spice-qemu-char.c

   1 #include "config-host.h"
   2 #include "trace.h"
   3 #include "ui/qemu-spice.h"
   4 #include "qemu-char.h"
   5 #include <spice.h>
   6 #include <spice-experimental.h>
   7
   8 #include "qemu/osdep.h"
   9
  10 #define dprintf(_scd, _level, _fmt, ...)                                \
  11     do {                                                                \
  12         static unsigned __dprintf_counter = 0;                          \
  13         if (_scd->debug >= _level) {                                    \
  14             fprintf(stderr, "scd: %3d: " _fmt, ++__dprintf_counter, ## __VA_ARGS__);\
  15         }                                                               \
  16     } while (0)
  17
  18 #define VMC_MAX_HOST_WRITE    2048
  19
  20 typedef struct SpiceCharDriver {
  21     CharDriverState*      chr;
  22     SpiceCharDeviceInstance     sin;
  23     char                  *subtype;
  24     bool                  active;
  25     uint8_t               *buffer;
  26     uint8_t               *datapos;
  27     ssize_t               bufsize, datalen;
  28     uint32_t              debug;
  29 } SpiceCharDriver;
  30
  31 static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
  32 {
  33     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  34     ssize_t out = 0;
  35     ssize_t last_out;
  36     uint8_t* p = (uint8_t*)buf;
  37
  38     while (len > 0) {
  39         last_out = MIN(len, VMC_MAX_HOST_WRITE);
  40         if (qemu_chr_be_can_write(scd->chr) < last_out) {
  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     dprintf(scd, 3, "%s: %zu/%zd\n", __func__, out, len + out);
  50     trace_spice_vmc_write(out, len + out);
  51     return out;
  52 }
  53
  54 static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
  55 {
  56     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  57     int bytes = MIN(len, scd->datalen);
  58
  59     dprintf(scd, 2, "%s: %p %d/%d/%zd\n", __func__, scd->datapos, len, bytes, scd->datalen);
  60     if (bytes > 0) {
  61         memcpy(buf, scd->datapos, bytes);
  62         scd->datapos += bytes;
  63         scd->datalen -= bytes;
  64         assert(scd->datalen >= 0);
  65         if (scd->datalen == 0) {
  66             scd->datapos = 0;
  67         }
  68     }
  69     trace_spice_vmc_read(bytes, len);
  70     return bytes;
  71 }
  72
  73 static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
  74 {
  75     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  76
  77 #if SPICE_SERVER_VERSION < 0x000901
  78     /*
  79      * spice-server calls the state callback for the agent channel when the
  80      * spice client connects / disconnects. Given that not the client but
  81      * the server is doing the parsing of the messages this is wrong as the
  82      * server is still listening. Worse, this causes the parser in the server
  83      * to go out of sync, so we ignore state calls for subtype vdagent
  84      * spicevmc chardevs. For the full story see:
  85      * http://lists.freedesktop.org/archives/spice-devel/2011-July/004837.html
  86      */
  87     if (strcmp(sin->subtype, "vdagent") == 0) {
  88         return;
  89     }
  90 #endif
  91
  92     if ((scd->chr->opened && connected) ||
  93         (!scd->chr->opened && !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 };
 110
 111
 112 static void vmc_register_interface(SpiceCharDriver *scd)
 113 {
 114     if (scd->active) {
 115         return;
 116     }
 117     dprintf(scd, 1, "%s\n", __func__);
 118     scd->sin.base.sif = &vmc_interface.base;
 119     qemu_spice_add_interface(&scd->sin.base);
 120     scd->active = true;
 121     trace_spice_vmc_register_interface(scd);
 122 }
 123
 124 static void vmc_unregister_interface(SpiceCharDriver *scd)
 125 {
 126     if (!scd->active) {
 127         return;
 128     }
 129     dprintf(scd, 1, "%s\n", __func__);
 130     spice_server_remove_interface(&scd->sin.base);
 131     scd->active = false;
 132     trace_spice_vmc_unregister_interface(scd);
 133 }
 134
 135
 136 static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
 137 {
 138     SpiceCharDriver *s = chr->opaque;
 139
 140     dprintf(s, 2, "%s: %d\n", __func__, len);
 141     vmc_register_interface(s);
 142     assert(s->datalen == 0);
 143     if (s->bufsize < len) {
 144         s->bufsize = len;
 145         s->buffer = g_realloc(s->buffer, s->bufsize);
 146     }
 147     memcpy(s->buffer, buf, len);
 148     s->datapos = s->buffer;
 149     s->datalen = len;
 150     spice_server_char_device_wakeup(&s->sin);
 151     return len;
 152 }
 153
 154 static void spice_chr_close(struct CharDriverState *chr)
 155 {
 156     SpiceCharDriver *s = chr->opaque;
 157
 158     printf("%s\n", __func__);
 159     vmc_unregister_interface(s);
 160     g_free(s);
 161 }
 162
 163 static void spice_chr_guest_open(struct CharDriverState *chr)
 164 {
 165     SpiceCharDriver *s = chr->opaque;
 166     vmc_register_interface(s);
 167 }
 168
 169 static void spice_chr_guest_close(struct CharDriverState *chr)
 170 {
 171     SpiceCharDriver *s = chr->opaque;
 172     vmc_unregister_interface(s);
 173 }
 174
 175 static void print_allowed_subtypes(void)
 176 {
 177     const char** psubtype;
 178     int i;
 179
 180     fprintf(stderr, "allowed names: ");
 181     for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
 182         *psubtype != NULL; ++psubtype, ++i) {
 183         if (i == 0) {
 184             fprintf(stderr, "%s", *psubtype);
 185         } else {
 186             fprintf(stderr, ", %s", *psubtype);
 187         }
 188     }
 189     fprintf(stderr, "\n");
 190 }
 191
 192 CharDriverState *qemu_chr_open_spice(QemuOpts *opts)
 193 {
 194     CharDriverState *chr;
 195     SpiceCharDriver *s;
 196     const char* name = qemu_opt_get(opts, "name");
 197     uint32_t debug = qemu_opt_get_number(opts, "debug", 0);
 198     const char** psubtype = spice_server_char_device_recognized_subtypes();
 199     const char *subtype = NULL;
 200
 201     if (name == NULL) {
 202         fprintf(stderr, "spice-qemu-char: missing name parameter\n");
 203         print_allowed_subtypes();
 204         return NULL;
 205     }
 206     for(;*psubtype != NULL; ++psubtype) {
 207         if (strcmp(name, *psubtype) == 0) {
 208             subtype = *psubtype;
 209             break;
 210         }
 211     }
 212     if (subtype == NULL) {
 213         fprintf(stderr, "spice-qemu-char: unsupported name: %s\n", name);
 214         print_allowed_subtypes();
 215         return NULL;
 216     }
 217
 218     chr = g_malloc0(sizeof(CharDriverState));
 219     s = g_malloc0(sizeof(SpiceCharDriver));
 220     s->chr = chr;
 221     s->debug = debug;
 222     s->active = false;
 223     s->sin.subtype = subtype;
 224     chr->opaque = s;
 225     chr->chr_write = spice_chr_write;
 226     chr->chr_close = spice_chr_close;
 227     chr->chr_guest_open = spice_chr_guest_open;
 228     chr->chr_guest_close = spice_chr_guest_close;
 229
 230 #if SPICE_SERVER_VERSION < 0x000901
 231     /* See comment in vmc_state() */
 232     if (strcmp(subtype, "vdagent") == 0) {
 233         qemu_chr_generic_open(chr);
 234     }
 235 #endif
 236
 237     return chr;
 238 }