1 // SPDX-License-Identifier: GPL-2.0-only
3 * tools/testing/selftests/kvm/lib/test_util.c
5 * Copyright (C) 2020, Google LLC.
17 #include <sys/syscall.h>
18 #include <linux/mman.h>
19 #include "linux/kernel.h"
21 #include "test_util.h"
24 * Random number generator that is usable from guest code. This is the
25 * Park-Miller LCG using standard constants.
28 struct guest_random_state new_guest_random_state(uint32_t seed)
30 struct guest_random_state s = {.seed = seed};
34 uint32_t guest_random_u32(struct guest_random_state *state)
36 state->seed = (uint64_t)state->seed * 48271 % ((uint32_t)(1 << 31) - 1);
41 * Parses "[0-9]+[kmgt]?".
43 size_t parse_size(const char *size)
49 TEST_ASSERT(size && isdigit(size[0]), "Need at least one digit in '%s'", size);
51 base = strtoull(size, &scale, 0);
53 TEST_ASSERT(base != ULLONG_MAX, "Overflow parsing size!");
55 switch (tolower(*scale)) {
73 TEST_ASSERT(false, "Unknown size letter %c", *scale);
76 TEST_ASSERT((base << shift) >> shift == base, "Overflow scaling size!");
81 int64_t timespec_to_ns(struct timespec ts)
83 return (int64_t)ts.tv_nsec + 1000000000LL * (int64_t)ts.tv_sec;
86 struct timespec timespec_add_ns(struct timespec ts, int64_t ns)
90 res.tv_nsec = ts.tv_nsec + ns;
91 res.tv_sec = ts.tv_sec + res.tv_nsec / 1000000000LL;
92 res.tv_nsec %= 1000000000LL;
97 struct timespec timespec_add(struct timespec ts1, struct timespec ts2)
99 int64_t ns1 = timespec_to_ns(ts1);
100 int64_t ns2 = timespec_to_ns(ts2);
101 return timespec_add_ns((struct timespec){0}, ns1 + ns2);
104 struct timespec timespec_sub(struct timespec ts1, struct timespec ts2)
106 int64_t ns1 = timespec_to_ns(ts1);
107 int64_t ns2 = timespec_to_ns(ts2);
108 return timespec_add_ns((struct timespec){0}, ns1 - ns2);
111 struct timespec timespec_elapsed(struct timespec start)
115 clock_gettime(CLOCK_MONOTONIC, &end);
116 return timespec_sub(end, start);
119 struct timespec timespec_div(struct timespec ts, int divisor)
121 int64_t ns = timespec_to_ns(ts) / divisor;
123 return timespec_add_ns((struct timespec){0}, ns);
126 void print_skip(const char *fmt, ...)
134 puts(", skipping test");
137 bool thp_configured(void)
142 ret = stat("/sys/kernel/mm/transparent_hugepage", &statbuf);
143 TEST_ASSERT(ret == 0 || (ret == -1 && errno == ENOENT),
144 "Error in stating /sys/kernel/mm/transparent_hugepage");
149 size_t get_trans_hugepagesz(void)
155 TEST_ASSERT(thp_configured(), "THP is not configured in host kernel");
157 f = fopen("/sys/kernel/mm/transparent_hugepage/hpage_pmd_size", "r");
158 TEST_ASSERT(f != NULL, "Error in opening transparent_hugepage/hpage_pmd_size");
160 ret = fscanf(f, "%ld", &size);
161 ret = fscanf(f, "%ld", &size);
162 TEST_ASSERT(ret < 1, "Error reading transparent_hugepage/hpage_pmd_size");
168 size_t get_def_hugetlb_pagesz(void)
171 const char *hugepagesize = "Hugepagesize:";
172 const char *hugepages_total = "HugePages_Total:";
175 f = fopen("/proc/meminfo", "r");
176 TEST_ASSERT(f != NULL, "Error in opening /proc/meminfo");
178 while (fgets(buf, sizeof(buf), f) != NULL) {
179 if (strstr(buf, hugepages_total) == buf) {
180 unsigned long long total = strtoull(buf + strlen(hugepages_total), NULL, 10);
182 fprintf(stderr, "HUGETLB is not enabled in /proc/sys/vm/nr_hugepages\n");
186 if (strstr(buf, hugepagesize) == buf) {
188 return strtoull(buf + strlen(hugepagesize), NULL, 10) << 10;
193 fprintf(stderr, "HUGETLB is not configured in host kernel");
197 TEST_FAIL("Error in reading /proc/meminfo");
200 #define ANON_FLAGS (MAP_PRIVATE | MAP_ANONYMOUS)
201 #define ANON_HUGE_FLAGS (ANON_FLAGS | MAP_HUGETLB)
203 const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i)
205 static const struct vm_mem_backing_src_alias aliases[] = {
206 [VM_MEM_SRC_ANONYMOUS] = {
210 [VM_MEM_SRC_ANONYMOUS_THP] = {
211 .name = "anonymous_thp",
214 [VM_MEM_SRC_ANONYMOUS_HUGETLB] = {
215 .name = "anonymous_hugetlb",
216 .flag = ANON_HUGE_FLAGS,
218 [VM_MEM_SRC_ANONYMOUS_HUGETLB_16KB] = {
219 .name = "anonymous_hugetlb_16kb",
220 .flag = ANON_HUGE_FLAGS | MAP_HUGE_16KB,
222 [VM_MEM_SRC_ANONYMOUS_HUGETLB_64KB] = {
223 .name = "anonymous_hugetlb_64kb",
224 .flag = ANON_HUGE_FLAGS | MAP_HUGE_64KB,
226 [VM_MEM_SRC_ANONYMOUS_HUGETLB_512KB] = {
227 .name = "anonymous_hugetlb_512kb",
228 .flag = ANON_HUGE_FLAGS | MAP_HUGE_512KB,
230 [VM_MEM_SRC_ANONYMOUS_HUGETLB_1MB] = {
231 .name = "anonymous_hugetlb_1mb",
232 .flag = ANON_HUGE_FLAGS | MAP_HUGE_1MB,
234 [VM_MEM_SRC_ANONYMOUS_HUGETLB_2MB] = {
235 .name = "anonymous_hugetlb_2mb",
236 .flag = ANON_HUGE_FLAGS | MAP_HUGE_2MB,
238 [VM_MEM_SRC_ANONYMOUS_HUGETLB_8MB] = {
239 .name = "anonymous_hugetlb_8mb",
240 .flag = ANON_HUGE_FLAGS | MAP_HUGE_8MB,
242 [VM_MEM_SRC_ANONYMOUS_HUGETLB_16MB] = {
243 .name = "anonymous_hugetlb_16mb",
244 .flag = ANON_HUGE_FLAGS | MAP_HUGE_16MB,
246 [VM_MEM_SRC_ANONYMOUS_HUGETLB_32MB] = {
247 .name = "anonymous_hugetlb_32mb",
248 .flag = ANON_HUGE_FLAGS | MAP_HUGE_32MB,
250 [VM_MEM_SRC_ANONYMOUS_HUGETLB_256MB] = {
251 .name = "anonymous_hugetlb_256mb",
252 .flag = ANON_HUGE_FLAGS | MAP_HUGE_256MB,
254 [VM_MEM_SRC_ANONYMOUS_HUGETLB_512MB] = {
255 .name = "anonymous_hugetlb_512mb",
256 .flag = ANON_HUGE_FLAGS | MAP_HUGE_512MB,
258 [VM_MEM_SRC_ANONYMOUS_HUGETLB_1GB] = {
259 .name = "anonymous_hugetlb_1gb",
260 .flag = ANON_HUGE_FLAGS | MAP_HUGE_1GB,
262 [VM_MEM_SRC_ANONYMOUS_HUGETLB_2GB] = {
263 .name = "anonymous_hugetlb_2gb",
264 .flag = ANON_HUGE_FLAGS | MAP_HUGE_2GB,
266 [VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB] = {
267 .name = "anonymous_hugetlb_16gb",
268 .flag = ANON_HUGE_FLAGS | MAP_HUGE_16GB,
270 [VM_MEM_SRC_SHMEM] = {
274 [VM_MEM_SRC_SHARED_HUGETLB] = {
275 .name = "shared_hugetlb",
277 * No MAP_HUGETLB, we use MFD_HUGETLB instead. Since
278 * we're using "file backed" memory, we need to specify
279 * this when the FD is created, not when the area is
285 _Static_assert(ARRAY_SIZE(aliases) == NUM_SRC_TYPES,
286 "Missing new backing src types?");
288 TEST_ASSERT(i < NUM_SRC_TYPES, "Backing src type ID %d too big", i);
293 #define MAP_HUGE_PAGE_SIZE(x) (1ULL << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK))
295 size_t get_backing_src_pagesz(uint32_t i)
297 uint32_t flag = vm_mem_backing_src_alias(i)->flag;
300 case VM_MEM_SRC_ANONYMOUS:
301 case VM_MEM_SRC_SHMEM:
302 return getpagesize();
303 case VM_MEM_SRC_ANONYMOUS_THP:
304 return get_trans_hugepagesz();
305 case VM_MEM_SRC_ANONYMOUS_HUGETLB:
306 case VM_MEM_SRC_SHARED_HUGETLB:
307 return get_def_hugetlb_pagesz();
309 return MAP_HUGE_PAGE_SIZE(flag);
313 bool is_backing_src_hugetlb(uint32_t i)
315 return !!(vm_mem_backing_src_alias(i)->flag & MAP_HUGETLB);
318 static void print_available_backing_src_types(const char *prefix)
322 printf("%sAvailable backing src types:\n", prefix);
324 for (i = 0; i < NUM_SRC_TYPES; i++)
325 printf("%s %s\n", prefix, vm_mem_backing_src_alias(i)->name);
328 void backing_src_help(const char *flag)
330 printf(" %s: specify the type of memory that should be used to\n"
331 " back the guest data region. (default: %s)\n",
332 flag, vm_mem_backing_src_alias(DEFAULT_VM_MEM_SRC)->name);
333 print_available_backing_src_types(" ");
336 enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name)
340 for (i = 0; i < NUM_SRC_TYPES; i++)
341 if (!strcmp(type_name, vm_mem_backing_src_alias(i)->name))
344 print_available_backing_src_types("");
345 TEST_FAIL("Unknown backing src type: %s", type_name);
349 long get_run_delay(void)
355 sprintf(path, "/proc/%ld/schedstat", syscall(SYS_gettid));
356 fp = fopen(path, "r");
357 /* Return MIN_RUN_DELAY_NS upon failure just to be safe */
358 if (fscanf(fp, "%ld %ld ", &val[0], &val[1]) < 2)
359 val[1] = MIN_RUN_DELAY_NS;
365 int atoi_paranoid(const char *num_str)
371 num = strtol(num_str, &end_ptr, 0);
372 TEST_ASSERT(!errno, "strtol(\"%s\") failed", num_str);
373 TEST_ASSERT(num_str != end_ptr,
374 "strtol(\"%s\") didn't find a valid integer.", num_str);
375 TEST_ASSERT(*end_ptr == '\0',
376 "strtol(\"%s\") failed to parse trailing characters \"%s\".",
378 TEST_ASSERT(num >= INT_MIN && num <= INT_MAX,
379 "%ld not in range of [%d, %d]", num, INT_MIN, INT_MAX);
384 char *strdup_printf(const char *fmt, ...)
390 vasprintf(&str, fmt, ap);