hw/xen_domainbuild.c

   1 #include <signal.h>
   2 #include "xen_backend.h"
   3 #include "xen_domainbuild.h"
   4 #include "sysemu.h"
   5 #include "qemu-timer.h"
   6
   7 #include <xenguest.h>
   8
   9 static int xenstore_domain_mkdir(char *path)
  10 {
  11     struct xs_permissions perms_ro[] = {{
  12             .id    = 0, /* set owner: dom0 */
  13         },{
  14             .id    = xen_domid,
  15             .perms = XS_PERM_READ,
  16         }};
  17     struct xs_permissions perms_rw[] = {{
  18             .id    = 0, /* set owner: dom0 */
  19         },{
  20             .id    = xen_domid,
  21             .perms = XS_PERM_READ | XS_PERM_WRITE,
  22         }};
  23     const char *writable[] = { "device", "control", "error", NULL };
  24     char subpath[256];
  25     int i;
  26
  27     if (!xs_mkdir(xenstore, 0, path)) {
  28         fprintf(stderr, "%s: xs_mkdir %s: failed\n", __FUNCTION__, path);
  29         return -1;
  30     }
  31     if (!xs_set_permissions(xenstore, 0, path, perms_ro, 2)) {
  32         fprintf(stderr, "%s: xs_set_permissions failed\n", __FUNCTION__);
  33         return -1;
  34     }
  35
  36     for (i = 0; writable[i]; i++) {
  37         snprintf(subpath, sizeof(subpath), "%s/%s", path, writable[i]);
  38         if (!xs_mkdir(xenstore, 0, subpath)) {
  39             fprintf(stderr, "%s: xs_mkdir %s: failed\n", __FUNCTION__, subpath);
  40             return -1;
  41         }
  42         if (!xs_set_permissions(xenstore, 0, subpath, perms_rw, 2)) {
  43             fprintf(stderr, "%s: xs_set_permissions failed\n", __FUNCTION__);
  44             return -1;
  45         }
  46     }
  47     return 0;
  48 }
  49
  50 int xenstore_domain_init1(const char *kernel, const char *ramdisk,
  51                           const char *cmdline)
  52 {
  53     char *dom, uuid_string[42], vm[256], path[256];
  54     int i;
  55
  56     snprintf(uuid_string, sizeof(uuid_string), UUID_FMT,
  57              qemu_uuid[0], qemu_uuid[1], qemu_uuid[2], qemu_uuid[3],
  58              qemu_uuid[4], qemu_uuid[5], qemu_uuid[6], qemu_uuid[7],
  59              qemu_uuid[8], qemu_uuid[9], qemu_uuid[10], qemu_uuid[11],
  60              qemu_uuid[12], qemu_uuid[13], qemu_uuid[14], qemu_uuid[15]);
  61     dom = xs_get_domain_path(xenstore, xen_domid);
  62     snprintf(vm,  sizeof(vm),  "/vm/%s", uuid_string);
  63
  64     xenstore_domain_mkdir(dom);
  65
  66     xenstore_write_str(vm, "image/ostype",  "linux");
  67     if (kernel)
  68         xenstore_write_str(vm, "image/kernel",  kernel);
  69     if (ramdisk)
  70         xenstore_write_str(vm, "image/ramdisk", ramdisk);
  71     if (cmdline)
  72         xenstore_write_str(vm, "image/cmdline", cmdline);
  73
  74     /* name + id */
  75     xenstore_write_str(vm,  "name",   qemu_name ? qemu_name : "no-name");
  76     xenstore_write_str(vm,  "uuid",   uuid_string);
  77     xenstore_write_str(dom, "name",   qemu_name ? qemu_name : "no-name");
  78     xenstore_write_int(dom, "domid",  xen_domid);
  79     xenstore_write_str(dom, "vm",     vm);
  80
  81     /* memory */
  82     xenstore_write_int(dom, "memory/target", ram_size >> 10);  // kB
  83     xenstore_write_int(vm, "memory",         ram_size >> 20);  // MB
  84     xenstore_write_int(vm, "maxmem",         ram_size >> 20);  // MB
  85
  86     /* cpus */
  87     for (i = 0; i < smp_cpus; i++) {
  88         snprintf(path, sizeof(path), "cpu/%d/availability",i);
  89         xenstore_write_str(dom, path, "online");
  90     }
  91     xenstore_write_int(vm, "vcpu_avail",  smp_cpus);
  92     xenstore_write_int(vm, "vcpus",       smp_cpus);
  93
  94     /* vnc password */
  95     xenstore_write_str(vm, "vncpassword", "" /* FIXME */);
  96
  97     free(dom);
  98     return 0;
  99 }
 100
 101 int xenstore_domain_init2(int xenstore_port, int xenstore_mfn,
 102                           int console_port, int console_mfn)
 103 {
 104     char *dom;
 105
 106     dom = xs_get_domain_path(xenstore, xen_domid);
 107
 108     /* signal new domain */
 109     xs_introduce_domain(xenstore,
 110                         xen_domid,
 111                         xenstore_mfn,
 112                         xenstore_port);
 113
 114     /* xenstore */
 115     xenstore_write_int(dom, "store/ring-ref",   xenstore_mfn);
 116     xenstore_write_int(dom, "store/port",       xenstore_port);
 117
 118     /* console */
 119     xenstore_write_str(dom, "console/type",     "ioemu");
 120     xenstore_write_int(dom, "console/limit",    128 * 1024);
 121     xenstore_write_int(dom, "console/ring-ref", console_mfn);
 122     xenstore_write_int(dom, "console/port",     console_port);
 123     xen_config_dev_console(0);
 124
 125     free(dom);
 126     return 0;
 127 }
 128
 129 /* ------------------------------------------------------------- */
 130
 131 static QEMUTimer *xen_poll;
 132
 133 /* check domain state once per second */
 134 static void xen_domain_poll(void *opaque)
 135 {
 136     struct xc_dominfo info;
 137     int rc;
 138
 139     rc = xc_domain_getinfo(xen_xc, xen_domid, 1, &info);
 140     if ((rc != 1) || (info.domid != xen_domid)) {
 141         qemu_log("xen: domain %d is gone\n", xen_domid);
 142         goto quit;
 143     }
 144     if (info.dying) {
 145         qemu_log("xen: domain %d is dying (%s%s)\n", xen_domid,
 146                  info.crashed  ? "crashed"  : "",
 147                  info.shutdown ? "shutdown" : "");
 148         goto quit;
 149     }
 150
 151     qemu_mod_timer(xen_poll, qemu_get_clock(rt_clock) + 1000);
 152     return;
 153
 154 quit:
 155     qemu_system_shutdown_request();
 156     return;
 157 }
 158
 159 static void xen_domain_watcher(void)
 160 {
 161     int qemu_running = 1;
 162     int fd[2], i, n, rc;
 163     char byte;
 164
 165     pipe(fd);
 166     if (fork() != 0)
 167         return; /* not child */
 168
 169     /* close all file handles, except stdio/out/err,
 170      * our watch pipe and the xen interface handle */
 171     n = getdtablesize();
 172     for (i = 3; i < n; i++) {
 173         if (i == fd[0])
 174             continue;
 175         if (i == xen_xc)
 176             continue;
 177         close(i);
 178     }
 179
 180     /* ignore term signals */
 181     signal(SIGINT,  SIG_IGN);
 182     signal(SIGTERM, SIG_IGN);
 183
 184     /* wait for qemu exiting */
 185     while (qemu_running) {
 186         rc = read(fd[0], &byte, 1);
 187         switch (rc) {
 188         case -1:
 189             if (errno == EINTR)
 190                 continue;
 191             qemu_log("%s: Huh? read error: %s\n", __FUNCTION__, strerror(errno));
 192             qemu_running = 0;
 193             break;
 194         case 0:
 195             /* EOF -> qemu exited */
 196             qemu_running = 0;
 197             break;
 198         default:
 199             qemu_log("%s: Huh? data on the watch pipe?\n", __FUNCTION__);
 200             break;
 201         }
 202     }
 203
 204     /* cleanup */
 205     qemu_log("%s: destroy domain %d\n", __FUNCTION__, xen_domid);
 206     xc_domain_destroy(xen_xc, xen_domid);
 207     _exit(0);
 208 }
 209
 210 /* normal cleanup */
 211 static void xen_domain_cleanup(void)
 212 {
 213     char *dom;
 214
 215     dom = xs_get_domain_path(xenstore, xen_domid);
 216     if (dom) {
 217         xs_rm(xenstore, 0, dom);
 218         free(dom);
 219     }
 220     xs_release_domain(xenstore, xen_domid);
 221 }
 222
 223 int xen_domain_build_pv(const char *kernel, const char *ramdisk,
 224                         const char *cmdline)
 225 {
 226     uint32_t ssidref = 0;
 227     uint32_t flags = 0;
 228     xen_domain_handle_t uuid;
 229     unsigned int xenstore_port = 0, console_port = 0;
 230     unsigned long xenstore_mfn = 0, console_mfn = 0;
 231     int rc;
 232
 233     memcpy(uuid, qemu_uuid, sizeof(uuid));
 234     rc = xc_domain_create(xen_xc, ssidref, uuid, flags, &xen_domid);
 235     if (rc < 0) {
 236         fprintf(stderr, "xen: xc_domain_create() failed\n");
 237         goto err;
 238     }
 239     qemu_log("xen: created domain %d\n", xen_domid);
 240     atexit(xen_domain_cleanup);
 241     xen_domain_watcher();
 242
 243     xenstore_domain_init1(kernel, ramdisk, cmdline);
 244
 245     rc = xc_domain_max_vcpus(xen_xc, xen_domid, smp_cpus);
 246     if (rc < 0) {
 247         fprintf(stderr, "xen: xc_domain_max_vcpus() failed\n");
 248         goto err;
 249     }
 250
 251 #if 0
 252     rc = xc_domain_setcpuweight(xen_xc, xen_domid, 256);
 253     if (rc < 0) {
 254         fprintf(stderr, "xen: xc_domain_setcpuweight() failed\n");
 255         goto err;
 256     }
 257 #endif
 258
 259     rc = xc_domain_setmaxmem(xen_xc, xen_domid, ram_size >> 10);
 260     if (rc < 0) {
 261         fprintf(stderr, "xen: xc_domain_setmaxmem() failed\n");
 262         goto err;
 263     }
 264
 265     xenstore_port = xc_evtchn_alloc_unbound(xen_xc, xen_domid, 0);
 266     console_port = xc_evtchn_alloc_unbound(xen_xc, xen_domid, 0);
 267
 268     rc = xc_linux_build(xen_xc, xen_domid, ram_size >> 20,
 269                         kernel, ramdisk, cmdline,
 270                         0, flags,
 271                         xenstore_port, &xenstore_mfn,
 272                         console_port, &console_mfn);
 273     if (rc < 0) {
 274         fprintf(stderr, "xen: xc_linux_build() failed\n");
 275         goto err;
 276     }
 277
 278     xenstore_domain_init2(xenstore_port, xenstore_mfn,
 279                           console_port, console_mfn);
 280
 281     qemu_log("xen: unpausing domain %d\n", xen_domid);
 282     rc = xc_domain_unpause(xen_xc, xen_domid);
 283     if (rc < 0) {
 284         fprintf(stderr, "xen: xc_domain_unpause() failed\n");
 285         goto err;
 286     }
 287
 288     xen_poll = qemu_new_timer(rt_clock, xen_domain_poll, NULL);
 289     qemu_mod_timer(xen_poll, qemu_get_clock(rt_clock) + 1000);
 290     return 0;
 291
 292 err:
 293     return -1;
 294 }