summaryrefslogtreecommitdiffstats
path: root/spice-qemu-char.c
blob: 7e0d300777be71883f5264ec73cf16afa7550ebf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
#include "config-host.h"
#include "trace.h"
#include "ui/qemu-spice.h"
#include "sysemu/char.h"
#include <spice.h>
#include <spice/protocol.h>

#include "qemu/osdep.h"

typedef struct SpiceCharDriver {
    CharDriverState*      chr;
    SpiceCharDeviceInstance     sin;
    bool                  active;
    bool                  blocked;
    const uint8_t         *datapos;
    int                   datalen;
    QLIST_ENTRY(SpiceCharDriver) next;
} SpiceCharDriver;

typedef struct SpiceCharSource {
    GSource               source;
    SpiceCharDriver       *scd;
} SpiceCharSource;

static QLIST_HEAD(, SpiceCharDriver) spice_chars =
    QLIST_HEAD_INITIALIZER(spice_chars);

static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
{
    SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
    ssize_t out = 0;
    ssize_t last_out;
    uint8_t* p = (uint8_t*)buf;

    while (len > 0) {
        int can_write = qemu_chr_be_can_write(scd->chr);
        last_out = MIN(len, can_write);
        if (last_out <= 0) {
            break;
        }
        qemu_chr_be_write(scd->chr, p, last_out);
        out += last_out;
        len -= last_out;
        p += last_out;
    }

    trace_spice_vmc_write(out, len + out);
    return out;
}

static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
{
    SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
    int bytes = MIN(len, scd->datalen);

    if (bytes > 0) {
        memcpy(buf, scd->datapos, bytes);
        scd->datapos += bytes;
        scd->datalen -= bytes;
        assert(scd->datalen >= 0);
    }
    if (scd->datalen == 0) {
        scd->datapos = 0;
        scd->blocked = false;
    }
    trace_spice_vmc_read(bytes, len);
    return bytes;
}

#if SPICE_SERVER_VERSION >= 0x000c02
static void vmc_event(SpiceCharDeviceInstance *sin, uint8_t event)
{
    SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
    int chr_event;

    switch (event) {
    case SPICE_PORT_EVENT_BREAK:
        chr_event = CHR_EVENT_BREAK;
        break;
    default:
        return;
    }

    trace_spice_vmc_event(chr_event);
    qemu_chr_be_event(scd->chr, chr_event);
}
#endif

static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
{
    SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);

    if ((scd->chr->be_open && connected) ||
        (!scd->chr->be_open && !connected)) {
        return;
    }

    qemu_chr_be_event(scd->chr,
                      connected ? CHR_EVENT_OPENED : CHR_EVENT_CLOSED);
}

static SpiceCharDeviceInterface vmc_interface = {
    .base.type          = SPICE_INTERFACE_CHAR_DEVICE,
    .base.description   = "spice virtual channel char device",
    .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
    .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
    .state              = vmc_state,
    .write              = vmc_write,
    .read               = vmc_read,
#if SPICE_SERVER_VERSION >= 0x000c02
    .event              = vmc_event,
#endif
};


static void vmc_register_interface(SpiceCharDriver *scd)
{
    if (scd->active) {
        return;
    }
    scd->sin.base.sif = &vmc_interface.base;
    qemu_spice_add_interface(&scd->sin.base);
    scd->active = true;
    trace_spice_vmc_register_interface(scd);
}

static void vmc_unregister_interface(SpiceCharDriver *scd)
{
    if (!scd->active) {
        return;
    }
    spice_server_remove_interface(&scd->sin.base);
    scd->active = false;
    trace_spice_vmc_unregister_interface(scd);
}

static gboolean spice_char_source_prepare(GSource *source, gint *timeout)
{
    SpiceCharSource *src = (SpiceCharSource *)source;

    *timeout = -1;

    return !src->scd->blocked;
}

static gboolean spice_char_source_check(GSource *source)
{
    SpiceCharSource *src = (SpiceCharSource *)source;

    return !src->scd->blocked;
}

static gboolean spice_char_source_dispatch(GSource *source,
    GSourceFunc callback, gpointer user_data)
{
    GIOFunc func = (GIOFunc)callback;

    return func(NULL, G_IO_OUT, user_data);
}

GSourceFuncs SpiceCharSourceFuncs = {
    .prepare  = spice_char_source_prepare,
    .check    = spice_char_source_check,
    .dispatch = spice_char_source_dispatch,
};

static GSource *spice_chr_add_watch(CharDriverState *chr, GIOCondition cond)
{
    SpiceCharDriver *scd = chr->opaque;
    SpiceCharSource *src;

    assert(cond == G_IO_OUT);

    src = (SpiceCharSource *)g_source_new(&SpiceCharSourceFuncs,
                                          sizeof(SpiceCharSource));
    src->scd = scd;

    return (GSource *)src;
}

static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
{
    SpiceCharDriver *s = chr->opaque;
    int read_bytes;

    assert(s->datalen == 0);
    s->datapos = buf;
    s->datalen = len;
    spice_server_char_device_wakeup(&s->sin);
    read_bytes = len - s->datalen;
    if (read_bytes != len) {
        /* We'll get passed in the unconsumed data with the next call */
        s->datalen = 0;
        s->datapos = NULL;
        s->blocked = true;
    }
    return read_bytes;
}

static void spice_chr_close(struct CharDriverState *chr)
{
    SpiceCharDriver *s = chr->opaque;

    vmc_unregister_interface(s);
    QLIST_REMOVE(s, next);

    g_free((char *)s->sin.subtype);
#if SPICE_SERVER_VERSION >= 0x000c02
    g_free((char *)s->sin.portname);
#endif
    g_free(s);
}

static void spice_vmc_set_fe_open(struct CharDriverState *chr, int fe_open)
{
    SpiceCharDriver *s = chr->opaque;
    if (fe_open) {
        vmc_register_interface(s);
    } else {
        vmc_unregister_interface(s);
    }
}

static void spice_port_set_fe_open(struct CharDriverState *chr, int fe_open)
{
#if SPICE_SERVER_VERSION >= 0x000c02
    SpiceCharDriver *s = chr->opaque;

    if (fe_open) {
        spice_server_port_event(&s->sin, SPICE_PORT_EVENT_OPENED);
    } else {
        spice_server_port_event(&s->sin, SPICE_PORT_EVENT_CLOSED);
    }
#endif
}

static void spice_chr_fe_event(struct CharDriverState *chr, int event)
{
#if SPICE_SERVER_VERSION >= 0x000c02
    SpiceCharDriver *s = chr->opaque;

    spice_server_port_event(&s->sin, event);
#endif
}

static void print_allowed_subtypes(void)
{
    const char** psubtype;
    int i;

    fprintf(stderr, "allowed names: ");
    for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
        *psubtype != NULL; ++psubtype, ++i) {
        if (i == 0) {
            fprintf(stderr, "%s", *psubtype);
        } else {
            fprintf(stderr, ", %s", *psubtype);
        }
    }
    fprintf(stderr, "\n");
}

static CharDriverState *chr_open(const char *subtype,
    void (*set_fe_open)(struct CharDriverState *, int))

{
    CharDriverState *chr;
    SpiceCharDriver *s;

    chr = qemu_chr_alloc();
    s = g_malloc0(sizeof(SpiceCharDriver));
    s->chr = chr;
    s->active = false;
    s->sin.subtype = g_strdup(subtype);
    chr->opaque = s;
    chr->chr_write = spice_chr_write;
    chr->chr_add_watch = spice_chr_add_watch;
    chr->chr_close = spice_chr_close;
    chr->chr_set_fe_open = set_fe_open;
    chr->explicit_be_open = true;
    chr->chr_fe_event = spice_chr_fe_event;

    QLIST_INSERT_HEAD(&spice_chars, s, next);

    return chr;
}

CharDriverState *qemu_chr_open_spice_vmc(const char *type)
{
    const char **psubtype = spice_server_char_device_recognized_subtypes();

    if (type == NULL) {
        fprintf(stderr, "spice-qemu-char: missing name parameter\n");
        print_allowed_subtypes();
        return NULL;
    }
    for (; *psubtype != NULL; ++psubtype) {
        if (strcmp(type, *psubtype) == 0) {
            break;
        }
    }
    if (*psubtype == NULL) {
        fprintf(stderr, "spice-qemu-char: unsupported type: %s\n", type);
        print_allowed_subtypes();
        return NULL;
    }

    return chr_open(type, spice_vmc_set_fe_open);
}

#if SPICE_SERVER_VERSION >= 0x000c02
CharDriverState *qemu_chr_open_spice_port(const char *name)
{
    CharDriverState *chr;
    SpiceCharDriver *s;

    if (name == NULL) {
        fprintf(stderr, "spice-qemu-char: missing name parameter\n");
        return NULL;
    }

    chr = chr_open("port", spice_port_set_fe_open);
    s = chr->opaque;
    s->sin.portname = g_strdup(name);

    return chr;
}

void qemu_spice_register_ports(void)
{
    SpiceCharDriver *s;

    QLIST_FOREACH(s, &spice_chars, next) {
        if (s->sin.portname == NULL) {
            continue;
        }
        vmc_register_interface(s);
    }
}
#endif

static void qemu_chr_parse_spice_vmc(QemuOpts *opts, ChardevBackend *backend,
                                     Error **errp)
{
    const char *name = qemu_opt_get(opts, "name");

    if (name == NULL) {
        error_setg(errp, "chardev: spice channel: no name given");
        return;
    }
    backend->spicevmc = g_new0(ChardevSpiceChannel, 1);
    backend->spicevmc->type = g_strdup(name);
}

static void qemu_chr_parse_spice_port(QemuOpts *opts, ChardevBackend *backend,
                                      Error **errp)
{
    const char *name = qemu_opt_get(opts, "name");

    if (name == NULL) {
        error_setg(errp, "chardev: spice port: no name given");
        return;
    }
    backend->spiceport = g_new0(ChardevSpicePort, 1);
    backend->spiceport->fqdn = g_strdup(name);
}

static void register_types(void)
{
    register_char_driver("spicevmc", CHARDEV_BACKEND_KIND_SPICEVMC,
                         qemu_chr_parse_spice_vmc);
    register_char_driver("spiceport", CHARDEV_BACKEND_KIND_SPICEPORT,
                         qemu_chr_parse_spice_port);
}

type_init(register_types);
OpenPOWER on IntegriCloud