quorum: Avoid bdrv_aio_writev() for rewrites
[qemu.git] / spice-qemu-char.c
1 #include "qemu/osdep.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
9 typedef struct SpiceCharDriver {
10 CharDriverState* chr;
11 SpiceCharDeviceInstance sin;
12 bool active;
13 bool blocked;
14 const uint8_t *datapos;
15 int datalen;
16 QLIST_ENTRY(SpiceCharDriver) next;
17 } SpiceCharDriver;
18
19 typedef struct SpiceCharSource {
20 GSource source;
21 SpiceCharDriver *scd;
22 } SpiceCharSource;
23
24 static QLIST_HEAD(, SpiceCharDriver) spice_chars =
25 QLIST_HEAD_INITIALIZER(spice_chars);
26
27 static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
28 {
29 SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
30 ssize_t out = 0;
31 ssize_t last_out;
32 uint8_t* p = (uint8_t*)buf;
33
34 while (len > 0) {
35 int can_write = qemu_chr_be_can_write(scd->chr);
36 last_out = MIN(len, can_write);
37 if (last_out <= 0) {
38 break;
39 }
40 qemu_chr_be_write(scd->chr, p, last_out);
41 out += last_out;
42 len -= last_out;
43 p += last_out;
44 }
45
46 trace_spice_vmc_write(out, len + out);
47 return out;
48 }
49
50 static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
51 {
52 SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
53 int bytes = MIN(len, scd->datalen);
54
55 if (bytes > 0) {
56 memcpy(buf, scd->datapos, bytes);
57 scd->datapos += bytes;
58 scd->datalen -= bytes;
59 assert(scd->datalen >= 0);
60 }
61 if (scd->datalen == 0) {
62 scd->datapos = 0;
63 scd->blocked = false;
64 }
65 trace_spice_vmc_read(bytes, len);
66 return bytes;
67 }
68
69 #if SPICE_SERVER_VERSION >= 0x000c02
70 static void vmc_event(SpiceCharDeviceInstance *sin, uint8_t event)
71 {
72 SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
73 int chr_event;
74
75 switch (event) {
76 case SPICE_PORT_EVENT_BREAK:
77 chr_event = CHR_EVENT_BREAK;
78 break;
79 default:
80 return;
81 }
82
83 trace_spice_vmc_event(chr_event);
84 qemu_chr_be_event(scd->chr, chr_event);
85 }
86 #endif
87
88 static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
89 {
90 SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
91
92 if ((scd->chr->be_open && connected) ||
93 (!scd->chr->be_open && !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 #if SPICE_SERVER_VERSION >= 0x000c02
110 .event = vmc_event,
111 #endif
112 #if SPICE_SERVER_VERSION >= 0x000c06
113 .flags = SPICE_CHAR_DEVICE_NOTIFY_WRITABLE,
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 static 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_free(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_vmc_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 spice_port_set_fe_open(struct CharDriverState *chr, int fe_open)
227 {
228 #if SPICE_SERVER_VERSION >= 0x000c02
229 SpiceCharDriver *s = chr->opaque;
230
231 if (fe_open) {
232 spice_server_port_event(&s->sin, SPICE_PORT_EVENT_OPENED);
233 } else {
234 spice_server_port_event(&s->sin, SPICE_PORT_EVENT_CLOSED);
235 }
236 #endif
237 }
238
239 static void print_allowed_subtypes(void)
240 {
241 const char** psubtype;
242 int i;
243
244 fprintf(stderr, "allowed names: ");
245 for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
246 *psubtype != NULL; ++psubtype, ++i) {
247 if (i == 0) {
248 fprintf(stderr, "%s", *psubtype);
249 } else {
250 fprintf(stderr, ", %s", *psubtype);
251 }
252 }
253 fprintf(stderr, "\n");
254 }
255
256 static void spice_chr_accept_input(struct CharDriverState *chr)
257 {
258 SpiceCharDriver *s = chr->opaque;
259
260 spice_server_char_device_wakeup(&s->sin);
261 }
262
263 static CharDriverState *chr_open(const char *subtype,
264 void (*set_fe_open)(struct CharDriverState *,
265 int),
266 ChardevCommon *backend,
267 Error **errp)
268 {
269 CharDriverState *chr;
270 SpiceCharDriver *s;
271
272 chr = qemu_chr_alloc(backend, errp);
273 if (!chr) {
274 return NULL;
275 }
276 s = g_malloc0(sizeof(SpiceCharDriver));
277 s->chr = chr;
278 s->active = false;
279 s->sin.subtype = g_strdup(subtype);
280 chr->opaque = s;
281 chr->chr_write = spice_chr_write;
282 chr->chr_add_watch = spice_chr_add_watch;
283 chr->chr_free = spice_chr_free;
284 chr->chr_set_fe_open = set_fe_open;
285 chr->chr_accept_input = spice_chr_accept_input;
286
287 QLIST_INSERT_HEAD(&spice_chars, s, next);
288
289 return chr;
290 }
291
292 static CharDriverState *qemu_chr_open_spice_vmc(const char *id,
293 ChardevBackend *backend,
294 ChardevReturn *ret,
295 bool *be_opened,
296 Error **errp)
297 {
298 ChardevSpiceChannel *spicevmc = backend->u.spicevmc.data;
299 const char *type = spicevmc->type;
300 const char **psubtype = spice_server_char_device_recognized_subtypes();
301 ChardevCommon *common = qapi_ChardevSpiceChannel_base(spicevmc);
302
303 for (; *psubtype != NULL; ++psubtype) {
304 if (strcmp(type, *psubtype) == 0) {
305 break;
306 }
307 }
308 if (*psubtype == NULL) {
309 fprintf(stderr, "spice-qemu-char: unsupported type: %s\n", type);
310 print_allowed_subtypes();
311 return NULL;
312 }
313
314 *be_opened = false;
315 return chr_open(type, spice_vmc_set_fe_open, common, errp);
316 }
317
318 #if SPICE_SERVER_VERSION >= 0x000c02
319 static CharDriverState *qemu_chr_open_spice_port(const char *id,
320 ChardevBackend *backend,
321 ChardevReturn *ret,
322 bool *be_opened,
323 Error **errp)
324 {
325 ChardevSpicePort *spiceport = backend->u.spiceport.data;
326 const char *name = spiceport->fqdn;
327 ChardevCommon *common = qapi_ChardevSpicePort_base(spiceport);
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, common, errp);
337 if (!chr) {
338 return NULL;
339 }
340 *be_opened = false;
341 s = chr->opaque;
342 s->sin.portname = g_strdup(name);
343
344 return chr;
345 }
346
347 void qemu_spice_register_ports(void)
348 {
349 SpiceCharDriver *s;
350
351 QLIST_FOREACH(s, &spice_chars, next) {
352 if (s->sin.portname == NULL) {
353 continue;
354 }
355 vmc_register_interface(s);
356 }
357 }
358 #endif
359
360 static void qemu_chr_parse_spice_vmc(QemuOpts *opts, ChardevBackend *backend,
361 Error **errp)
362 {
363 const char *name = qemu_opt_get(opts, "name");
364 ChardevSpiceChannel *spicevmc;
365
366 if (name == NULL) {
367 error_setg(errp, "chardev: spice channel: no name given");
368 return;
369 }
370 spicevmc = backend->u.spicevmc.data = g_new0(ChardevSpiceChannel, 1);
371 qemu_chr_parse_common(opts, qapi_ChardevSpiceChannel_base(spicevmc));
372 spicevmc->type = g_strdup(name);
373 }
374
375 static void qemu_chr_parse_spice_port(QemuOpts *opts, ChardevBackend *backend,
376 Error **errp)
377 {
378 const char *name = qemu_opt_get(opts, "name");
379 ChardevSpicePort *spiceport;
380
381 if (name == NULL) {
382 error_setg(errp, "chardev: spice port: no name given");
383 return;
384 }
385 spiceport = backend->u.spiceport.data = g_new0(ChardevSpicePort, 1);
386 qemu_chr_parse_common(opts, qapi_ChardevSpicePort_base(spiceport));
387 spiceport->fqdn = g_strdup(name);
388 }
389
390 static void register_types(void)
391 {
392 register_char_driver("spicevmc", CHARDEV_BACKEND_KIND_SPICEVMC,
393 qemu_chr_parse_spice_vmc, qemu_chr_open_spice_vmc);
394 register_char_driver("spiceport", CHARDEV_BACKEND_KIND_SPICEPORT,
395 qemu_chr_parse_spice_port, qemu_chr_open_spice_port);
396 }
397
398 type_init(register_types);