1 // SPDX-License-Identifier: GPL-2.0-or-later
30 	self->page_size = (unsigned long)sysconf(_SC_PAGESIZE);  in FIXTURE_SETUP()
31 	self->pidfd = PIDFD_SELF;  in FIXTURE_SETUP()
32 	self->remote_pidfd = -1;  in FIXTURE_SETUP()
33 	self->child_pid = -1;  in FIXTURE_SETUP()
39 	if (self->child_pid > 0) {  in FIXTURE_TEARDOWN_PARENT()
40 		kill(self->child_pid, SIGKILL);  in FIXTURE_TEARDOWN_PARENT()
41 		waitpid(self->child_pid, NULL, 0);  in FIXTURE_TEARDOWN_PARENT()
44 	if (self->remote_pidfd >= 0)  in FIXTURE_TEARDOWN_PARENT()
45 		close(self->remote_pidfd);  in FIXTURE_TEARDOWN_PARENT()
55  * This test uses PIDFD_SELF to target the current process. The main
57  * a vector of non-contiguous memory ranges, not its cross-process
62 	const unsigned long pagesize = self->page_size;  in TEST_F()
65 	int pidfd = self->pidfd;  in TEST_F()
71 	 * mapping to advise on. This ensures we test non-contiguous iovecs.  in TEST_F()
74 		   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);  in TEST_F()
82 	 * Setup the iovec to point to 4 non-contiguous pages  in TEST_F()
95 	if (ret == -1 && errno == EPERM)  in TEST_F()
113 	/* Check that an un-advised page in between is still 'A'. */  in TEST_F()
124  * This test deterministically validates process_madvise() with MADV_COLLAPSE
127  * The test verifies that a memory region in a child process,
129  * The correctness of the MADV_COLLAPSE can be found in the relevant test examples in khugepaged.
133 	const unsigned long pagesize = self->page_size;  in TEST_F()
150 	self->child_pid = fork();  in TEST_F()
151 	ASSERT_NE(self->child_pid, -1);  in TEST_F()
153 	if (self->child_pid == 0) {  in TEST_F()
160 			   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);  in TEST_F()
183 		waitpid(self->child_pid, NULL, 0);  in TEST_F()
188 	self->child_pid = info.pid;  in TEST_F()
190 	self->remote_pidfd = syscall(__NR_pidfd_open, self->child_pid, 0);  in TEST_F()
191 	ASSERT_GE(self->remote_pidfd, 0);  in TEST_F()
196 	ret = sys_process_madvise(self->remote_pidfd, &vec, 1, MADV_COLLAPSE,  in TEST_F()
198 	if (ret == -1) {  in TEST_F()
211  * Test process_madvise() with a pidfd for a process that has already
216 	const unsigned long pagesize = self->page_size;  in TEST_F()
221 	map = mmap(NULL, pagesize, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1,  in TEST_F()
233 	self->child_pid = fork();  in TEST_F()
234 	ASSERT_NE(self->child_pid, -1);  in TEST_F()
236 	if (self->child_pid == 0)  in TEST_F()
239 	self->remote_pidfd = syscall(__NR_pidfd_open, self->child_pid, 0);  in TEST_F()
240 	ASSERT_GE(self->remote_pidfd, 0);  in TEST_F()
243 	waitpid(self->child_pid, NULL, 0);  in TEST_F()
245 	ret = sys_process_madvise(self->remote_pidfd, &vec, 1, MADV_DONTNEED,  in TEST_F()
247 	ASSERT_EQ(ret, -1);  in TEST_F()
252  * Test process_madvise() with bad pidfds to ensure correct error
257 	const unsigned long pagesize = self->page_size;  in TEST_F()
262 	map = mmap(NULL, pagesize, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1,  in TEST_F()
270 	/* Using an invalid fd number (-1) should fail with EBADF. */  in TEST_F()
271 	ret = sys_process_madvise(-1, &vec, 1, MADV_DONTNEED, 0);  in TEST_F()
272 	ASSERT_EQ(ret, -1);  in TEST_F()
280 	ASSERT_EQ(ret, -1);  in TEST_F()
285  * Test that process_madvise() rejects vlen > UIO_MAXIOV.
286  * The kernel should return -EINVAL when the number of iovecs exceeds 1024.
290 	const unsigned long pagesize = self->page_size;  in TEST_F()
291 	int pidfd = self->pidfd;  in TEST_F()
296 	map = mmap(NULL, pagesize, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1,  in TEST_F()
305 	ASSERT_EQ(ret, -1);  in TEST_F()
313  * Test process_madvise() with an invalid flag value. Currently, only a flag
314  * value of 0 is supported. This test is reserved for the future, e.g., if
319 	const unsigned long pagesize = self->page_size;  in TEST_F()
321 	int pidfd = self->pidfd;  in TEST_F()
326 	map = mmap(NULL, pagesize, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1,  in TEST_F()
337 	ASSERT_EQ(ret, -1);  in TEST_F()