xref: /kvmtool/builtin-run.c (revision 4d67c820b22813caa819b607d35bc6dedef204c7)
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-net.h>
20 #include <kvm/virtio-console.h>
21 #include <kvm/disk-image.h>
22 #include <kvm/util.h>
23 #include <kvm/pci.h>
24 #include <kvm/term.h>
25 #include <kvm/ioport.h>
26 
27 /* header files for gitish interface  */
28 #include <kvm/kvm-run.h>
29 #include <kvm/parse-options.h>
30 
31 #define DEFAULT_KVM_DEV		"/dev/kvm"
32 #define DEFAULT_CONSOLE		"serial"
33 #define DEFAULT_NETWORK		"none"
34 #define DEFAULT_HOST_ADDR	"192.168.33.2"
35 
36 #define MB_SHIFT		(20)
37 #define MIN_RAM_SIZE_MB		(64ULL)
38 #define MIN_RAM_SIZE_BYTE	(MIN_RAM_SIZE_MB << MB_SHIFT)
39 
40 #define KVM_NR_CPUS		(255)
41 
42 static struct kvm *kvm;
43 static struct kvm_cpu *kvm_cpus[KVM_NR_CPUS];
44 static __thread struct kvm_cpu *current_kvm_cpu;
45 
46 static void handle_sigint(int sig)
47 {
48 	exit(1);
49 }
50 
51 static void handle_sigquit(int sig)
52 {
53 	serial8250__inject_sysrq(kvm);
54 }
55 
56 static void handle_sigalrm(int sig)
57 {
58 	serial8250__inject_interrupt(kvm);
59 	virtio_console__inject_interrupt(kvm);
60 }
61 
62 static u64 ram_size = MIN_RAM_SIZE_MB;
63 static const char *kernel_cmdline;
64 static const char *kernel_filename;
65 static const char *initrd_filename;
66 static const char *image_filename;
67 static const char *console;
68 static const char *kvm_dev;
69 static const char *network;
70 static const char *host_ip_addr;
71 static bool single_step;
72 static bool readonly_image;
73 extern bool ioport_debug;
74 extern int  active_console;
75 
76 static int nrcpus = 1;
77 
78 static const char * const run_usage[] = {
79 	"kvm run [<options>] [<kernel image>]",
80 	NULL
81 };
82 
83 static const struct option options[] = {
84 	OPT_GROUP("Basic options:"),
85 	OPT_INTEGER('\0', "cpus", &nrcpus, "Number of CPUs"),
86 	OPT_U64('m', "mem", &ram_size, "Virtual machine memory size in MiB."),
87 	OPT_STRING('i', "image", &image_filename, "image", "Disk image"),
88 	OPT_BOOLEAN('\0', "readonly", &readonly_image,
89 			"Don't write changes back to disk image"),
90 	OPT_STRING('c', "console", &console, "serial or virtio",
91 			"Console to use"),
92 
93 	OPT_GROUP("Kernel options:"),
94 	OPT_STRING('k', "kernel", &kernel_filename, "kernel",
95 			"Kernel to boot in virtual machine"),
96 	OPT_STRING('r', "initrd", &initrd_filename, "initrd",
97 			"Initial RAM disk image"),
98 	OPT_STRING('p', "params", &kernel_cmdline, "params",
99 			"Kernel command line arguments"),
100 
101 	OPT_GROUP("Networking options:"),
102 	OPT_STRING('n', "network", &network, "virtio",
103 			"Network to use"),
104 	OPT_STRING('\0', "host-ip-addr", &host_ip_addr, "a.b.c.d",
105 			"Assign this address to the host side networking"),
106 
107 	OPT_GROUP("Debug options:"),
108 	OPT_STRING('d', "kvm-dev", &kvm_dev, "kvm-dev", "KVM device file"),
109 	OPT_BOOLEAN('s', "single-step", &single_step,
110 			"Enable single stepping"),
111 	OPT_BOOLEAN('g', "ioport-debug", &ioport_debug,
112 			"Enable ioport debugging"),
113 	OPT_END()
114 };
115 
116 static void *kvm_cpu_thread(void *arg)
117 {
118 	current_kvm_cpu		= arg;
119 
120 	if (kvm_cpu__start(current_kvm_cpu))
121 		goto panic_kvm;
122 
123 	kvm_cpu__delete(current_kvm_cpu);
124 
125 	return (void *) (intptr_t) 0;
126 
127 panic_kvm:
128 	fprintf(stderr, "KVM exit reason: %" PRIu32 " (\"%s\")\n",
129 		current_kvm_cpu->kvm_run->exit_reason,
130 		kvm_exit_reasons[current_kvm_cpu->kvm_run->exit_reason]);
131 	if (current_kvm_cpu->kvm_run->exit_reason == KVM_EXIT_UNKNOWN)
132 		fprintf(stderr, "KVM exit code: 0x%Lu\n",
133 			current_kvm_cpu->kvm_run->hw.hardware_exit_reason);
134 	disk_image__close(kvm->disk_image);
135 	kvm_cpu__show_registers(current_kvm_cpu);
136 	kvm_cpu__show_code(current_kvm_cpu);
137 	kvm_cpu__show_page_tables(current_kvm_cpu);
138 
139 	kvm_cpu__delete(current_kvm_cpu);
140 
141 	return (void *) (intptr_t) 1;
142 }
143 
144 static char host_kernel[PATH_MAX];
145 
146 static const char *find_host_kernel(void)
147 {
148 	struct utsname uts;
149 	struct stat st;
150 
151 	if (uname(&uts) < 0)
152 		return NULL;
153 
154 	if (snprintf(host_kernel, PATH_MAX, "/boot/vmlinuz-%s", uts.release) < 0)
155 		return NULL;
156 
157 	if (stat(host_kernel, &st) < 0)
158 		return NULL;
159 
160 	if (!S_ISREG(st.st_mode))
161 		return NULL;
162 
163 	return host_kernel;
164 }
165 
166 int kvm_cmd_run(int argc, const char **argv, const char *prefix)
167 {
168 	static char real_cmdline[2048];
169 	int exit_code = 0;
170 	int i;
171 
172 	signal(SIGALRM, handle_sigalrm);
173 	signal(SIGQUIT, handle_sigquit);
174 	signal(SIGINT, handle_sigint);
175 
176 	while (argc != 0) {
177 		argc = parse_options(argc, argv, options, run_usage,
178 				PARSE_OPT_STOP_AT_NON_OPTION);
179 		if (argc != 0) {
180 			if (kernel_filename) {
181 				fprintf(stderr, "Cannot handle parameter: "
182 						"%s\n", argv[0]);
183 				usage_with_options(run_usage, options);
184 				return EINVAL;
185 			}
186 			/* first unhandled parameter is treated as a kernel
187 			   image
188 			 */
189 			kernel_filename = argv[0];
190 			argv++;
191 			argc--;
192 		}
193 
194 	}
195 
196 	if (!kernel_filename)
197 		kernel_filename = find_host_kernel();
198 
199 	if (!kernel_filename) {
200 		usage_with_options(run_usage, options);
201 		return EINVAL;
202 	}
203 
204 	if (nrcpus < 1 || nrcpus > KVM_NR_CPUS)
205 		die("Number of CPUs %d is out of [1;%d] range", nrcpus, KVM_NR_CPUS);
206 
207 	/* FIXME: Remove as only SMP gets fully supported */
208 	if (nrcpus > 1)
209 		warning("Limiting CPUs to 1, true SMP is not yet implemented");
210 
211 	if (ram_size < MIN_RAM_SIZE_MB)
212 		die("Not enough memory specified: %lluMB (min %lluMB)", ram_size, MIN_RAM_SIZE_MB);
213 
214 	ram_size <<= MB_SHIFT;
215 
216 	if (!kvm_dev)
217 		kvm_dev = DEFAULT_KVM_DEV;
218 
219 	if (!console)
220 		console = DEFAULT_CONSOLE;
221 
222 	if (!strncmp(console, "virtio", 6))
223 		active_console  = CONSOLE_VIRTIO;
224 	else
225 		active_console  = CONSOLE_8250;
226 
227 	if (!host_ip_addr)
228 		host_ip_addr = DEFAULT_HOST_ADDR;
229 
230 	term_init();
231 
232 	kvm = kvm__init(kvm_dev, ram_size);
233 
234 	if (image_filename) {
235 		kvm->disk_image	= disk_image__open(image_filename, readonly_image);
236 		if (!kvm->disk_image)
237 			die("unable to load disk image %s", image_filename);
238 	}
239 
240 	strcpy(real_cmdline, "notsc nolapic noacpi pci=conf1 console=ttyS0 ");
241 	if (!kernel_cmdline || !strstr(kernel_cmdline, "root=")) {
242 		strlcat(real_cmdline, "root=/dev/vda rw ",
243 				sizeof(real_cmdline));
244 	}
245 
246 	if (kernel_cmdline) {
247 		strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline));
248 		real_cmdline[sizeof(real_cmdline)-1] = '\0';
249 	}
250 
251 	if (!kvm__load_kernel(kvm, kernel_filename, initrd_filename,
252 				real_cmdline))
253 		die("unable to load kernel %s", kernel_filename);
254 
255 	ioport__setup_legacy();
256 
257 	kvm__setup_bios(kvm);
258 
259 	serial8250__init(kvm);
260 
261 	pci__init();
262 
263 	virtio_blk__init(kvm);
264 
265 	virtio_console__init(kvm);
266 
267 	if (!network)
268 		network = DEFAULT_NETWORK;
269 
270 	if (!strncmp(network, "virtio", 6))
271 		virtio_net__init(kvm, host_ip_addr);
272 
273 	kvm__start_timer(kvm);
274 
275 	for (i = 0; i < nrcpus; i++) {
276 		kvm_cpus[i] = kvm_cpu__init(kvm, i);
277 		if (!kvm_cpus[i])
278 			die("unable to initialize KVM VCPU");
279 
280 		if (single_step)
281 			kvm_cpu__enable_singlestep(kvm_cpus[i]);
282 
283 		if (pthread_create(&kvm_cpus[i]->thread, NULL, kvm_cpu_thread, kvm_cpus[i]) != 0)
284 			die("unable to create KVM VCPU thread");
285 	}
286 
287 	for (i = 0; i < nrcpus; i++) {
288 		void *ret;
289 
290 		if (pthread_join(kvm_cpus[i]->thread, &ret) != 0)
291 			die("pthread_join");
292 
293 		if (ret != NULL)
294 			exit_code	= 1;
295 	}
296 
297 	disk_image__close(kvm->disk_image);
298 	kvm__delete(kvm);
299 
300 	if (!exit_code)
301 		printf("\n  # KVM session ended normally.\n");
302 
303 	return exit_code;
304 }
305