1 files changed, 0 insertions, 279 deletions
diff --git a/tools/testing/selftests/vm/ksm_functional_tests.c b/tools/testing/selftests/vm/ksm_functional_tests.c
deleted file mode 100644
index b11b7e5115dc..000000000000
--- a/tools/testing/selftests/vm/ksm_functional_tests.c
+++ /dev/null
@@ -1,279 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * KSM functional tests
- *
- * Copyright 2022, Red Hat, Inc.
- *
- * Author(s): David Hildenbrand <david@redhat.com>
- */
-#define _GNU_SOURCE
-#include <stdlib.h>
-#include <string.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <unistd.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <sys/syscall.h>
-#include <sys/ioctl.h>
-#include <linux/userfaultfd.h>
-
-#include "../kselftest.h"
-#include "vm_util.h"
-
-#define KiB 1024u
-#define MiB (1024 * KiB)
-
-static int ksm_fd;
-static int ksm_full_scans_fd;
-static int pagemap_fd;
-static size_t pagesize;
-
-static bool range_maps_duplicates(char *addr, unsigned long size)
-{
-	unsigned long offs_a, offs_b, pfn_a, pfn_b;
-
-	/*
-	 * There is no easy way to check if there are KSM pages mapped into
-	 * this range. We only check that the range does not map the same PFN
-	 * twice by comaring each pair of mapped pages.
-	 */
-	for (offs_a = 0; offs_a < size; offs_a += pagesize) {
-		pfn_a = pagemap_get_pfn(pagemap_fd, addr + offs_a);
-		/* Page not present or PFN not exposed by the kernel. */
-		if (pfn_a == -1ul || !pfn_a)
-			continue;
-
-		for (offs_b = offs_a + pagesize; offs_b < size;
-		     offs_b += pagesize) {
-			pfn_b = pagemap_get_pfn(pagemap_fd, addr + offs_b);
-			if (pfn_b == -1ul || !pfn_b)
-				continue;
-			if (pfn_a == pfn_b)
-				return true;
-		}
-	}
-	return false;
-}
-
-static long ksm_get_full_scans(void)
-{
-	char buf[10];
-	ssize_t ret;
-
-	ret = pread(ksm_full_scans_fd, buf, sizeof(buf) - 1, 0);
-	if (ret <= 0)
-		return -errno;
-	buf[ret] = 0;
-
-	return strtol(buf, NULL, 10);
-}
-
-static int ksm_merge(void)
-{
-	long start_scans, end_scans;
-
-	/* Wait for two full scans such that any possible merging happened. */
-	start_scans = ksm_get_full_scans();
-	if (start_scans < 0)
-		return start_scans;
-	if (write(ksm_fd, "1", 1) != 1)
-		return -errno;
-	do {
-		end_scans = ksm_get_full_scans();
-		if (end_scans < 0)
-			return end_scans;
-	} while (end_scans < start_scans + 2);
-
-	return 0;
-}
-
-static char *mmap_and_merge_range(char val, unsigned long size)
-{
-	char *map;
-
-	map = mmap(NULL, size, PROT_READ|PROT_WRITE,
-		   MAP_PRIVATE|MAP_ANON, -1, 0);
-	if (map == MAP_FAILED) {
-		ksft_test_result_fail("mmap() failed\n");
-		return MAP_FAILED;
-	}
-
-	/* Don't use THP. Ignore if THP are not around on a kernel. */
-	if (madvise(map, size, MADV_NOHUGEPAGE) && errno != EINVAL) {
-		ksft_test_result_fail("MADV_NOHUGEPAGE failed\n");
-		goto unmap;
-	}
-
-	/* Make sure each page contains the same values to merge them. */
-	memset(map, val, size);
-	if (madvise(map, size, MADV_MERGEABLE)) {
-		ksft_test_result_fail("MADV_MERGEABLE failed\n");
-		goto unmap;
-	}
-
-	/* Run KSM to trigger merging and wait. */
-	if (ksm_merge()) {
-		ksft_test_result_fail("Running KSM failed\n");
-		goto unmap;
-	}
-	return map;
-unmap:
-	munmap(map, size);
-	return MAP_FAILED;
-}
-
-static void test_unmerge(void)
-{
-	const unsigned int size = 2 * MiB;
-	char *map;
-
-	ksft_print_msg("[RUN] %s\n", __func__);
-
-	map = mmap_and_merge_range(0xcf, size);
-	if (map == MAP_FAILED)
-		return;
-
-	if (madvise(map, size, MADV_UNMERGEABLE)) {
-		ksft_test_result_fail("MADV_UNMERGEABLE failed\n");
-		goto unmap;
-	}
-
-	ksft_test_result(!range_maps_duplicates(map, size),
-			 "Pages were unmerged\n");
-unmap:
-	munmap(map, size);
-}
-
-static void test_unmerge_discarded(void)
-{
-	const unsigned int size = 2 * MiB;
-	char *map;
-
-	ksft_print_msg("[RUN] %s\n", __func__);
-
-	map = mmap_and_merge_range(0xcf, size);
-	if (map == MAP_FAILED)
-		return;
-
-	/* Discard half of all mapped pages so we have pte_none() entries. */
-	if (madvise(map, size / 2, MADV_DONTNEED)) {
-		ksft_test_result_fail("MADV_DONTNEED failed\n");
-		goto unmap;
-	}
-
-	if (madvise(map, size, MADV_UNMERGEABLE)) {
-		ksft_test_result_fail("MADV_UNMERGEABLE failed\n");
-		goto unmap;
-	}
-
-	ksft_test_result(!range_maps_duplicates(map, size),
-			 "Pages were unmerged\n");
-unmap:
-	munmap(map, size);
-}
-
-#ifdef __NR_userfaultfd
-static void test_unmerge_uffd_wp(void)
-{
-	struct uffdio_writeprotect uffd_writeprotect;
-	struct uffdio_register uffdio_register;
-	const unsigned int size = 2 * MiB;
-	struct uffdio_api uffdio_api;
-	char *map;
-	int uffd;
-
-	ksft_print_msg("[RUN] %s\n", __func__);
-
-	map = mmap_and_merge_range(0xcf, size);
-	if (map == MAP_FAILED)
-		return;
-
-	/* See if UFFD is around. */
-	uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
-	if (uffd < 0) {
-		ksft_test_result_skip("__NR_userfaultfd failed\n");
-		goto unmap;
-	}
-
-	/* See if UFFD-WP is around. */
-	uffdio_api.api = UFFD_API;
-	uffdio_api.features = UFFD_FEATURE_PAGEFAULT_FLAG_WP;
-	if (ioctl(uffd, UFFDIO_API, &uffdio_api) < 0) {
-		ksft_test_result_fail("UFFDIO_API failed\n");
-		goto close_uffd;
-	}
-	if (!(uffdio_api.features & UFFD_FEATURE_PAGEFAULT_FLAG_WP)) {
-		ksft_test_result_skip("UFFD_FEATURE_PAGEFAULT_FLAG_WP not available\n");
-		goto close_uffd;
-	}
-
-	/* Register UFFD-WP, no need for an actual handler. */
-	uffdio_register.range.start = (unsigned long) map;
-	uffdio_register.range.len = size;
-	uffdio_register.mode = UFFDIO_REGISTER_MODE_WP;
-	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register) < 0) {
-		ksft_test_result_fail("UFFDIO_REGISTER_MODE_WP failed\n");
-		goto close_uffd;
-	}
-
-	/* Write-protect the range using UFFD-WP. */
-	uffd_writeprotect.range.start = (unsigned long) map;
-	uffd_writeprotect.range.len = size;
-	uffd_writeprotect.mode = UFFDIO_WRITEPROTECT_MODE_WP;
-	if (ioctl(uffd, UFFDIO_WRITEPROTECT, &uffd_writeprotect)) {
-		ksft_test_result_fail("UFFDIO_WRITEPROTECT failed\n");
-		goto close_uffd;
-	}
-
-	if (madvise(map, size, MADV_UNMERGEABLE)) {
-		ksft_test_result_fail("MADV_UNMERGEABLE failed\n");
-		goto close_uffd;
-	}
-
-	ksft_test_result(!range_maps_duplicates(map, size),
-			 "Pages were unmerged\n");
-close_uffd:
-	close(uffd);
-unmap:
-	munmap(map, size);
-}
-#endif
-
-int main(int argc, char **argv)
-{
-	unsigned int tests = 2;
-	int err;
-
-#ifdef __NR_userfaultfd
-	tests++;
-#endif
-
-	ksft_print_header();
-	ksft_set_plan(tests);
-
-	pagesize = getpagesize();
-
-	ksm_fd = open("/sys/kernel/mm/ksm/run", O_RDWR);
-	if (ksm_fd < 0)
-		ksft_exit_skip("open(\"/sys/kernel/mm/ksm/run\") failed\n");
-	ksm_full_scans_fd = open("/sys/kernel/mm/ksm/full_scans", O_RDONLY);
-	if (ksm_full_scans_fd < 0)
-		ksft_exit_skip("open(\"/sys/kernel/mm/ksm/full_scans\") failed\n");
-	pagemap_fd = open("/proc/self/pagemap", O_RDONLY);
-	if (pagemap_fd < 0)
-		ksft_exit_skip("open(\"/proc/self/pagemap\") failed\n");
-
-	test_unmerge();
-	test_unmerge_discarded();
-#ifdef __NR_userfaultfd
-	test_unmerge_uffd_wp();
-#endif
-
-	err = ksft_get_fail_cnt();
-	if (err)
-		ksft_exit_fail_msg("%d out of %d tests failed\n",
-				   err, ksft_test_num());
-	return ksft_exit_pass();
-}