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