spice-qemu-char.c

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