xref: /kvmtool/builtin-run.c (revision d77a9efad8f66513968dcf8b77ce3707ed31861e)
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 
10 /* user defined header files */
11 #include <linux/types.h>
12 #include <kvm/kvm.h>
13 #include <kvm/kvm-cpu.h>
14 #include <kvm/8250-serial.h>
15 #include <kvm/virtio-blk.h>
16 #include <kvm/virtio-console.h>
17 #include <kvm/disk-image.h>
18 #include <kvm/util.h>
19 #include <kvm/pci.h>
20 #include <kvm/term.h>
21 
22 /* header files for gitish interface  */
23 #include <kvm/kvm-run.h>
24 #include <kvm/parse-options.h>
25 
26 #define DEFAULT_KVM_DEV		"/dev/kvm"
27 
28 #define MB_SHIFT		(20)
29 #define MIN_RAM_SIZE_MB		(64ULL)
30 #define MIN_RAM_SIZE_BYTE	(MIN_RAM_SIZE_MB << MB_SHIFT)
31 
32 #define KVM_NR_CPUS		(255)
33 
34 static struct kvm *kvm;
35 static struct kvm_cpu *kvm_cpus[KVM_NR_CPUS];
36 static __thread struct kvm_cpu *current_kvm_cpu;
37 
38 static void handle_sigint(int sig)
39 {
40 	exit(1);
41 }
42 
43 static void handle_sigquit(int sig)
44 {
45 	serial8250__inject_sysrq(kvm);
46 }
47 
48 static void handle_sigalrm(int sig)
49 {
50 	serial8250__inject_interrupt(kvm);
51 	virtio_console__inject_interrupt(kvm);
52 }
53 
54 static u64 ram_size = MIN_RAM_SIZE_MB;
55 static const char *kernel_cmdline;
56 static const char *kernel_filename;
57 static const char *initrd_filename;
58 static const char *image_filename;
59 static const char *kvm_dev;
60 static bool single_step;
61 static bool virtio_console;
62 extern bool ioport_debug;
63 extern int  active_console;
64 
65 static int nrcpus = 1;
66 
67 static const char * const run_usage[] = {
68 	"kvm run [<options>] <kernel image>",
69 	NULL
70 };
71 
72 static const struct option options[] = {
73 	OPT_U64('m', "mem", &ram_size, "Virtual machine memory size in MiB."),
74 	OPT_STRING('p', "params", &kernel_cmdline, "params",
75 			"Kernel command line arguments"),
76 	OPT_STRING('r', "initrd", &initrd_filename, "initrd",
77 			"Initial RAM disk image"),
78 	OPT_STRING('k', "kernel", &kernel_filename, "kernel",
79 			"Kernel to boot in virtual machine"),
80 	OPT_STRING('i', "image", &image_filename, "image", "Disk image"),
81 	OPT_STRING('d', "kvm-dev", &kvm_dev, "kvm-dev", "KVM device file"),
82 	OPT_BOOLEAN('s', "single-step", &single_step,
83 			"Enable single stepping"),
84 	OPT_BOOLEAN('g', "ioport-debug", &ioport_debug,
85 			"Enable ioport debugging"),
86 	OPT_BOOLEAN('c', "enable-virtio-console", &virtio_console,
87 			"Enable the virtual IO console"),
88 	OPT_INTEGER('\0', "cpus", &nrcpus, "Number of CPUs"),
89 	OPT_END()
90 };
91 
92 static void *kvm_cpu_thread(void *arg)
93 {
94 	current_kvm_cpu		= arg;
95 
96 	if (kvm_cpu__start(current_kvm_cpu))
97 		goto panic_kvm;
98 
99 	kvm_cpu__delete(current_kvm_cpu);
100 
101 	return (void *) (intptr_t) 0;
102 
103 panic_kvm:
104 	fprintf(stderr, "KVM exit reason: %" PRIu32 " (\"%s\")\n",
105 		current_kvm_cpu->kvm_run->exit_reason,
106 		kvm_exit_reasons[current_kvm_cpu->kvm_run->exit_reason]);
107 	if (current_kvm_cpu->kvm_run->exit_reason == KVM_EXIT_UNKNOWN)
108 		fprintf(stderr, "KVM exit code: 0x%Lu\n",
109 			current_kvm_cpu->kvm_run->hw.hardware_exit_reason);
110 	disk_image__close(kvm->disk_image);
111 	kvm_cpu__show_registers(current_kvm_cpu);
112 	kvm_cpu__show_code(current_kvm_cpu);
113 	kvm_cpu__show_page_tables(current_kvm_cpu);
114 
115 	kvm_cpu__delete(current_kvm_cpu);
116 
117 	return (void *) (intptr_t) 1;
118 }
119 
120 int kvm_cmd_run(int argc, const char **argv, const char *prefix)
121 {
122 	static char real_cmdline[2048];
123 	int exit_code = 0;
124 	int i;
125 
126 	signal(SIGALRM, handle_sigalrm);
127 	signal(SIGQUIT, handle_sigquit);
128 	signal(SIGINT, handle_sigint);
129 
130 	if (!argv || !*argv) {
131 		/* no argument specified */
132 		usage_with_options(run_usage, options);
133 		return EINVAL;
134 	}
135 
136 	while (argc != 0) {
137 		argc = parse_options(argc, argv, options, run_usage,
138 				PARSE_OPT_STOP_AT_NON_OPTION);
139 		if (argc != 0) {
140 			if (kernel_filename) {
141 				fprintf(stderr, "Cannot handle parameter: "
142 						"%s\n", argv[0]);
143 				usage_with_options(run_usage, options);
144 				return EINVAL;
145 			}
146 			/* first unhandled parameter is treated as a kernel
147 			   image
148 			 */
149 			kernel_filename = argv[0];
150 			argv++;
151 			argc--;
152 		}
153 
154 	}
155 
156 	if (nrcpus < 1 || nrcpus > KVM_NR_CPUS)
157 		die("Number of CPUs %d is out of [1;%d] range", nrcpus, KVM_NR_CPUS);
158 
159 	/* FIXME: Remove as only SMP gets fully supported */
160 	if (nrcpus > 1)
161 		warning("Limiting CPUs to 1, true SMP is not yet implemented");
162 
163 	if (ram_size < MIN_RAM_SIZE_MB)
164 		die("Not enough memory specified: %lluMB (min %lluMB)", ram_size, MIN_RAM_SIZE_MB);
165 
166 	ram_size <<= MB_SHIFT;
167 
168 	if (!kvm_dev)
169 		kvm_dev = DEFAULT_KVM_DEV;
170 
171 	if (virtio_console == true)
172 		active_console  = CONSOLE_VIRTIO;
173 
174 	term_init();
175 
176 	kvm = kvm__init(kvm_dev, ram_size);
177 
178 	if (image_filename) {
179 		kvm->disk_image	= disk_image__open(image_filename);
180 		if (!kvm->disk_image)
181 			die("unable to load disk image %s", image_filename);
182 	}
183 
184 	strcpy(real_cmdline, "notsc nolapic noacpi pci=conf1 console=ttyS0 ");
185 	if (!kernel_cmdline || !strstr(kernel_cmdline, "root=")) {
186 		strlcat(real_cmdline, "root=/dev/vda rw ",
187 				sizeof(real_cmdline));
188 	}
189 
190 	if (kernel_cmdline) {
191 		strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline));
192 		real_cmdline[sizeof(real_cmdline)-1] = '\0';
193 	}
194 
195 	if (!kvm__load_kernel(kvm, kernel_filename, initrd_filename,
196 				real_cmdline))
197 		die("unable to load kernel %s", kernel_filename);
198 
199 	kvm__setup_bios(kvm);
200 
201 	serial8250__init(kvm);
202 
203 	pci__init();
204 
205 	virtio_blk__init(kvm);
206 
207 	virtio_console__init(kvm);
208 
209 	kvm__start_timer(kvm);
210 
211 	for (i = 0; i < nrcpus; i++) {
212 		kvm_cpus[i] = kvm_cpu__init(kvm, i);
213 		if (!kvm_cpus[i])
214 			die("unable to initialize KVM VCPU");
215 
216 		if (single_step)
217 			kvm_cpu__enable_singlestep(kvm_cpus[i]);
218 
219 		if (pthread_create(&kvm_cpus[i]->thread, NULL, kvm_cpu_thread, kvm_cpus[i]) != 0)
220 			die("unable to create KVM VCPU thread");
221 	}
222 
223 	for (i = 0; i < nrcpus; i++) {
224 		void *ret;
225 
226 		if (pthread_join(kvm_cpus[i]->thread, &ret) != 0)
227 			die("pthread_join");
228 
229 		if (ret != NULL)
230 			exit_code	= 1;
231 	}
232 
233 	disk_image__close(kvm->disk_image);
234 	kvm__delete(kvm);
235 
236 	if (!exit_code)
237 		printf("\n  # KVM session ended normally.\n");
238 
239 	return exit_code;
240 }
241