok 30 hpage_unit_tests all new huge page must be dirty ok 31 hpage_unit_tests all the huge page must not be dirty ok 32 hpage_unit_tests all the huge page must be dirty and clear ok 33 hpage_unit_tests only middle page dirty ok 34 hpage_unit_tests clear first half of huge page ok 35 hpage_unit_tests clear first half of huge page with limited buffer ok 36 hpage_unit_tests clear second half huge page ok 37 Test test_simple ok 38 mprotect_tests Both pages dirty ok 39 mprotect_tests Both pages are not soft dirty ok 40 mprotect_tests Both pages dirty after remap and mprotect ok 41 mprotect_tests Clear and make the pages dirty ok 42 sanity_tests clear op can only be specified with PAGE_IS_WRITTEN ok 43 sanity_tests required_mask specified ok 44 sanity_tests anyof_mask specified ok 45 sanity_tests excluded_mask specified ok 46 sanity_tests required_mask and anyof_mask specified ok 47 sanity_tests Get sd and present pages with anyof_mask ok 48 sanity_tests Get all the pages with required_mask ok 49 sanity_tests Get sd and present pages with required_mask and anyof_mask ok 50 sanity_tests Don't get sd pages ok 51 sanity_tests Don't get present pages ok 52 sanity_tests Find dirty present pages with return mask ok 53 sanity_tests Memory mapped file ok 54 unmapped_region_tests Get status of pages # Totals: pass:54 fail:0 xfail:0 xpass:0 skip:0 error:0 --- tools/testing/selftests/vm/.gitignore | 1 + tools/testing/selftests/vm/Makefile | 5 +- tools/testing/selftests/vm/pagemap_ioctl.c | 881 +++++++++++++++++++++ 3 files changed, 885 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/vm/pagemap_ioctl.c diff --git a/tools/testing/selftests/vm/.gitignore b/tools/testing/selftests/vm/.gitignore index 1f8c36a9fa10..9e7e0ae26582 100644 --- a/tools/testing/selftests/vm/.gitignore +++ b/tools/testing/selftests/vm/.gitignore @@ -17,6 +17,7 @@ mremap_dontunmap mremap_test on-fault-limit transhuge-stress +pagemap_ioctl protection_keys protection_keys_32 protection_keys_64 diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile index 89c14e41bd43..54c074440a1b 100644 --- a/tools/testing/selftests/vm/Makefile +++ b/tools/testing/selftests/vm/Makefile @@ -24,9 +24,8 @@ MACHINE ?= $(shell echo $(uname_M) | sed -e 's/aarch64.*/arm64/' -e 's/ppc64.*/p # things despite using incorrect values such as an *occasionally* incomplete # LDLIBS. MAKEFLAGS += --no-builtin-rules - CFLAGS = -Wall -I $(top_srcdir) -I $(top_srcdir)/usr/include $(EXTRA_CFLAGS) $(KHDR_INCLUDES) -LDLIBS = -lrt -lpthread +LDLIBS = -lrt -lpthread -lm TEST_GEN_FILES = cow TEST_GEN_FILES += compaction_test TEST_GEN_FILES += gup_test @@ -52,6 +51,7 @@ TEST_GEN_FILES += on-fault-limit TEST_GEN_FILES += thuge-gen TEST_GEN_FILES += transhuge-stress TEST_GEN_FILES += userfaultfd +TEST_GEN_PROGS += pagemap_ioctl TEST_GEN_PROGS += soft-dirty TEST_GEN_PROGS += split_huge_page_test TEST_GEN_FILES += ksm_tests @@ -103,6 +103,7 @@ $(OUTPUT)/cow: vm_util.c $(OUTPUT)/khugepaged: vm_util.c $(OUTPUT)/ksm_functional_tests: vm_util.c $(OUTPUT)/madv_populate: vm_util.c +$(OUTPUT)/pagemap_ioctl: vm_util.c $(OUTPUT)/soft-dirty: vm_util.c $(OUTPUT)/split_huge_page_test: vm_util.c $(OUTPUT)/userfaultfd: vm_util.c diff --git a/tools/testing/selftests/vm/pagemap_ioctl.c b/tools/testing/selftests/vm/pagemap_ioctl.c new file mode 100644 index 000000000000..09b676a626d8 --- /dev/null +++ b/tools/testing/selftests/vm/pagemap_ioctl.c @@ -0,0 +1,881 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include "vm_util.h" +#include "../kselftest.h" +#include +#include +#include +#include +#include +#include +#include + +#define PAGEMAP_BITS_ALL (PAGE_IS_WRITTEN | PAGE_IS_FILE | \ + PAGE_IS_PRESENT | PAGE_IS_SWAPPED) +#define PAGEMAP_NON_WRITTEN_BITS (PAGE_IS_FILE | PAGE_IS_PRESENT | \ + PAGE_IS_SWAPPED) + +#define TEST_ITERATIONS 10 +#define PAGEMAP "/proc/self/pagemap" +int pagemap_fd; +int uffd; +int page_size; +int hpage_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 pagemap_scan_arg arg; + int ret; + + arg.start = (uintptr_t)start; + arg.len = len; + arg.vec = (uintptr_t)vec; + arg.vec_len = vec_len; + arg.flags = flag; + arg.max_pages = max_pages; + arg.required_mask = required_mask; + arg.anyof_mask = anyof_mask; + arg.excluded_mask = excluded_mask; + arg.return_mask = return_mask; + + ret = ioctl(pagemap_fd, PAGEMAP_SCAN, &arg); + + return ret; +} + +int init_uffd(void) +{ + struct uffdio_api uffdio_api; + + uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK); + if (uffd == -1) + ksft_exit_fail_msg("uffd syscall failed\n"); + + uffdio_api.api = UFFD_API; + uffdio_api.features = UFFD_FEATURE_WP_ASYNC; + if (ioctl(uffd, UFFDIO_API, &uffdio_api)) + ksft_exit_fail_msg("UFFDIO_API\n"); + + if (uffdio_api.api != UFFD_API) + 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; + + /* TODO: can it be avoided? Write protect doesn't engage on the pages if they aren't + * present already. The pages can be made present by writing to them. + */ + memset(lpBaseAddress, -1, dwRegionSize); + + 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) == -1) + ksft_exit_fail_msg("ioctl(UFFDIO_REGISTER)\n"); + + if (!(uffdio_register.ioctls & UFFDIO_WRITEPROTECT)) + ksft_exit_fail_msg("ioctl set is incorrect\n"); + + if (rand() % 2) { + wp.range.start = (unsigned long)lpBaseAddress; + wp.range.len = dwRegionSize; + wp.mode = UFFDIO_WRITEPROTECT_MODE_WP; + + if (ioctl(uffd, UFFDIO_WRITEPROTECT, &wp) == -1) + ksft_exit_fail_msg("ioctl(UFFDIO_WRITEPROTECT)\n"); + } else { + if (pagemap_ioctl(lpBaseAddress, dwRegionSize, NULL, 0, PAGEMAP_WP_ENGAGE, 0, + 0, 0, 0, 0) < 0) + ksft_exit_fail_msg("error %d %d %s\n", 1, errno, strerror(errno)); + } + 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 clear_softdirty_wp(void *lpBaseAddress, int dwRegionSize) +{ + struct uffdio_writeprotect wp; + + if (rand() % 2) { + wp.range.start = (unsigned long)lpBaseAddress; + wp.range.len = dwRegionSize; + wp.mode = UFFDIO_WRITEPROTECT_MODE_WP; + + if (ioctl(uffd, UFFDIO_WRITEPROTECT, &wp) == -1) + ksft_exit_fail_msg("ioctl(UFFDIO_WRITEPROTECT)\n"); + } else { + if (pagemap_ioctl(lpBaseAddress, dwRegionSize, NULL, 0, PAGEMAP_WP_ENGAGE, 0, + 0, 0, 0, 0) < 0) + ksft_exit_fail_msg("error %d %d %s\n", 1, errno, strerror(errno)); + } + return 0; +} + +int sanity_tests_sd(void) +{ + char *mem, *m[2]; + int mem_size, vec_size, ret, ret2, ret3, i, num_pages = 10; + struct page_region *vec; + + vec_size = 100; + mem_size = num_pages * 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); + + /* 1. wrong operation */ + 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, 8, + 0, 0x1111, 0, 0, PAGE_IS_WRITTEN) < 0, + "%s wrong mask 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, + PAGEMAP_WP_ENGAGE | 0x32, + 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) < 0, + "%s mixture of correct and wrong flag\n", __func__); + + /* 2. Clear area with larger vec size */ + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, PAGEMAP_WP_ENGAGE, 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 dirty and non-dirty 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 dirty and non-dirty pages\n", __func__); + + /* 4. Repeated pattern of dirty and non-dirty pages in parts */ + ret = pagemap_ioctl(mem, mem_size, vec, num_pages/5, PAGEMAP_WP_ENGAGE, + 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, num_pages/2, 0, 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 dirty and non-dirty pages in parts\n", __func__); + + wp_free(mem, mem_size); + munmap(mem, mem_size); + + /* 5. 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); + + memset(m[0], 'a', mem_size); + memset(m[1], 'b', mem_size); + + ret = pagemap_ioctl(m[0], mem_size, NULL, 0, PAGEMAP_WP_ENGAGE, 0, + 0, 0, 0, 0); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + 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 && vec[0].len == 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); + return 0; +} + +int base_tests(char *prefix, char *mem, int mem_size, int skip) +{ + int vec_size, ret, dirty, dirty2; + struct page_region *vec, *vec2; + + if (skip) { + ksft_test_result_skip("%s all new pages must be soft dirty\n", prefix); + ksft_test_result_skip("%s all pages must not be soft 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 only middle page dirty\n", prefix); + ksft_test_result_skip("%s only two middle pages dirty\n", prefix); + ksft_test_result_skip("%s only get 2 dirty pages and clear them as well\n", prefix); + ksft_test_result_skip("%s Range clear only\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 soft dirty */ + dirty = pagemap_ioctl(mem, mem_size, vec, 1, PAGEMAP_WP_ENGAGE, vec_size - 2, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (dirty < 0) + ksft_exit_fail_msg("error %d %d %s\n", dirty, errno, strerror(errno)); + + dirty2 = pagemap_ioctl(mem, mem_size, vec2, 1, PAGEMAP_WP_ENGAGE, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (dirty2 < 0) + ksft_exit_fail_msg("error %d %d %s\n", dirty2, errno, strerror(errno)); + + ksft_test_result(dirty == 0 && dirty2 == 0, + "%s all new pages must be soft dirty\n", prefix); + + /* 2. all pages must not be soft dirty */ + dirty = pagemap_ioctl(mem, mem_size, vec, 1, 0, 0, PAGE_IS_WRITTEN, 0, 0, + PAGE_IS_WRITTEN); + if (dirty < 0) + ksft_exit_fail_msg("error %d %d %s\n", dirty, errno, strerror(errno)); + + ksft_test_result(dirty == 0, "%s all pages must not be soft dirty\n", prefix); + + /* 3. all pages dirty other than first and the last one */ + memset(mem + page_size, 0, mem_size - (2 * page_size)); + + dirty = pagemap_ioctl(mem, mem_size, vec, 1, 0, 0, PAGE_IS_WRITTEN, 0, 0, + PAGE_IS_WRITTEN); + if (dirty < 0) + ksft_exit_fail_msg("error %d %d %s\n", dirty, errno, strerror(errno)); + + ksft_test_result(dirty == 1 && vec[0].len >= vec_size - 2 && vec[0].len <= vec_size, + "%s all pages dirty other than first and the last one\n", prefix); + + /* 4. only middle page dirty */ + clear_softdirty_wp(mem, mem_size); + mem[vec_size/2 * page_size]++; + + dirty = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, PAGE_IS_WRITTEN, 0, 0, + PAGE_IS_WRITTEN); + if (dirty < 0) + ksft_exit_fail_msg("error %d %d %s\n", dirty, errno, strerror(errno)); + + ksft_test_result(dirty == 1 && vec[0].len >= 1, + "%s only middle page dirty\n", prefix); + + /* 5. only two middle pages dirty and walk over only middle pages */ + clear_softdirty_wp(mem, mem_size); + mem[vec_size/2 * page_size]++; + mem[(vec_size/2 + 1) * page_size]++; + + dirty = pagemap_ioctl(&mem[vec_size/2 * page_size], 2 * page_size, vec, 1, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (dirty < 0) + ksft_exit_fail_msg("error %d %d %s\n", dirty, errno, strerror(errno)); + + ksft_test_result(dirty == 1 && vec[0].start == (uintptr_t)(&mem[vec_size/2 * page_size]) && + vec[0].len == 2, + "%s only two middle pages dirty\n", prefix); + + /* 6. only get 2 dirty pages and clear them as well */ + memset(mem, -1, mem_size); + + /* get and clear second and third pages */ + ret = pagemap_ioctl(mem + page_size, 2 * page_size, vec, 1, PAGEMAP_WP_ENGAGE, + 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)); + + dirty = pagemap_ioctl(mem, mem_size, vec2, vec_size, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (dirty < 0) + ksft_exit_fail_msg("error %d %d %s\n", dirty, errno, strerror(errno)); + + ksft_test_result(ret == 1 && vec[0].len == 2 && + vec[0].start == (uintptr_t)(mem + page_size) && + dirty == 2 && vec2[0].len == 1 && vec2[0].start == (uintptr_t)mem && + vec2[1].len == vec_size - 3 && + vec2[1].start == (uintptr_t)(mem + 3 * page_size), + "%s only get 2 dirty pages and clear them as well\n", prefix); + + /* 7. Range clear only */ + memset(mem, -1, mem_size); + + dirty = pagemap_ioctl(mem, mem_size, NULL, 0, PAGEMAP_WP_ENGAGE, 0, + 0, 0, 0, 0); + if (dirty < 0) + ksft_exit_fail_msg("error %d %d %s\n", dirty, errno, strerror(errno)); + + dirty2 = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); + if (dirty2 < 0) + ksft_exit_fail_msg("error %d %d %s\n", dirty2, errno, strerror(errno)); + + ksft_test_result(dirty == 0 && dirty2 == 0, "%s Range clear only\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) + ksft_exit_fail_msg("madvise failed %d %d %s\n", ret, errno, strerror(errno)); + + wp_init(map, map_size); + + if (check_huge_anon(map, map_size/hpage_size, hpage_size)) + return map; + + free(map); + return NULL; + +} + +int hpage_unit_tests(void) +{ + char *map; + int ret; + 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) { + /* 1. all new huge page must not be dirty */ + ret = pagemap_ioctl(map, map_size, vec, vec_size, PAGEMAP_WP_ENGAGE, 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 be dirty\n", __func__); + + /* 2. all the huge page must not be dirty */ + 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 dirty\n", __func__); + + /* 3. all the huge page must be dirty and clear dirty as well */ + memset(map, -1, map_size); + ret = pagemap_ioctl(map, map_size, vec, vec_size, PAGEMAP_WP_ENGAGE, 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 && + vec[0].len == vec_size && vec[0].bitmap == PAGE_IS_WRITTEN, + "%s all the huge page must be dirty and clear\n", __func__); + + /* 4. only middle page dirty */ + wp_free(map, map_size); + free(map); + map = gethugepage(map_size); + wp_init(map, map_size); + clear_softdirty_wp(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 && vec[0].len > 0, + "%s only middle page dirty\n", __func__); + + wp_free(map, map_size); + free(map); + } else { + ksft_test_result_skip("all new huge page must be dirty\n"); + ksft_test_result_skip("all the huge page must not be dirty\n"); + ksft_test_result_skip("all the huge page must be dirty and clear\n"); + ksft_test_result_skip("only middle page dirty\n"); + } + + /* 5. clear first half of huge page */ + map = gethugepage(map_size); + if (map) { + + memset(map, 0, map_size); + + ret = pagemap_ioctl(map, map_size/2, NULL, 0, PAGEMAP_WP_ENGAGE, 0, + 0, 0, 0, 0); + 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 && vec[0].len == 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("clear first half of huge page\n"); + } + + /* 6. clear first half of huge page with limited buffer */ + map = gethugepage(map_size); + if (map) { + memset(map, 0, map_size); + + ret = pagemap_ioctl(map, map_size, vec, vec_size, PAGEMAP_WP_ENGAGE, + 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 && vec[0].len == 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("clear first half of huge page with limited buffer\n"); + } + + /* 7. clear second half of huge page */ + map = gethugepage(map_size); + if (map) { + memset(map, -1, map_size); + ret = pagemap_ioctl(map + map_size/2, map_size/2, NULL, 0, PAGEMAP_WP_ENGAGE, + 0, 0, 0, 0, 0); + 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 && vec[0].len == vec_size/2, + "%s clear second half huge page\n", __func__); + wp_free(map, map_size); + free(map); + } else { + ksft_test_result_skip("clear second half huge page\n"); + } + + free(vec); + free(vec2); + return 0; +} + +int unmapped_region_tests(void) +{ + void *start = (void *)0x10000000; + int dirty, len = 0x00040000; + int vec_size = len / page_size; + struct page_region *vec = malloc(sizeof(struct page_region) * vec_size); + + /* 1. Get dirty pages */ + dirty = pagemap_ioctl(start, len, vec, vec_size, 0, 0, PAGEMAP_NON_WRITTEN_BITS, 0, 0, + PAGEMAP_NON_WRITTEN_BITS); + if (dirty < 0) + ksft_exit_fail_msg("error %d %d %s\n", dirty, errno, strerror(errno)); + + ksft_test_result(dirty >= 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); + + clear_softdirty_wp(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("dirty bit was 1, but should be 0 (i=%d)\n", i); + break; + } + + clear_softdirty_wp(map, page_size); + /* Write something to the page to get the dirty 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("dirty bit was 0, but should be 1 (i=%d)\n", i); + break; + } + + clear_softdirty_wp(map, page_size); + } + wp_free(map, page_size); + free(map); + + ksft_test_result(i == TEST_ITERATIONS, "Test %s\n", __func__); +} + +int sanity_tests(void) +{ + char *mem, *fmem; + int mem_size, vec_size, ret; + struct page_region *vec; + + /* 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); + + ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, PAGEMAP_WP_ENGAGE, 0, + PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) < 0, + "%s clear op can only 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); + + 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 && vec[0].len == vec_size && + vec[0].bitmap == (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 && vec[0].len == vec_size && + vec[0].bitmap == (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 && vec[0].len == vec_size && + vec[0].bitmap == (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, + 0, 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, + 0, 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 dirty 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); + + memset(mem, 0, mem_size); + + ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, + 0, PAGEMAP_BITS_ALL, 0, PAGE_IS_WRITTEN); + ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)mem && vec[0].len == vec_size && + vec[0].bitmap == PAGE_IS_WRITTEN, + "%s Find dirty present pages with return mask\n", __func__); + wp_free(mem, mem_size); + munmap(mem, mem_size); + + /* 9. Memory mapped file */ + int fd; + struct stat sbuf; + + fd = open(__FILE__, O_RDONLY); + if (fd < 0) { + ksft_test_result_skip("%s Memory mapped file\n"); + goto free_vec_and_return; + } + + 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_SHARED, fd, 0); + if (fmem == MAP_FAILED) + ksft_exit_fail_msg("error nomem\n"); + + 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 && + vec[0].len == ceilf((float)sbuf.st_size/page_size) && + vec[0].bitmap == PAGE_IS_FILE, + "%s Memory mapped file\n", __func__); + + munmap(fmem, sbuf.st_size); + close(fd); + +free_vec_and_return: + 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); + + /* 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 && vec.len == 2, "%s Both pages dirty\n", __func__); + + /* 2. Start softdirty tracking. Clear VM_SOFTDIRTY and clear the softdirty PTE bit. */ + ret = pagemap_ioctl(mem, 2 * page_size, NULL, 0, PAGEMAP_WP_ENGAGE, 0, + 0, 0, 0, 0); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + 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 soft 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); + + /* Protect + unprotect. */ + 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); + + 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 && vec.len == 2, + "%s Both pages dirty after remap and mprotect\n", __func__); + + /* 4. Clear and make the pages dirty */ + ret = pagemap_ioctl(mem, 2 * page_size, NULL, 0, PAGEMAP_WP_ENGAGE, 0, + 0, 0, 0, 0); + if (ret < 0) + ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno)); + + 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 && vec.len == 2, + "%s Clear and make the pages dirty\n", __func__); + + wp_free(mem, 2 * page_size); + munmap(mem, 2 * page_size); + return 0; +} + +int main(void) +{ + char *mem, *map; + int mem_size; + + ksft_print_header(); + ksft_set_plan(54); + + page_size = getpagesize(); + hpage_size = read_pmd_pagesize(); + + pagemap_fd = open(PAGEMAP, O_RDWR); + if (pagemap_fd < 0) + return -EINVAL; + + if (init_uffd()) + ksft_exit_fail_msg("uffd init failed\n"); + + /* + * Soft-dirty PTE bit tests + */ + + /* 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); + + 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); + + 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) { + 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); + } + + /* 6. Huge page tests */ + hpage_unit_tests(); + + /* 7. Iterative test */ + test_simple(); + + /* 8. Mprotect test */ + mprotect_tests(); + + /* + * Other PTE bit tests + */ + + /* 1. Sanity testing */ + sanity_tests(); + + /* 2. Unmapped address test */ + unmapped_region_tests(); + + close(pagemap_fd); + return ksft_exit_pass(); +}