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Commit | Line | Data |
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6cbf4c8c CM |
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. | |
6b620ca3 PB |
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. | |
6cbf4c8c CM |
18 | */ |
19 | #include "hw.h" | |
20 | #include "pc.h" | |
21 | #include "pci.h" | |
22 | #include "msix.h" | |
23 | #include "kvm.h" | |
38e0735e AL |
24 | #include "migration.h" |
25 | #include "qerror.h" | |
563027cc | 26 | #include "event_notifier.h" |
6cbf4c8c CM |
27 | |
28 | #include <sys/mman.h> | |
29 | #include <sys/types.h> | |
30 | ||
31 | #define IVSHMEM_IOEVENTFD 0 | |
32 | #define IVSHMEM_MSI 1 | |
33 | ||
34 | #define IVSHMEM_PEER 0 | |
35 | #define IVSHMEM_MASTER 1 | |
36 | ||
37 | #define IVSHMEM_REG_BAR_SIZE 0x100 | |
38 | ||
39 | //#define DEBUG_IVSHMEM | |
40 | #ifdef DEBUG_IVSHMEM | |
41 | #define IVSHMEM_DPRINTF(fmt, ...) \ | |
42 | do {printf("IVSHMEM: " fmt, ## __VA_ARGS__); } while (0) | |
43 | #else | |
44 | #define IVSHMEM_DPRINTF(fmt, ...) | |
45 | #endif | |
46 | ||
47 | typedef struct Peer { | |
48 | int nb_eventfds; | |
563027cc | 49 | EventNotifier *eventfds; |
6cbf4c8c CM |
50 | } Peer; |
51 | ||
52 | typedef struct EventfdEntry { | |
53 | PCIDevice *pdev; | |
54 | int vector; | |
55 | } EventfdEntry; | |
56 | ||
57 | typedef struct IVShmemState { | |
58 | PCIDevice dev; | |
59 | uint32_t intrmask; | |
60 | uint32_t intrstatus; | |
61 | uint32_t doorbell; | |
62 | ||
63 | CharDriverState **eventfd_chr; | |
64 | CharDriverState *server_chr; | |
cb06608e | 65 | MemoryRegion ivshmem_mmio; |
6cbf4c8c | 66 | |
cb06608e AK |
67 | /* We might need to register the BAR before we actually have the memory. |
68 | * So prepare a container MemoryRegion for the BAR immediately and | |
69 | * add a subregion when we have the memory. | |
70 | */ | |
71 | MemoryRegion bar; | |
72 | MemoryRegion ivshmem; | |
6cbf4c8c CM |
73 | uint64_t ivshmem_size; /* size of shared memory region */ |
74 | int shm_fd; /* shared memory file descriptor */ | |
75 | ||
76 | Peer *peers; | |
77 | int nb_peers; /* how many guests we have space for */ | |
78 | int max_peer; /* maximum numbered peer */ | |
79 | ||
80 | int vm_id; | |
81 | uint32_t vectors; | |
82 | uint32_t features; | |
83 | EventfdEntry *eventfd_table; | |
84 | ||
38e0735e AL |
85 | Error *migration_blocker; |
86 | ||
6cbf4c8c CM |
87 | char * shmobj; |
88 | char * sizearg; | |
89 | char * role; | |
90 | int role_val; /* scalar to avoid multiple string comparisons */ | |
91 | } IVShmemState; | |
92 | ||
93 | /* registers for the Inter-VM shared memory device */ | |
94 | enum ivshmem_registers { | |
95 | INTRMASK = 0, | |
96 | INTRSTATUS = 4, | |
97 | IVPOSITION = 8, | |
98 | DOORBELL = 12, | |
99 | }; | |
100 | ||
101 | static inline uint32_t ivshmem_has_feature(IVShmemState *ivs, | |
102 | unsigned int feature) { | |
103 | return (ivs->features & (1 << feature)); | |
104 | } | |
105 | ||
106 | static inline bool is_power_of_two(uint64_t x) { | |
107 | return (x & (x - 1)) == 0; | |
108 | } | |
109 | ||
6cbf4c8c CM |
110 | /* accessing registers - based on rtl8139 */ |
111 | static void ivshmem_update_irq(IVShmemState *s, int val) | |
112 | { | |
113 | int isr; | |
114 | isr = (s->intrstatus & s->intrmask) & 0xffffffff; | |
115 | ||
116 | /* don't print ISR resets */ | |
117 | if (isr) { | |
118 | IVSHMEM_DPRINTF("Set IRQ to %d (%04x %04x)\n", | |
119 | isr ? 1 : 0, s->intrstatus, s->intrmask); | |
120 | } | |
121 | ||
122 | qemu_set_irq(s->dev.irq[0], (isr != 0)); | |
123 | } | |
124 | ||
125 | static void ivshmem_IntrMask_write(IVShmemState *s, uint32_t val) | |
126 | { | |
127 | IVSHMEM_DPRINTF("IntrMask write(w) val = 0x%04x\n", val); | |
128 | ||
129 | s->intrmask = val; | |
130 | ||
131 | ivshmem_update_irq(s, val); | |
132 | } | |
133 | ||
134 | static uint32_t ivshmem_IntrMask_read(IVShmemState *s) | |
135 | { | |
136 | uint32_t ret = s->intrmask; | |
137 | ||
138 | IVSHMEM_DPRINTF("intrmask read(w) val = 0x%04x\n", ret); | |
139 | ||
140 | return ret; | |
141 | } | |
142 | ||
143 | static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val) | |
144 | { | |
145 | IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val); | |
146 | ||
147 | s->intrstatus = val; | |
148 | ||
149 | ivshmem_update_irq(s, val); | |
150 | return; | |
151 | } | |
152 | ||
153 | static uint32_t ivshmem_IntrStatus_read(IVShmemState *s) | |
154 | { | |
155 | uint32_t ret = s->intrstatus; | |
156 | ||
157 | /* reading ISR clears all interrupts */ | |
158 | s->intrstatus = 0; | |
159 | ||
160 | ivshmem_update_irq(s, 0); | |
161 | ||
162 | return ret; | |
163 | } | |
164 | ||
cb06608e AK |
165 | static void ivshmem_io_write(void *opaque, target_phys_addr_t addr, |
166 | uint64_t val, unsigned size) | |
6cbf4c8c CM |
167 | { |
168 | IVShmemState *s = opaque; | |
169 | ||
6cbf4c8c CM |
170 | uint16_t dest = val >> 16; |
171 | uint16_t vector = val & 0xff; | |
172 | ||
173 | addr &= 0xfc; | |
174 | ||
175 | IVSHMEM_DPRINTF("writing to addr " TARGET_FMT_plx "\n", addr); | |
176 | switch (addr) | |
177 | { | |
178 | case INTRMASK: | |
179 | ivshmem_IntrMask_write(s, val); | |
180 | break; | |
181 | ||
182 | case INTRSTATUS: | |
183 | ivshmem_IntrStatus_write(s, val); | |
184 | break; | |
185 | ||
186 | case DOORBELL: | |
187 | /* check that dest VM ID is reasonable */ | |
1b27d7a1 | 188 | if (dest > s->max_peer) { |
6cbf4c8c CM |
189 | IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest); |
190 | break; | |
191 | } | |
192 | ||
193 | /* check doorbell range */ | |
1b27d7a1 | 194 | if (vector < s->peers[dest].nb_eventfds) { |
563027cc PB |
195 | IVSHMEM_DPRINTF("Notifying VM %d on vector %d\n", dest, vector); |
196 | event_notifier_set(&s->peers[dest].eventfds[vector]); | |
6cbf4c8c CM |
197 | } |
198 | break; | |
199 | default: | |
200 | IVSHMEM_DPRINTF("Invalid VM Doorbell VM %d\n", dest); | |
201 | } | |
202 | } | |
203 | ||
cb06608e AK |
204 | static uint64_t ivshmem_io_read(void *opaque, target_phys_addr_t addr, |
205 | unsigned size) | |
6cbf4c8c CM |
206 | { |
207 | ||
208 | IVShmemState *s = opaque; | |
209 | uint32_t ret; | |
210 | ||
211 | switch (addr) | |
212 | { | |
213 | case INTRMASK: | |
214 | ret = ivshmem_IntrMask_read(s); | |
215 | break; | |
216 | ||
217 | case INTRSTATUS: | |
218 | ret = ivshmem_IntrStatus_read(s); | |
219 | break; | |
220 | ||
221 | case IVPOSITION: | |
222 | /* return my VM ID if the memory is mapped */ | |
223 | if (s->shm_fd > 0) { | |
224 | ret = s->vm_id; | |
225 | } else { | |
226 | ret = -1; | |
227 | } | |
228 | break; | |
229 | ||
230 | default: | |
231 | IVSHMEM_DPRINTF("why are we reading " TARGET_FMT_plx "\n", addr); | |
232 | ret = 0; | |
233 | } | |
234 | ||
235 | return ret; | |
236 | } | |
237 | ||
cb06608e AK |
238 | static const MemoryRegionOps ivshmem_mmio_ops = { |
239 | .read = ivshmem_io_read, | |
240 | .write = ivshmem_io_write, | |
241 | .endianness = DEVICE_NATIVE_ENDIAN, | |
242 | .impl = { | |
243 | .min_access_size = 4, | |
244 | .max_access_size = 4, | |
245 | }, | |
6cbf4c8c CM |
246 | }; |
247 | ||
248 | static void ivshmem_receive(void *opaque, const uint8_t *buf, int size) | |
249 | { | |
250 | IVShmemState *s = opaque; | |
251 | ||
252 | ivshmem_IntrStatus_write(s, *buf); | |
253 | ||
254 | IVSHMEM_DPRINTF("ivshmem_receive 0x%02x\n", *buf); | |
255 | } | |
256 | ||
257 | static int ivshmem_can_receive(void * opaque) | |
258 | { | |
259 | return 8; | |
260 | } | |
261 | ||
262 | static void ivshmem_event(void *opaque, int event) | |
263 | { | |
264 | IVSHMEM_DPRINTF("ivshmem_event %d\n", event); | |
265 | } | |
266 | ||
267 | static void fake_irqfd(void *opaque, const uint8_t *buf, int size) { | |
268 | ||
269 | EventfdEntry *entry = opaque; | |
270 | PCIDevice *pdev = entry->pdev; | |
271 | ||
272 | IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, entry->vector); | |
273 | msix_notify(pdev, entry->vector); | |
274 | } | |
275 | ||
563027cc PB |
276 | static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *n, |
277 | int vector) | |
6cbf4c8c CM |
278 | { |
279 | /* create a event character device based on the passed eventfd */ | |
280 | IVShmemState *s = opaque; | |
281 | CharDriverState * chr; | |
563027cc | 282 | int eventfd = event_notifier_get_fd(n); |
6cbf4c8c CM |
283 | |
284 | chr = qemu_chr_open_eventfd(eventfd); | |
285 | ||
286 | if (chr == NULL) { | |
287 | fprintf(stderr, "creating eventfd for eventfd %d failed\n", eventfd); | |
288 | exit(-1); | |
289 | } | |
290 | ||
291 | /* if MSI is supported we need multiple interrupts */ | |
292 | if (ivshmem_has_feature(s, IVSHMEM_MSI)) { | |
293 | s->eventfd_table[vector].pdev = &s->dev; | |
294 | s->eventfd_table[vector].vector = vector; | |
295 | ||
296 | qemu_chr_add_handlers(chr, ivshmem_can_receive, fake_irqfd, | |
297 | ivshmem_event, &s->eventfd_table[vector]); | |
298 | } else { | |
299 | qemu_chr_add_handlers(chr, ivshmem_can_receive, ivshmem_receive, | |
300 | ivshmem_event, s); | |
301 | } | |
302 | ||
303 | return chr; | |
304 | ||
305 | } | |
306 | ||
307 | static int check_shm_size(IVShmemState *s, int fd) { | |
308 | /* check that the guest isn't going to try and map more memory than the | |
309 | * the object has allocated return -1 to indicate error */ | |
310 | ||
311 | struct stat buf; | |
312 | ||
313 | fstat(fd, &buf); | |
314 | ||
315 | if (s->ivshmem_size > buf.st_size) { | |
ad0a4ac1 AK |
316 | fprintf(stderr, |
317 | "IVSHMEM ERROR: Requested memory size greater" | |
318 | " than shared object size (%" PRIu64 " > %" PRIu64")\n", | |
319 | s->ivshmem_size, (uint64_t)buf.st_size); | |
6cbf4c8c CM |
320 | return -1; |
321 | } else { | |
322 | return 0; | |
323 | } | |
324 | } | |
325 | ||
326 | /* create the shared memory BAR when we are not using the server, so we can | |
327 | * create the BAR and map the memory immediately */ | |
328 | static void create_shared_memory_BAR(IVShmemState *s, int fd) { | |
329 | ||
330 | void * ptr; | |
331 | ||
332 | s->shm_fd = fd; | |
333 | ||
334 | ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); | |
335 | ||
c5705a77 | 336 | memory_region_init_ram_ptr(&s->ivshmem, "ivshmem.bar2", |
cb06608e | 337 | s->ivshmem_size, ptr); |
c5705a77 | 338 | vmstate_register_ram(&s->ivshmem, &s->dev.qdev); |
cb06608e | 339 | memory_region_add_subregion(&s->bar, 0, &s->ivshmem); |
6cbf4c8c CM |
340 | |
341 | /* region for shared memory */ | |
e824b2cc | 342 | pci_register_bar(&s->dev, 2, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar); |
6cbf4c8c CM |
343 | } |
344 | ||
563027cc PB |
345 | static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i) |
346 | { | |
347 | memory_region_add_eventfd(&s->ivshmem_mmio, | |
348 | DOORBELL, | |
349 | 4, | |
350 | true, | |
351 | (posn << 16) | i, | |
753d5e14 | 352 | &s->peers[posn].eventfds[i]); |
563027cc PB |
353 | } |
354 | ||
355 | static void ivshmem_del_eventfd(IVShmemState *s, int posn, int i) | |
356 | { | |
357 | memory_region_del_eventfd(&s->ivshmem_mmio, | |
358 | DOORBELL, | |
359 | 4, | |
360 | true, | |
361 | (posn << 16) | i, | |
753d5e14 | 362 | &s->peers[posn].eventfds[i]); |
563027cc PB |
363 | } |
364 | ||
6cbf4c8c CM |
365 | static void close_guest_eventfds(IVShmemState *s, int posn) |
366 | { | |
367 | int i, guest_curr_max; | |
368 | ||
369 | guest_curr_max = s->peers[posn].nb_eventfds; | |
370 | ||
b6a1f3a5 | 371 | memory_region_transaction_begin(); |
6cbf4c8c | 372 | for (i = 0; i < guest_curr_max; i++) { |
563027cc | 373 | ivshmem_del_eventfd(s, posn, i); |
b6a1f3a5 PB |
374 | } |
375 | memory_region_transaction_commit(); | |
376 | for (i = 0; i < guest_curr_max; i++) { | |
563027cc | 377 | event_notifier_cleanup(&s->peers[posn].eventfds[i]); |
6cbf4c8c CM |
378 | } |
379 | ||
7267c094 | 380 | g_free(s->peers[posn].eventfds); |
6cbf4c8c CM |
381 | s->peers[posn].nb_eventfds = 0; |
382 | } | |
383 | ||
384 | static void setup_ioeventfds(IVShmemState *s) { | |
385 | ||
386 | int i, j; | |
387 | ||
388 | for (i = 0; i <= s->max_peer; i++) { | |
389 | for (j = 0; j < s->peers[i].nb_eventfds; j++) { | |
563027cc | 390 | ivshmem_add_eventfd(s, i, j); |
6cbf4c8c CM |
391 | } |
392 | } | |
393 | } | |
394 | ||
395 | /* this function increase the dynamic storage need to store data about other | |
396 | * guests */ | |
397 | static void increase_dynamic_storage(IVShmemState *s, int new_min_size) { | |
398 | ||
399 | int j, old_nb_alloc; | |
400 | ||
401 | old_nb_alloc = s->nb_peers; | |
402 | ||
403 | while (new_min_size >= s->nb_peers) | |
404 | s->nb_peers = s->nb_peers * 2; | |
405 | ||
406 | IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers); | |
7267c094 | 407 | s->peers = g_realloc(s->peers, s->nb_peers * sizeof(Peer)); |
6cbf4c8c CM |
408 | |
409 | /* zero out new pointers */ | |
410 | for (j = old_nb_alloc; j < s->nb_peers; j++) { | |
411 | s->peers[j].eventfds = NULL; | |
412 | s->peers[j].nb_eventfds = 0; | |
413 | } | |
414 | } | |
415 | ||
416 | static void ivshmem_read(void *opaque, const uint8_t * buf, int flags) | |
417 | { | |
418 | IVShmemState *s = opaque; | |
419 | int incoming_fd, tmp_fd; | |
420 | int guest_max_eventfd; | |
421 | long incoming_posn; | |
422 | ||
423 | memcpy(&incoming_posn, buf, sizeof(long)); | |
424 | /* pick off s->server_chr->msgfd and store it, posn should accompany msg */ | |
74c0d6f0 | 425 | tmp_fd = qemu_chr_fe_get_msgfd(s->server_chr); |
6cbf4c8c CM |
426 | IVSHMEM_DPRINTF("posn is %ld, fd is %d\n", incoming_posn, tmp_fd); |
427 | ||
428 | /* make sure we have enough space for this guest */ | |
429 | if (incoming_posn >= s->nb_peers) { | |
430 | increase_dynamic_storage(s, incoming_posn); | |
431 | } | |
432 | ||
433 | if (tmp_fd == -1) { | |
434 | /* if posn is positive and unseen before then this is our posn*/ | |
435 | if ((incoming_posn >= 0) && | |
436 | (s->peers[incoming_posn].eventfds == NULL)) { | |
437 | /* receive our posn */ | |
438 | s->vm_id = incoming_posn; | |
439 | return; | |
440 | } else { | |
441 | /* otherwise an fd == -1 means an existing guest has gone away */ | |
442 | IVSHMEM_DPRINTF("posn %ld has gone away\n", incoming_posn); | |
443 | close_guest_eventfds(s, incoming_posn); | |
444 | return; | |
445 | } | |
446 | } | |
447 | ||
448 | /* because of the implementation of get_msgfd, we need a dup */ | |
449 | incoming_fd = dup(tmp_fd); | |
450 | ||
451 | if (incoming_fd == -1) { | |
452 | fprintf(stderr, "could not allocate file descriptor %s\n", | |
453 | strerror(errno)); | |
454 | return; | |
455 | } | |
456 | ||
457 | /* if the position is -1, then it's shared memory region fd */ | |
458 | if (incoming_posn == -1) { | |
459 | ||
460 | void * map_ptr; | |
461 | ||
462 | s->max_peer = 0; | |
463 | ||
464 | if (check_shm_size(s, incoming_fd) == -1) { | |
465 | exit(-1); | |
466 | } | |
467 | ||
468 | /* mmap the region and map into the BAR2 */ | |
469 | map_ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, | |
470 | incoming_fd, 0); | |
c5705a77 | 471 | memory_region_init_ram_ptr(&s->ivshmem, |
cb06608e | 472 | "ivshmem.bar2", s->ivshmem_size, map_ptr); |
c5705a77 | 473 | vmstate_register_ram(&s->ivshmem, &s->dev.qdev); |
6cbf4c8c | 474 | |
cb06608e | 475 | IVSHMEM_DPRINTF("guest h/w addr = %" PRIu64 ", size = %" PRIu64 "\n", |
6cbf4c8c CM |
476 | s->ivshmem_offset, s->ivshmem_size); |
477 | ||
cb06608e | 478 | memory_region_add_subregion(&s->bar, 0, &s->ivshmem); |
6cbf4c8c CM |
479 | |
480 | /* only store the fd if it is successfully mapped */ | |
481 | s->shm_fd = incoming_fd; | |
482 | ||
483 | return; | |
484 | } | |
485 | ||
486 | /* each guest has an array of eventfds, and we keep track of how many | |
487 | * guests for each VM */ | |
488 | guest_max_eventfd = s->peers[incoming_posn].nb_eventfds; | |
489 | ||
490 | if (guest_max_eventfd == 0) { | |
491 | /* one eventfd per MSI vector */ | |
563027cc | 492 | s->peers[incoming_posn].eventfds = g_new(EventNotifier, s->vectors); |
6cbf4c8c CM |
493 | } |
494 | ||
495 | /* this is an eventfd for a particular guest VM */ | |
496 | IVSHMEM_DPRINTF("eventfds[%ld][%d] = %d\n", incoming_posn, | |
497 | guest_max_eventfd, incoming_fd); | |
563027cc PB |
498 | event_notifier_init_fd(&s->peers[incoming_posn].eventfds[guest_max_eventfd], |
499 | incoming_fd); | |
6cbf4c8c CM |
500 | |
501 | /* increment count for particular guest */ | |
502 | s->peers[incoming_posn].nb_eventfds++; | |
503 | ||
504 | /* keep track of the maximum VM ID */ | |
505 | if (incoming_posn > s->max_peer) { | |
506 | s->max_peer = incoming_posn; | |
507 | } | |
508 | ||
509 | if (incoming_posn == s->vm_id) { | |
510 | s->eventfd_chr[guest_max_eventfd] = create_eventfd_chr_device(s, | |
563027cc | 511 | &s->peers[s->vm_id].eventfds[guest_max_eventfd], |
6cbf4c8c CM |
512 | guest_max_eventfd); |
513 | } | |
514 | ||
515 | if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) { | |
563027cc | 516 | ivshmem_add_eventfd(s, incoming_posn, guest_max_eventfd); |
6cbf4c8c CM |
517 | } |
518 | ||
519 | return; | |
520 | } | |
521 | ||
4490c711 MT |
522 | /* Select the MSI-X vectors used by device. |
523 | * ivshmem maps events to vectors statically, so | |
524 | * we just enable all vectors on init and after reset. */ | |
525 | static void ivshmem_use_msix(IVShmemState * s) | |
526 | { | |
527 | int i; | |
528 | ||
529 | if (!msix_present(&s->dev)) { | |
530 | return; | |
531 | } | |
532 | ||
533 | for (i = 0; i < s->vectors; i++) { | |
534 | msix_vector_use(&s->dev, i); | |
535 | } | |
536 | } | |
537 | ||
6cbf4c8c CM |
538 | static void ivshmem_reset(DeviceState *d) |
539 | { | |
540 | IVShmemState *s = DO_UPCAST(IVShmemState, dev.qdev, d); | |
541 | ||
542 | s->intrstatus = 0; | |
4490c711 | 543 | ivshmem_use_msix(s); |
6cbf4c8c CM |
544 | return; |
545 | } | |
546 | ||
6cbf4c8c CM |
547 | static uint64_t ivshmem_get_size(IVShmemState * s) { |
548 | ||
549 | uint64_t value; | |
550 | char *ptr; | |
551 | ||
552 | value = strtoull(s->sizearg, &ptr, 10); | |
553 | switch (*ptr) { | |
554 | case 0: case 'M': case 'm': | |
555 | value <<= 20; | |
556 | break; | |
557 | case 'G': case 'g': | |
558 | value <<= 30; | |
559 | break; | |
560 | default: | |
561 | fprintf(stderr, "qemu: invalid ram size: %s\n", s->sizearg); | |
562 | exit(1); | |
563 | } | |
564 | ||
565 | /* BARs must be a power of 2 */ | |
566 | if (!is_power_of_two(value)) { | |
567 | fprintf(stderr, "ivshmem: size must be power of 2\n"); | |
568 | exit(1); | |
569 | } | |
570 | ||
571 | return value; | |
572 | } | |
573 | ||
4490c711 MT |
574 | static void ivshmem_setup_msi(IVShmemState * s) |
575 | { | |
1116b539 | 576 | if (msix_init_exclusive_bar(&s->dev, s->vectors, 1)) { |
6cbf4c8c CM |
577 | IVSHMEM_DPRINTF("msix initialization failed\n"); |
578 | exit(1); | |
579 | } | |
580 | ||
1116b539 AW |
581 | IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors); |
582 | ||
5cbdb3a3 | 583 | /* allocate QEMU char devices for receiving interrupts */ |
7267c094 | 584 | s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry)); |
4490c711 MT |
585 | |
586 | ivshmem_use_msix(s); | |
6cbf4c8c CM |
587 | } |
588 | ||
589 | static void ivshmem_save(QEMUFile* f, void *opaque) | |
590 | { | |
591 | IVShmemState *proxy = opaque; | |
592 | ||
593 | IVSHMEM_DPRINTF("ivshmem_save\n"); | |
594 | pci_device_save(&proxy->dev, f); | |
595 | ||
596 | if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) { | |
597 | msix_save(&proxy->dev, f); | |
598 | } else { | |
599 | qemu_put_be32(f, proxy->intrstatus); | |
600 | qemu_put_be32(f, proxy->intrmask); | |
601 | } | |
602 | ||
603 | } | |
604 | ||
605 | static int ivshmem_load(QEMUFile* f, void *opaque, int version_id) | |
606 | { | |
607 | IVSHMEM_DPRINTF("ivshmem_load\n"); | |
608 | ||
609 | IVShmemState *proxy = opaque; | |
4490c711 | 610 | int ret; |
6cbf4c8c CM |
611 | |
612 | if (version_id > 0) { | |
613 | return -EINVAL; | |
614 | } | |
615 | ||
616 | if (proxy->role_val == IVSHMEM_PEER) { | |
617 | fprintf(stderr, "ivshmem: 'peer' devices are not migratable\n"); | |
618 | return -EINVAL; | |
619 | } | |
620 | ||
621 | ret = pci_device_load(&proxy->dev, f); | |
622 | if (ret) { | |
623 | return ret; | |
624 | } | |
625 | ||
626 | if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) { | |
627 | msix_load(&proxy->dev, f); | |
4490c711 | 628 | ivshmem_use_msix(proxy); |
6cbf4c8c CM |
629 | } else { |
630 | proxy->intrstatus = qemu_get_be32(f); | |
631 | proxy->intrmask = qemu_get_be32(f); | |
632 | } | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
4490c711 MT |
637 | static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address, |
638 | uint32_t val, int len) | |
639 | { | |
640 | pci_default_write_config(pci_dev, address, val, len); | |
641 | msix_write_config(pci_dev, address, val, len); | |
642 | } | |
643 | ||
6cbf4c8c CM |
644 | static int pci_ivshmem_init(PCIDevice *dev) |
645 | { | |
646 | IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev); | |
647 | uint8_t *pci_conf; | |
648 | ||
649 | if (s->sizearg == NULL) | |
650 | s->ivshmem_size = 4 << 20; /* 4 MB default */ | |
651 | else { | |
652 | s->ivshmem_size = ivshmem_get_size(s); | |
653 | } | |
654 | ||
655 | register_savevm(&s->dev.qdev, "ivshmem", 0, 0, ivshmem_save, ivshmem_load, | |
656 | dev); | |
657 | ||
658 | /* IRQFD requires MSI */ | |
659 | if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) && | |
660 | !ivshmem_has_feature(s, IVSHMEM_MSI)) { | |
661 | fprintf(stderr, "ivshmem: ioeventfd/irqfd requires MSI\n"); | |
662 | exit(1); | |
663 | } | |
664 | ||
665 | /* check that role is reasonable */ | |
666 | if (s->role) { | |
667 | if (strncmp(s->role, "peer", 5) == 0) { | |
668 | s->role_val = IVSHMEM_PEER; | |
669 | } else if (strncmp(s->role, "master", 7) == 0) { | |
670 | s->role_val = IVSHMEM_MASTER; | |
671 | } else { | |
672 | fprintf(stderr, "ivshmem: 'role' must be 'peer' or 'master'\n"); | |
673 | exit(1); | |
674 | } | |
675 | } else { | |
676 | s->role_val = IVSHMEM_MASTER; /* default */ | |
677 | } | |
678 | ||
679 | if (s->role_val == IVSHMEM_PEER) { | |
c3594ed7 AG |
680 | error_set(&s->migration_blocker, QERR_DEVICE_FEATURE_BLOCKS_MIGRATION, |
681 | "peer mode", "ivshmem"); | |
38e0735e | 682 | migrate_add_blocker(s->migration_blocker); |
6cbf4c8c CM |
683 | } |
684 | ||
685 | pci_conf = s->dev.config; | |
6cbf4c8c | 686 | pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY; |
6cbf4c8c CM |
687 | |
688 | pci_config_set_interrupt_pin(pci_conf, 1); | |
689 | ||
6cbf4c8c CM |
690 | s->shm_fd = 0; |
691 | ||
cb06608e AK |
692 | memory_region_init_io(&s->ivshmem_mmio, &ivshmem_mmio_ops, s, |
693 | "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE); | |
694 | ||
695 | if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) { | |
696 | setup_ioeventfds(s); | |
697 | } | |
698 | ||
6cbf4c8c | 699 | /* region for registers*/ |
e824b2cc AK |
700 | pci_register_bar(&s->dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, |
701 | &s->ivshmem_mmio); | |
cb06608e AK |
702 | |
703 | memory_region_init(&s->bar, "ivshmem-bar2-container", s->ivshmem_size); | |
6cbf4c8c CM |
704 | |
705 | if ((s->server_chr != NULL) && | |
706 | (strncmp(s->server_chr->filename, "unix:", 5) == 0)) { | |
707 | /* if we get a UNIX socket as the parameter we will talk | |
708 | * to the ivshmem server to receive the memory region */ | |
709 | ||
710 | if (s->shmobj != NULL) { | |
711 | fprintf(stderr, "WARNING: do not specify both 'chardev' " | |
712 | "and 'shm' with ivshmem\n"); | |
713 | } | |
714 | ||
715 | IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n", | |
716 | s->server_chr->filename); | |
717 | ||
718 | if (ivshmem_has_feature(s, IVSHMEM_MSI)) { | |
719 | ivshmem_setup_msi(s); | |
720 | } | |
721 | ||
722 | /* we allocate enough space for 16 guests and grow as needed */ | |
723 | s->nb_peers = 16; | |
724 | s->vm_id = -1; | |
725 | ||
726 | /* allocate/initialize space for interrupt handling */ | |
7267c094 | 727 | s->peers = g_malloc0(s->nb_peers * sizeof(Peer)); |
6cbf4c8c | 728 | |
e824b2cc | 729 | pci_register_bar(&s->dev, 2, |
ff51a738 | 730 | PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar); |
6cbf4c8c | 731 | |
7267c094 | 732 | s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *)); |
6cbf4c8c CM |
733 | |
734 | qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read, | |
735 | ivshmem_event, s); | |
736 | } else { | |
737 | /* just map the file immediately, we're not using a server */ | |
738 | int fd; | |
739 | ||
740 | if (s->shmobj == NULL) { | |
741 | fprintf(stderr, "Must specify 'chardev' or 'shm' to ivshmem\n"); | |
742 | } | |
743 | ||
744 | IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj); | |
745 | ||
746 | /* try opening with O_EXCL and if it succeeds zero the memory | |
747 | * by truncating to 0 */ | |
748 | if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR|O_EXCL, | |
749 | S_IRWXU|S_IRWXG|S_IRWXO)) > 0) { | |
750 | /* truncate file to length PCI device's memory */ | |
751 | if (ftruncate(fd, s->ivshmem_size) != 0) { | |
752 | fprintf(stderr, "ivshmem: could not truncate shared file\n"); | |
753 | } | |
754 | ||
755 | } else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR, | |
756 | S_IRWXU|S_IRWXG|S_IRWXO)) < 0) { | |
757 | fprintf(stderr, "ivshmem: could not open shared file\n"); | |
758 | exit(-1); | |
759 | ||
760 | } | |
761 | ||
762 | if (check_shm_size(s, fd) == -1) { | |
763 | exit(-1); | |
764 | } | |
765 | ||
766 | create_shared_memory_BAR(s, fd); | |
767 | ||
768 | } | |
769 | ||
4490c711 MT |
770 | s->dev.config_write = ivshmem_write_config; |
771 | ||
6cbf4c8c CM |
772 | return 0; |
773 | } | |
774 | ||
f90c2bcd | 775 | static void pci_ivshmem_uninit(PCIDevice *dev) |
6cbf4c8c CM |
776 | { |
777 | IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev); | |
778 | ||
38e0735e AL |
779 | if (s->migration_blocker) { |
780 | migrate_del_blocker(s->migration_blocker); | |
781 | error_free(s->migration_blocker); | |
782 | } | |
783 | ||
cb06608e AK |
784 | memory_region_destroy(&s->ivshmem_mmio); |
785 | memory_region_del_subregion(&s->bar, &s->ivshmem); | |
c5705a77 | 786 | vmstate_unregister_ram(&s->ivshmem, &s->dev.qdev); |
cb06608e AK |
787 | memory_region_destroy(&s->ivshmem); |
788 | memory_region_destroy(&s->bar); | |
6cbf4c8c | 789 | unregister_savevm(&dev->qdev, "ivshmem", s); |
6cbf4c8c CM |
790 | } |
791 | ||
40021f08 AL |
792 | static Property ivshmem_properties[] = { |
793 | DEFINE_PROP_CHR("chardev", IVShmemState, server_chr), | |
794 | DEFINE_PROP_STRING("size", IVShmemState, sizearg), | |
795 | DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1), | |
796 | DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD, false), | |
797 | DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true), | |
798 | DEFINE_PROP_STRING("shm", IVShmemState, shmobj), | |
799 | DEFINE_PROP_STRING("role", IVShmemState, role), | |
800 | DEFINE_PROP_END_OF_LIST(), | |
801 | }; | |
802 | ||
803 | static void ivshmem_class_init(ObjectClass *klass, void *data) | |
804 | { | |
39bffca2 | 805 | DeviceClass *dc = DEVICE_CLASS(klass); |
40021f08 AL |
806 | PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
807 | ||
808 | k->init = pci_ivshmem_init; | |
809 | k->exit = pci_ivshmem_uninit; | |
810 | k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; | |
811 | k->device_id = 0x1110; | |
812 | k->class_id = PCI_CLASS_MEMORY_RAM; | |
39bffca2 AL |
813 | dc->reset = ivshmem_reset; |
814 | dc->props = ivshmem_properties; | |
40021f08 AL |
815 | } |
816 | ||
39bffca2 AL |
817 | static TypeInfo ivshmem_info = { |
818 | .name = "ivshmem", | |
819 | .parent = TYPE_PCI_DEVICE, | |
820 | .instance_size = sizeof(IVShmemState), | |
821 | .class_init = ivshmem_class_init, | |
6cbf4c8c CM |
822 | }; |
823 | ||
83f7d43a | 824 | static void ivshmem_register_types(void) |
6cbf4c8c | 825 | { |
39bffca2 | 826 | type_register_static(&ivshmem_info); |
6cbf4c8c CM |
827 | } |
828 | ||
83f7d43a | 829 | type_init(ivshmem_register_types) |