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machine.c
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machine.c
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/*
* VM utilities
*
* Copyright (c) 2017 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include "cutils.h"
#include "iomem.h"
#include "virtio.h"
#include "machine.h"
#include "fs_utils.h"
#ifdef CONFIG_FS_NET
#include "fs_wget.h"
#endif
void __attribute__((format(printf, 1, 2))) vm_error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
#ifdef EMSCRIPTEN
vprintf(fmt, ap);
#else
vfprintf(stderr, fmt, ap);
#endif
va_end(ap);
}
int vm_get_int(JSONValue obj, const char *name, int *pval)
{
JSONValue val;
val = json_object_get(obj, name);
if (json_is_undefined(val)) {
vm_error("expecting '%s' property\n", name);
return -1;
}
if (val.type != JSON_INT) {
vm_error("%s: integer expected\n", name);
return -1;
}
*pval = val.u.int32;
return 0;
}
int vm_get_int_opt(JSONValue obj, const char *name, int *pval, int def_val)
{
JSONValue val;
val = json_object_get(obj, name);
if (json_is_undefined(val)) {
*pval = def_val;
return 0;
}
if (val.type != JSON_INT) {
vm_error("%s: integer expected\n", name);
return -1;
}
*pval = val.u.int32;
return 0;
}
static int vm_get_str2(JSONValue obj, const char *name, const char **pstr,
BOOL is_opt)
{
JSONValue val;
val = json_object_get(obj, name);
if (json_is_undefined(val)) {
if (is_opt) {
*pstr = NULL;
return 0;
} else {
vm_error("expecting '%s' property\n", name);
return -1;
}
}
if (val.type != JSON_STR) {
vm_error("%s: string expected\n", name);
return -1;
}
*pstr = val.u.str->data;
return 0;
}
static int vm_get_str(JSONValue obj, const char *name, const char **pstr)
{
return vm_get_str2(obj, name, pstr, FALSE);
}
static int vm_get_str_opt(JSONValue obj, const char *name, const char **pstr)
{
return vm_get_str2(obj, name, pstr, TRUE);
}
static char *strdup_null(const char *str)
{
if (!str)
return NULL;
else
return strdup(str);
}
/* currently only for "TZ" */
static char *cmdline_subst(const char *cmdline)
{
DynBuf dbuf;
const char *p;
char var_name[32], *q, buf[32];
dbuf_init(&dbuf);
p = cmdline;
while (*p != '\0') {
if (p[0] == '$' && p[1] == '{') {
p += 2;
q = var_name;
while (*p != '\0' && *p != '}') {
if ((q - var_name) < sizeof(var_name) - 1)
*q++ = *p;
p++;
}
*q = '\0';
if (*p == '}')
p++;
if (!strcmp(var_name, "TZ")) {
time_t ti;
struct tm tm;
int n, sg;
/* get the offset to UTC */
time(&ti);
localtime_r(&ti, &tm);
n = tm.tm_gmtoff / 60;
sg = '-';
if (n < 0) {
sg = '+';
n = -n;
}
snprintf(buf, sizeof(buf), "UTC%c%02d:%02d",
sg, n / 60, n % 60);
dbuf_putstr(&dbuf, buf);
}
} else {
dbuf_putc(&dbuf, *p++);
}
}
dbuf_putc(&dbuf, 0);
return (char *)dbuf.buf;
}
static BOOL find_name(const char *name, const char *name_list)
{
size_t len;
const char *p, *r;
p = name_list;
for(;;) {
r = strchr(p, ',');
if (!r) {
if (!strcmp(name, p))
return TRUE;
break;
} else {
len = r - p;
if (len == strlen(name) && !memcmp(name, p, len))
return TRUE;
p = r + 1;
}
}
return FALSE;
}
static const VirtMachineClass *virt_machine_list[] = {
#if defined(EMSCRIPTEN)
/* only a single machine in the EMSCRIPTEN target */
#ifndef CONFIG_X86EMU
&riscv_machine_class,
#endif
#else
&riscv_machine_class,
#endif /* !EMSCRIPTEN */
#ifdef CONFIG_X86EMU
&pc_machine_class,
#endif
NULL,
};
static const VirtMachineClass *virt_machine_find_class(const char *machine_name)
{
const VirtMachineClass *vmc, **pvmc;
for(pvmc = virt_machine_list; *pvmc != NULL; pvmc++) {
vmc = *pvmc;
if (find_name(machine_name, vmc->machine_names))
return vmc;
}
return NULL;
}
static int virt_machine_parse_config(VirtMachineParams *p,
char *config_file_str, int len)
{
int version, val;
const char *tag_name, *str;
char buf1[256];
JSONValue cfg, obj, el;
cfg = json_parse_value_len(config_file_str, len);
if (json_is_error(cfg)) {
vm_error("error: %s\n", json_get_error(cfg));
json_free(cfg);
return -1;
}
if (vm_get_int(cfg, "version", &version) < 0)
goto tag_fail;
if (version != VM_CONFIG_VERSION) {
if (version > VM_CONFIG_VERSION) {
vm_error("The emulator is too old to run this VM: please upgrade\n");
return -1;
} else {
vm_error("The VM configuration file is too old for this emulator version: please upgrade the VM configuration file\n");
return -1;
}
}
if (vm_get_str(cfg, "machine", &str) < 0)
goto tag_fail;
p->machine_name = strdup(str);
p->vmc = virt_machine_find_class(p->machine_name);
if (!p->vmc) {
vm_error("Unknown machine name: %s\n", p->machine_name);
goto tag_fail;
}
p->vmc->virt_machine_set_defaults(p);
tag_name = "memory_size";
if (vm_get_int(cfg, tag_name, &val) < 0)
goto tag_fail;
p->ram_size = (uint64_t)val << 20;
tag_name = "bios";
if (vm_get_str_opt(cfg, tag_name, &str) < 0)
goto tag_fail;
if (str) {
p->files[VM_FILE_BIOS].filename = strdup(str);
}
tag_name = "kernel";
if (vm_get_str_opt(cfg, tag_name, &str) < 0)
goto tag_fail;
if (str) {
p->files[VM_FILE_KERNEL].filename = strdup(str);
}
tag_name = "initrd";
if (vm_get_str_opt(cfg, tag_name, &str) < 0)
goto tag_fail;
if (str) {
p->files[VM_FILE_INITRD].filename = strdup(str);
}
if (vm_get_str_opt(cfg, "cmdline", &str) < 0)
goto tag_fail;
if (str) {
p->cmdline = cmdline_subst(str);
}
for(;;) {
snprintf(buf1, sizeof(buf1), "drive%d", p->drive_count);
obj = json_object_get(cfg, buf1);
if (json_is_undefined(obj))
break;
if (p->drive_count >= MAX_DRIVE_DEVICE) {
vm_error("Too many drives\n");
return -1;
}
if (vm_get_str(obj, "file", &str) < 0)
goto tag_fail;
p->tab_drive[p->drive_count].filename = strdup(str);
if (vm_get_str_opt(obj, "device", &str) < 0)
goto tag_fail;
p->tab_drive[p->drive_count].device = strdup_null(str);
p->drive_count++;
}
for(;;) {
snprintf(buf1, sizeof(buf1), "fs%d", p->fs_count);
obj = json_object_get(cfg, buf1);
if (json_is_undefined(obj))
break;
if (p->fs_count >= MAX_DRIVE_DEVICE) {
vm_error("Too many filesystems\n");
return -1;
}
if (vm_get_str(obj, "file", &str) < 0)
goto tag_fail;
p->tab_fs[p->fs_count].filename = strdup(str);
if (vm_get_str_opt(obj, "tag", &str) < 0)
goto tag_fail;
if (!str) {
if (p->fs_count == 0)
strcpy(buf1, "/dev/root");
else
snprintf(buf1, sizeof(buf1), "/dev/root%d", p->fs_count);
str = buf1;
}
p->tab_fs[p->fs_count].tag = strdup(str);
p->fs_count++;
}
for(;;) {
snprintf(buf1, sizeof(buf1), "eth%d", p->eth_count);
obj = json_object_get(cfg, buf1);
if (json_is_undefined(obj))
break;
if (p->eth_count >= MAX_ETH_DEVICE) {
vm_error("Too many ethernet interfaces\n");
return -1;
}
if (vm_get_str(obj, "driver", &str) < 0)
goto tag_fail;
p->tab_eth[p->eth_count].driver = strdup(str);
if (!strcmp(str, "tap")) {
if (vm_get_str(obj, "ifname", &str) < 0)
goto tag_fail;
p->tab_eth[p->eth_count].ifname = strdup(str);
}
p->eth_count++;
}
p->display_device = NULL;
obj = json_object_get(cfg, "display0");
if (!json_is_undefined(obj)) {
if (vm_get_str(obj, "device", &str) < 0)
goto tag_fail;
p->display_device = strdup(str);
if (vm_get_int(obj, "width", &p->width) < 0)
goto tag_fail;
if (vm_get_int(obj, "height", &p->height) < 0)
goto tag_fail;
if (vm_get_str_opt(obj, "vga_bios", &str) < 0)
goto tag_fail;
if (str) {
p->files[VM_FILE_VGA_BIOS].filename = strdup(str);
}
}
if (vm_get_str_opt(cfg, "input_device", &str) < 0)
goto tag_fail;
p->input_device = strdup_null(str);
if (vm_get_str_opt(cfg, "accel", &str) < 0)
goto tag_fail;
if (str) {
if (!strcmp(str, "none")) {
p->accel_enable = FALSE;
} else if (!strcmp(str, "auto")) {
p->accel_enable = TRUE;
} else {
vm_error("unsupported 'accel' config: %s\n", str);
return -1;
}
}
tag_name = "rtc_local_time";
el = json_object_get(cfg, tag_name);
if (!json_is_undefined(el)) {
if (el.type != JSON_BOOL) {
vm_error("%s: boolean expected\n", tag_name);
goto tag_fail;
}
p->rtc_local_time = el.u.b;
}
json_free(cfg);
return 0;
tag_fail:
json_free(cfg);
return -1;
}
typedef void FSLoadFileCB(void *opaque, uint8_t *buf, int buf_len);
typedef struct {
VirtMachineParams *vm_params;
void (*start_cb)(void *opaque);
void *opaque;
FSLoadFileCB *file_load_cb;
void *file_load_opaque;
int file_index;
} VMConfigLoadState;
static void config_file_loaded(void *opaque, uint8_t *buf, int buf_len);
static void config_additional_file_load(VMConfigLoadState *s);
static void config_additional_file_load_cb(void *opaque,
uint8_t *buf, int buf_len);
/* XXX: win32, URL */
char *get_file_path(const char *base_filename, const char *filename)
{
int len, len1;
char *fname, *p;
if (!base_filename)
goto done;
if (strchr(filename, ':'))
goto done; /* full URL */
if (filename[0] == '/')
goto done;
p = strrchr(base_filename, '/');
if (!p) {
done:
return strdup(filename);
}
len = p + 1 - base_filename;
len1 = strlen(filename);
fname = malloc(len + len1 + 1);
memcpy(fname, base_filename, len);
memcpy(fname + len, filename, len1 + 1);
return fname;
}
#ifdef EMSCRIPTEN
static int load_file(uint8_t **pbuf, const char *filename)
{
abort();
}
#else
/* return -1 if error. */
static int load_file(uint8_t **pbuf, const char *filename)
{
FILE *f;
int size;
uint8_t *buf;
f = fopen(filename, "rb");
if (!f) {
perror(filename);
exit(1);
}
fseek(f, 0, SEEK_END);
size = ftell(f);
fseek(f, 0, SEEK_SET);
buf = malloc(size);
if (fread(buf, 1, size, f) != size) {
fprintf(stderr, "%s: read error\n", filename);
exit(1);
}
fclose(f);
*pbuf = buf;
return size;
}
#endif
#ifdef CONFIG_FS_NET
static void config_load_file_cb(void *opaque, int err, void *data, size_t size)
{
VMConfigLoadState *s = opaque;
// printf("err=%d data=%p size=%ld\n", err, data, size);
if (err < 0) {
vm_error("Error %d while loading file\n", -err);
exit(1);
}
s->file_load_cb(s->file_load_opaque, data, size);
}
#endif
static void config_load_file(VMConfigLoadState *s, const char *filename,
FSLoadFileCB *cb, void *opaque)
{
// printf("loading %s\n", filename);
#ifdef CONFIG_FS_NET
if (is_url(filename)) {
s->file_load_cb = cb;
s->file_load_opaque = opaque;
fs_wget(filename, NULL, NULL, s, config_load_file_cb, TRUE);
} else
#endif
{
uint8_t *buf;
int size;
size = load_file(&buf, filename);
cb(opaque, buf, size);
free(buf);
}
}
void virt_machine_load_config_file(VirtMachineParams *p,
const char *filename,
void (*start_cb)(void *opaque),
void *opaque)
{
VMConfigLoadState *s;
s = mallocz(sizeof(*s));
s->vm_params = p;
s->start_cb = start_cb;
s->opaque = opaque;
p->cfg_filename = strdup(filename);
config_load_file(s, filename, config_file_loaded, s);
}
static void config_file_loaded(void *opaque, uint8_t *buf, int buf_len)
{
VMConfigLoadState *s = opaque;
VirtMachineParams *p = s->vm_params;
if (virt_machine_parse_config(p, (char *)buf, buf_len) < 0)
exit(1);
/* load the additional files */
s->file_index = 0;
config_additional_file_load(s);
}
static void config_additional_file_load(VMConfigLoadState *s)
{
VirtMachineParams *p = s->vm_params;
while (s->file_index < VM_FILE_COUNT &&
p->files[s->file_index].filename == NULL) {
s->file_index++;
}
if (s->file_index == VM_FILE_COUNT) {
if (s->start_cb)
s->start_cb(s->opaque);
free(s);
} else {
char *fname;
fname = get_file_path(p->cfg_filename,
p->files[s->file_index].filename);
config_load_file(s, fname,
config_additional_file_load_cb, s);
free(fname);
}
}
static void config_additional_file_load_cb(void *opaque,
uint8_t *buf, int buf_len)
{
VMConfigLoadState *s = opaque;
VirtMachineParams *p = s->vm_params;
p->files[s->file_index].buf = malloc(buf_len);
memcpy(p->files[s->file_index].buf, buf, buf_len);
p->files[s->file_index].len = buf_len;
/* load the next files */
s->file_index++;
config_additional_file_load(s);
}
void vm_add_cmdline(VirtMachineParams *p, const char *cmdline)
{
char *new_cmdline, *old_cmdline;
if (cmdline[0] == '!') {
new_cmdline = strdup(cmdline + 1);
} else {
old_cmdline = p->cmdline;
if (!old_cmdline)
old_cmdline = "";
new_cmdline = malloc(strlen(old_cmdline) + 1 + strlen(cmdline) + 1);
strcpy(new_cmdline, old_cmdline);
strcat(new_cmdline, " ");
strcat(new_cmdline, cmdline);
}
free(p->cmdline);
p->cmdline = new_cmdline;
}
void virt_machine_free_config(VirtMachineParams *p)
{
int i;
free(p->machine_name);
free(p->cmdline);
for(i = 0; i < VM_FILE_COUNT; i++) {
free(p->files[i].filename);
free(p->files[i].buf);
}
for(i = 0; i < p->drive_count; i++) {
free(p->tab_drive[i].filename);
free(p->tab_drive[i].device);
}
for(i = 0; i < p->fs_count; i++) {
free(p->tab_fs[i].filename);
free(p->tab_fs[i].tag);
}
for(i = 0; i < p->eth_count; i++) {
free(p->tab_eth[i].driver);
free(p->tab_eth[i].ifname);
}
free(p->input_device);
free(p->display_device);
free(p->cfg_filename);
}
VirtMachine *virt_machine_init(const VirtMachineParams *p)
{
const VirtMachineClass *vmc = p->vmc;
return vmc->virt_machine_init(p);
}
void virt_machine_set_defaults(VirtMachineParams *p)
{
memset(p, 0, sizeof(*p));
}
void virt_machine_end(VirtMachine *s)
{
s->vmc->virt_machine_end(s);
}