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     char                  *subtype;
  15     bool                  active;
  16     bool                  blocked;
  17     const uint8_t         *datapos;
  18     int                   datalen;
  19     QLIST_ENTRY(SpiceCharDriver) next;
  20 } SpiceCharDriver;
  21
  22 typedef struct SpiceCharSource {
  23     GSource               source;
  24     SpiceCharDriver       *scd;
  25 } SpiceCharSource;
  26
  27 static QLIST_HEAD(, SpiceCharDriver) spice_chars =
  28     QLIST_HEAD_INITIALIZER(spice_chars);
  29
  30 static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
  31 {
  32     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  33     ssize_t out = 0;
  34     ssize_t last_out;
  35     uint8_t* p = (uint8_t*)buf;
  36
  37     while (len > 0) {
  38         int can_write = qemu_chr_be_can_write(scd->chr);
  39         last_out = MIN(len, can_write);
  40         if (last_out <= 0) {
  41             break;
  42         }
  43         qemu_chr_be_write(scd->chr, p, last_out);
  44         out += last_out;
  45         len -= last_out;
  46         p += last_out;
  47     }
  48
  49     trace_spice_vmc_write(out, len + out);
  50     return out;
  51 }
  52
  53 static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
  54 {
  55     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  56     int bytes = MIN(len, scd->datalen);
  57
  58     if (bytes > 0) {
  59         memcpy(buf, scd->datapos, bytes);
  60         scd->datapos += bytes;
  61         scd->datalen -= bytes;
  62         assert(scd->datalen >= 0);
  63     }
  64     if (scd->datalen == 0) {
  65         scd->datapos = 0;
  66         scd->blocked = false;
  67     }
  68     trace_spice_vmc_read(bytes, len);
  69     return bytes;
  70 }
  71
  72 #if SPICE_SERVER_VERSION >= 0x000c02
  73 static void vmc_event(SpiceCharDeviceInstance *sin, uint8_t event)
  74 {
  75     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  76     int chr_event;
  77
  78     switch (event) {
  79     case SPICE_PORT_EVENT_BREAK:
  80         chr_event = CHR_EVENT_BREAK;
  81         break;
  82     default:
  83         return;
  84     }
  85
  86     trace_spice_vmc_event(chr_event);
  87     qemu_chr_be_event(scd->chr, chr_event);
  88 }
  89 #endif
  90
  91 static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
  92 {
  93     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  94
  95     if ((scd->chr->be_open && connected) ||
  96         (!scd->chr->be_open && !connected)) {
  97         return;
  98     }
  99
 100     qemu_chr_be_event(scd->chr,
 101                       connected ? CHR_EVENT_OPENED : CHR_EVENT_CLOSED);
 102 }
 103
 104 static SpiceCharDeviceInterface vmc_interface = {
 105     .base.type          = SPICE_INTERFACE_CHAR_DEVICE,
 106     .base.description   = "spice virtual channel char device",
 107     .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
 108     .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
 109     .state              = vmc_state,
 110     .write              = vmc_write,
 111     .read               = vmc_read,
 112 #if SPICE_SERVER_VERSION >= 0x000c02
 113     .event              = vmc_event,
 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 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_chr_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 print_allowed_subtypes(void)
 227 {
 228     const char** psubtype;
 229     int i;
 230
 231     fprintf(stderr, "allowed names: ");
 232     for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
 233         *psubtype != NULL; ++psubtype, ++i) {
 234         if (i == 0) {
 235             fprintf(stderr, "%s", *psubtype);
 236         } else {
 237             fprintf(stderr, ", %s", *psubtype);
 238         }
 239     }
 240     fprintf(stderr, "\n");
 241 }
 242
 243 static CharDriverState *chr_open(const char *subtype)
 244 {
 245     CharDriverState *chr;
 246     SpiceCharDriver *s;
 247
 248     chr = g_malloc0(sizeof(CharDriverState));
 249     s = g_malloc0(sizeof(SpiceCharDriver));
 250     s->chr = chr;
 251     s->active = false;
 252     s->sin.subtype = g_strdup(subtype);
 253     chr->opaque = s;
 254     chr->chr_write = spice_chr_write;
 255     chr->chr_add_watch = spice_chr_add_watch;
 256     chr->chr_close = spice_chr_close;
 257     chr->chr_set_fe_open = spice_chr_set_fe_open;
 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);