200 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright Intel Corporation, 20234 *5 * Author: Chao Peng <chao.p.peng@linux.intel.com>6 */7#include <stdlib.h>8#include <string.h>9#include <unistd.h>10#include <errno.h>11#include <stdio.h>12#include <fcntl.h>13 14#include <linux/bitmap.h>15#include <linux/falloc.h>16#include <sys/mman.h>17#include <sys/types.h>18#include <sys/stat.h>19 20#include "kvm_util.h"21#include "test_util.h"22 23static void test_file_read_write(int fd)24{25 char buf[64];26 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");35}36 37static void test_mmap(int fd, size_t page_size)38{39 char *mem;40 41 mem = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);42 TEST_ASSERT_EQ(mem, MAP_FAILED);43}44 45static void test_file_size(int fd, size_t page_size, size_t total_size)46{47 struct stat sb;48 int ret;49 50 ret = fstat(fd, &sb);51 TEST_ASSERT(!ret, "fstat should succeed");52 TEST_ASSERT_EQ(sb.st_size, total_size);53 TEST_ASSERT_EQ(sb.st_blksize, page_size);54}55 56static void test_fallocate(int fd, size_t page_size, size_t total_size)57{58 int ret;59 60 ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, 0, total_size);61 TEST_ASSERT(!ret, "fallocate with aligned offset and size should succeed");62 63 ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,64 page_size - 1, page_size);65 TEST_ASSERT(ret, "fallocate with unaligned offset should fail");66 67 ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, total_size, page_size);68 TEST_ASSERT(ret, "fallocate beginning at total_size should fail");69 70 ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, total_size + page_size, page_size);71 TEST_ASSERT(ret, "fallocate beginning after total_size should fail");72 73 ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,74 total_size, page_size);75 TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) at total_size should succeed");76 77 ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,78 total_size + page_size, page_size);79 TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) after total_size should succeed");80 81 ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,82 page_size, page_size - 1);83 TEST_ASSERT(ret, "fallocate with unaligned size should fail");84 85 ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,86 page_size, page_size);87 TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) with aligned offset and size should succeed");88 89 ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, page_size, page_size);90 TEST_ASSERT(!ret, "fallocate to restore punched hole should succeed");91}92 93static void test_invalid_punch_hole(int fd, size_t page_size, size_t total_size)94{95 struct {96 off_t offset;97 off_t len;98 } testcases[] = {99 {0, 1},100 {0, page_size - 1},101 {0, page_size + 1},102 103 {1, 1},104 {1, page_size - 1},105 {1, page_size},106 {1, page_size + 1},107 108 {page_size, 1},109 {page_size, page_size - 1},110 {page_size, page_size + 1},111 };112 int ret, i;113 114 for (i = 0; i < ARRAY_SIZE(testcases); i++) {115 ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,116 testcases[i].offset, testcases[i].len);117 TEST_ASSERT(ret == -1 && errno == EINVAL,118 "PUNCH_HOLE with !PAGE_SIZE offset (%lx) and/or length (%lx) should fail",119 testcases[i].offset, testcases[i].len);120 }121}122 123static void test_create_guest_memfd_invalid(struct kvm_vm *vm)124{125 size_t page_size = getpagesize();126 uint64_t flag;127 size_t size;128 int fd;129 130 for (size = 1; size < page_size; size++) {131 fd = __vm_create_guest_memfd(vm, size, 0);132 TEST_ASSERT(fd == -1 && errno == EINVAL,133 "guest_memfd() with non-page-aligned page size '0x%lx' should fail with EINVAL",134 size);135 }136 137 for (flag = BIT(0); flag; flag <<= 1) {138 fd = __vm_create_guest_memfd(vm, page_size, flag);139 TEST_ASSERT(fd == -1 && errno == EINVAL,140 "guest_memfd() with flag '0x%lx' should fail with EINVAL",141 flag);142 }143}144 145static void test_create_guest_memfd_multiple(struct kvm_vm *vm)146{147 int fd1, fd2, ret;148 struct stat st1, st2;149 150 fd1 = __vm_create_guest_memfd(vm, 4096, 0);151 TEST_ASSERT(fd1 != -1, "memfd creation should succeed");152 153 ret = fstat(fd1, &st1);154 TEST_ASSERT(ret != -1, "memfd fstat should succeed");155 TEST_ASSERT(st1.st_size == 4096, "memfd st_size should match requested size");156 157 fd2 = __vm_create_guest_memfd(vm, 8192, 0);158 TEST_ASSERT(fd2 != -1, "memfd creation should succeed");159 160 ret = fstat(fd2, &st2);161 TEST_ASSERT(ret != -1, "memfd fstat should succeed");162 TEST_ASSERT(st2.st_size == 8192, "second memfd st_size should match requested size");163 164 ret = fstat(fd1, &st1);165 TEST_ASSERT(ret != -1, "memfd fstat should succeed");166 TEST_ASSERT(st1.st_size == 4096, "first memfd st_size should still match requested size");167 TEST_ASSERT(st1.st_ino != st2.st_ino, "different memfd should have different inode numbers");168 169 close(fd2);170 close(fd1);171}172 173int main(int argc, char *argv[])174{175 size_t page_size;176 size_t total_size;177 int fd;178 struct kvm_vm *vm;179 180 TEST_REQUIRE(kvm_has_cap(KVM_CAP_GUEST_MEMFD));181 182 page_size = getpagesize();183 total_size = page_size * 4;184 185 vm = vm_create_barebones();186 187 test_create_guest_memfd_invalid(vm);188 test_create_guest_memfd_multiple(vm);189 190 fd = vm_create_guest_memfd(vm, total_size, 0);191 192 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);197 198 close(fd);199}200