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1.1 root 1: /*
2: * Inter-VM Shared Memory PCI device.
3: *
4: * Author:
5: * Cam Macdonell <[email protected]>
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.
1.1.1.5 ! root 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.
1.1 root 18: */
19: #include "hw.h"
20: #include "pc.h"
21: #include "pci.h"
22: #include "msix.h"
23: #include "kvm.h"
1.1.1.4 root 24: #include "migration.h"
25: #include "qerror.h"
1.1 root 26:
27: #include <sys/mman.h>
28: #include <sys/types.h>
29:
30: #define IVSHMEM_IOEVENTFD 0
31: #define IVSHMEM_MSI 1
32:
33: #define IVSHMEM_PEER 0
34: #define IVSHMEM_MASTER 1
35:
36: #define IVSHMEM_REG_BAR_SIZE 0x100
37:
38: //#define DEBUG_IVSHMEM
39: #ifdef DEBUG_IVSHMEM
40: #define IVSHMEM_DPRINTF(fmt, ...) \
41: do {printf("IVSHMEM: " fmt, ## __VA_ARGS__); } while (0)
42: #else
43: #define IVSHMEM_DPRINTF(fmt, ...)
44: #endif
45:
46: typedef struct Peer {
47: int nb_eventfds;
48: int *eventfds;
49: } Peer;
50:
51: typedef struct EventfdEntry {
52: PCIDevice *pdev;
53: int vector;
54: } EventfdEntry;
55:
56: typedef struct IVShmemState {
57: PCIDevice dev;
58: uint32_t intrmask;
59: uint32_t intrstatus;
60: uint32_t doorbell;
61:
62: CharDriverState **eventfd_chr;
63: CharDriverState *server_chr;
1.1.1.4 root 64: MemoryRegion ivshmem_mmio;
1.1 root 65:
66: pcibus_t mmio_addr;
1.1.1.4 root 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;
73: MemoryRegion msix_bar;
1.1 root 74: uint64_t ivshmem_size; /* size of shared memory region */
75: int shm_fd; /* shared memory file descriptor */
76:
77: Peer *peers;
78: int nb_peers; /* how many guests we have space for */
79: int max_peer; /* maximum numbered peer */
80:
81: int vm_id;
82: uint32_t vectors;
83: uint32_t features;
84: EventfdEntry *eventfd_table;
85:
1.1.1.4 root 86: Error *migration_blocker;
87:
1.1 root 88: char * shmobj;
89: char * sizearg;
90: char * role;
91: int role_val; /* scalar to avoid multiple string comparisons */
92: } IVShmemState;
93:
94: /* registers for the Inter-VM shared memory device */
95: enum ivshmem_registers {
96: INTRMASK = 0,
97: INTRSTATUS = 4,
98: IVPOSITION = 8,
99: DOORBELL = 12,
100: };
101:
102: static inline uint32_t ivshmem_has_feature(IVShmemState *ivs,
103: unsigned int feature) {
104: return (ivs->features & (1 << feature));
105: }
106:
107: static inline bool is_power_of_two(uint64_t x) {
108: return (x & (x - 1)) == 0;
109: }
110:
111: /* accessing registers - based on rtl8139 */
112: static void ivshmem_update_irq(IVShmemState *s, int val)
113: {
114: int isr;
115: isr = (s->intrstatus & s->intrmask) & 0xffffffff;
116:
117: /* don't print ISR resets */
118: if (isr) {
119: IVSHMEM_DPRINTF("Set IRQ to %d (%04x %04x)\n",
120: isr ? 1 : 0, s->intrstatus, s->intrmask);
121: }
122:
123: qemu_set_irq(s->dev.irq[0], (isr != 0));
124: }
125:
126: static void ivshmem_IntrMask_write(IVShmemState *s, uint32_t val)
127: {
128: IVSHMEM_DPRINTF("IntrMask write(w) val = 0x%04x\n", val);
129:
130: s->intrmask = val;
131:
132: ivshmem_update_irq(s, val);
133: }
134:
135: static uint32_t ivshmem_IntrMask_read(IVShmemState *s)
136: {
137: uint32_t ret = s->intrmask;
138:
139: IVSHMEM_DPRINTF("intrmask read(w) val = 0x%04x\n", ret);
140:
141: return ret;
142: }
143:
144: static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val)
145: {
146: IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val);
147:
148: s->intrstatus = val;
149:
150: ivshmem_update_irq(s, val);
151: return;
152: }
153:
154: static uint32_t ivshmem_IntrStatus_read(IVShmemState *s)
155: {
156: uint32_t ret = s->intrstatus;
157:
158: /* reading ISR clears all interrupts */
159: s->intrstatus = 0;
160:
161: ivshmem_update_irq(s, 0);
162:
163: return ret;
164: }
165:
1.1.1.4 root 166: static void ivshmem_io_write(void *opaque, target_phys_addr_t addr,
167: uint64_t val, unsigned size)
1.1 root 168: {
169: IVShmemState *s = opaque;
170:
171: uint64_t write_one = 1;
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("Writing %" PRId64 " to VM %d on vector %d\n",
198: write_one, dest, vector);
199: if (write(s->peers[dest].eventfds[vector],
200: &(write_one), 8) != 8) {
201: IVSHMEM_DPRINTF("error writing to eventfd\n");
202: }
203: }
204: break;
205: default:
206: IVSHMEM_DPRINTF("Invalid VM Doorbell VM %d\n", dest);
207: }
208: }
209:
1.1.1.4 root 210: static uint64_t ivshmem_io_read(void *opaque, target_phys_addr_t addr,
211: unsigned size)
1.1 root 212: {
213:
214: IVShmemState *s = opaque;
215: uint32_t ret;
216:
217: switch (addr)
218: {
219: case INTRMASK:
220: ret = ivshmem_IntrMask_read(s);
221: break;
222:
223: case INTRSTATUS:
224: ret = ivshmem_IntrStatus_read(s);
225: break;
226:
227: case IVPOSITION:
228: /* return my VM ID if the memory is mapped */
229: if (s->shm_fd > 0) {
230: ret = s->vm_id;
231: } else {
232: ret = -1;
233: }
234: break;
235:
236: default:
237: IVSHMEM_DPRINTF("why are we reading " TARGET_FMT_plx "\n", addr);
238: ret = 0;
239: }
240:
241: return ret;
242: }
243:
1.1.1.4 root 244: static const MemoryRegionOps ivshmem_mmio_ops = {
245: .read = ivshmem_io_read,
246: .write = ivshmem_io_write,
247: .endianness = DEVICE_NATIVE_ENDIAN,
248: .impl = {
249: .min_access_size = 4,
250: .max_access_size = 4,
251: },
1.1 root 252: };
253:
254: static void ivshmem_receive(void *opaque, const uint8_t *buf, int size)
255: {
256: IVShmemState *s = opaque;
257:
258: ivshmem_IntrStatus_write(s, *buf);
259:
260: IVSHMEM_DPRINTF("ivshmem_receive 0x%02x\n", *buf);
261: }
262:
263: static int ivshmem_can_receive(void * opaque)
264: {
265: return 8;
266: }
267:
268: static void ivshmem_event(void *opaque, int event)
269: {
270: IVSHMEM_DPRINTF("ivshmem_event %d\n", event);
271: }
272:
273: static void fake_irqfd(void *opaque, const uint8_t *buf, int size) {
274:
275: EventfdEntry *entry = opaque;
276: PCIDevice *pdev = entry->pdev;
277:
278: IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, entry->vector);
279: msix_notify(pdev, entry->vector);
280: }
281:
282: static CharDriverState* create_eventfd_chr_device(void * opaque, int eventfd,
283: int vector)
284: {
285: /* create a event character device based on the passed eventfd */
286: IVShmemState *s = opaque;
287: CharDriverState * chr;
288:
289: chr = qemu_chr_open_eventfd(eventfd);
290:
291: if (chr == NULL) {
292: fprintf(stderr, "creating eventfd for eventfd %d failed\n", eventfd);
293: exit(-1);
294: }
295:
296: /* if MSI is supported we need multiple interrupts */
297: if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
298: s->eventfd_table[vector].pdev = &s->dev;
299: s->eventfd_table[vector].vector = vector;
300:
301: qemu_chr_add_handlers(chr, ivshmem_can_receive, fake_irqfd,
302: ivshmem_event, &s->eventfd_table[vector]);
303: } else {
304: qemu_chr_add_handlers(chr, ivshmem_can_receive, ivshmem_receive,
305: ivshmem_event, s);
306: }
307:
308: return chr;
309:
310: }
311:
312: static int check_shm_size(IVShmemState *s, int fd) {
313: /* check that the guest isn't going to try and map more memory than the
314: * the object has allocated return -1 to indicate error */
315:
316: struct stat buf;
317:
318: fstat(fd, &buf);
319:
320: if (s->ivshmem_size > buf.st_size) {
321: fprintf(stderr,
322: "IVSHMEM ERROR: Requested memory size greater"
323: " than shared object size (%" PRIu64 " > %" PRIu64")\n",
324: s->ivshmem_size, (uint64_t)buf.st_size);
325: return -1;
326: } else {
327: return 0;
328: }
329: }
330:
331: /* create the shared memory BAR when we are not using the server, so we can
332: * create the BAR and map the memory immediately */
333: static void create_shared_memory_BAR(IVShmemState *s, int fd) {
334:
335: void * ptr;
336:
337: s->shm_fd = fd;
338:
339: ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
340:
1.1.1.5 ! root 341: memory_region_init_ram_ptr(&s->ivshmem, "ivshmem.bar2",
1.1.1.4 root 342: s->ivshmem_size, ptr);
1.1.1.5 ! root 343: vmstate_register_ram(&s->ivshmem, &s->dev.qdev);
1.1.1.4 root 344: memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
1.1 root 345:
346: /* region for shared memory */
1.1.1.4 root 347: pci_register_bar(&s->dev, 2, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar);
1.1 root 348: }
349:
350: static void close_guest_eventfds(IVShmemState *s, int posn)
351: {
352: int i, guest_curr_max;
353:
354: guest_curr_max = s->peers[posn].nb_eventfds;
355:
356: for (i = 0; i < guest_curr_max; i++) {
1.1.1.5 ! root 357: kvm_set_ioeventfd_mmio(s->peers[posn].eventfds[i],
! 358: s->mmio_addr + DOORBELL, (posn << 16) | i, 0, 4);
1.1 root 359: close(s->peers[posn].eventfds[i]);
360: }
361:
1.1.1.4 root 362: g_free(s->peers[posn].eventfds);
1.1 root 363: s->peers[posn].nb_eventfds = 0;
364: }
365:
366: static void setup_ioeventfds(IVShmemState *s) {
367:
368: int i, j;
369:
370: for (i = 0; i <= s->max_peer; i++) {
371: for (j = 0; j < s->peers[i].nb_eventfds; j++) {
1.1.1.4 root 372: memory_region_add_eventfd(&s->ivshmem_mmio,
373: DOORBELL,
374: 4,
375: true,
376: (i << 16) | j,
377: s->peers[i].eventfds[j]);
1.1 root 378: }
379: }
380: }
381:
382: /* this function increase the dynamic storage need to store data about other
383: * guests */
384: static void increase_dynamic_storage(IVShmemState *s, int new_min_size) {
385:
386: int j, old_nb_alloc;
387:
388: old_nb_alloc = s->nb_peers;
389:
390: while (new_min_size >= s->nb_peers)
391: s->nb_peers = s->nb_peers * 2;
392:
393: IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers);
1.1.1.4 root 394: s->peers = g_realloc(s->peers, s->nb_peers * sizeof(Peer));
1.1 root 395:
396: /* zero out new pointers */
397: for (j = old_nb_alloc; j < s->nb_peers; j++) {
398: s->peers[j].eventfds = NULL;
399: s->peers[j].nb_eventfds = 0;
400: }
401: }
402:
403: static void ivshmem_read(void *opaque, const uint8_t * buf, int flags)
404: {
405: IVShmemState *s = opaque;
406: int incoming_fd, tmp_fd;
407: int guest_max_eventfd;
408: long incoming_posn;
409:
410: memcpy(&incoming_posn, buf, sizeof(long));
411: /* pick off s->server_chr->msgfd and store it, posn should accompany msg */
1.1.1.4 root 412: tmp_fd = qemu_chr_fe_get_msgfd(s->server_chr);
1.1 root 413: IVSHMEM_DPRINTF("posn is %ld, fd is %d\n", incoming_posn, tmp_fd);
414:
415: /* make sure we have enough space for this guest */
416: if (incoming_posn >= s->nb_peers) {
417: increase_dynamic_storage(s, incoming_posn);
418: }
419:
420: if (tmp_fd == -1) {
421: /* if posn is positive and unseen before then this is our posn*/
422: if ((incoming_posn >= 0) &&
423: (s->peers[incoming_posn].eventfds == NULL)) {
424: /* receive our posn */
425: s->vm_id = incoming_posn;
426: return;
427: } else {
428: /* otherwise an fd == -1 means an existing guest has gone away */
429: IVSHMEM_DPRINTF("posn %ld has gone away\n", incoming_posn);
430: close_guest_eventfds(s, incoming_posn);
431: return;
432: }
433: }
434:
435: /* because of the implementation of get_msgfd, we need a dup */
436: incoming_fd = dup(tmp_fd);
437:
438: if (incoming_fd == -1) {
439: fprintf(stderr, "could not allocate file descriptor %s\n",
440: strerror(errno));
441: return;
442: }
443:
444: /* if the position is -1, then it's shared memory region fd */
445: if (incoming_posn == -1) {
446:
447: void * map_ptr;
448:
449: s->max_peer = 0;
450:
451: if (check_shm_size(s, incoming_fd) == -1) {
452: exit(-1);
453: }
454:
455: /* mmap the region and map into the BAR2 */
456: map_ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED,
457: incoming_fd, 0);
1.1.1.5 ! root 458: memory_region_init_ram_ptr(&s->ivshmem,
1.1.1.4 root 459: "ivshmem.bar2", s->ivshmem_size, map_ptr);
1.1.1.5 ! root 460: vmstate_register_ram(&s->ivshmem, &s->dev.qdev);
1.1 root 461:
1.1.1.4 root 462: IVSHMEM_DPRINTF("guest h/w addr = %" PRIu64 ", size = %" PRIu64 "\n",
1.1 root 463: s->ivshmem_offset, s->ivshmem_size);
464:
1.1.1.4 root 465: memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
1.1 root 466:
467: /* only store the fd if it is successfully mapped */
468: s->shm_fd = incoming_fd;
469:
470: return;
471: }
472:
473: /* each guest has an array of eventfds, and we keep track of how many
474: * guests for each VM */
475: guest_max_eventfd = s->peers[incoming_posn].nb_eventfds;
476:
477: if (guest_max_eventfd == 0) {
478: /* one eventfd per MSI vector */
1.1.1.4 root 479: s->peers[incoming_posn].eventfds = (int *) g_malloc(s->vectors *
1.1 root 480: sizeof(int));
481: }
482:
483: /* this is an eventfd for a particular guest VM */
484: IVSHMEM_DPRINTF("eventfds[%ld][%d] = %d\n", incoming_posn,
485: guest_max_eventfd, incoming_fd);
486: s->peers[incoming_posn].eventfds[guest_max_eventfd] = incoming_fd;
487:
488: /* increment count for particular guest */
489: s->peers[incoming_posn].nb_eventfds++;
490:
491: /* keep track of the maximum VM ID */
492: if (incoming_posn > s->max_peer) {
493: s->max_peer = incoming_posn;
494: }
495:
496: if (incoming_posn == s->vm_id) {
497: s->eventfd_chr[guest_max_eventfd] = create_eventfd_chr_device(s,
498: s->peers[s->vm_id].eventfds[guest_max_eventfd],
499: guest_max_eventfd);
500: }
501:
502: if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
1.1.1.5 ! root 503: if (kvm_set_ioeventfd_mmio(incoming_fd, s->mmio_addr + DOORBELL,
! 504: (incoming_posn << 16) | guest_max_eventfd, 1, 4) < 0) {
1.1 root 505: fprintf(stderr, "ivshmem: ioeventfd not available\n");
506: }
507: }
508:
509: return;
510: }
511:
1.1.1.5 ! root 512: /* Select the MSI-X vectors used by device.
! 513: * ivshmem maps events to vectors statically, so
! 514: * we just enable all vectors on init and after reset. */
! 515: static void ivshmem_use_msix(IVShmemState * s)
! 516: {
! 517: int i;
! 518:
! 519: if (!msix_present(&s->dev)) {
! 520: return;
! 521: }
! 522:
! 523: for (i = 0; i < s->vectors; i++) {
! 524: msix_vector_use(&s->dev, i);
! 525: }
! 526: }
! 527:
1.1 root 528: static void ivshmem_reset(DeviceState *d)
529: {
530: IVShmemState *s = DO_UPCAST(IVShmemState, dev.qdev, d);
531:
532: s->intrstatus = 0;
1.1.1.5 ! root 533: msix_reset(&s->dev);
! 534: ivshmem_use_msix(s);
1.1 root 535: return;
536: }
537:
538: static uint64_t ivshmem_get_size(IVShmemState * s) {
539:
540: uint64_t value;
541: char *ptr;
542:
543: value = strtoull(s->sizearg, &ptr, 10);
544: switch (*ptr) {
545: case 0: case 'M': case 'm':
546: value <<= 20;
547: break;
548: case 'G': case 'g':
549: value <<= 30;
550: break;
551: default:
552: fprintf(stderr, "qemu: invalid ram size: %s\n", s->sizearg);
553: exit(1);
554: }
555:
556: /* BARs must be a power of 2 */
557: if (!is_power_of_two(value)) {
558: fprintf(stderr, "ivshmem: size must be power of 2\n");
559: exit(1);
560: }
561:
562: return value;
563: }
564:
1.1.1.5 ! root 565: static void ivshmem_setup_msi(IVShmemState * s)
! 566: {
1.1.1.4 root 567: memory_region_init(&s->msix_bar, "ivshmem-msix", 4096);
568: if (!msix_init(&s->dev, s->vectors, &s->msix_bar, 1, 0)) {
569: pci_register_bar(&s->dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY,
570: &s->msix_bar);
1.1 root 571: IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
572: } else {
573: IVSHMEM_DPRINTF("msix initialization failed\n");
574: exit(1);
575: }
576:
1.1.1.5 ! root 577: /* allocate QEMU char devices for receiving interrupts */
1.1.1.4 root 578: s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry));
1.1.1.5 ! root 579:
! 580: ivshmem_use_msix(s);
1.1 root 581: }
582:
583: static void ivshmem_save(QEMUFile* f, void *opaque)
584: {
585: IVShmemState *proxy = opaque;
586:
587: IVSHMEM_DPRINTF("ivshmem_save\n");
588: pci_device_save(&proxy->dev, f);
589:
590: if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
591: msix_save(&proxy->dev, f);
592: } else {
593: qemu_put_be32(f, proxy->intrstatus);
594: qemu_put_be32(f, proxy->intrmask);
595: }
596:
597: }
598:
599: static int ivshmem_load(QEMUFile* f, void *opaque, int version_id)
600: {
601: IVSHMEM_DPRINTF("ivshmem_load\n");
602:
603: IVShmemState *proxy = opaque;
1.1.1.5 ! root 604: int ret;
1.1 root 605:
606: if (version_id > 0) {
607: return -EINVAL;
608: }
609:
610: if (proxy->role_val == IVSHMEM_PEER) {
611: fprintf(stderr, "ivshmem: 'peer' devices are not migratable\n");
612: return -EINVAL;
613: }
614:
615: ret = pci_device_load(&proxy->dev, f);
616: if (ret) {
617: return ret;
618: }
619:
620: if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
621: msix_load(&proxy->dev, f);
1.1.1.5 ! root 622: ivshmem_use_msix(proxy);
1.1 root 623: } else {
624: proxy->intrstatus = qemu_get_be32(f);
625: proxy->intrmask = qemu_get_be32(f);
626: }
627:
628: return 0;
629: }
630:
1.1.1.5 ! root 631: static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address,
! 632: uint32_t val, int len)
! 633: {
! 634: pci_default_write_config(pci_dev, address, val, len);
! 635: msix_write_config(pci_dev, address, val, len);
! 636: }
! 637:
1.1 root 638: static int pci_ivshmem_init(PCIDevice *dev)
639: {
640: IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
641: uint8_t *pci_conf;
642:
643: if (s->sizearg == NULL)
644: s->ivshmem_size = 4 << 20; /* 4 MB default */
645: else {
646: s->ivshmem_size = ivshmem_get_size(s);
647: }
648:
649: register_savevm(&s->dev.qdev, "ivshmem", 0, 0, ivshmem_save, ivshmem_load,
650: dev);
651:
652: /* IRQFD requires MSI */
653: if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
654: !ivshmem_has_feature(s, IVSHMEM_MSI)) {
655: fprintf(stderr, "ivshmem: ioeventfd/irqfd requires MSI\n");
656: exit(1);
657: }
658:
659: /* check that role is reasonable */
660: if (s->role) {
661: if (strncmp(s->role, "peer", 5) == 0) {
662: s->role_val = IVSHMEM_PEER;
663: } else if (strncmp(s->role, "master", 7) == 0) {
664: s->role_val = IVSHMEM_MASTER;
665: } else {
666: fprintf(stderr, "ivshmem: 'role' must be 'peer' or 'master'\n");
667: exit(1);
668: }
669: } else {
670: s->role_val = IVSHMEM_MASTER; /* default */
671: }
672:
673: if (s->role_val == IVSHMEM_PEER) {
1.1.1.4 root 674: error_set(&s->migration_blocker, QERR_DEVICE_FEATURE_BLOCKS_MIGRATION, "ivshmem", "peer mode");
675: migrate_add_blocker(s->migration_blocker);
1.1 root 676: }
677:
678: pci_conf = s->dev.config;
679: pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
680:
681: pci_config_set_interrupt_pin(pci_conf, 1);
682:
683: s->shm_fd = 0;
684:
1.1.1.4 root 685: memory_region_init_io(&s->ivshmem_mmio, &ivshmem_mmio_ops, s,
686: "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE);
687:
688: if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
689: setup_ioeventfds(s);
690: }
691:
1.1 root 692: /* region for registers*/
1.1.1.4 root 693: pci_register_bar(&s->dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY,
694: &s->ivshmem_mmio);
695:
696: memory_region_init(&s->bar, "ivshmem-bar2-container", s->ivshmem_size);
1.1 root 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 */
1.1.1.4 root 720: s->peers = g_malloc0(s->nb_peers * sizeof(Peer));
1.1 root 721:
1.1.1.4 root 722: pci_register_bar(&s->dev, 2,
723: PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar);
1.1 root 724:
1.1.1.4 root 725: s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *));
1.1 root 726:
727: qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read,
728: ivshmem_event, s);
729: } else {
730: /* just map the file immediately, we're not using a server */
731: int fd;
732:
733: if (s->shmobj == NULL) {
734: fprintf(stderr, "Must specify 'chardev' or 'shm' to ivshmem\n");
735: }
736:
737: IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj);
738:
739: /* try opening with O_EXCL and if it succeeds zero the memory
740: * by truncating to 0 */
741: if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR|O_EXCL,
742: S_IRWXU|S_IRWXG|S_IRWXO)) > 0) {
743: /* truncate file to length PCI device's memory */
744: if (ftruncate(fd, s->ivshmem_size) != 0) {
745: fprintf(stderr, "ivshmem: could not truncate shared file\n");
746: }
747:
748: } else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR,
749: S_IRWXU|S_IRWXG|S_IRWXO)) < 0) {
750: fprintf(stderr, "ivshmem: could not open shared file\n");
751: exit(-1);
752:
753: }
754:
755: if (check_shm_size(s, fd) == -1) {
756: exit(-1);
757: }
758:
759: create_shared_memory_BAR(s, fd);
760:
761: }
762:
1.1.1.5 ! root 763: s->dev.config_write = ivshmem_write_config;
! 764:
1.1 root 765: return 0;
766: }
767:
768: static int pci_ivshmem_uninit(PCIDevice *dev)
769: {
770: IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
771:
1.1.1.4 root 772: if (s->migration_blocker) {
773: migrate_del_blocker(s->migration_blocker);
774: error_free(s->migration_blocker);
775: }
776:
777: memory_region_destroy(&s->ivshmem_mmio);
778: memory_region_del_subregion(&s->bar, &s->ivshmem);
1.1.1.5 ! root 779: vmstate_unregister_ram(&s->ivshmem, &s->dev.qdev);
1.1.1.4 root 780: memory_region_destroy(&s->ivshmem);
781: memory_region_destroy(&s->bar);
1.1 root 782: unregister_savevm(&dev->qdev, "ivshmem", s);
783:
784: return 0;
785: }
786:
1.1.1.5 ! root 787: static Property ivshmem_properties[] = {
! 788: DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
! 789: DEFINE_PROP_STRING("size", IVShmemState, sizearg),
! 790: DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
! 791: DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD, false),
! 792: DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true),
! 793: DEFINE_PROP_STRING("shm", IVShmemState, shmobj),
! 794: DEFINE_PROP_STRING("role", IVShmemState, role),
! 795: DEFINE_PROP_END_OF_LIST(),
! 796: };
! 797:
! 798: static void ivshmem_class_init(ObjectClass *klass, void *data)
! 799: {
! 800: DeviceClass *dc = DEVICE_CLASS(klass);
! 801: PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
! 802:
! 803: k->init = pci_ivshmem_init;
! 804: k->exit = pci_ivshmem_uninit;
! 805: k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
! 806: k->device_id = 0x1110;
! 807: k->class_id = PCI_CLASS_MEMORY_RAM;
! 808: dc->reset = ivshmem_reset;
! 809: dc->props = ivshmem_properties;
! 810: }
! 811:
! 812: static TypeInfo ivshmem_info = {
! 813: .name = "ivshmem",
! 814: .parent = TYPE_PCI_DEVICE,
! 815: .instance_size = sizeof(IVShmemState),
! 816: .class_init = ivshmem_class_init,
1.1 root 817: };
818:
1.1.1.5 ! root 819: static void ivshmem_register_types(void)
1.1 root 820: {
1.1.1.5 ! root 821: type_register_static(&ivshmem_info);
1.1 root 822: }
823:
1.1.1.5 ! root 824: type_init(ivshmem_register_types)
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