selftests/kvm/guest_memfd_test.c

23 static void test_file_read_write(int fd)
27 	TEST_ASSERT(read(fd, buf, sizeof(buf)) < 0,
28 		    "read on a guest_mem fd should fail");
29 	TEST_ASSERT(write(fd, buf, sizeof(buf)) < 0,
30 		    "write on a guest_mem fd should fail");
31 	TEST_ASSERT(pread(fd, buf, sizeof(buf), 0) < 0,
32 		    "pread on a guest_mem fd should fail");
33 	TEST_ASSERT(pwrite(fd, buf, sizeof(buf), 0) < 0,
34 		    "pwrite on a guest_mem fd should fail");
37 static void test_mmap(int fd, size_t page_size)
41 	mem = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
45 static void test_file_size(int fd, size_t page_size, size_t total_size)
50 	ret = fstat(fd, &sb);
56 static void test_fallocate(int fd, size_t page_size, size_t total_size)
60 	ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, 0, total_size);
63 	ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
67 	ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, total_size, page_size);
70 	ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, total_size + page_size, page_size);
73 	ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
77 	ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
81 	ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
85 	ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
89 	ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, page_size, page_size);
93 static void test_invalid_punch_hole(int fd, size_t page_size, size_t total_size)
115 		ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
128 	int fd;
131 		fd = __vm_create_guest_memfd(vm, size, 0);
132 		TEST_ASSERT(fd == -1 && errno == EINVAL,
138 		fd = __vm_create_guest_memfd(vm, page_size, flag);
139 		TEST_ASSERT(fd == -1 && errno == EINVAL,
177 	int fd;
190 	fd = vm_create_guest_memfd(vm, total_size, 0);
192 	test_file_read_write(fd);
193 	test_mmap(fd, page_size);
194 	test_file_size(fd, page_size, total_size);
195 	test_fallocate(fd, page_size, total_size);
196 	test_invalid_punch_hole(fd, page_size, total_size);
198 	close(fd);