1 #include <stdio.h> 2 #include <string.h> 3 #include <signal.h> 4 #include <stdint.h> 5 #include <unistd.h> 6 #include <inttypes.h> 7 #include <stdlib.h> 8 #include <termios.h> 9 #include <sys/utsname.h> 10 #include <sys/types.h> 11 #include <sys/stat.h> 12 13 /* user defined header files */ 14 #include <linux/types.h> 15 #include <kvm/kvm.h> 16 #include <kvm/kvm-cpu.h> 17 #include <kvm/8250-serial.h> 18 #include <kvm/virtio-blk.h> 19 #include <kvm/virtio-console.h> 20 #include <kvm/disk-image.h> 21 #include <kvm/util.h> 22 #include <kvm/pci.h> 23 #include <kvm/term.h> 24 #include <kvm/ioport.h> 25 26 /* header files for gitish interface */ 27 #include <kvm/kvm-run.h> 28 #include <kvm/parse-options.h> 29 30 #define DEFAULT_KVM_DEV "/dev/kvm" 31 #define DEFAULT_CONSOLE "serial" 32 33 #define MB_SHIFT (20) 34 #define MIN_RAM_SIZE_MB (64ULL) 35 #define MIN_RAM_SIZE_BYTE (MIN_RAM_SIZE_MB << MB_SHIFT) 36 37 #define KVM_NR_CPUS (255) 38 39 static struct kvm *kvm; 40 static struct kvm_cpu *kvm_cpus[KVM_NR_CPUS]; 41 static __thread struct kvm_cpu *current_kvm_cpu; 42 43 static void handle_sigint(int sig) 44 { 45 exit(1); 46 } 47 48 static void handle_sigquit(int sig) 49 { 50 serial8250__inject_sysrq(kvm); 51 } 52 53 static void handle_sigalrm(int sig) 54 { 55 serial8250__inject_interrupt(kvm); 56 virtio_console__inject_interrupt(kvm); 57 } 58 59 static u64 ram_size = MIN_RAM_SIZE_MB; 60 static const char *kernel_cmdline; 61 static const char *kernel_filename; 62 static const char *initrd_filename; 63 static const char *image_filename; 64 static const char *console; 65 static const char *kvm_dev; 66 static bool single_step; 67 static bool readonly_image; 68 extern bool ioport_debug; 69 extern int active_console; 70 71 static int nrcpus = 1; 72 73 static const char * const run_usage[] = { 74 "kvm run [<options>] [<kernel image>]", 75 NULL 76 }; 77 78 static const struct option options[] = { 79 OPT_U64('m', "mem", &ram_size, "Virtual machine memory size in MiB."), 80 OPT_STRING('p', "params", &kernel_cmdline, "params", 81 "Kernel command line arguments"), 82 OPT_STRING('r', "initrd", &initrd_filename, "initrd", 83 "Initial RAM disk image"), 84 OPT_STRING('k', "kernel", &kernel_filename, "kernel", 85 "Kernel to boot in virtual machine"), 86 OPT_STRING('i', "image", &image_filename, "image", "Disk image"), 87 OPT_BOOLEAN('\0', "readonly", &readonly_image, 88 "Don't write changes back to disk image"), 89 OPT_STRING('d', "kvm-dev", &kvm_dev, "kvm-dev", "KVM device file"), 90 OPT_BOOLEAN('s', "single-step", &single_step, 91 "Enable single stepping"), 92 OPT_BOOLEAN('g', "ioport-debug", &ioport_debug, 93 "Enable ioport debugging"), 94 OPT_STRING('c', "console", &console, "serial or virtio", 95 "Console to use"), 96 OPT_INTEGER('\0', "cpus", &nrcpus, "Number of CPUs"), 97 OPT_END() 98 }; 99 100 static void *kvm_cpu_thread(void *arg) 101 { 102 current_kvm_cpu = arg; 103 104 if (kvm_cpu__start(current_kvm_cpu)) 105 goto panic_kvm; 106 107 kvm_cpu__delete(current_kvm_cpu); 108 109 return (void *) (intptr_t) 0; 110 111 panic_kvm: 112 fprintf(stderr, "KVM exit reason: %" PRIu32 " (\"%s\")\n", 113 current_kvm_cpu->kvm_run->exit_reason, 114 kvm_exit_reasons[current_kvm_cpu->kvm_run->exit_reason]); 115 if (current_kvm_cpu->kvm_run->exit_reason == KVM_EXIT_UNKNOWN) 116 fprintf(stderr, "KVM exit code: 0x%Lu\n", 117 current_kvm_cpu->kvm_run->hw.hardware_exit_reason); 118 disk_image__close(kvm->disk_image); 119 kvm_cpu__show_registers(current_kvm_cpu); 120 kvm_cpu__show_code(current_kvm_cpu); 121 kvm_cpu__show_page_tables(current_kvm_cpu); 122 123 kvm_cpu__delete(current_kvm_cpu); 124 125 return (void *) (intptr_t) 1; 126 } 127 128 static char host_kernel[PATH_MAX]; 129 130 static const char *find_host_kernel(void) 131 { 132 struct utsname uts; 133 struct stat st; 134 135 if (uname(&uts) < 0) 136 return NULL; 137 138 if (snprintf(host_kernel, PATH_MAX, "/boot/vmlinuz-%s", uts.release) < 0) 139 return NULL; 140 141 if (stat(host_kernel, &st) < 0) 142 return NULL; 143 144 if (!S_ISREG(st.st_mode)) 145 return NULL; 146 147 return host_kernel; 148 } 149 150 int kvm_cmd_run(int argc, const char **argv, const char *prefix) 151 { 152 static char real_cmdline[2048]; 153 int exit_code = 0; 154 int i; 155 156 signal(SIGALRM, handle_sigalrm); 157 signal(SIGQUIT, handle_sigquit); 158 signal(SIGINT, handle_sigint); 159 160 while (argc != 0) { 161 argc = parse_options(argc, argv, options, run_usage, 162 PARSE_OPT_STOP_AT_NON_OPTION); 163 if (argc != 0) { 164 if (kernel_filename) { 165 fprintf(stderr, "Cannot handle parameter: " 166 "%s\n", argv[0]); 167 usage_with_options(run_usage, options); 168 return EINVAL; 169 } 170 /* first unhandled parameter is treated as a kernel 171 image 172 */ 173 kernel_filename = argv[0]; 174 argv++; 175 argc--; 176 } 177 178 } 179 180 kernel_filename = find_host_kernel(); 181 182 if (!kernel_filename) { 183 usage_with_options(run_usage, options); 184 return EINVAL; 185 } 186 187 if (nrcpus < 1 || nrcpus > KVM_NR_CPUS) 188 die("Number of CPUs %d is out of [1;%d] range", nrcpus, KVM_NR_CPUS); 189 190 /* FIXME: Remove as only SMP gets fully supported */ 191 if (nrcpus > 1) 192 warning("Limiting CPUs to 1, true SMP is not yet implemented"); 193 194 if (ram_size < MIN_RAM_SIZE_MB) 195 die("Not enough memory specified: %lluMB (min %lluMB)", ram_size, MIN_RAM_SIZE_MB); 196 197 ram_size <<= MB_SHIFT; 198 199 if (!kvm_dev) 200 kvm_dev = DEFAULT_KVM_DEV; 201 202 if (!console) 203 console = DEFAULT_CONSOLE; 204 205 if (!strncmp(console, "virtio", 6)) 206 active_console = CONSOLE_VIRTIO; 207 else 208 active_console = CONSOLE_8250; 209 210 term_init(); 211 212 kvm = kvm__init(kvm_dev, ram_size); 213 214 if (image_filename) { 215 kvm->disk_image = disk_image__open(image_filename, readonly_image); 216 if (!kvm->disk_image) 217 die("unable to load disk image %s", image_filename); 218 } 219 220 strcpy(real_cmdline, "notsc nolapic noacpi pci=conf1 console=ttyS0 "); 221 if (!kernel_cmdline || !strstr(kernel_cmdline, "root=")) { 222 strlcat(real_cmdline, "root=/dev/vda rw ", 223 sizeof(real_cmdline)); 224 } 225 226 if (kernel_cmdline) { 227 strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline)); 228 real_cmdline[sizeof(real_cmdline)-1] = '\0'; 229 } 230 231 if (!kvm__load_kernel(kvm, kernel_filename, initrd_filename, 232 real_cmdline)) 233 die("unable to load kernel %s", kernel_filename); 234 235 ioport__setup_legacy(); 236 237 kvm__setup_bios(kvm); 238 239 serial8250__init(kvm); 240 241 pci__init(); 242 243 virtio_blk__init(kvm); 244 245 virtio_console__init(kvm); 246 247 kvm__start_timer(kvm); 248 249 for (i = 0; i < nrcpus; i++) { 250 kvm_cpus[i] = kvm_cpu__init(kvm, i); 251 if (!kvm_cpus[i]) 252 die("unable to initialize KVM VCPU"); 253 254 if (single_step) 255 kvm_cpu__enable_singlestep(kvm_cpus[i]); 256 257 if (pthread_create(&kvm_cpus[i]->thread, NULL, kvm_cpu_thread, kvm_cpus[i]) != 0) 258 die("unable to create KVM VCPU thread"); 259 } 260 261 for (i = 0; i < nrcpus; i++) { 262 void *ret; 263 264 if (pthread_join(kvm_cpus[i]->thread, &ret) != 0) 265 die("pthread_join"); 266 267 if (ret != NULL) 268 exit_code = 1; 269 } 270 271 disk_image__close(kvm->disk_image); 272 kvm__delete(kvm); 273 274 if (!exit_code) 275 printf("\n # KVM session ended normally.\n"); 276 277 return exit_code; 278 } 279