[PATCH v11 7/7] selftests: mm: add pagemap ioctl tests

Muhammad Usama Anjum
2023-03-09T14:01:51Z

Add pagemap ioctl tests. Add several different types of tests to judge
the correction of the interface.

Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
---
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
---
tools/testing/selftests/mm/.gitignore | 1 +
tools/testing/selftests/mm/Makefile | 4 +-
tools/testing/selftests/mm/config | 1 +
tools/testing/selftests/mm/pagemap_ioctl.c | 920 +++++++++++++++++++++
tools/testing/selftests/mm/run_vmtests.sh | 4 +
5 files changed, 929 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/mm/pagemap_ioctl.c
mode change 100644 => 100755 tools/testing/selftests/mm/run_vmtests.sh

diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore
index 1f8c36a9fa10..9e7e0ae26582 100644
--- a/tools/testing/selftests/mm/.gitignore
+++ b/tools/testing/selftests/mm/.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/mm/Makefile b/tools/testing/selftests/mm/Makefile
index fbf5646b1072..9fcba8e87f28 100644
--- a/tools/testing/selftests/mm/Makefile
+++ b/tools/testing/selftests/mm/Makefile
@@ -30,7 +30,7 @@ MACHINE ?= $(shell echo $(uname_M) | sed -e 's/aarch64.*/arm64/' -e 's/ppc64.*/p
MAKEFLAGS += --no-builtin-rules

CFLAGS = -Wall -I $(top_srcdir) -I $(top_srcdir)/tools/include/uapi $(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
@@ -56,6 +56,7 @@ 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
@@ -108,6 +109,7 @@ $(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/mm/config b/tools/testing/selftests/mm/config
index be087c4bc396..4309916f629e 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 000000000000..f0fc43694472
--- /dev/null
+++ b/tools/testing/selftests/mm/pagemap_ioctl.c
@@ -0,0 +1,920 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <malloc.h>
+#include "vm_util.h"
+#include "../kselftest.h"
+#include <linux/types.h>
+#include <linux/userfaultfd.h>
+#include <linux/fs.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <math.h>
+#include <asm/unistd.h>
+
+#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 pm_scan_arg arg;
+
+ arg.start = (uintptr_t)start;
+ arg.len = 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.required_mask = required_mask;
+ arg.anyof_mask = anyof_mask;
+ arg.excluded_mask = excluded_mask;
+ arg.return_mask = return_mask;
+
+ return ioctl(pagemap_fd, PAGEMAP_SCAN, &arg);
+}
+
+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_UNPOPULATED | UFFD_FEATURE_WP_ASYNC;
+ 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))
+ 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)\n");
+
+ 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)
+{
+ struct uffdio_writeprotect wp;
+
+ 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 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_OP_GET | PM_SCAN_OP_WP, 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 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,
+ PM_SCAN_OP_WP | PM_SCAN_OP_GET | 0x32,
+ 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) < 0,
+ "%s mixture of correct and wrong flag\n", __func__);
+
+ ksft_test_result(pagemap_ioctl(mem, mem_size, NULL, 0, PM_SCAN_OP_WP,
+ 0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) < 0,
+ "%s PM_SCAN_OP_WP cannot be used without get\n", __func__);
+
+ /* 2. Clear area with larger vec size */
+ ret = pagemap_ioctl(mem, mem_size, vec, vec_size, PM_SCAN_OP_GET | PM_SCAN_OP_WP, 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, PM_SCAN_OP_GET, 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, num_pages/5, PM_SCAN_OP_GET | PM_SCAN_OP_WP,
+ 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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\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);
+
+ wp_addr_range(m[0], mem_size);
+
+ ret = pagemap_ioctl(m[1], mem_size, vec, 1, PM_SCAN_OP_GET, 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, written, written2;
+ 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 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 written (dirty) */
+ written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_OP_GET | PM_SCAN_OP_WP, 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, PM_SCAN_OP_GET, 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 && vec[0].len == mem_size/page_size,
+ "%s all pages must be written (dirty)\n", prefix);
+
+ /* 3. all pages dirty other than first and the last one */
+ wp_addr_range(mem, mem_size);
+ memset(mem + page_size, 0, mem_size - (2 * page_size));
+
+ written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_OP_GET, 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 && 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 */
+ wp_addr_range(mem, mem_size);
+ mem[vec_size/2 * page_size]++;
+
+ written = pagemap_ioctl(mem, mem_size, vec, vec_size, PM_SCAN_OP_GET, 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 && vec[0].len >= 1,
+ "%s only middle page dirty\n", prefix);
+
+ /* 5. only two middle pages dirty and walk over only middle pages */
+ wp_addr_range(mem, mem_size);
+ 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, PM_SCAN_OP_GET,
+ 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 && 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, PM_SCAN_OP_GET | PM_SCAN_OP_WP,
+ 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));
+
+ written = pagemap_ioctl(mem, mem_size, vec2, vec_size, PM_SCAN_OP_GET, 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(ret == 1 && vec[0].len == 2 &&
+ vec[0].start == (uintptr_t)(mem + page_size) &&
+ written == 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 written pages and clear them as well\n", prefix);
+
+ /* 7. Range clear only */
+ memset(mem, -1, mem_size);
+
+ wp_addr_range(mem, mem_size);
+
+ written2 = pagemap_ioctl(mem, mem_size, vec, vec_size, PM_SCAN_OP_GET, 0,
+ PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+ if (written2 < 0)
+ ksft_exit_fail_msg("error %d %d %s\n", written2, errno, strerror(errno));
+
+ ksft_test_result(written2 == 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);
+
+ return map;
+}
+
+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 written (dirty) */
+ ret = pagemap_ioctl(map, map_size, vec, vec_size, PM_SCAN_OP_GET | PM_SCAN_OP_WP, 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, PM_SCAN_OP_GET, 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_OP_GET | PM_SCAN_OP_WP, 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 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, PM_SCAN_OP_GET, 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 written\n", __func__);
+
+ wp_free(map, map_size);
+ free(map);
+ } else {
+ ksft_test_result_skip("all new huge page must be written\n");
+ ksft_test_result_skip("all the huge page must not be written\n");
+ ksft_test_result_skip("all the huge page must be written and clear\n");
+ ksft_test_result_skip("only middle page written\n");
+ }
+
+ /* 5. clear first half of huge page */
+ map = gethugepage(map_size);
+ if (map) {
+
+ memset(map, 0, map_size);
+
+ wp_addr_range(map, map_size/2);
+
+ ret = pagemap_ioctl(map, map_size, vec, vec_size, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET | PM_SCAN_OP_WP,
+ 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, PM_SCAN_OP_GET, 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);
+
+ wp_addr_range(map + map_size/2, map_size/2);
+
+ ret = pagemap_ioctl(map, map_size, vec, vec_size, PM_SCAN_OP_GET, 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");
+ }
+
+ /* 8. get half huge page */
+ map = gethugepage(map_size);
+ if (map) {
+ memset(map, -1, map_size);
+
+ ret = pagemap_ioctl(map, map_size, vec, 1, PM_SCAN_OP_GET, 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 && vec[0].len == hpage_size/(2*page_size),
+ "%s get half huge page\n", __func__);
+ wp_free(map, map_size);
+ free(map);
+ } else {
+ ksft_test_result_skip("get half huge page\n");
+ }
+
+ 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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)
+{
+ 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,
+ PM_SCAN_OP_GET | PM_SCAN_OP_WP, 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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 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);
+
+ memset(mem, 0, mem_size);
+
+ ret = pagemap_ioctl(mem, mem_size, vec, vec_size, PM_SCAN_OP_GET, 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 written 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_PRIVATE, fd, 0);
+ if (fmem == MAP_FAILED)
+ ksft_exit_fail_msg("error nomem %ld %s\n", errno, strerror(errno));
+
+ ret = pagemap_ioctl(fmem, sbuf.st_size, vec, vec_size, PM_SCAN_OP_GET, 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, PM_SCAN_OP_GET, 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 written\n", __func__);
+
+ /* 2. Start tracking */
+ wp_addr_range(mem, 2 * page_size);
+
+ ksft_test_result(pagemap_ioctl(mem, 2 * page_size, &vec, 1, PM_SCAN_OP_GET, 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);
+
+ /* 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, PM_SCAN_OP_GET, 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 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, PM_SCAN_OP_GET, 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 written\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(57);
+
+ 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");
+
+ /*
+ * Written (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();
+
+ /* 3. 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
old mode 100644
new mode 100755
index 8984e0bb58c7..f7e1370cc581
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -50,6 +50,8 @@ 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
example: ./run_vmtests.sh -t "hmm mmap ksm"
@@ -268,6 +270,8 @@ fi

CATEGORY="soft_dirty" run_test ./soft-dirty

+CATEGORY="pagemap" run_test ./pagemap_ioctl
+
# COW tests
CATEGORY="cow" run_test ./cow

--
2.39.2