root / hw / ivshmem.c @ 927d4878
History | View | Annotate | Download (22.6 kB)
1 |
/*
|
---|---|
2 |
* Inter-VM Shared Memory PCI device.
|
3 |
*
|
4 |
* Author:
|
5 |
* Cam Macdonell <cam@cs.ualberta.ca>
|
6 |
*
|
7 |
* Based On: cirrus_vga.c
|
8 |
* Copyright (c) 2004 Fabrice Bellard
|
9 |
* Copyright (c) 2004 Makoto Suzuki (suzu)
|
10 |
*
|
11 |
* and rtl8139.c
|
12 |
* Copyright (c) 2006 Igor Kovalenko
|
13 |
*
|
14 |
* This code is licensed under the GNU GPL v2.
|
15 |
*
|
16 |
* Contributions after 2012-01-13 are licensed under the terms of the
|
17 |
* GNU GPL, version 2 or (at your option) any later version.
|
18 |
*/
|
19 |
#include "hw.h" |
20 |
#include "pc.h" |
21 |
#include "pci/pci.h" |
22 |
#include "pci/msix.h" |
23 |
#include "sysemu/kvm.h" |
24 |
#include "migration/migration.h" |
25 |
#include "qapi/qmp/qerror.h" |
26 |
#include "qemu/event_notifier.h" |
27 |
#include "char/char.h" |
28 |
|
29 |
#include <sys/mman.h> |
30 |
#include <sys/types.h> |
31 |
|
32 |
#define IVSHMEM_IOEVENTFD 0 |
33 |
#define IVSHMEM_MSI 1 |
34 |
|
35 |
#define IVSHMEM_PEER 0 |
36 |
#define IVSHMEM_MASTER 1 |
37 |
|
38 |
#define IVSHMEM_REG_BAR_SIZE 0x100 |
39 |
|
40 |
//#define DEBUG_IVSHMEM
|
41 |
#ifdef DEBUG_IVSHMEM
|
42 |
#define IVSHMEM_DPRINTF(fmt, ...) \
|
43 |
do {printf("IVSHMEM: " fmt, ## __VA_ARGS__); } while (0) |
44 |
#else
|
45 |
#define IVSHMEM_DPRINTF(fmt, ...)
|
46 |
#endif
|
47 |
|
48 |
typedef struct Peer { |
49 |
int nb_eventfds;
|
50 |
EventNotifier *eventfds; |
51 |
} Peer; |
52 |
|
53 |
typedef struct EventfdEntry { |
54 |
PCIDevice *pdev; |
55 |
int vector;
|
56 |
} EventfdEntry; |
57 |
|
58 |
typedef struct IVShmemState { |
59 |
PCIDevice dev; |
60 |
uint32_t intrmask; |
61 |
uint32_t intrstatus; |
62 |
uint32_t doorbell; |
63 |
|
64 |
CharDriverState **eventfd_chr; |
65 |
CharDriverState *server_chr; |
66 |
MemoryRegion ivshmem_mmio; |
67 |
|
68 |
/* We might need to register the BAR before we actually have the memory.
|
69 |
* So prepare a container MemoryRegion for the BAR immediately and
|
70 |
* add a subregion when we have the memory.
|
71 |
*/
|
72 |
MemoryRegion bar; |
73 |
MemoryRegion ivshmem; |
74 |
uint64_t ivshmem_size; /* size of shared memory region */
|
75 |
uint32_t ivshmem_attr; |
76 |
uint32_t ivshmem_64bit; |
77 |
int shm_fd; /* shared memory file descriptor */ |
78 |
|
79 |
Peer *peers; |
80 |
int nb_peers; /* how many guests we have space for */ |
81 |
int max_peer; /* maximum numbered peer */ |
82 |
|
83 |
int vm_id;
|
84 |
uint32_t vectors; |
85 |
uint32_t features; |
86 |
EventfdEntry *eventfd_table; |
87 |
|
88 |
Error *migration_blocker; |
89 |
|
90 |
char * shmobj;
|
91 |
char * sizearg;
|
92 |
char * role;
|
93 |
int role_val; /* scalar to avoid multiple string comparisons */ |
94 |
} IVShmemState; |
95 |
|
96 |
/* registers for the Inter-VM shared memory device */
|
97 |
enum ivshmem_registers {
|
98 |
INTRMASK = 0,
|
99 |
INTRSTATUS = 4,
|
100 |
IVPOSITION = 8,
|
101 |
DOORBELL = 12,
|
102 |
}; |
103 |
|
104 |
static inline uint32_t ivshmem_has_feature(IVShmemState *ivs, |
105 |
unsigned int feature) { |
106 |
return (ivs->features & (1 << feature)); |
107 |
} |
108 |
|
109 |
static inline bool is_power_of_two(uint64_t x) { |
110 |
return (x & (x - 1)) == 0; |
111 |
} |
112 |
|
113 |
/* accessing registers - based on rtl8139 */
|
114 |
static void ivshmem_update_irq(IVShmemState *s, int val) |
115 |
{ |
116 |
int isr;
|
117 |
isr = (s->intrstatus & s->intrmask) & 0xffffffff;
|
118 |
|
119 |
/* don't print ISR resets */
|
120 |
if (isr) {
|
121 |
IVSHMEM_DPRINTF("Set IRQ to %d (%04x %04x)\n",
|
122 |
isr ? 1 : 0, s->intrstatus, s->intrmask); |
123 |
} |
124 |
|
125 |
qemu_set_irq(s->dev.irq[0], (isr != 0)); |
126 |
} |
127 |
|
128 |
static void ivshmem_IntrMask_write(IVShmemState *s, uint32_t val) |
129 |
{ |
130 |
IVSHMEM_DPRINTF("IntrMask write(w) val = 0x%04x\n", val);
|
131 |
|
132 |
s->intrmask = val; |
133 |
|
134 |
ivshmem_update_irq(s, val); |
135 |
} |
136 |
|
137 |
static uint32_t ivshmem_IntrMask_read(IVShmemState *s)
|
138 |
{ |
139 |
uint32_t ret = s->intrmask; |
140 |
|
141 |
IVSHMEM_DPRINTF("intrmask read(w) val = 0x%04x\n", ret);
|
142 |
|
143 |
return ret;
|
144 |
} |
145 |
|
146 |
static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val) |
147 |
{ |
148 |
IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val);
|
149 |
|
150 |
s->intrstatus = val; |
151 |
|
152 |
ivshmem_update_irq(s, val); |
153 |
} |
154 |
|
155 |
static uint32_t ivshmem_IntrStatus_read(IVShmemState *s)
|
156 |
{ |
157 |
uint32_t ret = s->intrstatus; |
158 |
|
159 |
/* reading ISR clears all interrupts */
|
160 |
s->intrstatus = 0;
|
161 |
|
162 |
ivshmem_update_irq(s, 0);
|
163 |
|
164 |
return ret;
|
165 |
} |
166 |
|
167 |
static void ivshmem_io_write(void *opaque, hwaddr addr, |
168 |
uint64_t val, unsigned size)
|
169 |
{ |
170 |
IVShmemState *s = opaque; |
171 |
|
172 |
uint16_t dest = val >> 16;
|
173 |
uint16_t vector = val & 0xff;
|
174 |
|
175 |
addr &= 0xfc;
|
176 |
|
177 |
IVSHMEM_DPRINTF("writing to addr " TARGET_FMT_plx "\n", addr); |
178 |
switch (addr)
|
179 |
{ |
180 |
case INTRMASK:
|
181 |
ivshmem_IntrMask_write(s, val); |
182 |
break;
|
183 |
|
184 |
case INTRSTATUS:
|
185 |
ivshmem_IntrStatus_write(s, val); |
186 |
break;
|
187 |
|
188 |
case DOORBELL:
|
189 |
/* check that dest VM ID is reasonable */
|
190 |
if (dest > s->max_peer) {
|
191 |
IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest);
|
192 |
break;
|
193 |
} |
194 |
|
195 |
/* check doorbell range */
|
196 |
if (vector < s->peers[dest].nb_eventfds) {
|
197 |
IVSHMEM_DPRINTF("Notifying VM %d on vector %d\n", dest, vector);
|
198 |
event_notifier_set(&s->peers[dest].eventfds[vector]); |
199 |
} |
200 |
break;
|
201 |
default:
|
202 |
IVSHMEM_DPRINTF("Invalid VM Doorbell VM %d\n", dest);
|
203 |
} |
204 |
} |
205 |
|
206 |
static uint64_t ivshmem_io_read(void *opaque, hwaddr addr, |
207 |
unsigned size)
|
208 |
{ |
209 |
|
210 |
IVShmemState *s = opaque; |
211 |
uint32_t ret; |
212 |
|
213 |
switch (addr)
|
214 |
{ |
215 |
case INTRMASK:
|
216 |
ret = ivshmem_IntrMask_read(s); |
217 |
break;
|
218 |
|
219 |
case INTRSTATUS:
|
220 |
ret = ivshmem_IntrStatus_read(s); |
221 |
break;
|
222 |
|
223 |
case IVPOSITION:
|
224 |
/* return my VM ID if the memory is mapped */
|
225 |
if (s->shm_fd > 0) { |
226 |
ret = s->vm_id; |
227 |
} else {
|
228 |
ret = -1;
|
229 |
} |
230 |
break;
|
231 |
|
232 |
default:
|
233 |
IVSHMEM_DPRINTF("why are we reading " TARGET_FMT_plx "\n", addr); |
234 |
ret = 0;
|
235 |
} |
236 |
|
237 |
return ret;
|
238 |
} |
239 |
|
240 |
static const MemoryRegionOps ivshmem_mmio_ops = { |
241 |
.read = ivshmem_io_read, |
242 |
.write = ivshmem_io_write, |
243 |
.endianness = DEVICE_NATIVE_ENDIAN, |
244 |
.impl = { |
245 |
.min_access_size = 4,
|
246 |
.max_access_size = 4,
|
247 |
}, |
248 |
}; |
249 |
|
250 |
static void ivshmem_receive(void *opaque, const uint8_t *buf, int size) |
251 |
{ |
252 |
IVShmemState *s = opaque; |
253 |
|
254 |
ivshmem_IntrStatus_write(s, *buf); |
255 |
|
256 |
IVSHMEM_DPRINTF("ivshmem_receive 0x%02x\n", *buf);
|
257 |
} |
258 |
|
259 |
static int ivshmem_can_receive(void * opaque) |
260 |
{ |
261 |
return 8; |
262 |
} |
263 |
|
264 |
static void ivshmem_event(void *opaque, int event) |
265 |
{ |
266 |
IVSHMEM_DPRINTF("ivshmem_event %d\n", event);
|
267 |
} |
268 |
|
269 |
static void fake_irqfd(void *opaque, const uint8_t *buf, int size) { |
270 |
|
271 |
EventfdEntry *entry = opaque; |
272 |
PCIDevice *pdev = entry->pdev; |
273 |
|
274 |
IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, entry->vector);
|
275 |
msix_notify(pdev, entry->vector); |
276 |
} |
277 |
|
278 |
static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *n, |
279 |
int vector)
|
280 |
{ |
281 |
/* create a event character device based on the passed eventfd */
|
282 |
IVShmemState *s = opaque; |
283 |
CharDriverState * chr; |
284 |
int eventfd = event_notifier_get_fd(n);
|
285 |
|
286 |
chr = qemu_chr_open_eventfd(eventfd); |
287 |
|
288 |
if (chr == NULL) { |
289 |
fprintf(stderr, "creating eventfd for eventfd %d failed\n", eventfd);
|
290 |
exit(-1);
|
291 |
} |
292 |
|
293 |
/* if MSI is supported we need multiple interrupts */
|
294 |
if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
|
295 |
s->eventfd_table[vector].pdev = &s->dev; |
296 |
s->eventfd_table[vector].vector = vector; |
297 |
|
298 |
qemu_chr_add_handlers(chr, ivshmem_can_receive, fake_irqfd, |
299 |
ivshmem_event, &s->eventfd_table[vector]); |
300 |
} else {
|
301 |
qemu_chr_add_handlers(chr, ivshmem_can_receive, ivshmem_receive, |
302 |
ivshmem_event, s); |
303 |
} |
304 |
|
305 |
return chr;
|
306 |
|
307 |
} |
308 |
|
309 |
static int check_shm_size(IVShmemState *s, int fd) { |
310 |
/* check that the guest isn't going to try and map more memory than the
|
311 |
* the object has allocated return -1 to indicate error */
|
312 |
|
313 |
struct stat buf;
|
314 |
|
315 |
fstat(fd, &buf); |
316 |
|
317 |
if (s->ivshmem_size > buf.st_size) {
|
318 |
fprintf(stderr, |
319 |
"IVSHMEM ERROR: Requested memory size greater"
|
320 |
" than shared object size (%" PRIu64 " > %" PRIu64")\n", |
321 |
s->ivshmem_size, (uint64_t)buf.st_size); |
322 |
return -1; |
323 |
} else {
|
324 |
return 0; |
325 |
} |
326 |
} |
327 |
|
328 |
/* create the shared memory BAR when we are not using the server, so we can
|
329 |
* create the BAR and map the memory immediately */
|
330 |
static void create_shared_memory_BAR(IVShmemState *s, int fd) { |
331 |
|
332 |
void * ptr;
|
333 |
|
334 |
s->shm_fd = fd; |
335 |
|
336 |
ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); |
337 |
|
338 |
memory_region_init_ram_ptr(&s->ivshmem, "ivshmem.bar2",
|
339 |
s->ivshmem_size, ptr); |
340 |
vmstate_register_ram(&s->ivshmem, &s->dev.qdev); |
341 |
memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
|
342 |
|
343 |
/* region for shared memory */
|
344 |
pci_register_bar(&s->dev, 2, s->ivshmem_attr, &s->bar);
|
345 |
} |
346 |
|
347 |
static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i) |
348 |
{ |
349 |
memory_region_add_eventfd(&s->ivshmem_mmio, |
350 |
DOORBELL, |
351 |
4,
|
352 |
true,
|
353 |
(posn << 16) | i,
|
354 |
&s->peers[posn].eventfds[i]); |
355 |
} |
356 |
|
357 |
static void ivshmem_del_eventfd(IVShmemState *s, int posn, int i) |
358 |
{ |
359 |
memory_region_del_eventfd(&s->ivshmem_mmio, |
360 |
DOORBELL, |
361 |
4,
|
362 |
true,
|
363 |
(posn << 16) | i,
|
364 |
&s->peers[posn].eventfds[i]); |
365 |
} |
366 |
|
367 |
static void close_guest_eventfds(IVShmemState *s, int posn) |
368 |
{ |
369 |
int i, guest_curr_max;
|
370 |
|
371 |
if (!ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
|
372 |
return;
|
373 |
} |
374 |
|
375 |
guest_curr_max = s->peers[posn].nb_eventfds; |
376 |
|
377 |
memory_region_transaction_begin(); |
378 |
for (i = 0; i < guest_curr_max; i++) { |
379 |
ivshmem_del_eventfd(s, posn, i); |
380 |
} |
381 |
memory_region_transaction_commit(); |
382 |
for (i = 0; i < guest_curr_max; i++) { |
383 |
event_notifier_cleanup(&s->peers[posn].eventfds[i]); |
384 |
} |
385 |
|
386 |
g_free(s->peers[posn].eventfds); |
387 |
s->peers[posn].nb_eventfds = 0;
|
388 |
} |
389 |
|
390 |
/* this function increase the dynamic storage need to store data about other
|
391 |
* guests */
|
392 |
static void increase_dynamic_storage(IVShmemState *s, int new_min_size) { |
393 |
|
394 |
int j, old_nb_alloc;
|
395 |
|
396 |
old_nb_alloc = s->nb_peers; |
397 |
|
398 |
while (new_min_size >= s->nb_peers)
|
399 |
s->nb_peers = s->nb_peers * 2;
|
400 |
|
401 |
IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers);
|
402 |
s->peers = g_realloc(s->peers, s->nb_peers * sizeof(Peer));
|
403 |
|
404 |
/* zero out new pointers */
|
405 |
for (j = old_nb_alloc; j < s->nb_peers; j++) {
|
406 |
s->peers[j].eventfds = NULL;
|
407 |
s->peers[j].nb_eventfds = 0;
|
408 |
} |
409 |
} |
410 |
|
411 |
static void ivshmem_read(void *opaque, const uint8_t * buf, int flags) |
412 |
{ |
413 |
IVShmemState *s = opaque; |
414 |
int incoming_fd, tmp_fd;
|
415 |
int guest_max_eventfd;
|
416 |
long incoming_posn;
|
417 |
|
418 |
memcpy(&incoming_posn, buf, sizeof(long)); |
419 |
/* pick off s->server_chr->msgfd and store it, posn should accompany msg */
|
420 |
tmp_fd = qemu_chr_fe_get_msgfd(s->server_chr); |
421 |
IVSHMEM_DPRINTF("posn is %ld, fd is %d\n", incoming_posn, tmp_fd);
|
422 |
|
423 |
/* make sure we have enough space for this guest */
|
424 |
if (incoming_posn >= s->nb_peers) {
|
425 |
increase_dynamic_storage(s, incoming_posn); |
426 |
} |
427 |
|
428 |
if (tmp_fd == -1) { |
429 |
/* if posn is positive and unseen before then this is our posn*/
|
430 |
if ((incoming_posn >= 0) && |
431 |
(s->peers[incoming_posn].eventfds == NULL)) {
|
432 |
/* receive our posn */
|
433 |
s->vm_id = incoming_posn; |
434 |
return;
|
435 |
} else {
|
436 |
/* otherwise an fd == -1 means an existing guest has gone away */
|
437 |
IVSHMEM_DPRINTF("posn %ld has gone away\n", incoming_posn);
|
438 |
close_guest_eventfds(s, incoming_posn); |
439 |
return;
|
440 |
} |
441 |
} |
442 |
|
443 |
/* because of the implementation of get_msgfd, we need a dup */
|
444 |
incoming_fd = dup(tmp_fd); |
445 |
|
446 |
if (incoming_fd == -1) { |
447 |
fprintf(stderr, "could not allocate file descriptor %s\n",
|
448 |
strerror(errno)); |
449 |
return;
|
450 |
} |
451 |
|
452 |
/* if the position is -1, then it's shared memory region fd */
|
453 |
if (incoming_posn == -1) { |
454 |
|
455 |
void * map_ptr;
|
456 |
|
457 |
s->max_peer = 0;
|
458 |
|
459 |
if (check_shm_size(s, incoming_fd) == -1) { |
460 |
exit(-1);
|
461 |
} |
462 |
|
463 |
/* mmap the region and map into the BAR2 */
|
464 |
map_ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED,
|
465 |
incoming_fd, 0);
|
466 |
memory_region_init_ram_ptr(&s->ivshmem, |
467 |
"ivshmem.bar2", s->ivshmem_size, map_ptr);
|
468 |
vmstate_register_ram(&s->ivshmem, &s->dev.qdev); |
469 |
|
470 |
IVSHMEM_DPRINTF("guest h/w addr = %" PRIu64 ", size = %" PRIu64 "\n", |
471 |
s->ivshmem_offset, s->ivshmem_size); |
472 |
|
473 |
memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
|
474 |
|
475 |
/* only store the fd if it is successfully mapped */
|
476 |
s->shm_fd = incoming_fd; |
477 |
|
478 |
return;
|
479 |
} |
480 |
|
481 |
/* each guest has an array of eventfds, and we keep track of how many
|
482 |
* guests for each VM */
|
483 |
guest_max_eventfd = s->peers[incoming_posn].nb_eventfds; |
484 |
|
485 |
if (guest_max_eventfd == 0) { |
486 |
/* one eventfd per MSI vector */
|
487 |
s->peers[incoming_posn].eventfds = g_new(EventNotifier, s->vectors); |
488 |
} |
489 |
|
490 |
/* this is an eventfd for a particular guest VM */
|
491 |
IVSHMEM_DPRINTF("eventfds[%ld][%d] = %d\n", incoming_posn,
|
492 |
guest_max_eventfd, incoming_fd); |
493 |
event_notifier_init_fd(&s->peers[incoming_posn].eventfds[guest_max_eventfd], |
494 |
incoming_fd); |
495 |
|
496 |
/* increment count for particular guest */
|
497 |
s->peers[incoming_posn].nb_eventfds++; |
498 |
|
499 |
/* keep track of the maximum VM ID */
|
500 |
if (incoming_posn > s->max_peer) {
|
501 |
s->max_peer = incoming_posn; |
502 |
} |
503 |
|
504 |
if (incoming_posn == s->vm_id) {
|
505 |
s->eventfd_chr[guest_max_eventfd] = create_eventfd_chr_device(s, |
506 |
&s->peers[s->vm_id].eventfds[guest_max_eventfd], |
507 |
guest_max_eventfd); |
508 |
} |
509 |
|
510 |
if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
|
511 |
ivshmem_add_eventfd(s, incoming_posn, guest_max_eventfd); |
512 |
} |
513 |
} |
514 |
|
515 |
/* Select the MSI-X vectors used by device.
|
516 |
* ivshmem maps events to vectors statically, so
|
517 |
* we just enable all vectors on init and after reset. */
|
518 |
static void ivshmem_use_msix(IVShmemState * s) |
519 |
{ |
520 |
int i;
|
521 |
|
522 |
if (!msix_present(&s->dev)) {
|
523 |
return;
|
524 |
} |
525 |
|
526 |
for (i = 0; i < s->vectors; i++) { |
527 |
msix_vector_use(&s->dev, i); |
528 |
} |
529 |
} |
530 |
|
531 |
static void ivshmem_reset(DeviceState *d) |
532 |
{ |
533 |
IVShmemState *s = DO_UPCAST(IVShmemState, dev.qdev, d); |
534 |
|
535 |
s->intrstatus = 0;
|
536 |
ivshmem_use_msix(s); |
537 |
} |
538 |
|
539 |
static uint64_t ivshmem_get_size(IVShmemState * s) {
|
540 |
|
541 |
uint64_t value; |
542 |
char *ptr;
|
543 |
|
544 |
value = strtoull(s->sizearg, &ptr, 10);
|
545 |
switch (*ptr) {
|
546 |
case 0: case 'M': case 'm': |
547 |
value <<= 20;
|
548 |
break;
|
549 |
case 'G': case 'g': |
550 |
value <<= 30;
|
551 |
break;
|
552 |
default:
|
553 |
fprintf(stderr, "qemu: invalid ram size: %s\n", s->sizearg);
|
554 |
exit(1);
|
555 |
} |
556 |
|
557 |
/* BARs must be a power of 2 */
|
558 |
if (!is_power_of_two(value)) {
|
559 |
fprintf(stderr, "ivshmem: size must be power of 2\n");
|
560 |
exit(1);
|
561 |
} |
562 |
|
563 |
return value;
|
564 |
} |
565 |
|
566 |
static void ivshmem_setup_msi(IVShmemState * s) |
567 |
{ |
568 |
if (msix_init_exclusive_bar(&s->dev, s->vectors, 1)) { |
569 |
IVSHMEM_DPRINTF("msix initialization failed\n");
|
570 |
exit(1);
|
571 |
} |
572 |
|
573 |
IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
|
574 |
|
575 |
/* allocate QEMU char devices for receiving interrupts */
|
576 |
s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry));
|
577 |
|
578 |
ivshmem_use_msix(s); |
579 |
} |
580 |
|
581 |
static void ivshmem_save(QEMUFile* f, void *opaque) |
582 |
{ |
583 |
IVShmemState *proxy = opaque; |
584 |
|
585 |
IVSHMEM_DPRINTF("ivshmem_save\n");
|
586 |
pci_device_save(&proxy->dev, f); |
587 |
|
588 |
if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
|
589 |
msix_save(&proxy->dev, f); |
590 |
} else {
|
591 |
qemu_put_be32(f, proxy->intrstatus); |
592 |
qemu_put_be32(f, proxy->intrmask); |
593 |
} |
594 |
|
595 |
} |
596 |
|
597 |
static int ivshmem_load(QEMUFile* f, void *opaque, int version_id) |
598 |
{ |
599 |
IVSHMEM_DPRINTF("ivshmem_load\n");
|
600 |
|
601 |
IVShmemState *proxy = opaque; |
602 |
int ret;
|
603 |
|
604 |
if (version_id > 0) { |
605 |
return -EINVAL;
|
606 |
} |
607 |
|
608 |
if (proxy->role_val == IVSHMEM_PEER) {
|
609 |
fprintf(stderr, "ivshmem: 'peer' devices are not migratable\n");
|
610 |
return -EINVAL;
|
611 |
} |
612 |
|
613 |
ret = pci_device_load(&proxy->dev, f); |
614 |
if (ret) {
|
615 |
return ret;
|
616 |
} |
617 |
|
618 |
if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
|
619 |
msix_load(&proxy->dev, f); |
620 |
ivshmem_use_msix(proxy); |
621 |
} else {
|
622 |
proxy->intrstatus = qemu_get_be32(f); |
623 |
proxy->intrmask = qemu_get_be32(f); |
624 |
} |
625 |
|
626 |
return 0; |
627 |
} |
628 |
|
629 |
static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address, |
630 |
uint32_t val, int len)
|
631 |
{ |
632 |
pci_default_write_config(pci_dev, address, val, len); |
633 |
msix_write_config(pci_dev, address, val, len); |
634 |
} |
635 |
|
636 |
static int pci_ivshmem_init(PCIDevice *dev) |
637 |
{ |
638 |
IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev); |
639 |
uint8_t *pci_conf; |
640 |
|
641 |
if (s->sizearg == NULL) |
642 |
s->ivshmem_size = 4 << 20; /* 4 MB default */ |
643 |
else {
|
644 |
s->ivshmem_size = ivshmem_get_size(s); |
645 |
} |
646 |
|
647 |
register_savevm(&s->dev.qdev, "ivshmem", 0, 0, ivshmem_save, ivshmem_load, |
648 |
dev); |
649 |
|
650 |
/* IRQFD requires MSI */
|
651 |
if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
|
652 |
!ivshmem_has_feature(s, IVSHMEM_MSI)) { |
653 |
fprintf(stderr, "ivshmem: ioeventfd/irqfd requires MSI\n");
|
654 |
exit(1);
|
655 |
} |
656 |
|
657 |
/* check that role is reasonable */
|
658 |
if (s->role) {
|
659 |
if (strncmp(s->role, "peer", 5) == 0) { |
660 |
s->role_val = IVSHMEM_PEER; |
661 |
} else if (strncmp(s->role, "master", 7) == 0) { |
662 |
s->role_val = IVSHMEM_MASTER; |
663 |
} else {
|
664 |
fprintf(stderr, "ivshmem: 'role' must be 'peer' or 'master'\n");
|
665 |
exit(1);
|
666 |
} |
667 |
} else {
|
668 |
s->role_val = IVSHMEM_MASTER; /* default */
|
669 |
} |
670 |
|
671 |
if (s->role_val == IVSHMEM_PEER) {
|
672 |
error_set(&s->migration_blocker, QERR_DEVICE_FEATURE_BLOCKS_MIGRATION, |
673 |
"peer mode", "ivshmem"); |
674 |
migrate_add_blocker(s->migration_blocker); |
675 |
} |
676 |
|
677 |
pci_conf = s->dev.config; |
678 |
pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY; |
679 |
|
680 |
pci_config_set_interrupt_pin(pci_conf, 1);
|
681 |
|
682 |
s->shm_fd = 0;
|
683 |
|
684 |
memory_region_init_io(&s->ivshmem_mmio, &ivshmem_mmio_ops, s, |
685 |
"ivshmem-mmio", IVSHMEM_REG_BAR_SIZE);
|
686 |
|
687 |
/* region for registers*/
|
688 |
pci_register_bar(&s->dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY,
|
689 |
&s->ivshmem_mmio); |
690 |
|
691 |
memory_region_init(&s->bar, "ivshmem-bar2-container", s->ivshmem_size);
|
692 |
s->ivshmem_attr = PCI_BASE_ADDRESS_SPACE_MEMORY | |
693 |
PCI_BASE_ADDRESS_MEM_PREFETCH; |
694 |
if (s->ivshmem_64bit) {
|
695 |
s->ivshmem_attr |= PCI_BASE_ADDRESS_MEM_TYPE_64; |
696 |
} |
697 |
|
698 |
if ((s->server_chr != NULL) && |
699 |
(strncmp(s->server_chr->filename, "unix:", 5) == 0)) { |
700 |
/* if we get a UNIX socket as the parameter we will talk
|
701 |
* to the ivshmem server to receive the memory region */
|
702 |
|
703 |
if (s->shmobj != NULL) { |
704 |
fprintf(stderr, "WARNING: do not specify both 'chardev' "
|
705 |
"and 'shm' with ivshmem\n");
|
706 |
} |
707 |
|
708 |
IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
|
709 |
s->server_chr->filename); |
710 |
|
711 |
if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
|
712 |
ivshmem_setup_msi(s); |
713 |
} |
714 |
|
715 |
/* we allocate enough space for 16 guests and grow as needed */
|
716 |
s->nb_peers = 16;
|
717 |
s->vm_id = -1;
|
718 |
|
719 |
/* allocate/initialize space for interrupt handling */
|
720 |
s->peers = g_malloc0(s->nb_peers * sizeof(Peer));
|
721 |
|
722 |
pci_register_bar(&s->dev, 2, s->ivshmem_attr, &s->bar);
|
723 |
|
724 |
s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *));
|
725 |
|
726 |
qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read, |
727 |
ivshmem_event, s); |
728 |
} else {
|
729 |
/* just map the file immediately, we're not using a server */
|
730 |
int fd;
|
731 |
|
732 |
if (s->shmobj == NULL) { |
733 |
fprintf(stderr, "Must specify 'chardev' or 'shm' to ivshmem\n");
|
734 |
} |
735 |
|
736 |
IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj);
|
737 |
|
738 |
/* try opening with O_EXCL and if it succeeds zero the memory
|
739 |
* by truncating to 0 */
|
740 |
if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR|O_EXCL,
|
741 |
S_IRWXU|S_IRWXG|S_IRWXO)) > 0) {
|
742 |
/* truncate file to length PCI device's memory */
|
743 |
if (ftruncate(fd, s->ivshmem_size) != 0) { |
744 |
fprintf(stderr, "ivshmem: could not truncate shared file\n");
|
745 |
} |
746 |
|
747 |
} else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR, |
748 |
S_IRWXU|S_IRWXG|S_IRWXO)) < 0) {
|
749 |
fprintf(stderr, "ivshmem: could not open shared file\n");
|
750 |
exit(-1);
|
751 |
|
752 |
} |
753 |
|
754 |
if (check_shm_size(s, fd) == -1) { |
755 |
exit(-1);
|
756 |
} |
757 |
|
758 |
create_shared_memory_BAR(s, fd); |
759 |
|
760 |
} |
761 |
|
762 |
s->dev.config_write = ivshmem_write_config; |
763 |
|
764 |
return 0; |
765 |
} |
766 |
|
767 |
static void pci_ivshmem_uninit(PCIDevice *dev) |
768 |
{ |
769 |
IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev); |
770 |
|
771 |
if (s->migration_blocker) {
|
772 |
migrate_del_blocker(s->migration_blocker); |
773 |
error_free(s->migration_blocker); |
774 |
} |
775 |
|
776 |
memory_region_destroy(&s->ivshmem_mmio); |
777 |
memory_region_del_subregion(&s->bar, &s->ivshmem); |
778 |
vmstate_unregister_ram(&s->ivshmem, &s->dev.qdev); |
779 |
memory_region_destroy(&s->ivshmem); |
780 |
memory_region_destroy(&s->bar); |
781 |
unregister_savevm(&dev->qdev, "ivshmem", s);
|
782 |
} |
783 |
|
784 |
static Property ivshmem_properties[] = {
|
785 |
DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
|
786 |
DEFINE_PROP_STRING("size", IVShmemState, sizearg),
|
787 |
DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1), |
788 |
DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD, false), |
789 |
DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true), |
790 |
DEFINE_PROP_STRING("shm", IVShmemState, shmobj),
|
791 |
DEFINE_PROP_STRING("role", IVShmemState, role),
|
792 |
DEFINE_PROP_UINT32("use64", IVShmemState, ivshmem_64bit, 1), |
793 |
DEFINE_PROP_END_OF_LIST(), |
794 |
}; |
795 |
|
796 |
static void ivshmem_class_init(ObjectClass *klass, void *data) |
797 |
{ |
798 |
DeviceClass *dc = DEVICE_CLASS(klass); |
799 |
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
800 |
|
801 |
k->init = pci_ivshmem_init; |
802 |
k->exit = pci_ivshmem_uninit; |
803 |
k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; |
804 |
k->device_id = 0x1110;
|
805 |
k->class_id = PCI_CLASS_MEMORY_RAM; |
806 |
dc->reset = ivshmem_reset; |
807 |
dc->props = ivshmem_properties; |
808 |
} |
809 |
|
810 |
static TypeInfo ivshmem_info = {
|
811 |
.name = "ivshmem",
|
812 |
.parent = TYPE_PCI_DEVICE, |
813 |
.instance_size = sizeof(IVShmemState),
|
814 |
.class_init = ivshmem_class_init, |
815 |
}; |
816 |
|
817 |
static void ivshmem_register_types(void) |
818 |
{ |
819 |
type_register_static(&ivshmem_info); |
820 |
} |
821 |
|
822 |
type_init(ivshmem_register_types) |