spice-qemu-char.c

   1 #include "qemu/osdep.h"
   2 #include "trace-root.h"
   3 #include "ui/qemu-spice.h"
   4 #include "sysemu/char.h"
   5 #include "qemu/error-report.h"
   6 #include <spice.h>
   7 #include <spice/protocol.h>
   8
   9
  10 typedef struct SpiceChardev {
  11     Chardev               parent;
  12
  13     SpiceCharDeviceInstance sin;
  14     bool                  active;
  15     bool                  blocked;
  16     const uint8_t         *datapos;
  17     int                   datalen;
  18     QLIST_ENTRY(SpiceChardev) next;
  19 } SpiceChardev;
  20
  21 #define TYPE_CHARDEV_SPICE "chardev-spice"
  22 #define TYPE_CHARDEV_SPICEVMC "chardev-spicevmc"
  23 #define TYPE_CHARDEV_SPICEPORT "chardev-spiceport"
  24
  25 #define SPICE_CHARDEV(obj) OBJECT_CHECK(SpiceChardev, (obj), TYPE_CHARDEV_SPICE)
  26
  27 typedef struct SpiceCharSource {
  28     GSource               source;
  29     SpiceChardev       *scd;
  30 } SpiceCharSource;
  31
  32 static QLIST_HEAD(, SpiceChardev) spice_chars =
  33     QLIST_HEAD_INITIALIZER(spice_chars);
  34
  35 static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
  36 {
  37     SpiceChardev *scd = container_of(sin, SpiceChardev, sin);
  38     Chardev *chr = CHARDEV(scd);
  39     ssize_t out = 0;
  40     ssize_t last_out;
  41     uint8_t* p = (uint8_t*)buf;
  42
  43     while (len > 0) {
  44         int can_write = qemu_chr_be_can_write(chr);
  45         last_out = MIN(len, can_write);
  46         if (last_out <= 0) {
  47             break;
  48         }
  49         qemu_chr_be_write(chr, p, last_out);
  50         out += last_out;
  51         len -= last_out;
  52         p += last_out;
  53     }
  54
  55     trace_spice_vmc_write(out, len + out);
  56     return out;
  57 }
  58
  59 static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
  60 {
  61     SpiceChardev *scd = container_of(sin, SpiceChardev, sin);
  62     int bytes = MIN(len, scd->datalen);
  63
  64     if (bytes > 0) {
  65         memcpy(buf, scd->datapos, bytes);
  66         scd->datapos += bytes;
  67         scd->datalen -= bytes;
  68         assert(scd->datalen >= 0);
  69     }
  70     if (scd->datalen == 0) {
  71         scd->datapos = 0;
  72         scd->blocked = false;
  73     }
  74     trace_spice_vmc_read(bytes, len);
  75     return bytes;
  76 }
  77
  78 #if SPICE_SERVER_VERSION >= 0x000c02
  79 static void vmc_event(SpiceCharDeviceInstance *sin, uint8_t event)
  80 {
  81     SpiceChardev *scd = container_of(sin, SpiceChardev, sin);
  82     Chardev *chr = CHARDEV(scd);
  83     int chr_event;
  84
  85     switch (event) {
  86     case SPICE_PORT_EVENT_BREAK:
  87         chr_event = CHR_EVENT_BREAK;
  88         break;
  89     default:
  90         return;
  91     }
  92
  93     trace_spice_vmc_event(chr_event);
  94     qemu_chr_be_event(chr, chr_event);
  95 }
  96 #endif
  97
  98 static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
  99 {
 100     SpiceChardev *scd = container_of(sin, SpiceChardev, sin);
 101     Chardev *chr = CHARDEV(scd);
 102
 103     if ((chr->be_open && connected) ||
 104         (!chr->be_open && !connected)) {
 105         return;
 106     }
 107
 108     qemu_chr_be_event(chr,
 109                       connected ? CHR_EVENT_OPENED : CHR_EVENT_CLOSED);
 110 }
 111
 112 static SpiceCharDeviceInterface vmc_interface = {
 113     .base.type          = SPICE_INTERFACE_CHAR_DEVICE,
 114     .base.description   = "spice virtual channel char device",
 115     .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
 116     .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
 117     .state              = vmc_state,
 118     .write              = vmc_write,
 119     .read               = vmc_read,
 120 #if SPICE_SERVER_VERSION >= 0x000c02
 121     .event              = vmc_event,
 122 #endif
 123 #if SPICE_SERVER_VERSION >= 0x000c06
 124     .flags              = SPICE_CHAR_DEVICE_NOTIFY_WRITABLE,
 125 #endif
 126 };
 127
 128
 129 static void vmc_register_interface(SpiceChardev *scd)
 130 {
 131     if (scd->active) {
 132         return;
 133     }
 134     scd->sin.base.sif = &vmc_interface.base;
 135     qemu_spice_add_interface(&scd->sin.base);
 136     scd->active = true;
 137     trace_spice_vmc_register_interface(scd);
 138 }
 139
 140 static void vmc_unregister_interface(SpiceChardev *scd)
 141 {
 142     if (!scd->active) {
 143         return;
 144     }
 145     spice_server_remove_interface(&scd->sin.base);
 146     scd->active = false;
 147     trace_spice_vmc_unregister_interface(scd);
 148 }
 149
 150 static gboolean spice_char_source_prepare(GSource *source, gint *timeout)
 151 {
 152     SpiceCharSource *src = (SpiceCharSource *)source;
 153
 154     *timeout = -1;
 155
 156     return !src->scd->blocked;
 157 }
 158
 159 static gboolean spice_char_source_check(GSource *source)
 160 {
 161     SpiceCharSource *src = (SpiceCharSource *)source;
 162
 163     return !src->scd->blocked;
 164 }
 165
 166 static gboolean spice_char_source_dispatch(GSource *source,
 167     GSourceFunc callback, gpointer user_data)
 168 {
 169     GIOFunc func = (GIOFunc)callback;
 170
 171     return func(NULL, G_IO_OUT, user_data);
 172 }
 173
 174 static GSourceFuncs SpiceCharSourceFuncs = {
 175     .prepare  = spice_char_source_prepare,
 176     .check    = spice_char_source_check,
 177     .dispatch = spice_char_source_dispatch,
 178 };
 179
 180 static GSource *spice_chr_add_watch(Chardev *chr, GIOCondition cond)
 181 {
 182     SpiceChardev *scd = SPICE_CHARDEV(chr);
 183     SpiceCharSource *src;
 184
 185     assert(cond & G_IO_OUT);
 186
 187     src = (SpiceCharSource *)g_source_new(&SpiceCharSourceFuncs,
 188                                           sizeof(SpiceCharSource));
 189     src->scd = scd;
 190
 191     return (GSource *)src;
 192 }
 193
 194 static int spice_chr_write(Chardev *chr, const uint8_t *buf, int len)
 195 {
 196     SpiceChardev *s = SPICE_CHARDEV(chr);
 197     int read_bytes;
 198
 199     assert(s->datalen == 0);
 200     s->datapos = buf;
 201     s->datalen = len;
 202     spice_server_char_device_wakeup(&s->sin);
 203     read_bytes = len - s->datalen;
 204     if (read_bytes != len) {
 205         /* We'll get passed in the unconsumed data with the next call */
 206         s->datalen = 0;
 207         s->datapos = NULL;
 208         s->blocked = true;
 209     }
 210     return read_bytes;
 211 }
 212
 213 static void char_spice_finalize(Object *obj)
 214 {
 215     SpiceChardev *s = SPICE_CHARDEV(obj);
 216
 217     vmc_unregister_interface(s);
 218
 219     if (s->next.le_prev) {
 220         QLIST_REMOVE(s, next);
 221     }
 222
 223     g_free((char *)s->sin.subtype);
 224 #if SPICE_SERVER_VERSION >= 0x000c02
 225     g_free((char *)s->sin.portname);
 226 #endif
 227 }
 228
 229 static void spice_vmc_set_fe_open(struct Chardev *chr, int fe_open)
 230 {
 231     SpiceChardev *s = SPICE_CHARDEV(chr);
 232     if (fe_open) {
 233         vmc_register_interface(s);
 234     } else {
 235         vmc_unregister_interface(s);
 236     }
 237 }
 238
 239 static void spice_port_set_fe_open(struct Chardev *chr, int fe_open)
 240 {
 241 #if SPICE_SERVER_VERSION >= 0x000c02
 242     SpiceChardev *s = SPICE_CHARDEV(chr);
 243
 244     if (fe_open) {
 245         spice_server_port_event(&s->sin, SPICE_PORT_EVENT_OPENED);
 246     } else {
 247         spice_server_port_event(&s->sin, SPICE_PORT_EVENT_CLOSED);
 248     }
 249 #endif
 250 }
 251
 252 static void spice_chr_accept_input(struct Chardev *chr)
 253 {
 254     SpiceChardev *s = SPICE_CHARDEV(chr);
 255
 256     spice_server_char_device_wakeup(&s->sin);
 257 }
 258
 259 static void chr_open(Chardev *chr, const char *subtype)
 260 {
 261     SpiceChardev *s = SPICE_CHARDEV(chr);
 262
 263     s->active = false;
 264     s->sin.subtype = g_strdup(subtype);
 265
 266     QLIST_INSERT_HEAD(&spice_chars, s, next);
 267 }
 268
 269 static void qemu_chr_open_spice_vmc(Chardev *chr,
 270                                     ChardevBackend *backend,
 271                                     bool *be_opened,
 272                                     Error **errp)
 273 {
 274     ChardevSpiceChannel *spicevmc = backend->u.spicevmc.data;
 275     const char *type = spicevmc->type;
 276     const char **psubtype = spice_server_char_device_recognized_subtypes();
 277
 278     for (; *psubtype != NULL; ++psubtype) {
 279         if (strcmp(type, *psubtype) == 0) {
 280             break;
 281         }
 282     }
 283     if (*psubtype == NULL) {
 284         char *subtypes = g_strjoinv(", ",
 285             (gchar **)spice_server_char_device_recognized_subtypes());
 286
 287         error_setg(errp, "unsupported type name: %s", type);
 288         error_append_hint(errp, "allowed spice char type names: %s\n",
 289                           subtypes);
 290
 291         g_free(subtypes);
 292         return;
 293     }
 294
 295     *be_opened = false;
 296     chr_open(chr, type);
 297 }
 298
 299 #if SPICE_SERVER_VERSION >= 0x000c02
 300 static void qemu_chr_open_spice_port(Chardev *chr,
 301                                      ChardevBackend *backend,
 302                                      bool *be_opened,
 303                                      Error **errp)
 304 {
 305     ChardevSpicePort *spiceport = backend->u.spiceport.data;
 306     const char *name = spiceport->fqdn;
 307     SpiceChardev *s;
 308
 309     if (name == NULL) {
 310         error_setg(errp, "missing name parameter");
 311         return;
 312     }
 313
 314     chr_open(chr, "port");
 315
 316     *be_opened = false;
 317     s = SPICE_CHARDEV(chr);
 318     s->sin.portname = g_strdup(name);
 319 }
 320
 321 void qemu_spice_register_ports(void)
 322 {
 323     SpiceChardev *s;
 324
 325     QLIST_FOREACH(s, &spice_chars, next) {
 326         if (s->sin.portname == NULL) {
 327             continue;
 328         }
 329         vmc_register_interface(s);
 330     }
 331 }
 332 #endif
 333
 334 static void qemu_chr_parse_spice_vmc(QemuOpts *opts, ChardevBackend *backend,
 335                                      Error **errp)
 336 {
 337     const char *name = qemu_opt_get(opts, "name");
 338     ChardevSpiceChannel *spicevmc;
 339
 340     if (name == NULL) {
 341         error_setg(errp, "chardev: spice channel: no name given");
 342         return;
 343     }
 344     backend->type = CHARDEV_BACKEND_KIND_SPICEVMC;
 345     spicevmc = backend->u.spicevmc.data = g_new0(ChardevSpiceChannel, 1);
 346     qemu_chr_parse_common(opts, qapi_ChardevSpiceChannel_base(spicevmc));
 347     spicevmc->type = g_strdup(name);
 348 }
 349
 350 static void qemu_chr_parse_spice_port(QemuOpts *opts, ChardevBackend *backend,
 351                                       Error **errp)
 352 {
 353     const char *name = qemu_opt_get(opts, "name");
 354     ChardevSpicePort *spiceport;
 355
 356     if (name == NULL) {
 357         error_setg(errp, "chardev: spice port: no name given");
 358         return;
 359     }
 360     backend->type = CHARDEV_BACKEND_KIND_SPICEPORT;
 361     spiceport = backend->u.spiceport.data = g_new0(ChardevSpicePort, 1);
 362     qemu_chr_parse_common(opts, qapi_ChardevSpicePort_base(spiceport));
 363     spiceport->fqdn = g_strdup(name);
 364 }
 365
 366 static void char_spice_class_init(ObjectClass *oc, void *data)
 367 {
 368     ChardevClass *cc = CHARDEV_CLASS(oc);
 369
 370     cc->chr_write = spice_chr_write;
 371     cc->chr_add_watch = spice_chr_add_watch;
 372     cc->chr_accept_input = spice_chr_accept_input;
 373 }
 374
 375 static const TypeInfo char_spice_type_info = {
 376     .name = TYPE_CHARDEV_SPICE,
 377     .parent = TYPE_CHARDEV,
 378     .instance_size = sizeof(SpiceChardev),
 379     .instance_finalize = char_spice_finalize,
 380     .class_init = char_spice_class_init,
 381     .abstract = true,
 382 };
 383
 384 static void char_spicevmc_class_init(ObjectClass *oc, void *data)
 385 {
 386     ChardevClass *cc = CHARDEV_CLASS(oc);
 387
 388     cc->parse = qemu_chr_parse_spice_vmc;
 389     cc->open = qemu_chr_open_spice_vmc;
 390     cc->chr_set_fe_open = spice_vmc_set_fe_open;
 391 }
 392
 393 static const TypeInfo char_spicevmc_type_info = {
 394     .name = TYPE_CHARDEV_SPICEVMC,
 395     .parent = TYPE_CHARDEV_SPICE,
 396     .class_init = char_spicevmc_class_init,
 397 };
 398
 399 static void char_spiceport_class_init(ObjectClass *oc, void *data)
 400 {
 401     ChardevClass *cc = CHARDEV_CLASS(oc);
 402
 403     cc->parse = qemu_chr_parse_spice_port;
 404     cc->open = qemu_chr_open_spice_port;
 405     cc->chr_set_fe_open = spice_port_set_fe_open;
 406 }
 407
 408 static const TypeInfo char_spiceport_type_info = {
 409     .name = TYPE_CHARDEV_SPICEPORT,
 410     .parent = TYPE_CHARDEV_SPICE,
 411     .class_init = char_spiceport_class_init,
 412 };
 413
 414 static void register_types(void)
 415 {
 416     type_register_static(&char_spice_type_info);
 417     type_register_static(&char_spicevmc_type_info);
 418     type_register_static(&char_spiceport_type_info);
 419 }
 420
 421 type_init(register_types);