1 #include "kvm/builtin-run.h"
2
3 #include "kvm/builtin-setup.h"
4 #include "kvm/virtio-balloon.h"
5 #include "kvm/virtio-console.h"
6 #include "kvm/parse-options.h"
7 #include "kvm/8250-serial.h"
8 #include "kvm/framebuffer.h"
9 #include "kvm/disk-image.h"
10 #include "kvm/threadpool.h"
11 #include "kvm/virtio-scsi.h"
12 #include "kvm/virtio-blk.h"
13 #include "kvm/virtio-net.h"
14 #include "kvm/virtio-rng.h"
15 #include "kvm/ioeventfd.h"
16 #include "kvm/virtio-9p.h"
17 #include "kvm/barrier.h"
18 #include "kvm/kvm-cpu.h"
19 #include "kvm/ioport.h"
20 #include "kvm/symbol.h"
21 #include "kvm/i8042.h"
22 #include "kvm/mutex.h"
23 #include "kvm/term.h"
24 #include "kvm/util.h"
25 #include "kvm/strbuf.h"
26 #include "kvm/vesa.h"
27 #include "kvm/irq.h"
28 #include "kvm/kvm.h"
29 #include "kvm/pci.h"
30 #include "kvm/rtc.h"
31 #include "kvm/sdl.h"
32 #include "kvm/vnc.h"
33 #include "kvm/guest_compat.h"
34 #include "kvm/kvm-ipc.h"
35 #include "kvm/builtin-debug.h"
36
37 #include <linux/types.h>
38 #include <linux/err.h>
39 #include <linux/sizes.h>
40
41 #include <sys/utsname.h>
42 #include <sys/types.h>
43 #include <sys/stat.h>
44 #include <termios.h>
45 #include <signal.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <unistd.h>
49 #include <ctype.h>
50 #include <stdio.h>
51
52 #define KB_SHIFT (10)
53 #define MB_SHIFT (20)
54 #define GB_SHIFT (30)
55 #define TB_SHIFT (40)
56 #define PB_SHIFT (50)
57
58 __thread struct kvm_cpu *current_kvm_cpu;
59
60 static int kvm_run_wrapper;
61 int loglevel = LOGLEVEL_INFO;
62
63 static const char * const run_usage[] = {
64 "lkvm run [<options>] [<kernel image>]",
65 NULL
66 };
67
68 enum {
69 KVM_RUN_DEFAULT,
70 KVM_RUN_SANDBOX,
71 };
72
img_name_parser(const struct option * opt,const char * arg,int unset)73 static int img_name_parser(const struct option *opt, const char *arg, int unset)
74 {
75 char path[PATH_MAX];
76 struct stat st;
77
78 snprintf(path, PATH_MAX, "%s%s", kvm__get_dir(), arg);
79
80 if ((stat(arg, &st) == 0 && S_ISDIR(st.st_mode)) ||
81 (stat(path, &st) == 0 && S_ISDIR(st.st_mode)))
82 return virtio_9p_img_name_parser(opt, arg, unset);
83 return disk_img_name_parser(opt, arg, unset);
84 }
85
kvm_run_set_wrapper_sandbox(void)86 void kvm_run_set_wrapper_sandbox(void)
87 {
88 kvm_run_wrapper = KVM_RUN_SANDBOX;
89 }
90
parse_mem_unit(char ** next)91 static int parse_mem_unit(char **next)
92 {
93 switch (**next) {
94 case 'B': case 'b': (*next)++; return 0;
95 case 'K': case 'k': (*next)++; return KB_SHIFT;
96 case 'M': case 'm': (*next)++; return MB_SHIFT;
97 case 'G': case 'g': (*next)++; return GB_SHIFT;
98 case 'T': case 't': (*next)++; return TB_SHIFT;
99 case 'P': case 'p': (*next)++; return PB_SHIFT;
100 }
101
102 return MB_SHIFT;
103 }
104
parse_mem_option(const char * nptr,char ** next)105 static u64 parse_mem_option(const char *nptr, char **next)
106 {
107 u64 shift;
108 u64 val;
109
110 errno = 0;
111 val = strtoull(nptr, next, 10);
112 if (errno == ERANGE)
113 die("Memory too large: %s", nptr);
114 if (*next == nptr)
115 die("Invalid memory specifier: %s", nptr);
116
117 shift = parse_mem_unit(next);
118 if ((val << shift) < val)
119 die("Memory too large: %s", nptr);
120
121 return val << shift;
122 }
123
mem_parser(const struct option * opt,const char * arg,int unset)124 static int mem_parser(const struct option *opt, const char *arg, int unset)
125 {
126 struct kvm *kvm = opt->ptr;
127 char *next, *nptr;
128
129 kvm->cfg.ram_size = parse_mem_option(arg, &next);
130 if (kvm->cfg.ram_size == 0)
131 die("Invalid RAM size: %s", arg);
132
133 if (kvm__arch_has_cfg_ram_address() && *next == '@') {
134 next++;
135 if (*next == '\0')
136 die("Missing memory address: %s", arg);
137
138 nptr = next;
139 kvm->cfg.ram_addr = parse_mem_option(nptr, &next);
140 }
141
142 if (*next != '\0')
143 die("Invalid memory specifier: %s", arg);
144
145 return 0;
146 }
147
loglevel_parser(const struct option * opt,const char * arg,int unset)148 static int loglevel_parser(const struct option *opt, const char *arg, int unset)
149 {
150 if (strcmp(opt->long_name, "debug") == 0) {
151 loglevel = LOGLEVEL_DEBUG;
152 return 0;
153 }
154
155 if (strcmp(arg, "debug") == 0)
156 loglevel = LOGLEVEL_DEBUG;
157 else if (strcmp(arg, "info") == 0)
158 loglevel = LOGLEVEL_INFO;
159 else if (strcmp(arg, "warning") == 0)
160 loglevel = LOGLEVEL_WARNING;
161 else if (strcmp(arg, "error") == 0)
162 loglevel = LOGLEVEL_ERROR;
163 else
164 die("Unknown loglevel: %s", arg);
165
166 return 0;
167 }
168
169 #ifndef OPT_ARCH_RUN
170 #define OPT_ARCH_RUN(...)
171 #endif
172
173 #ifdef ARCH_HAS_CFG_RAM_ADDRESS
174 #define MEM_OPT_HELP_SHORT "size[BKMGTP][@addr[BKMGTP]]"
175 #define MEM_OPT_HELP_LONG \
176 "Virtual machine memory size and optional base address, both" \
177 " measured by default in megabytes (M)"
178 #else
179 #define MEM_OPT_HELP_SHORT "size[BKMGTP]"
180 #define MEM_OPT_HELP_LONG \
181 "Virtual machine memory size, by default measured in" \
182 " in megabytes (M)"
183 #endif
184
185 #if defined(CONFIG_ARM) || defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
186 #define VIRTIO_TRANS_OPT_HELP_SHORT "[pci|pci-legacy|mmio|mmio-legacy]"
187 #else
188 #define VIRTIO_TRANS_OPT_HELP_SHORT "[pci|pci-legacy]"
189 #endif
190
191 #define BUILD_OPTIONS(name, cfg, kvm) \
192 struct option name[] = { \
193 OPT_GROUP("Basic options:"), \
194 OPT_STRING('\0', "name", &(cfg)->guest_name, "guest name", \
195 "A name for the guest"), \
196 OPT_INTEGER('c', "cpus", &(cfg)->nrcpus, "Number of CPUs"), \
197 OPT_CALLBACK('m', "mem", NULL, MEM_OPT_HELP_SHORT, \
198 MEM_OPT_HELP_LONG, mem_parser, kvm), \
199 OPT_CALLBACK('d', "disk", kvm, "image or rootfs_dir", "Disk " \
200 " image or rootfs directory", img_name_parser, \
201 kvm), \
202 OPT_BOOLEAN('\0', "balloon", &(cfg)->balloon, "Enable virtio" \
203 " balloon"), \
204 OPT_BOOLEAN('\0', "vnc", &(cfg)->vnc, "Enable VNC framebuffer"),\
205 OPT_BOOLEAN('\0', "gtk", &(cfg)->gtk, "Enable GTK framebuffer"),\
206 OPT_BOOLEAN('\0', "sdl", &(cfg)->sdl, "Enable SDL framebuffer"),\
207 OPT_BOOLEAN('\0', "rng", &(cfg)->virtio_rng, "Enable virtio" \
208 " Random Number Generator"), \
209 OPT_BOOLEAN('\0', "nodefaults", &(cfg)->nodefaults, "Disable" \
210 " implicit configuration that cannot be" \
211 " disabled otherwise"), \
212 OPT_CALLBACK('\0', "9p", NULL, "dir_to_share,tag_name", \
213 "Enable virtio 9p to share files between host and" \
214 " guest", virtio_9p_rootdir_parser, kvm), \
215 OPT_STRING('\0', "console", &(cfg)->console, "serial, virtio or"\
216 " hv", "Console to use"), \
217 OPT_U64('\0', "vsock", &(cfg)->vsock_cid, \
218 "Guest virtio socket CID"), \
219 OPT_STRING('\0', "dev", &(cfg)->dev, "device_file", \
220 "KVM device file"), \
221 OPT_CALLBACK('\0', "tty", NULL, "tty id", \
222 "Remap guest TTY into a pty on the host", \
223 tty_parser, NULL), \
224 OPT_STRING('\0', "sandbox", &(cfg)->sandbox, "script", \
225 "Run this script when booting into custom" \
226 " rootfs"), \
227 OPT_STRING('\0', "hugetlbfs", &(cfg)->hugetlbfs_path, "path", \
228 "Hugetlbfs path"), \
229 OPT_CALLBACK_NOOPT('\0', "virtio-legacy", \
230 &(cfg)->virtio_transport, "", \
231 "Use legacy virtio transport (Deprecated:" \
232 " Use --virtio-transport option instead)", \
233 virtio_transport_parser, NULL), \
234 OPT_CALLBACK('\0', "virtio-transport", &(cfg)->virtio_transport,\
235 VIRTIO_TRANS_OPT_HELP_SHORT, \
236 "Type of virtio transport", \
237 virtio_transport_parser, NULL), \
238 OPT_CALLBACK('\0', "loglevel", NULL, "[error|warning|info|debug]",\
239 "Set the verbosity level", loglevel_parser, NULL),\
240 \
241 OPT_GROUP("Kernel options:"), \
242 OPT_STRING('k', "kernel", &(cfg)->kernel_filename, "kernel", \
243 "Kernel to boot in virtual machine"), \
244 OPT_STRING('i', "initrd", &(cfg)->initrd_filename, "initrd", \
245 "Initial RAM disk image"), \
246 OPT_STRING('p', "params", &(cfg)->kernel_cmdline, "params", \
247 "Kernel command line arguments"), \
248 OPT_STRING('f', "firmware", &(cfg)->firmware_filename, "firmware",\
249 "Firmware image to boot in virtual machine"), \
250 OPT_STRING('F', "flash", &(cfg)->flash_filename, "flash",\
251 "Flash image to present to virtual machine"), \
252 \
253 OPT_GROUP("Networking options:"), \
254 OPT_CALLBACK_DEFAULT('n', "network", NULL, "network params", \
255 "Create a new guest NIC. Pass mode=none to disable"\
256 " all network devices", \
257 netdev_parser, NULL, kvm), \
258 OPT_BOOLEAN('\0', "no-dhcp", &(cfg)->no_dhcp, "Disable kernel" \
259 " DHCP in rootfs mode"), \
260 \
261 OPT_GROUP("VFIO options:"), \
262 OPT_CALLBACK('\0', "vfio-pci", NULL, "[domain:]bus:dev.fn", \
263 "Assign a PCI device to the virtual machine", \
264 vfio_device_parser, kvm), \
265 \
266 OPT_GROUP("Debug options:"), \
267 OPT_CALLBACK_NOOPT('\0', "debug", kvm, NULL, \
268 "Enable debug messages (deprecated, use " \
269 "--loglevel=debug instead)", \
270 loglevel_parser, NULL), \
271 OPT_BOOLEAN('\0', "debug-single-step", &(cfg)->single_step, \
272 "Enable single stepping"), \
273 OPT_BOOLEAN('\0', "debug-ioport", &(cfg)->ioport_debug, \
274 "Enable ioport debugging"), \
275 OPT_BOOLEAN('\0', "debug-mmio", &(cfg)->mmio_debug, \
276 "Enable MMIO debugging"), \
277 OPT_INTEGER('\0', "debug-iodelay", &(cfg)->debug_iodelay, \
278 "Delay IO by millisecond"), \
279 \
280 OPT_ARCH(RUN, cfg) \
281 OPT_END() \
282 };
283
kvm_cpu_thread(void * arg)284 static void *kvm_cpu_thread(void *arg)
285 {
286 char name[16];
287
288 current_kvm_cpu = arg;
289
290 sprintf(name, "kvm-vcpu-%lu", current_kvm_cpu->cpu_id);
291 kvm__set_thread_name(name);
292
293 if (kvm_cpu__start(current_kvm_cpu))
294 goto panic_kvm;
295
296 return (void *) (intptr_t) 0;
297
298 panic_kvm:
299 pr_err("KVM exit reason: %u (\"%s\")",
300 current_kvm_cpu->kvm_run->exit_reason,
301 kvm_exit_reasons[current_kvm_cpu->kvm_run->exit_reason]);
302
303 if (current_kvm_cpu->kvm_run->exit_reason == KVM_EXIT_UNKNOWN) {
304 pr_err("KVM exit code: %llu",
305 (unsigned long long)current_kvm_cpu->kvm_run->hw.hardware_exit_reason);
306 }
307
308 kvm_cpu__set_debug_fd(STDOUT_FILENO);
309 kvm_cpu__show_registers(current_kvm_cpu);
310 kvm_cpu__show_code(current_kvm_cpu);
311 kvm_cpu__show_page_tables(current_kvm_cpu);
312
313 return (void *) (intptr_t) 1;
314 }
315
316 static char kernel[PATH_MAX];
317
318 static const char *host_kernels[] = {
319 "/boot/vmlinuz",
320 "/boot/bzImage",
321 NULL
322 };
323
324 static const char *default_kernels[] = {
325 "./bzImage",
326 "arch/" BUILD_ARCH "/boot/bzImage",
327 "../../arch/" BUILD_ARCH "/boot/bzImage",
328 NULL
329 };
330
331 static const char *default_vmlinux[] = {
332 "vmlinux",
333 "../../../vmlinux",
334 "../../vmlinux",
335 NULL
336 };
337
kernel_usage_with_options(void)338 static void kernel_usage_with_options(void)
339 {
340 const char **k;
341 struct utsname uts;
342
343 pr_err("Could not find default kernel image in:");
344 k = &default_kernels[0];
345 while (*k) {
346 pr_err("\t%s", *k);
347 k++;
348 }
349
350 if (uname(&uts) < 0)
351 return;
352
353 k = &host_kernels[0];
354 while (*k) {
355 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0)
356 return;
357 pr_err("\t%s", kernel);
358 k++;
359 }
360 pr_info("Please see '%s run --help' for more options.",
361 KVM_BINARY_NAME);
362 }
363
host_page_size(void)364 static long host_page_size(void)
365 {
366 long page_size = sysconf(_SC_PAGE_SIZE);
367
368 if (page_size < 0) {
369 pr_warning("sysconf(_SC_PAGE_SIZE) failed");
370 return 0;
371 }
372
373 return page_size;
374 }
375
host_ram_nrpages(void)376 static long host_ram_nrpages(void)
377 {
378 long nr_pages = sysconf(_SC_PHYS_PAGES);
379
380 if (nr_pages < 0) {
381 pr_warning("sysconf(_SC_PHYS_PAGES) failed");
382 return 0;
383 }
384
385 return nr_pages;
386 }
387
host_ram_size(void)388 static u64 host_ram_size(void)
389 {
390 long page_size = host_page_size();
391 long nr_pages = host_ram_nrpages();
392
393 return (u64)nr_pages * page_size;
394 }
395
396 /*
397 * If user didn't specify how much memory it wants to allocate for the guest,
398 * avoid filling the whole host RAM.
399 */
400 #define RAM_SIZE_RATIO 0.8
401
get_ram_size(int nr_cpus)402 static u64 get_ram_size(int nr_cpus)
403 {
404 long nr_pages_available = host_ram_nrpages() * RAM_SIZE_RATIO;
405 u64 ram_size = (u64)SZ_64M * (nr_cpus + 3);
406 u64 available = MIN_RAM_SIZE;
407
408 if (nr_pages_available)
409 available = nr_pages_available * host_page_size();
410
411 if (ram_size > available)
412 ram_size = available;
413
414 return ram_size;
415 }
416
find_kernel(void)417 static const char *find_kernel(void)
418 {
419 const char **k;
420 struct stat st;
421 struct utsname uts;
422
423 k = &default_kernels[0];
424 while (*k) {
425 if (stat(*k, &st) < 0 || !S_ISREG(st.st_mode)) {
426 k++;
427 continue;
428 }
429 strlcpy(kernel, *k, PATH_MAX);
430 return kernel;
431 }
432
433 if (uname(&uts) < 0)
434 return NULL;
435
436 k = &host_kernels[0];
437 while (*k) {
438 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0)
439 return NULL;
440
441 if (stat(kernel, &st) < 0 || !S_ISREG(st.st_mode)) {
442 k++;
443 continue;
444 }
445 return kernel;
446
447 }
448 return NULL;
449 }
450
find_vmlinux(void)451 static const char *find_vmlinux(void)
452 {
453 const char **vmlinux;
454
455 vmlinux = &default_vmlinux[0];
456 while (*vmlinux) {
457 struct stat st;
458
459 if (stat(*vmlinux, &st) < 0 || !S_ISREG(st.st_mode)) {
460 vmlinux++;
461 continue;
462 }
463 return *vmlinux;
464 }
465 return NULL;
466 }
467
kvm_run_help(void)468 void kvm_run_help(void)
469 {
470 struct kvm *kvm = NULL;
471
472 BUILD_OPTIONS(options, &kvm->cfg, kvm);
473 usage_with_options(run_usage, options);
474 }
475
kvm_run_set_sandbox(struct kvm * kvm)476 static int kvm_run_set_sandbox(struct kvm *kvm)
477 {
478 const char *guestfs_name = kvm->cfg.custom_rootfs_name;
479 char path[PATH_MAX], script[PATH_MAX], *tmp;
480
481 snprintf(path, PATH_MAX, "%s%s/virt/sandbox.sh", kvm__get_dir(), guestfs_name);
482
483 remove(path);
484
485 if (kvm->cfg.sandbox == NULL)
486 return 0;
487
488 tmp = realpath(kvm->cfg.sandbox, NULL);
489 if (tmp == NULL)
490 return -ENOMEM;
491
492 snprintf(script, PATH_MAX, "/host/%s", tmp);
493 free(tmp);
494
495 return symlink(script, path);
496 }
497
kvm_write_sandbox_cmd_exactly(int fd,const char * arg)498 static void kvm_write_sandbox_cmd_exactly(int fd, const char *arg)
499 {
500 const char *single_quote;
501
502 if (!*arg) { /* zero length string */
503 if (write(fd, "''", 2) <= 0)
504 die("Failed writing sandbox script");
505 return;
506 }
507
508 while (*arg) {
509 single_quote = strchrnul(arg, '\'');
510
511 /* write non-single-quote string as #('string') */
512 if (arg != single_quote) {
513 if (write(fd, "'", 1) <= 0 ||
514 write(fd, arg, single_quote - arg) <= 0 ||
515 write(fd, "'", 1) <= 0)
516 die("Failed writing sandbox script");
517 }
518
519 /* write single quote as #("'") */
520 if (*single_quote) {
521 if (write(fd, "\"'\"", 3) <= 0)
522 die("Failed writing sandbox script");
523 } else
524 break;
525
526 arg = single_quote + 1;
527 }
528 }
529
resolve_program(const char * src,char * dst,size_t len)530 static void resolve_program(const char *src, char *dst, size_t len)
531 {
532 struct stat st;
533 int err;
534
535 err = stat(src, &st);
536
537 if (!err && S_ISREG(st.st_mode)) {
538 char resolved_path[PATH_MAX];
539
540 if (!realpath(src, resolved_path))
541 die("Unable to resolve program %s: %s\n", src, strerror(errno));
542
543 if (snprintf(dst, len, "/host%s", resolved_path) >= (int)len)
544 die("Pathname too long: %s -> %s\n", src, resolved_path);
545
546 } else
547 strlcpy(dst, src, len);
548 }
549
kvm_run_write_sandbox_cmd(struct kvm * kvm,const char ** argv,int argc)550 static void kvm_run_write_sandbox_cmd(struct kvm *kvm, const char **argv, int argc)
551 {
552 const char script_hdr[] = "#! /bin/bash\n\n";
553 char program[PATH_MAX];
554 int fd;
555
556 remove(kvm->cfg.sandbox);
557
558 fd = open(kvm->cfg.sandbox, O_RDWR | O_CREAT, 0777);
559 if (fd < 0)
560 die("Failed creating sandbox script");
561
562 if (write(fd, script_hdr, sizeof(script_hdr) - 1) <= 0)
563 die("Failed writing sandbox script");
564
565 resolve_program(argv[0], program, PATH_MAX);
566 kvm_write_sandbox_cmd_exactly(fd, program);
567
568 argv++;
569 argc--;
570
571 while (argc) {
572 if (write(fd, " ", 1) <= 0)
573 die("Failed writing sandbox script");
574
575 kvm_write_sandbox_cmd_exactly(fd, argv[0]);
576 argv++;
577 argc--;
578 }
579 if (write(fd, "\n", 1) <= 0)
580 die("Failed writing sandbox script");
581
582 close(fd);
583 }
584
kvm_run_set_real_cmdline(struct kvm * kvm)585 static void kvm_run_set_real_cmdline(struct kvm *kvm)
586 {
587 static char real_cmdline[2048];
588 bool video;
589
590 video = kvm->cfg.vnc || kvm->cfg.sdl || kvm->cfg.gtk;
591
592 memset(real_cmdline, 0, sizeof(real_cmdline));
593 kvm__arch_set_cmdline(real_cmdline, video);
594
595 if (video) {
596 strcat(real_cmdline, " console=tty0");
597 } else {
598 switch (kvm->cfg.active_console) {
599 case CONSOLE_HV:
600 /* Fallthrough */
601 case CONSOLE_VIRTIO:
602 strcat(real_cmdline, " console=hvc0");
603 break;
604 case CONSOLE_8250:
605 strcat(real_cmdline, " console=ttyS0");
606 break;
607 }
608 }
609
610 if (kvm->cfg.using_rootfs) {
611 strcat(real_cmdline, " rw rootflags=trans=virtio,version=9p2000.L,cache=loose rootfstype=9p");
612 if (kvm->cfg.custom_rootfs) {
613 #ifdef CONFIG_GUEST_PRE_INIT
614 strcat(real_cmdline, " init=/virt/pre_init");
615 #else
616 strcat(real_cmdline, " init=/virt/init");
617 #endif
618 if (!kvm->cfg.no_dhcp)
619 strcat(real_cmdline, " ip=dhcp");
620 }
621 } else if (!kvm->cfg.kernel_cmdline || !strstr(kvm->cfg.kernel_cmdline, "root=")) {
622 strlcat(real_cmdline, " root=/dev/vda rw ", sizeof(real_cmdline));
623 }
624
625 if (kvm->cfg.kernel_cmdline) {
626 strcat(real_cmdline, " ");
627 strlcat(real_cmdline, kvm->cfg.kernel_cmdline, sizeof(real_cmdline));
628 }
629
630 kvm->cfg.real_cmdline = real_cmdline;
631 }
632
kvm_run_validate_cfg(struct kvm * kvm)633 static void kvm_run_validate_cfg(struct kvm *kvm)
634 {
635 u64 available_ram;
636
637 if (kvm->cfg.kernel_filename && kvm->cfg.firmware_filename)
638 die("Only one of --kernel or --firmware can be specified");
639
640 if ((kvm->cfg.vnc && (kvm->cfg.sdl || kvm->cfg.gtk)) ||
641 (kvm->cfg.sdl && kvm->cfg.gtk))
642 die("Only one of --vnc, --sdl or --gtk can be specified");
643
644 if (kvm->cfg.firmware_filename && kvm->cfg.initrd_filename)
645 pr_warning("Ignoring initrd file when loading a firmware image");
646
647 if (kvm->cfg.ram_size) {
648 available_ram = host_ram_size();
649 if (available_ram && kvm->cfg.ram_size > available_ram) {
650 pr_warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB",
651 (unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
652 (unsigned long long)available_ram >> MB_SHIFT);
653 }
654 }
655
656 kvm__arch_validate_cfg(kvm);
657 }
658
kvm_cmd_run_init(int argc,const char ** argv)659 static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
660 {
661 static char default_name[20];
662 unsigned int nr_online_cpus;
663 struct kvm *kvm = kvm__new();
664
665 if (IS_ERR(kvm))
666 return kvm;
667
668 nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
669 kvm->cfg.custom_rootfs_name = "default";
670 /*
671 * An architecture can allow the user to set the RAM base address to
672 * zero. Initialize the address before parsing the command line
673 * arguments, otherwise it will be impossible to distinguish between the
674 * user setting the base address to zero or letting it unset and using
675 * the default value.
676 */
677 kvm->cfg.ram_addr = kvm__arch_default_ram_address();
678
679 while (argc != 0) {
680 BUILD_OPTIONS(options, &kvm->cfg, kvm);
681 argc = parse_options(argc, argv, options, run_usage,
682 PARSE_OPT_STOP_AT_NON_OPTION |
683 PARSE_OPT_KEEP_DASHDASH);
684 if (argc != 0) {
685 /* Cusrom options, should have been handled elsewhere */
686 if (strcmp(argv[0], "--") == 0) {
687 if (kvm_run_wrapper == KVM_RUN_SANDBOX) {
688 kvm->cfg.sandbox = DEFAULT_SANDBOX_FILENAME;
689 kvm_run_write_sandbox_cmd(kvm, argv+1, argc-1);
690 break;
691 }
692 }
693
694 if ((kvm_run_wrapper == KVM_RUN_DEFAULT && kvm->cfg.kernel_filename) ||
695 (kvm_run_wrapper == KVM_RUN_SANDBOX && kvm->cfg.sandbox)) {
696 pr_err("Cannot handle parameter: %s", argv[0]);
697 usage_with_options(run_usage, options);
698 free(kvm);
699 return ERR_PTR(-EINVAL);
700 }
701 if (kvm_run_wrapper == KVM_RUN_SANDBOX) {
702 /*
703 * first unhandled parameter is treated as
704 * sandbox command
705 */
706 kvm->cfg.sandbox = DEFAULT_SANDBOX_FILENAME;
707 kvm_run_write_sandbox_cmd(kvm, argv, argc);
708 } else {
709 /*
710 * first unhandled parameter is treated as a kernel
711 * image
712 */
713 kvm->cfg.kernel_filename = argv[0];
714 }
715 argv++;
716 argc--;
717 }
718
719 }
720
721 kvm_run_validate_cfg(kvm);
722
723 if (!kvm->cfg.kernel_filename && !kvm->cfg.firmware_filename) {
724 kvm->cfg.kernel_filename = find_kernel();
725
726 if (!kvm->cfg.kernel_filename) {
727 kernel_usage_with_options();
728 return ERR_PTR(-EINVAL);
729 }
730 }
731
732 if (kvm->cfg.kernel_filename) {
733 kvm->cfg.vmlinux_filename = find_vmlinux();
734 kvm->vmlinux = kvm->cfg.vmlinux_filename;
735 }
736
737 if (kvm->cfg.nrcpus == 0)
738 kvm->cfg.nrcpus = nr_online_cpus;
739
740 if (!kvm->cfg.ram_size)
741 kvm->cfg.ram_size = get_ram_size(kvm->cfg.nrcpus);
742
743 if (!kvm->cfg.dev)
744 kvm->cfg.dev = DEFAULT_KVM_DEV;
745
746 if (!kvm->cfg.console)
747 kvm->cfg.console = DEFAULT_CONSOLE;
748
749 if (!strncmp(kvm->cfg.console, "virtio", 6))
750 kvm->cfg.active_console = CONSOLE_VIRTIO;
751 else if (!strncmp(kvm->cfg.console, "serial", 6))
752 kvm->cfg.active_console = CONSOLE_8250;
753 else if (!strncmp(kvm->cfg.console, "hv", 2))
754 kvm->cfg.active_console = CONSOLE_HV;
755 else
756 pr_warning("No console!");
757
758 if (!kvm->cfg.host_ip)
759 kvm->cfg.host_ip = DEFAULT_HOST_ADDR;
760
761 if (!kvm->cfg.guest_ip)
762 kvm->cfg.guest_ip = DEFAULT_GUEST_ADDR;
763
764 if (!kvm->cfg.guest_mac)
765 kvm->cfg.guest_mac = DEFAULT_GUEST_MAC;
766
767 if (!kvm->cfg.host_mac)
768 kvm->cfg.host_mac = DEFAULT_HOST_MAC;
769
770 if (!kvm->cfg.script)
771 kvm->cfg.script = DEFAULT_SCRIPT;
772
773 if (!kvm->cfg.network)
774 kvm->cfg.network = DEFAULT_NETWORK;
775
776 if (!kvm->cfg.guest_name) {
777 if (kvm->cfg.custom_rootfs) {
778 kvm->cfg.guest_name = kvm->cfg.custom_rootfs_name;
779 } else {
780 sprintf(default_name, "guest-%u", getpid());
781 kvm->cfg.guest_name = default_name;
782 }
783 }
784
785 if (!kvm->cfg.nodefaults &&
786 !kvm->cfg.using_rootfs &&
787 !kvm->cfg.disk_image[0].filename &&
788 !kvm->cfg.initrd_filename) {
789 char tmp[PATH_MAX];
790
791 kvm_setup_create_new(kvm->cfg.custom_rootfs_name);
792 kvm_setup_resolv(kvm->cfg.custom_rootfs_name);
793
794 snprintf(tmp, PATH_MAX, "%s%s", kvm__get_dir(), "default");
795 if (virtio_9p__register(kvm, tmp, "/dev/root") < 0)
796 die("Unable to initialize virtio 9p");
797 if (virtio_9p__register(kvm, "/", "hostfs") < 0)
798 die("Unable to initialize virtio 9p");
799 kvm->cfg.using_rootfs = kvm->cfg.custom_rootfs = 1;
800 }
801
802 if (kvm->cfg.custom_rootfs) {
803 kvm_run_set_sandbox(kvm);
804 if (kvm_setup_guest_init(kvm->cfg.custom_rootfs_name))
805 die("Failed to setup init for guest.");
806 }
807
808 if (kvm->cfg.nodefaults)
809 kvm->cfg.real_cmdline = kvm->cfg.kernel_cmdline;
810 else
811 kvm_run_set_real_cmdline(kvm);
812
813 if (kvm->cfg.kernel_filename) {
814 pr_info("# %s run -k %s -m %Lu -c %d --name %s", KVM_BINARY_NAME,
815 kvm->cfg.kernel_filename,
816 (unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
817 kvm->cfg.nrcpus, kvm->cfg.guest_name);
818 } else if (kvm->cfg.firmware_filename) {
819 pr_info("# %s run --firmware %s -m %Lu -c %d --name %s", KVM_BINARY_NAME,
820 kvm->cfg.firmware_filename,
821 (unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
822 kvm->cfg.nrcpus, kvm->cfg.guest_name);
823 }
824
825 if (init_list__init(kvm) < 0)
826 die ("Initialisation failed");
827
828 return kvm;
829 }
830
kvm_cmd_run_work(struct kvm * kvm)831 static int kvm_cmd_run_work(struct kvm *kvm)
832 {
833 int i;
834
835 for (i = 0; i < kvm->nrcpus; i++) {
836 if (pthread_create(&kvm->cpus[i]->thread, NULL, kvm_cpu_thread, kvm->cpus[i]) != 0)
837 die("unable to create KVM VCPU thread");
838 }
839
840 /* Only VCPU #0 is going to exit by itself when shutting down */
841 if (pthread_join(kvm->cpus[0]->thread, NULL) != 0)
842 die("unable to join with vcpu 0");
843
844 return kvm_cpu__exit(kvm);
845 }
846
kvm_cmd_run_exit(struct kvm * kvm,int guest_ret)847 static void kvm_cmd_run_exit(struct kvm *kvm, int guest_ret)
848 {
849 compat__print_all_messages();
850
851 init_list__exit(kvm);
852
853 if (guest_ret == 0)
854 pr_info("KVM session ended normally.");
855 }
856
kvm_cmd_run(int argc,const char ** argv,const char * prefix)857 int kvm_cmd_run(int argc, const char **argv, const char *prefix)
858 {
859 int ret = -EFAULT;
860 struct kvm *kvm;
861
862 kvm = kvm_cmd_run_init(argc, argv);
863 if (IS_ERR(kvm))
864 return PTR_ERR(kvm);
865
866 ret = kvm_cmd_run_work(kvm);
867 kvm_cmd_run_exit(kvm, ret);
868
869 return ret;
870 }
871