spice-qemu-char.c

   1 #include "qemu/osdep.h"
   2 #include "trace.h"
   3 #include "ui/qemu-spice.h"
   4 #include "sysemu/char.h"
   5 #include <spice.h>
   6 #include <spice/protocol.h>
   7
   8
   9 typedef struct SpiceCharDriver {
  10     CharDriverState*      chr;
  11     SpiceCharDeviceInstance     sin;
  12     bool                  active;
  13     bool                  blocked;
  14     const uint8_t         *datapos;
  15     int                   datalen;
  16     QLIST_ENTRY(SpiceCharDriver) next;
  17 } SpiceCharDriver;
  18
  19 typedef struct SpiceCharSource {
  20     GSource               source;
  21     SpiceCharDriver       *scd;
  22 } SpiceCharSource;
  23
  24 static QLIST_HEAD(, SpiceCharDriver) spice_chars =
  25     QLIST_HEAD_INITIALIZER(spice_chars);
  26
  27 static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
  28 {
  29     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  30     ssize_t out = 0;
  31     ssize_t last_out;
  32     uint8_t* p = (uint8_t*)buf;
  33
  34     while (len > 0) {
  35         int can_write = qemu_chr_be_can_write(scd->chr);
  36         last_out = MIN(len, can_write);
  37         if (last_out <= 0) {
  38             break;
  39         }
  40         qemu_chr_be_write(scd->chr, p, last_out);
  41         out += last_out;
  42         len -= last_out;
  43         p += last_out;
  44     }
  45
  46     trace_spice_vmc_write(out, len + out);
  47     return out;
  48 }
  49
  50 static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
  51 {
  52     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  53     int bytes = MIN(len, scd->datalen);
  54
  55     if (bytes > 0) {
  56         memcpy(buf, scd->datapos, bytes);
  57         scd->datapos += bytes;
  58         scd->datalen -= bytes;
  59         assert(scd->datalen >= 0);
  60     }
  61     if (scd->datalen == 0) {
  62         scd->datapos = 0;
  63         scd->blocked = false;
  64     }
  65     trace_spice_vmc_read(bytes, len);
  66     return bytes;
  67 }
  68
  69 #if SPICE_SERVER_VERSION >= 0x000c02
  70 static void vmc_event(SpiceCharDeviceInstance *sin, uint8_t event)
  71 {
  72     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  73     int chr_event;
  74
  75     switch (event) {
  76     case SPICE_PORT_EVENT_BREAK:
  77         chr_event = CHR_EVENT_BREAK;
  78         break;
  79     default:
  80         return;
  81     }
  82
  83     trace_spice_vmc_event(chr_event);
  84     qemu_chr_be_event(scd->chr, chr_event);
  85 }
  86 #endif
  87
  88 static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
  89 {
  90     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  91
  92     if ((scd->chr->be_open && connected) ||
  93         (!scd->chr->be_open && !connected)) {
  94         return;
  95     }
  96
  97     qemu_chr_be_event(scd->chr,
  98                       connected ? CHR_EVENT_OPENED : CHR_EVENT_CLOSED);
  99 }
 100
 101 static SpiceCharDeviceInterface vmc_interface = {
 102     .base.type          = SPICE_INTERFACE_CHAR_DEVICE,
 103     .base.description   = "spice virtual channel char device",
 104     .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
 105     .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
 106     .state              = vmc_state,
 107     .write              = vmc_write,
 108     .read               = vmc_read,
 109 #if SPICE_SERVER_VERSION >= 0x000c02
 110     .event              = vmc_event,
 111 #endif
 112 #if SPICE_SERVER_VERSION >= 0x000c06
 113     .flags              = SPICE_CHAR_DEVICE_NOTIFY_WRITABLE,
 114 #endif
 115 };
 116
 117
 118 static void vmc_register_interface(SpiceCharDriver *scd)
 119 {
 120     if (scd->active) {
 121         return;
 122     }
 123     scd->sin.base.sif = &vmc_interface.base;
 124     qemu_spice_add_interface(&scd->sin.base);
 125     scd->active = true;
 126     trace_spice_vmc_register_interface(scd);
 127 }
 128
 129 static void vmc_unregister_interface(SpiceCharDriver *scd)
 130 {
 131     if (!scd->active) {
 132         return;
 133     }
 134     spice_server_remove_interface(&scd->sin.base);
 135     scd->active = false;
 136     trace_spice_vmc_unregister_interface(scd);
 137 }
 138
 139 static gboolean spice_char_source_prepare(GSource *source, gint *timeout)
 140 {
 141     SpiceCharSource *src = (SpiceCharSource *)source;
 142
 143     *timeout = -1;
 144
 145     return !src->scd->blocked;
 146 }
 147
 148 static gboolean spice_char_source_check(GSource *source)
 149 {
 150     SpiceCharSource *src = (SpiceCharSource *)source;
 151
 152     return !src->scd->blocked;
 153 }
 154
 155 static gboolean spice_char_source_dispatch(GSource *source,
 156     GSourceFunc callback, gpointer user_data)
 157 {
 158     GIOFunc func = (GIOFunc)callback;
 159
 160     return func(NULL, G_IO_OUT, user_data);
 161 }
 162
 163 static GSourceFuncs SpiceCharSourceFuncs = {
 164     .prepare  = spice_char_source_prepare,
 165     .check    = spice_char_source_check,
 166     .dispatch = spice_char_source_dispatch,
 167 };
 168
 169 static GSource *spice_chr_add_watch(CharDriverState *chr, GIOCondition cond)
 170 {
 171     SpiceCharDriver *scd = chr->opaque;
 172     SpiceCharSource *src;
 173
 174     assert(cond & G_IO_OUT);
 175
 176     src = (SpiceCharSource *)g_source_new(&SpiceCharSourceFuncs,
 177                                           sizeof(SpiceCharSource));
 178     src->scd = scd;
 179
 180     return (GSource *)src;
 181 }
 182
 183 static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
 184 {
 185     SpiceCharDriver *s = chr->opaque;
 186     int read_bytes;
 187
 188     assert(s->datalen == 0);
 189     s->datapos = buf;
 190     s->datalen = len;
 191     spice_server_char_device_wakeup(&s->sin);
 192     read_bytes = len - s->datalen;
 193     if (read_bytes != len) {
 194         /* We'll get passed in the unconsumed data with the next call */
 195         s->datalen = 0;
 196         s->datapos = NULL;
 197         s->blocked = true;
 198     }
 199     return read_bytes;
 200 }
 201
 202 static void spice_chr_close(struct CharDriverState *chr)
 203 {
 204     SpiceCharDriver *s = chr->opaque;
 205
 206     vmc_unregister_interface(s);
 207     QLIST_REMOVE(s, next);
 208
 209     g_free((char *)s->sin.subtype);
 210 #if SPICE_SERVER_VERSION >= 0x000c02
 211     g_free((char *)s->sin.portname);
 212 #endif
 213     g_free(s);
 214 }
 215
 216 static void spice_vmc_set_fe_open(struct CharDriverState *chr, int fe_open)
 217 {
 218     SpiceCharDriver *s = chr->opaque;
 219     if (fe_open) {
 220         vmc_register_interface(s);
 221     } else {
 222         vmc_unregister_interface(s);
 223     }
 224 }
 225
 226 static void spice_port_set_fe_open(struct CharDriverState *chr, int fe_open)
 227 {
 228 #if SPICE_SERVER_VERSION >= 0x000c02
 229     SpiceCharDriver *s = chr->opaque;
 230
 231     if (fe_open) {
 232         spice_server_port_event(&s->sin, SPICE_PORT_EVENT_OPENED);
 233     } else {
 234         spice_server_port_event(&s->sin, SPICE_PORT_EVENT_CLOSED);
 235     }
 236 #endif
 237 }
 238
 239 static void spice_chr_fe_event(struct CharDriverState *chr, int event)
 240 {
 241 #if SPICE_SERVER_VERSION >= 0x000c02
 242     SpiceCharDriver *s = chr->opaque;
 243
 244     spice_server_port_event(&s->sin, event);
 245 #endif
 246 }
 247
 248 static void print_allowed_subtypes(void)
 249 {
 250     const char** psubtype;
 251     int i;
 252
 253     fprintf(stderr, "allowed names: ");
 254     for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
 255         *psubtype != NULL; ++psubtype, ++i) {
 256         if (i == 0) {
 257             fprintf(stderr, "%s", *psubtype);
 258         } else {
 259             fprintf(stderr, ", %s", *psubtype);
 260         }
 261     }
 262     fprintf(stderr, "\n");
 263 }
 264
 265 static void spice_chr_accept_input(struct CharDriverState *chr)
 266 {
 267     SpiceCharDriver *s = chr->opaque;
 268
 269     spice_server_char_device_wakeup(&s->sin);
 270 }
 271
 272 static CharDriverState *chr_open(const char *subtype,
 273                                  void (*set_fe_open)(struct CharDriverState *,
 274                                                      int),
 275                                  ChardevCommon *backend,
 276                                  Error **errp)
 277 {
 278     CharDriverState *chr;
 279     SpiceCharDriver *s;
 280
 281     chr = qemu_chr_alloc(backend, errp);
 282     if (!chr) {
 283         return NULL;
 284     }
 285     s = g_malloc0(sizeof(SpiceCharDriver));
 286     s->chr = chr;
 287     s->active = false;
 288     s->sin.subtype = g_strdup(subtype);
 289     chr->opaque = s;
 290     chr->chr_write = spice_chr_write;
 291     chr->chr_add_watch = spice_chr_add_watch;
 292     chr->chr_close = spice_chr_close;
 293     chr->chr_set_fe_open = set_fe_open;
 294     chr->explicit_be_open = true;
 295     chr->chr_fe_event = spice_chr_fe_event;
 296     chr->chr_accept_input = spice_chr_accept_input;
 297
 298     QLIST_INSERT_HEAD(&spice_chars, s, next);
 299
 300     return chr;
 301 }
 302
 303 static CharDriverState *qemu_chr_open_spice_vmc(const char *id,
 304                                                 ChardevBackend *backend,
 305                                                 ChardevReturn *ret,
 306                                                 Error **errp)
 307 {
 308     ChardevSpiceChannel *spicevmc = backend->u.spicevmc.data;
 309     const char *type = spicevmc->type;
 310     const char **psubtype = spice_server_char_device_recognized_subtypes();
 311     ChardevCommon *common = qapi_ChardevSpiceChannel_base(spicevmc);
 312
 313     for (; *psubtype != NULL; ++psubtype) {
 314         if (strcmp(type, *psubtype) == 0) {
 315             break;
 316         }
 317     }
 318     if (*psubtype == NULL) {
 319         fprintf(stderr, "spice-qemu-char: unsupported type: %s\n", type);
 320         print_allowed_subtypes();
 321         return NULL;
 322     }
 323
 324     return chr_open(type, spice_vmc_set_fe_open, common, errp);
 325 }
 326
 327 #if SPICE_SERVER_VERSION >= 0x000c02
 328 static CharDriverState *qemu_chr_open_spice_port(const char *id,
 329                                                  ChardevBackend *backend,
 330                                                  ChardevReturn *ret,
 331                                                  Error **errp)
 332 {
 333     ChardevSpicePort *spiceport = backend->u.spiceport.data;
 334     const char *name = spiceport->fqdn;
 335     ChardevCommon *common = qapi_ChardevSpicePort_base(spiceport);
 336     CharDriverState *chr;
 337     SpiceCharDriver *s;
 338
 339     if (name == NULL) {
 340         fprintf(stderr, "spice-qemu-char: missing name parameter\n");
 341         return NULL;
 342     }
 343
 344     chr = chr_open("port", spice_port_set_fe_open, common, errp);
 345     if (!chr) {
 346         return NULL;
 347     }
 348     s = chr->opaque;
 349     s->sin.portname = g_strdup(name);
 350
 351     return chr;
 352 }
 353
 354 void qemu_spice_register_ports(void)
 355 {
 356     SpiceCharDriver *s;
 357
 358     QLIST_FOREACH(s, &spice_chars, next) {
 359         if (s->sin.portname == NULL) {
 360             continue;
 361         }
 362         vmc_register_interface(s);
 363     }
 364 }
 365 #endif
 366
 367 static void qemu_chr_parse_spice_vmc(QemuOpts *opts, ChardevBackend *backend,
 368                                      Error **errp)
 369 {
 370     const char *name = qemu_opt_get(opts, "name");
 371     ChardevSpiceChannel *spicevmc;
 372
 373     if (name == NULL) {
 374         error_setg(errp, "chardev: spice channel: no name given");
 375         return;
 376     }
 377     spicevmc = backend->u.spicevmc.data = g_new0(ChardevSpiceChannel, 1);
 378     qemu_chr_parse_common(opts, qapi_ChardevSpiceChannel_base(spicevmc));
 379     spicevmc->type = g_strdup(name);
 380 }
 381
 382 static void qemu_chr_parse_spice_port(QemuOpts *opts, ChardevBackend *backend,
 383                                       Error **errp)
 384 {
 385     const char *name = qemu_opt_get(opts, "name");
 386     ChardevSpicePort *spiceport;
 387
 388     if (name == NULL) {
 389         error_setg(errp, "chardev: spice port: no name given");
 390         return;
 391     }
 392     spiceport = backend->u.spiceport.data = g_new0(ChardevSpicePort, 1);
 393     qemu_chr_parse_common(opts, qapi_ChardevSpicePort_base(spiceport));
 394     spiceport->fqdn = g_strdup(name);
 395 }
 396
 397 static void register_types(void)
 398 {
 399     register_char_driver("spicevmc", CHARDEV_BACKEND_KIND_SPICEVMC,
 400                          qemu_chr_parse_spice_vmc, qemu_chr_open_spice_vmc);
 401     register_char_driver("spiceport", CHARDEV_BACKEND_KIND_SPICEPORT,
 402                          qemu_chr_parse_spice_port, qemu_chr_open_spice_port);
 403 }
 404
 405 type_init(register_types);