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qapi: fix example of dump-guest-memory
[qemu/armbru.git] / hw / virtio / virtio-pci.c
blob7cf1231c1c5573cc3d5636cd6db53fd87593932b
1 /*
2 * Virtio PCI Bindings
3 *
4 * Copyright IBM, Corp. 2007
5 * Copyright (c) 2009 CodeSourcery
6 *
7 * Authors:
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Paul Brook <paul@codesourcery.com>
10 *
11 * This work is licensed under the terms of the GNU GPL, version 2. See
12 * the COPYING file in the top-level directory.
13 *
14 * Contributions after 2012-01-13 are licensed under the terms of the
15 * GNU GPL, version 2 or (at your option) any later version.
16 */
17
18 #include "qemu/osdep.h"
19
20 #include "exec/memop.h"
21 #include "standard-headers/linux/virtio_pci.h"
22 #include "hw/boards.h"
23 #include "hw/virtio/virtio.h"
24 #include "migration/qemu-file-types.h"
25 #include "hw/pci/pci.h"
26 #include "hw/pci/pci_bus.h"
27 #include "hw/qdev-properties.h"
28 #include "qapi/error.h"
29 #include "qemu/error-report.h"
30 #include "qemu/log.h"
31 #include "qemu/module.h"
32 #include "hw/pci/msi.h"
33 #include "hw/pci/msix.h"
34 #include "hw/loader.h"
35 #include "sysemu/kvm.h"
36 #include "virtio-pci.h"
37 #include "qemu/range.h"
38 #include "hw/virtio/virtio-bus.h"
39 #include "qapi/visitor.h"
40 #include "sysemu/replay.h"
41
42 #define VIRTIO_PCI_REGION_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_present(dev))
43
44 #undef VIRTIO_PCI_CONFIG
45
46 /* The remaining space is defined by each driver as the per-driver
47 * configuration space */
48 #define VIRTIO_PCI_CONFIG_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_enabled(dev))
49
50 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
51 VirtIOPCIProxy *dev);
52 static void virtio_pci_reset(DeviceState *qdev);
53
54 /* virtio device */
55 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */
56 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d)
57 {
58 return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
59 }
60
61 /* DeviceState to VirtIOPCIProxy. Note: used on datapath,
62 * be careful and test performance if you change this.
63 */
64 static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d)
65 {
66 return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
67 }
68
69 static void virtio_pci_notify(DeviceState *d, uint16_t vector)
70 {
71 VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d);
72
73 if (msix_enabled(&proxy->pci_dev))
74 msix_notify(&proxy->pci_dev, vector);
75 else {
76 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
77 pci_set_irq(&proxy->pci_dev, qatomic_read(&vdev->isr) & 1);
78 }
79 }
80
81 static void virtio_pci_save_config(DeviceState *d, QEMUFile *f)
82 {
83 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
84 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
85
86 pci_device_save(&proxy->pci_dev, f);
87 msix_save(&proxy->pci_dev, f);
88 if (msix_present(&proxy->pci_dev))
89 qemu_put_be16(f, vdev->config_vector);
90 }
91
92 static const VMStateDescription vmstate_virtio_pci_modern_queue_state = {
93 .name = "virtio_pci/modern_queue_state",
94 .version_id = 1,
95 .minimum_version_id = 1,
96 .fields = (VMStateField[]) {
97 VMSTATE_UINT16(num, VirtIOPCIQueue),
98 VMSTATE_UNUSED(1), /* enabled was stored as be16 */
99 VMSTATE_BOOL(enabled, VirtIOPCIQueue),
100 VMSTATE_UINT32_ARRAY(desc, VirtIOPCIQueue, 2),
101 VMSTATE_UINT32_ARRAY(avail, VirtIOPCIQueue, 2),
102 VMSTATE_UINT32_ARRAY(used, VirtIOPCIQueue, 2),
103 VMSTATE_END_OF_LIST()
104 }
105 };
106
107 static bool virtio_pci_modern_state_needed(void *opaque)
108 {
109 VirtIOPCIProxy *proxy = opaque;
110
111 return virtio_pci_modern(proxy);
112 }
113
114 static const VMStateDescription vmstate_virtio_pci_modern_state_sub = {
115 .name = "virtio_pci/modern_state",
116 .version_id = 1,
117 .minimum_version_id = 1,
118 .needed = &virtio_pci_modern_state_needed,
119 .fields = (VMStateField[]) {
120 VMSTATE_UINT32(dfselect, VirtIOPCIProxy),
121 VMSTATE_UINT32(gfselect, VirtIOPCIProxy),
122 VMSTATE_UINT32_ARRAY(guest_features, VirtIOPCIProxy, 2),
123 VMSTATE_STRUCT_ARRAY(vqs, VirtIOPCIProxy, VIRTIO_QUEUE_MAX, 0,
124 vmstate_virtio_pci_modern_queue_state,
125 VirtIOPCIQueue),
126 VMSTATE_END_OF_LIST()
127 }
128 };
129
130 static const VMStateDescription vmstate_virtio_pci = {
131 .name = "virtio_pci",
132 .version_id = 1,
133 .minimum_version_id = 1,
134 .fields = (VMStateField[]) {
135 VMSTATE_END_OF_LIST()
136 },
137 .subsections = (const VMStateDescription*[]) {
138 &vmstate_virtio_pci_modern_state_sub,
139 NULL
140 }
141 };
142
143 static bool virtio_pci_has_extra_state(DeviceState *d)
144 {
145 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
146
147 return proxy->flags & VIRTIO_PCI_FLAG_MIGRATE_EXTRA;
148 }
149
150 static void virtio_pci_save_extra_state(DeviceState *d, QEMUFile *f)
151 {
152 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
153
154 vmstate_save_state(f, &vmstate_virtio_pci, proxy, NULL);
155 }
156
157 static int virtio_pci_load_extra_state(DeviceState *d, QEMUFile *f)
158 {
159 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
160
161 return vmstate_load_state(f, &vmstate_virtio_pci, proxy, 1);
162 }
163
164 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f)
165 {
166 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
167 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
168
169 if (msix_present(&proxy->pci_dev))
170 qemu_put_be16(f, virtio_queue_vector(vdev, n));
171 }
172
173 static int virtio_pci_load_config(DeviceState *d, QEMUFile *f)
174 {
175 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
176 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
177
178 int ret;
179 ret = pci_device_load(&proxy->pci_dev, f);
180 if (ret) {
181 return ret;
182 }
183 msix_unuse_all_vectors(&proxy->pci_dev);
184 msix_load(&proxy->pci_dev, f);
185 if (msix_present(&proxy->pci_dev)) {
186 qemu_get_be16s(f, &vdev->config_vector);
187 } else {
188 vdev->config_vector = VIRTIO_NO_VECTOR;
189 }
190 if (vdev->config_vector != VIRTIO_NO_VECTOR) {
191 return msix_vector_use(&proxy->pci_dev, vdev->config_vector);
192 }
193 return 0;
194 }
195
196 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f)
197 {
198 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
199 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
200
201 uint16_t vector;
202 if (msix_present(&proxy->pci_dev)) {
203 qemu_get_be16s(f, &vector);
204 } else {
205 vector = VIRTIO_NO_VECTOR;
206 }
207 virtio_queue_set_vector(vdev, n, vector);
208 if (vector != VIRTIO_NO_VECTOR) {
209 return msix_vector_use(&proxy->pci_dev, vector);
210 }
211
212 return 0;
213 }
214
215 static bool virtio_pci_ioeventfd_enabled(DeviceState *d)
216 {
217 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
218
219 return (proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) != 0;
220 }
221
222 #define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000
223
224 static inline int virtio_pci_queue_mem_mult(struct VirtIOPCIProxy *proxy)
225 {
226 return (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ) ?
227 QEMU_VIRTIO_PCI_QUEUE_MEM_MULT : 4;
228 }
229
230 static int virtio_pci_ioeventfd_assign(DeviceState *d, EventNotifier *notifier,
231 int n, bool assign)
232 {
233 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
234 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
235 VirtQueue *vq = virtio_get_queue(vdev, n);
236 bool legacy = virtio_pci_legacy(proxy);
237 bool modern = virtio_pci_modern(proxy);
238 bool fast_mmio = kvm_ioeventfd_any_length_enabled();
239 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
240 MemoryRegion *modern_mr = &proxy->notify.mr;
241 MemoryRegion *modern_notify_mr = &proxy->notify_pio.mr;
242 MemoryRegion *legacy_mr = &proxy->bar;
243 hwaddr modern_addr = virtio_pci_queue_mem_mult(proxy) *
244 virtio_get_queue_index(vq);
245 hwaddr legacy_addr = VIRTIO_PCI_QUEUE_NOTIFY;
246
247 if (assign) {
248 if (modern) {
249 if (fast_mmio) {
250 memory_region_add_eventfd(modern_mr, modern_addr, 0,
251 false, n, notifier);
252 } else {
253 memory_region_add_eventfd(modern_mr, modern_addr, 2,
254 false, n, notifier);
255 }
256 if (modern_pio) {
257 memory_region_add_eventfd(modern_notify_mr, 0, 2,
258 true, n, notifier);
259 }
260 }
261 if (legacy) {
262 memory_region_add_eventfd(legacy_mr, legacy_addr, 2,
263 true, n, notifier);
264 }
265 } else {
266 if (modern) {
267 if (fast_mmio) {
268 memory_region_del_eventfd(modern_mr, modern_addr, 0,
269 false, n, notifier);
270 } else {
271 memory_region_del_eventfd(modern_mr, modern_addr, 2,
272 false, n, notifier);
273 }
274 if (modern_pio) {
275 memory_region_del_eventfd(modern_notify_mr, 0, 2,
276 true, n, notifier);
277 }
278 }
279 if (legacy) {
280 memory_region_del_eventfd(legacy_mr, legacy_addr, 2,
281 true, n, notifier);
282 }
283 }
284 return 0;
285 }
286
287 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
288 {
289 virtio_bus_start_ioeventfd(&proxy->bus);
290 }
291
292 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
293 {
294 virtio_bus_stop_ioeventfd(&proxy->bus);
295 }
296
297 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
298 {
299 VirtIOPCIProxy *proxy = opaque;
300 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
301 hwaddr pa;
302
303 switch (addr) {
304 case VIRTIO_PCI_GUEST_FEATURES:
305 /* Guest does not negotiate properly? We have to assume nothing. */
306 if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
307 val = virtio_bus_get_vdev_bad_features(&proxy->bus);
308 }
309 virtio_set_features(vdev, val);
310 break;
311 case VIRTIO_PCI_QUEUE_PFN:
312 pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
313 if (pa == 0) {
314 virtio_pci_reset(DEVICE(proxy));
315 }
316 else
317 virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
318 break;
319 case VIRTIO_PCI_QUEUE_SEL:
320 if (val < VIRTIO_QUEUE_MAX)
321 vdev->queue_sel = val;
322 break;
323 case VIRTIO_PCI_QUEUE_NOTIFY:
324 if (val < VIRTIO_QUEUE_MAX) {
325 virtio_queue_notify(vdev, val);
326 }
327 break;
328 case VIRTIO_PCI_STATUS:
329 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
330 virtio_pci_stop_ioeventfd(proxy);
331 }
332
333 virtio_set_status(vdev, val & 0xFF);
334
335 if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
336 virtio_pci_start_ioeventfd(proxy);
337 }
338
339 if (vdev->status == 0) {
340 virtio_pci_reset(DEVICE(proxy));
341 }
342
343 /* Linux before 2.6.34 drives the device without enabling
344 the PCI device bus master bit. Enable it automatically
345 for the guest. This is a PCI spec violation but so is
346 initiating DMA with bus master bit clear. */
347 if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) {
348 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
349 proxy->pci_dev.config[PCI_COMMAND] |
350 PCI_COMMAND_MASTER, 1);
351 }
352 break;
353 case VIRTIO_MSI_CONFIG_VECTOR:
354 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
355 /* Make it possible for guest to discover an error took place. */
356 if (msix_vector_use(&proxy->pci_dev, val) < 0)
357 val = VIRTIO_NO_VECTOR;
358 vdev->config_vector = val;
359 break;
360 case VIRTIO_MSI_QUEUE_VECTOR:
361 msix_vector_unuse(&proxy->pci_dev,
362 virtio_queue_vector(vdev, vdev->queue_sel));
363 /* Make it possible for guest to discover an error took place. */
364 if (msix_vector_use(&proxy->pci_dev, val) < 0)
365 val = VIRTIO_NO_VECTOR;
366 virtio_queue_set_vector(vdev, vdev->queue_sel, val);
367 break;
368 default:
369 qemu_log_mask(LOG_GUEST_ERROR,
370 "%s: unexpected address 0x%x value 0x%x\n",
371 __func__, addr, val);
372 break;
373 }
374 }
375
376 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
377 {
378 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
379 uint32_t ret = 0xFFFFFFFF;
380
381 switch (addr) {
382 case VIRTIO_PCI_HOST_FEATURES:
383 ret = vdev->host_features;
384 break;
385 case VIRTIO_PCI_GUEST_FEATURES:
386 ret = vdev->guest_features;
387 break;
388 case VIRTIO_PCI_QUEUE_PFN:
389 ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
390 >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
391 break;
392 case VIRTIO_PCI_QUEUE_NUM:
393 ret = virtio_queue_get_num(vdev, vdev->queue_sel);
394 break;
395 case VIRTIO_PCI_QUEUE_SEL:
396 ret = vdev->queue_sel;
397 break;
398 case VIRTIO_PCI_STATUS:
399 ret = vdev->status;
400 break;
401 case VIRTIO_PCI_ISR:
402 /* reading from the ISR also clears it. */
403 ret = qatomic_xchg(&vdev->isr, 0);
404 pci_irq_deassert(&proxy->pci_dev);
405 break;
406 case VIRTIO_MSI_CONFIG_VECTOR:
407 ret = vdev->config_vector;
408 break;
409 case VIRTIO_MSI_QUEUE_VECTOR:
410 ret = virtio_queue_vector(vdev, vdev->queue_sel);
411 break;
412 default:
413 break;
414 }
415
416 return ret;
417 }
418
419 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
420 unsigned size)
421 {
422 VirtIOPCIProxy *proxy = opaque;
423 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
424 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev);
425 uint64_t val = 0;
426
427 if (vdev == NULL) {
428 return UINT64_MAX;
429 }
430
431 if (addr < config) {
432 return virtio_ioport_read(proxy, addr);
433 }
434 addr -= config;
435
436 switch (size) {
437 case 1:
438 val = virtio_config_readb(vdev, addr);
439 break;
440 case 2:
441 val = virtio_config_readw(vdev, addr);
442 if (virtio_is_big_endian(vdev)) {
443 val = bswap16(val);
444 }
445 break;
446 case 4:
447 val = virtio_config_readl(vdev, addr);
448 if (virtio_is_big_endian(vdev)) {
449 val = bswap32(val);
450 }
451 break;
452 }
453 return val;
454 }
455
456 static void virtio_pci_config_write(void *opaque, hwaddr addr,
457 uint64_t val, unsigned size)
458 {
459 VirtIOPCIProxy *proxy = opaque;
460 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev);
461 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
462
463 if (vdev == NULL) {
464 return;
465 }
466
467 if (addr < config) {
468 virtio_ioport_write(proxy, addr, val);
469 return;
470 }
471 addr -= config;
472 /*
473 * Virtio-PCI is odd. Ioports are LE but config space is target native
474 * endian.
475 */
476 switch (size) {
477 case 1:
478 virtio_config_writeb(vdev, addr, val);
479 break;
480 case 2:
481 if (virtio_is_big_endian(vdev)) {
482 val = bswap16(val);
483 }
484 virtio_config_writew(vdev, addr, val);
485 break;
486 case 4:
487 if (virtio_is_big_endian(vdev)) {
488 val = bswap32(val);
489 }
490 virtio_config_writel(vdev, addr, val);
491 break;
492 }
493 }
494
495 static const MemoryRegionOps virtio_pci_config_ops = {
496 .read = virtio_pci_config_read,
497 .write = virtio_pci_config_write,
498 .impl = {
499 .min_access_size = 1,
500 .max_access_size = 4,
501 },
502 .endianness = DEVICE_LITTLE_ENDIAN,
503 };
504
505 static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy,
506 hwaddr *off, int len)
507 {
508 int i;
509 VirtIOPCIRegion *reg;
510
511 for (i = 0; i < ARRAY_SIZE(proxy->regs); ++i) {
512 reg = &proxy->regs[i];
513 if (*off >= reg->offset &&
514 *off + len <= reg->offset + reg->size) {
515 *off -= reg->offset;
516 return &reg->mr;
517 }
518 }
519
520 return NULL;
521 }
522
523 /* Below are generic functions to do memcpy from/to an address space,
524 * without byteswaps, with input validation.
525 *
526 * As regular address_space_* APIs all do some kind of byteswap at least for
527 * some host/target combinations, we are forced to explicitly convert to a
528 * known-endianness integer value.
529 * It doesn't really matter which endian format to go through, so the code
530 * below selects the endian that causes the least amount of work on the given
531 * host.
532 *
533 * Note: host pointer must be aligned.
534 */
535 static
536 void virtio_address_space_write(VirtIOPCIProxy *proxy, hwaddr addr,
537 const uint8_t *buf, int len)
538 {
539 uint64_t val;
540 MemoryRegion *mr;
541
542 /* address_space_* APIs assume an aligned address.
543 * As address is under guest control, handle illegal values.
544 */
545 addr &= ~(len - 1);
546
547 mr = virtio_address_space_lookup(proxy, &addr, len);
548 if (!mr) {
549 return;
550 }
551
552 /* Make sure caller aligned buf properly */
553 assert(!(((uintptr_t)buf) & (len - 1)));
554
555 switch (len) {
556 case 1:
557 val = pci_get_byte(buf);
558 break;
559 case 2:
560 val = pci_get_word(buf);
561 break;
562 case 4:
563 val = pci_get_long(buf);
564 break;
565 default:
566 /* As length is under guest control, handle illegal values. */
567 return;
568 }
569 memory_region_dispatch_write(mr, addr, val, size_memop(len) | MO_LE,
570 MEMTXATTRS_UNSPECIFIED);
571 }
572
573 static void
574 virtio_address_space_read(VirtIOPCIProxy *proxy, hwaddr addr,
575 uint8_t *buf, int len)
576 {
577 uint64_t val;
578 MemoryRegion *mr;
579
580 /* address_space_* APIs assume an aligned address.
581 * As address is under guest control, handle illegal values.
582 */
583 addr &= ~(len - 1);
584
585 mr = virtio_address_space_lookup(proxy, &addr, len);
586 if (!mr) {
587 return;
588 }
589
590 /* Make sure caller aligned buf properly */
591 assert(!(((uintptr_t)buf) & (len - 1)));
592
593 memory_region_dispatch_read(mr, addr, &val, size_memop(len) | MO_LE,
594 MEMTXATTRS_UNSPECIFIED);
595 switch (len) {
596 case 1:
597 pci_set_byte(buf, val);
598 break;
599 case 2:
600 pci_set_word(buf, val);
601 break;
602 case 4:
603 pci_set_long(buf, val);
604 break;
605 default:
606 /* As length is under guest control, handle illegal values. */
607 break;
608 }
609 }
610
611 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
612 uint32_t val, int len)
613 {
614 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
615 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
616 struct virtio_pci_cfg_cap *cfg;
617
618 pci_default_write_config(pci_dev, address, val, len);
619
620 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) {
621 pcie_cap_flr_write_config(pci_dev, address, val, len);
622 }
623
624 if (range_covers_byte(address, len, PCI_COMMAND)) {
625 if (!(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
626 virtio_set_disabled(vdev, true);
627 virtio_pci_stop_ioeventfd(proxy);
628 virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
629 } else {
630 virtio_set_disabled(vdev, false);
631 }
632 }
633
634 if (proxy->config_cap &&
635 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap,
636 pci_cfg_data),
637 sizeof cfg->pci_cfg_data)) {
638 uint32_t off;
639 uint32_t len;
640
641 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap);
642 off = le32_to_cpu(cfg->cap.offset);
643 len = le32_to_cpu(cfg->cap.length);
644
645 if (len == 1 || len == 2 || len == 4) {
646 assert(len <= sizeof cfg->pci_cfg_data);
647 virtio_address_space_write(proxy, off, cfg->pci_cfg_data, len);
648 }
649 }
650 }
651
652 static uint32_t virtio_read_config(PCIDevice *pci_dev,
653 uint32_t address, int len)
654 {
655 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
656 struct virtio_pci_cfg_cap *cfg;
657
658 if (proxy->config_cap &&
659 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap,
660 pci_cfg_data),
661 sizeof cfg->pci_cfg_data)) {
662 uint32_t off;
663 uint32_t len;
664
665 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap);
666 off = le32_to_cpu(cfg->cap.offset);
667 len = le32_to_cpu(cfg->cap.length);
668
669 if (len == 1 || len == 2 || len == 4) {
670 assert(len <= sizeof cfg->pci_cfg_data);
671 virtio_address_space_read(proxy, off, cfg->pci_cfg_data, len);
672 }
673 }
674
675 return pci_default_read_config(pci_dev, address, len);
676 }
677
678 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
679 unsigned int queue_no,
680 unsigned int vector)
681 {
682 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
683 int ret;
684
685 if (irqfd->users == 0) {
686 KVMRouteChange c = kvm_irqchip_begin_route_changes(kvm_state);
687 ret = kvm_irqchip_add_msi_route(&c, vector, &proxy->pci_dev);
688 if (ret < 0) {
689 return ret;
690 }
691 kvm_irqchip_commit_route_changes(&c);
692 irqfd->virq = ret;
693 }
694 irqfd->users++;
695 return 0;
696 }
697
698 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
699 unsigned int vector)
700 {
701 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
702 if (--irqfd->users == 0) {
703 kvm_irqchip_release_virq(kvm_state, irqfd->virq);
704 }
705 }
706
707 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
708 unsigned int queue_no,
709 unsigned int vector)
710 {
711 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
712 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
713 VirtQueue *vq = virtio_get_queue(vdev, queue_no);
714 EventNotifier *n = virtio_queue_get_guest_notifier(vq);
715 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq);
716 }
717
718 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
719 unsigned int queue_no,
720 unsigned int vector)
721 {
722 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
723 VirtQueue *vq = virtio_get_queue(vdev, queue_no);
724 EventNotifier *n = virtio_queue_get_guest_notifier(vq);
725 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
726 int ret;
727
728 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->virq);
729 assert(ret == 0);
730 }
731
732 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
733 {
734 PCIDevice *dev = &proxy->pci_dev;
735 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
736 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
737 unsigned int vector;
738 int ret, queue_no;
739
740 for (queue_no = 0; queue_no < nvqs; queue_no++) {
741 if (!virtio_queue_get_num(vdev, queue_no)) {
742 break;
743 }
744 vector = virtio_queue_vector(vdev, queue_no);
745 if (vector >= msix_nr_vectors_allocated(dev)) {
746 continue;
747 }
748 ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector);
749 if (ret < 0) {
750 goto undo;
751 }
752 /* If guest supports masking, set up irqfd now.
753 * Otherwise, delay until unmasked in the frontend.
754 */
755 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
756 ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
757 if (ret < 0) {
758 kvm_virtio_pci_vq_vector_release(proxy, vector);
759 goto undo;
760 }
761 }
762 }
763 return 0;
764
765 undo:
766 while (--queue_no >= 0) {
767 vector = virtio_queue_vector(vdev, queue_no);
768 if (vector >= msix_nr_vectors_allocated(dev)) {
769 continue;
770 }
771 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
772 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
773 }
774 kvm_virtio_pci_vq_vector_release(proxy, vector);
775 }
776 return ret;
777 }
778
779 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
780 {
781 PCIDevice *dev = &proxy->pci_dev;
782 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
783 unsigned int vector;
784 int queue_no;
785 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
786
787 for (queue_no = 0; queue_no < nvqs; queue_no++) {
788 if (!virtio_queue_get_num(vdev, queue_no)) {
789 break;
790 }
791 vector = virtio_queue_vector(vdev, queue_no);
792 if (vector >= msix_nr_vectors_allocated(dev)) {
793 continue;
794 }
795 /* If guest supports masking, clean up irqfd now.
796 * Otherwise, it was cleaned when masked in the frontend.
797 */
798 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
799 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
800 }
801 kvm_virtio_pci_vq_vector_release(proxy, vector);
802 }
803 }
804
805 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
806 unsigned int queue_no,
807 unsigned int vector,
808 MSIMessage msg)
809 {
810 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
811 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
812 VirtQueue *vq = virtio_get_queue(vdev, queue_no);
813 EventNotifier *n = virtio_queue_get_guest_notifier(vq);
814 VirtIOIRQFD *irqfd;
815 int ret = 0;
816
817 if (proxy->vector_irqfd) {
818 irqfd = &proxy->vector_irqfd[vector];
819 if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) {
820 ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg,
821 &proxy->pci_dev);
822 if (ret < 0) {
823 return ret;
824 }
825 kvm_irqchip_commit_routes(kvm_state);
826 }
827 }
828
829 /* If guest supports masking, irqfd is already setup, unmask it.
830 * Otherwise, set it up now.
831 */
832 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
833 k->guest_notifier_mask(vdev, queue_no, false);
834 /* Test after unmasking to avoid losing events. */
835 if (k->guest_notifier_pending &&
836 k->guest_notifier_pending(vdev, queue_no)) {
837 event_notifier_set(n);
838 }
839 } else {
840 ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
841 }
842 return ret;
843 }
844
845 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
846 unsigned int queue_no,
847 unsigned int vector)
848 {
849 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
850 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
851
852 /* If guest supports masking, keep irqfd but mask it.
853 * Otherwise, clean it up now.
854 */
855 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
856 k->guest_notifier_mask(vdev, queue_no, true);
857 } else {
858 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
859 }
860 }
861
862 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
863 MSIMessage msg)
864 {
865 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
866 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
867 VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
868 int ret, index, unmasked = 0;
869
870 while (vq) {
871 index = virtio_get_queue_index(vq);
872 if (!virtio_queue_get_num(vdev, index)) {
873 break;
874 }
875 if (index < proxy->nvqs_with_notifiers) {
876 ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg);
877 if (ret < 0) {
878 goto undo;
879 }
880 ++unmasked;
881 }
882 vq = virtio_vector_next_queue(vq);
883 }
884
885 return 0;
886
887 undo:
888 vq = virtio_vector_first_queue(vdev, vector);
889 while (vq && unmasked >= 0) {
890 index = virtio_get_queue_index(vq);
891 if (index < proxy->nvqs_with_notifiers) {
892 virtio_pci_vq_vector_mask(proxy, index, vector);
893 --unmasked;
894 }
895 vq = virtio_vector_next_queue(vq);
896 }
897 return ret;
898 }
899
900 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
901 {
902 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
903 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
904 VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
905 int index;
906
907 while (vq) {
908 index = virtio_get_queue_index(vq);
909 if (!virtio_queue_get_num(vdev, index)) {
910 break;
911 }
912 if (index < proxy->nvqs_with_notifiers) {
913 virtio_pci_vq_vector_mask(proxy, index, vector);
914 }
915 vq = virtio_vector_next_queue(vq);
916 }
917 }
918
919 static void virtio_pci_vector_poll(PCIDevice *dev,
920 unsigned int vector_start,
921 unsigned int vector_end)
922 {
923 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
924 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
925 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
926 int queue_no;
927 unsigned int vector;
928 EventNotifier *notifier;
929 VirtQueue *vq;
930
931 for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
932 if (!virtio_queue_get_num(vdev, queue_no)) {
933 break;
934 }
935 vector = virtio_queue_vector(vdev, queue_no);
936 if (vector < vector_start || vector >= vector_end ||
937 !msix_is_masked(dev, vector)) {
938 continue;
939 }
940 vq = virtio_get_queue(vdev, queue_no);
941 notifier = virtio_queue_get_guest_notifier(vq);
942 if (k->guest_notifier_pending) {
943 if (k->guest_notifier_pending(vdev, queue_no)) {
944 msix_set_pending(dev, vector);
945 }
946 } else if (event_notifier_test_and_clear(notifier)) {
947 msix_set_pending(dev, vector);
948 }
949 }
950 }
951
952 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
953 bool with_irqfd)
954 {
955 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
956 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
957 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
958 VirtQueue *vq = virtio_get_queue(vdev, n);
959 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
960
961 if (assign) {
962 int r = event_notifier_init(notifier, 0);
963 if (r < 0) {
964 return r;
965 }
966 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
967 } else {
968 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
969 event_notifier_cleanup(notifier);
970 }
971
972 if (!msix_enabled(&proxy->pci_dev) &&
973 vdev->use_guest_notifier_mask &&
974 vdc->guest_notifier_mask) {
975 vdc->guest_notifier_mask(vdev, n, !assign);
976 }
977
978 return 0;
979 }
980
981 static bool virtio_pci_query_guest_notifiers(DeviceState *d)
982 {
983 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
984 return msix_enabled(&proxy->pci_dev);
985 }
986
987 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
988 {
989 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
990 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
991 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
992 int r, n;
993 bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
994 kvm_msi_via_irqfd_enabled();
995
996 nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX);
997
998 /* When deassigning, pass a consistent nvqs value
999 * to avoid leaking notifiers.
1000 */
1001 assert(assign || nvqs == proxy->nvqs_with_notifiers);
1002
1003 proxy->nvqs_with_notifiers = nvqs;
1004
1005 /* Must unset vector notifier while guest notifier is still assigned */
1006 if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) {
1007 msix_unset_vector_notifiers(&proxy->pci_dev);
1008 if (proxy->vector_irqfd) {
1009 kvm_virtio_pci_vector_release(proxy, nvqs);
1010 g_free(proxy->vector_irqfd);
1011 proxy->vector_irqfd = NULL;
1012 }
1013 }
1014
1015 for (n = 0; n < nvqs; n++) {
1016 if (!virtio_queue_get_num(vdev, n)) {
1017 break;
1018 }
1019
1020 r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd);
1021 if (r < 0) {
1022 goto assign_error;
1023 }
1024 }
1025
1026 /* Must set vector notifier after guest notifier has been assigned */
1027 if ((with_irqfd || k->guest_notifier_mask) && assign) {
1028 if (with_irqfd) {
1029 proxy->vector_irqfd =
1030 g_malloc0(sizeof(*proxy->vector_irqfd) *
1031 msix_nr_vectors_allocated(&proxy->pci_dev));
1032 r = kvm_virtio_pci_vector_use(proxy, nvqs);
1033 if (r < 0) {
1034 goto assign_error;
1035 }
1036 }
1037 r = msix_set_vector_notifiers(&proxy->pci_dev,
1038 virtio_pci_vector_unmask,
1039 virtio_pci_vector_mask,
1040 virtio_pci_vector_poll);
1041 if (r < 0) {
1042 goto notifiers_error;
1043 }
1044 }
1045
1046 return 0;
1047
1048 notifiers_error:
1049 if (with_irqfd) {
1050 assert(assign);
1051 kvm_virtio_pci_vector_release(proxy, nvqs);
1052 }
1053
1054 assign_error:
1055 /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
1056 assert(assign);
1057 while (--n >= 0) {
1058 virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd);
1059 }
1060 return r;
1061 }
1062
1063 static int virtio_pci_set_host_notifier_mr(DeviceState *d, int n,
1064 MemoryRegion *mr, bool assign)
1065 {
1066 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
1067 int offset;
1068
1069 if (n >= VIRTIO_QUEUE_MAX || !virtio_pci_modern(proxy) ||
1070 virtio_pci_queue_mem_mult(proxy) != memory_region_size(mr)) {
1071 return -1;
1072 }
1073
1074 if (assign) {
1075 offset = virtio_pci_queue_mem_mult(proxy) * n;
1076 memory_region_add_subregion_overlap(&proxy->notify.mr, offset, mr, 1);
1077 } else {
1078 memory_region_del_subregion(&proxy->notify.mr, mr);
1079 }
1080
1081 return 0;
1082 }
1083
1084 static void virtio_pci_vmstate_change(DeviceState *d, bool running)
1085 {
1086 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
1087 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1088
1089 if (running) {
1090 /* Old QEMU versions did not set bus master enable on status write.
1091 * Detect DRIVER set and enable it.
1092 */
1093 if ((proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION) &&
1094 (vdev->status & VIRTIO_CONFIG_S_DRIVER) &&
1095 !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
1096 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
1097 proxy->pci_dev.config[PCI_COMMAND] |
1098 PCI_COMMAND_MASTER, 1);
1099 }
1100 virtio_pci_start_ioeventfd(proxy);
1101 } else {
1102 virtio_pci_stop_ioeventfd(proxy);
1103 }
1104 }
1105
1106 /*
1107 * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
1108 */
1109
1110 static int virtio_pci_query_nvectors(DeviceState *d)
1111 {
1112 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1113
1114 return proxy->nvectors;
1115 }
1116
1117 static AddressSpace *virtio_pci_get_dma_as(DeviceState *d)
1118 {
1119 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1120 PCIDevice *dev = &proxy->pci_dev;
1121
1122 return pci_get_address_space(dev);
1123 }
1124
1125 static bool virtio_pci_iommu_enabled(DeviceState *d)
1126 {
1127 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1128 PCIDevice *dev = &proxy->pci_dev;
1129 AddressSpace *dma_as = pci_device_iommu_address_space(dev);
1130
1131 if (dma_as == &address_space_memory) {
1132 return false;
1133 }
1134
1135 return true;
1136 }
1137
1138 static bool virtio_pci_queue_enabled(DeviceState *d, int n)
1139 {
1140 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1141 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1142
1143 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1144 return proxy->vqs[n].enabled;
1145 }
1146
1147 return virtio_queue_enabled_legacy(vdev, n);
1148 }
1149
1150 static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy,
1151 struct virtio_pci_cap *cap)
1152 {
1153 PCIDevice *dev = &proxy->pci_dev;
1154 int offset;
1155
1156 offset = pci_add_capability(dev, PCI_CAP_ID_VNDR, 0,
1157 cap->cap_len, &error_abort);
1158
1159 assert(cap->cap_len >= sizeof *cap);
1160 memcpy(dev->config + offset + PCI_CAP_FLAGS, &cap->cap_len,
1161 cap->cap_len - PCI_CAP_FLAGS);
1162
1163 return offset;
1164 }
1165
1166 static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr,
1167 unsigned size)
1168 {
1169 VirtIOPCIProxy *proxy = opaque;
1170 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1171 uint32_t val = 0;
1172 int i;
1173
1174 if (vdev == NULL) {
1175 return UINT64_MAX;
1176 }
1177
1178 switch (addr) {
1179 case VIRTIO_PCI_COMMON_DFSELECT:
1180 val = proxy->dfselect;
1181 break;
1182 case VIRTIO_PCI_COMMON_DF:
1183 if (proxy->dfselect <= 1) {
1184 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
1185
1186 val = (vdev->host_features & ~vdc->legacy_features) >>
1187 (32 * proxy->dfselect);
1188 }
1189 break;
1190 case VIRTIO_PCI_COMMON_GFSELECT:
1191 val = proxy->gfselect;
1192 break;
1193 case VIRTIO_PCI_COMMON_GF:
1194 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) {
1195 val = proxy->guest_features[proxy->gfselect];
1196 }
1197 break;
1198 case VIRTIO_PCI_COMMON_MSIX:
1199 val = vdev->config_vector;
1200 break;
1201 case VIRTIO_PCI_COMMON_NUMQ:
1202 for (i = 0; i < VIRTIO_QUEUE_MAX; ++i) {
1203 if (virtio_queue_get_num(vdev, i)) {
1204 val = i + 1;
1205 }
1206 }
1207 break;
1208 case VIRTIO_PCI_COMMON_STATUS:
1209 val = vdev->status;
1210 break;
1211 case VIRTIO_PCI_COMMON_CFGGENERATION:
1212 val = vdev->generation;
1213 break;
1214 case VIRTIO_PCI_COMMON_Q_SELECT:
1215 val = vdev->queue_sel;
1216 break;
1217 case VIRTIO_PCI_COMMON_Q_SIZE:
1218 val = virtio_queue_get_num(vdev, vdev->queue_sel);
1219 break;
1220 case VIRTIO_PCI_COMMON_Q_MSIX:
1221 val = virtio_queue_vector(vdev, vdev->queue_sel);
1222 break;
1223 case VIRTIO_PCI_COMMON_Q_ENABLE:
1224 val = proxy->vqs[vdev->queue_sel].enabled;
1225 break;
1226 case VIRTIO_PCI_COMMON_Q_NOFF:
1227 /* Simply map queues in order */
1228 val = vdev->queue_sel;
1229 break;
1230 case VIRTIO_PCI_COMMON_Q_DESCLO:
1231 val = proxy->vqs[vdev->queue_sel].desc[0];
1232 break;
1233 case VIRTIO_PCI_COMMON_Q_DESCHI:
1234 val = proxy->vqs[vdev->queue_sel].desc[1];
1235 break;
1236 case VIRTIO_PCI_COMMON_Q_AVAILLO:
1237 val = proxy->vqs[vdev->queue_sel].avail[0];
1238 break;
1239 case VIRTIO_PCI_COMMON_Q_AVAILHI:
1240 val = proxy->vqs[vdev->queue_sel].avail[1];
1241 break;
1242 case VIRTIO_PCI_COMMON_Q_USEDLO:
1243 val = proxy->vqs[vdev->queue_sel].used[0];
1244 break;
1245 case VIRTIO_PCI_COMMON_Q_USEDHI:
1246 val = proxy->vqs[vdev->queue_sel].used[1];
1247 break;
1248 default:
1249 val = 0;
1250 }
1251
1252 return val;
1253 }
1254
1255 static void virtio_pci_common_write(void *opaque, hwaddr addr,
1256 uint64_t val, unsigned size)
1257 {
1258 VirtIOPCIProxy *proxy = opaque;
1259 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1260
1261 if (vdev == NULL) {
1262 return;
1263 }
1264
1265 switch (addr) {
1266 case VIRTIO_PCI_COMMON_DFSELECT:
1267 proxy->dfselect = val;
1268 break;
1269 case VIRTIO_PCI_COMMON_GFSELECT:
1270 proxy->gfselect = val;
1271 break;
1272 case VIRTIO_PCI_COMMON_GF:
1273 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) {
1274 proxy->guest_features[proxy->gfselect] = val;
1275 virtio_set_features(vdev,
1276 (((uint64_t)proxy->guest_features[1]) << 32) |
1277 proxy->guest_features[0]);
1278 }
1279 break;
1280 case VIRTIO_PCI_COMMON_MSIX:
1281 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
1282 /* Make it possible for guest to discover an error took place. */
1283 if (msix_vector_use(&proxy->pci_dev, val) < 0) {
1284 val = VIRTIO_NO_VECTOR;
1285 }
1286 vdev->config_vector = val;
1287 break;
1288 case VIRTIO_PCI_COMMON_STATUS:
1289 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
1290 virtio_pci_stop_ioeventfd(proxy);
1291 }
1292
1293 virtio_set_status(vdev, val & 0xFF);
1294
1295 if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
1296 virtio_pci_start_ioeventfd(proxy);
1297 }
1298
1299 if (vdev->status == 0) {
1300 virtio_pci_reset(DEVICE(proxy));
1301 }
1302
1303 break;
1304 case VIRTIO_PCI_COMMON_Q_SELECT:
1305 if (val < VIRTIO_QUEUE_MAX) {
1306 vdev->queue_sel = val;
1307 }
1308 break;
1309 case VIRTIO_PCI_COMMON_Q_SIZE:
1310 proxy->vqs[vdev->queue_sel].num = val;
1311 virtio_queue_set_num(vdev, vdev->queue_sel,
1312 proxy->vqs[vdev->queue_sel].num);
1313 break;
1314 case VIRTIO_PCI_COMMON_Q_MSIX:
1315 msix_vector_unuse(&proxy->pci_dev,
1316 virtio_queue_vector(vdev, vdev->queue_sel));
1317 /* Make it possible for guest to discover an error took place. */
1318 if (msix_vector_use(&proxy->pci_dev, val) < 0) {
1319 val = VIRTIO_NO_VECTOR;
1320 }
1321 virtio_queue_set_vector(vdev, vdev->queue_sel, val);
1322 break;
1323 case VIRTIO_PCI_COMMON_Q_ENABLE:
1324 if (val == 1) {
1325 virtio_queue_set_num(vdev, vdev->queue_sel,
1326 proxy->vqs[vdev->queue_sel].num);
1327 virtio_queue_set_rings(vdev, vdev->queue_sel,
1328 ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 |
1329 proxy->vqs[vdev->queue_sel].desc[0],
1330 ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 |
1331 proxy->vqs[vdev->queue_sel].avail[0],
1332 ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 |
1333 proxy->vqs[vdev->queue_sel].used[0]);
1334 proxy->vqs[vdev->queue_sel].enabled = 1;
1335 } else {
1336 virtio_error(vdev, "wrong value for queue_enable %"PRIx64, val);
1337 }
1338 break;
1339 case VIRTIO_PCI_COMMON_Q_DESCLO:
1340 proxy->vqs[vdev->queue_sel].desc[0] = val;
1341 break;
1342 case VIRTIO_PCI_COMMON_Q_DESCHI:
1343 proxy->vqs[vdev->queue_sel].desc[1] = val;
1344 break;
1345 case VIRTIO_PCI_COMMON_Q_AVAILLO:
1346 proxy->vqs[vdev->queue_sel].avail[0] = val;
1347 break;
1348 case VIRTIO_PCI_COMMON_Q_AVAILHI:
1349 proxy->vqs[vdev->queue_sel].avail[1] = val;
1350 break;
1351 case VIRTIO_PCI_COMMON_Q_USEDLO:
1352 proxy->vqs[vdev->queue_sel].used[0] = val;
1353 break;
1354 case VIRTIO_PCI_COMMON_Q_USEDHI:
1355 proxy->vqs[vdev->queue_sel].used[1] = val;
1356 break;
1357 default:
1358 break;
1359 }
1360 }
1361
1362
1363 static uint64_t virtio_pci_notify_read(void *opaque, hwaddr addr,
1364 unsigned size)
1365 {
1366 VirtIOPCIProxy *proxy = opaque;
1367 if (virtio_bus_get_device(&proxy->bus) == NULL) {
1368 return UINT64_MAX;
1369 }
1370
1371 return 0;
1372 }
1373
1374 static void virtio_pci_notify_write(void *opaque, hwaddr addr,
1375 uint64_t val, unsigned size)
1376 {
1377 VirtIOPCIProxy *proxy = opaque;
1378 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1379
1380 unsigned queue = addr / virtio_pci_queue_mem_mult(proxy);
1381
1382 if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) {
1383 virtio_queue_notify(vdev, queue);
1384 }
1385 }
1386
1387 static void virtio_pci_notify_write_pio(void *opaque, hwaddr addr,
1388 uint64_t val, unsigned size)
1389 {
1390 VirtIOPCIProxy *proxy = opaque;
1391 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1392
1393 unsigned queue = val;
1394
1395 if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) {
1396 virtio_queue_notify(vdev, queue);
1397 }
1398 }
1399
1400 static uint64_t virtio_pci_isr_read(void *opaque, hwaddr addr,
1401 unsigned size)
1402 {
1403 VirtIOPCIProxy *proxy = opaque;
1404 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1405 uint64_t val;
1406
1407 if (vdev == NULL) {
1408 return UINT64_MAX;
1409 }
1410
1411 val = qatomic_xchg(&vdev->isr, 0);
1412 pci_irq_deassert(&proxy->pci_dev);
1413 return val;
1414 }
1415
1416 static void virtio_pci_isr_write(void *opaque, hwaddr addr,
1417 uint64_t val, unsigned size)
1418 {
1419 }
1420
1421 static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr,
1422 unsigned size)
1423 {
1424 VirtIOPCIProxy *proxy = opaque;
1425 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1426 uint64_t val;
1427
1428 if (vdev == NULL) {
1429 return UINT64_MAX;
1430 }
1431
1432 switch (size) {
1433 case 1:
1434 val = virtio_config_modern_readb(vdev, addr);
1435 break;
1436 case 2:
1437 val = virtio_config_modern_readw(vdev, addr);
1438 break;
1439 case 4:
1440 val = virtio_config_modern_readl(vdev, addr);
1441 break;
1442 default:
1443 val = 0;
1444 break;
1445 }
1446 return val;
1447 }
1448
1449 static void virtio_pci_device_write(void *opaque, hwaddr addr,
1450 uint64_t val, unsigned size)
1451 {
1452 VirtIOPCIProxy *proxy = opaque;
1453 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1454
1455 if (vdev == NULL) {
1456 return;
1457 }
1458
1459 switch (size) {
1460 case 1:
1461 virtio_config_modern_writeb(vdev, addr, val);
1462 break;
1463 case 2:
1464 virtio_config_modern_writew(vdev, addr, val);
1465 break;
1466 case 4:
1467 virtio_config_modern_writel(vdev, addr, val);
1468 break;
1469 }
1470 }
1471
1472 static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy,
1473 const char *vdev_name)
1474 {
1475 static const MemoryRegionOps common_ops = {
1476 .read = virtio_pci_common_read,
1477 .write = virtio_pci_common_write,
1478 .impl = {
1479 .min_access_size = 1,
1480 .max_access_size = 4,
1481 },
1482 .endianness = DEVICE_LITTLE_ENDIAN,
1483 };
1484 static const MemoryRegionOps isr_ops = {
1485 .read = virtio_pci_isr_read,
1486 .write = virtio_pci_isr_write,
1487 .impl = {
1488 .min_access_size = 1,
1489 .max_access_size = 4,
1490 },
1491 .endianness = DEVICE_LITTLE_ENDIAN,
1492 };
1493 static const MemoryRegionOps device_ops = {
1494 .read = virtio_pci_device_read,
1495 .write = virtio_pci_device_write,
1496 .impl = {
1497 .min_access_size = 1,
1498 .max_access_size = 4,
1499 },
1500 .endianness = DEVICE_LITTLE_ENDIAN,
1501 };
1502 static const MemoryRegionOps notify_ops = {
1503 .read = virtio_pci_notify_read,
1504 .write = virtio_pci_notify_write,
1505 .impl = {
1506 .min_access_size = 1,
1507 .max_access_size = 4,
1508 },
1509 .endianness = DEVICE_LITTLE_ENDIAN,
1510 };
1511 static const MemoryRegionOps notify_pio_ops = {
1512 .read = virtio_pci_notify_read,
1513 .write = virtio_pci_notify_write_pio,
1514 .impl = {
1515 .min_access_size = 1,
1516 .max_access_size = 4,
1517 },
1518 .endianness = DEVICE_LITTLE_ENDIAN,
1519 };
1520 g_autoptr(GString) name = g_string_new(NULL);
1521
1522 g_string_printf(name, "virtio-pci-common-%s", vdev_name);
1523 memory_region_init_io(&proxy->common.mr, OBJECT(proxy),
1524 &common_ops,
1525 proxy,
1526 name->str,
1527 proxy->common.size);
1528
1529 g_string_printf(name, "virtio-pci-isr-%s", vdev_name);
1530 memory_region_init_io(&proxy->isr.mr, OBJECT(proxy),
1531 &isr_ops,
1532 proxy,
1533 name->str,
1534 proxy->isr.size);
1535
1536 g_string_printf(name, "virtio-pci-device-%s", vdev_name);
1537 memory_region_init_io(&proxy->device.mr, OBJECT(proxy),
1538 &device_ops,
1539 proxy,
1540 name->str,
1541 proxy->device.size);
1542
1543 g_string_printf(name, "virtio-pci-notify-%s", vdev_name);
1544 memory_region_init_io(&proxy->notify.mr, OBJECT(proxy),
1545 &notify_ops,
1546 proxy,
1547 name->str,
1548 proxy->notify.size);
1549
1550 g_string_printf(name, "virtio-pci-notify-pio-%s", vdev_name);
1551 memory_region_init_io(&proxy->notify_pio.mr, OBJECT(proxy),
1552 &notify_pio_ops,
1553 proxy,
1554 name->str,
1555 proxy->notify_pio.size);
1556 }
1557
1558 static void virtio_pci_modern_region_map(VirtIOPCIProxy *proxy,
1559 VirtIOPCIRegion *region,
1560 struct virtio_pci_cap *cap,
1561 MemoryRegion *mr,
1562 uint8_t bar)
1563 {
1564 memory_region_add_subregion(mr, region->offset, &region->mr);
1565
1566 cap->cfg_type = region->type;
1567 cap->bar = bar;
1568 cap->offset = cpu_to_le32(region->offset);
1569 cap->length = cpu_to_le32(region->size);
1570 virtio_pci_add_mem_cap(proxy, cap);
1571
1572 }
1573
1574 static void virtio_pci_modern_mem_region_map(VirtIOPCIProxy *proxy,
1575 VirtIOPCIRegion *region,
1576 struct virtio_pci_cap *cap)
1577 {
1578 virtio_pci_modern_region_map(proxy, region, cap,
1579 &proxy->modern_bar, proxy->modern_mem_bar_idx);
1580 }
1581
1582 static void virtio_pci_modern_io_region_map(VirtIOPCIProxy *proxy,
1583 VirtIOPCIRegion *region,
1584 struct virtio_pci_cap *cap)
1585 {
1586 virtio_pci_modern_region_map(proxy, region, cap,
1587 &proxy->io_bar, proxy->modern_io_bar_idx);
1588 }
1589
1590 static void virtio_pci_modern_mem_region_unmap(VirtIOPCIProxy *proxy,
1591 VirtIOPCIRegion *region)
1592 {
1593 memory_region_del_subregion(&proxy->modern_bar,
1594 &region->mr);
1595 }
1596
1597 static void virtio_pci_modern_io_region_unmap(VirtIOPCIProxy *proxy,
1598 VirtIOPCIRegion *region)
1599 {
1600 memory_region_del_subregion(&proxy->io_bar,
1601 &region->mr);
1602 }
1603
1604 static void virtio_pci_pre_plugged(DeviceState *d, Error **errp)
1605 {
1606 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1607 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1608
1609 if (virtio_pci_modern(proxy)) {
1610 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1);
1611 }
1612
1613 virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE);
1614 }
1615
1616 /* This is called by virtio-bus just after the device is plugged. */
1617 static void virtio_pci_device_plugged(DeviceState *d, Error **errp)
1618 {
1619 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1620 VirtioBusState *bus = &proxy->bus;
1621 bool legacy = virtio_pci_legacy(proxy);
1622 bool modern;
1623 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
1624 uint8_t *config;
1625 uint32_t size;
1626 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1627
1628 /*
1629 * Virtio capabilities present without
1630 * VIRTIO_F_VERSION_1 confuses guests
1631 */
1632 if (!proxy->ignore_backend_features &&
1633 !virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) {
1634 virtio_pci_disable_modern(proxy);
1635
1636 if (!legacy) {
1637 error_setg(errp, "Device doesn't support modern mode, and legacy"
1638 " mode is disabled");
1639 error_append_hint(errp, "Set disable-legacy to off\n");
1640
1641 return;
1642 }
1643 }
1644
1645 modern = virtio_pci_modern(proxy);
1646
1647 config = proxy->pci_dev.config;
1648 if (proxy->class_code) {
1649 pci_config_set_class(config, proxy->class_code);
1650 }
1651
1652 if (legacy) {
1653 if (!virtio_legacy_allowed(vdev)) {
1654 /*
1655 * To avoid migration issues, we allow legacy mode when legacy
1656 * check is disabled in the old machine types (< 5.1).
1657 */
1658 if (virtio_legacy_check_disabled(vdev)) {
1659 warn_report("device is modern-only, but for backward "
1660 "compatibility legacy is allowed");
1661 } else {
1662 error_setg(errp,
1663 "device is modern-only, use disable-legacy=on");
1664 return;
1665 }
1666 }
1667 if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
1668 error_setg(errp, "VIRTIO_F_IOMMU_PLATFORM was supported by"
1669 " neither legacy nor transitional device");
1670 return ;
1671 }
1672 /*
1673 * Legacy and transitional devices use specific subsystem IDs.
1674 * Note that the subsystem vendor ID (config + PCI_SUBSYSTEM_VENDOR_ID)
1675 * is set to PCI_SUBVENDOR_ID_REDHAT_QUMRANET by default.
1676 */
1677 pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus));
1678 } else {
1679 /* pure virtio-1.0 */
1680 pci_set_word(config + PCI_VENDOR_ID,
1681 PCI_VENDOR_ID_REDHAT_QUMRANET);
1682 pci_set_word(config + PCI_DEVICE_ID,
1683 0x1040 + virtio_bus_get_vdev_id(bus));
1684 pci_config_set_revision(config, 1);
1685 }
1686 config[PCI_INTERRUPT_PIN] = 1;
1687
1688
1689 if (modern) {
1690 struct virtio_pci_cap cap = {
1691 .cap_len = sizeof cap,
1692 };
1693 struct virtio_pci_notify_cap notify = {
1694 .cap.cap_len = sizeof notify,
1695 .notify_off_multiplier =
1696 cpu_to_le32(virtio_pci_queue_mem_mult(proxy)),
1697 };
1698 struct virtio_pci_cfg_cap cfg = {
1699 .cap.cap_len = sizeof cfg,
1700 .cap.cfg_type = VIRTIO_PCI_CAP_PCI_CFG,
1701 };
1702 struct virtio_pci_notify_cap notify_pio = {
1703 .cap.cap_len = sizeof notify,
1704 .notify_off_multiplier = cpu_to_le32(0x0),
1705 };
1706
1707 struct virtio_pci_cfg_cap *cfg_mask;
1708
1709 virtio_pci_modern_regions_init(proxy, vdev->name);
1710
1711 virtio_pci_modern_mem_region_map(proxy, &proxy->common, &cap);
1712 virtio_pci_modern_mem_region_map(proxy, &proxy->isr, &cap);
1713 virtio_pci_modern_mem_region_map(proxy, &proxy->device, &cap);
1714 virtio_pci_modern_mem_region_map(proxy, &proxy->notify, &notify.cap);
1715
1716 if (modern_pio) {
1717 memory_region_init(&proxy->io_bar, OBJECT(proxy),
1718 "virtio-pci-io", 0x4);
1719
1720 pci_register_bar(&proxy->pci_dev, proxy->modern_io_bar_idx,
1721 PCI_BASE_ADDRESS_SPACE_IO, &proxy->io_bar);
1722
1723 virtio_pci_modern_io_region_map(proxy, &proxy->notify_pio,
1724 &notify_pio.cap);
1725 }
1726
1727 pci_register_bar(&proxy->pci_dev, proxy->modern_mem_bar_idx,
1728 PCI_BASE_ADDRESS_SPACE_MEMORY |
1729 PCI_BASE_ADDRESS_MEM_PREFETCH |
1730 PCI_BASE_ADDRESS_MEM_TYPE_64,
1731 &proxy->modern_bar);
1732
1733 proxy->config_cap = virtio_pci_add_mem_cap(proxy, &cfg.cap);
1734 cfg_mask = (void *)(proxy->pci_dev.wmask + proxy->config_cap);
1735 pci_set_byte(&cfg_mask->cap.bar, ~0x0);
1736 pci_set_long((uint8_t *)&cfg_mask->cap.offset, ~0x0);
1737 pci_set_long((uint8_t *)&cfg_mask->cap.length, ~0x0);
1738 pci_set_long(cfg_mask->pci_cfg_data, ~0x0);
1739 }
1740
1741 if (proxy->nvectors) {
1742 int err = msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors,
1743 proxy->msix_bar_idx, NULL);
1744 if (err) {
1745 /* Notice when a system that supports MSIx can't initialize it */
1746 if (err != -ENOTSUP) {
1747 warn_report("unable to init msix vectors to %" PRIu32,
1748 proxy->nvectors);
1749 }
1750 proxy->nvectors = 0;
1751 }
1752 }
1753
1754 proxy->pci_dev.config_write = virtio_write_config;
1755 proxy->pci_dev.config_read = virtio_read_config;
1756
1757 if (legacy) {
1758 size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
1759 + virtio_bus_get_vdev_config_len(bus);
1760 size = pow2ceil(size);
1761
1762 memory_region_init_io(&proxy->bar, OBJECT(proxy),
1763 &virtio_pci_config_ops,
1764 proxy, "virtio-pci", size);
1765
1766 pci_register_bar(&proxy->pci_dev, proxy->legacy_io_bar_idx,
1767 PCI_BASE_ADDRESS_SPACE_IO, &proxy->bar);
1768 }
1769 }
1770
1771 static void virtio_pci_device_unplugged(DeviceState *d)
1772 {
1773 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1774 bool modern = virtio_pci_modern(proxy);
1775 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
1776
1777 virtio_pci_stop_ioeventfd(proxy);
1778
1779 if (modern) {
1780 virtio_pci_modern_mem_region_unmap(proxy, &proxy->common);
1781 virtio_pci_modern_mem_region_unmap(proxy, &proxy->isr);
1782 virtio_pci_modern_mem_region_unmap(proxy, &proxy->device);
1783 virtio_pci_modern_mem_region_unmap(proxy, &proxy->notify);
1784 if (modern_pio) {
1785 virtio_pci_modern_io_region_unmap(proxy, &proxy->notify_pio);
1786 }
1787 }
1788 }
1789
1790 static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
1791 {
1792 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
1793 VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
1794 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) &&
1795 !pci_bus_is_root(pci_get_bus(pci_dev));
1796
1797 if (kvm_enabled() && !kvm_has_many_ioeventfds()) {
1798 proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
1799 }
1800
1801 /* fd-based ioevents can't be synchronized in record/replay */
1802 if (replay_mode != REPLAY_MODE_NONE) {
1803 proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
1804 }
1805
1806 /*
1807 * virtio pci bar layout used by default.
1808 * subclasses can re-arrange things if needed.
1809 *
1810 * region 0 -- virtio legacy io bar
1811 * region 1 -- msi-x bar
1812 * region 2 -- virtio modern io bar (off by default)
1813 * region 4+5 -- virtio modern memory (64bit) bar
1814 *
1815 */
1816 proxy->legacy_io_bar_idx = 0;
1817 proxy->msix_bar_idx = 1;
1818 proxy->modern_io_bar_idx = 2;
1819 proxy->modern_mem_bar_idx = 4;
1820
1821 proxy->common.offset = 0x0;
1822 proxy->common.size = 0x1000;
1823 proxy->common.type = VIRTIO_PCI_CAP_COMMON_CFG;
1824
1825 proxy->isr.offset = 0x1000;
1826 proxy->isr.size = 0x1000;
1827 proxy->isr.type = VIRTIO_PCI_CAP_ISR_CFG;
1828
1829 proxy->device.offset = 0x2000;
1830 proxy->device.size = 0x1000;
1831 proxy->device.type = VIRTIO_PCI_CAP_DEVICE_CFG;
1832
1833 proxy->notify.offset = 0x3000;
1834 proxy->notify.size = virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX;
1835 proxy->notify.type = VIRTIO_PCI_CAP_NOTIFY_CFG;
1836
1837 proxy->notify_pio.offset = 0x0;
1838 proxy->notify_pio.size = 0x4;
1839 proxy->notify_pio.type = VIRTIO_PCI_CAP_NOTIFY_CFG;
1840
1841 /* subclasses can enforce modern, so do this unconditionally */
1842 memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci",
1843 /* PCI BAR regions must be powers of 2 */
1844 pow2ceil(proxy->notify.offset + proxy->notify.size));
1845
1846 if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) {
1847 proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
1848 }
1849
1850 if (!virtio_pci_modern(proxy) && !virtio_pci_legacy(proxy)) {
1851 error_setg(errp, "device cannot work as neither modern nor legacy mode"
1852 " is enabled");
1853 error_append_hint(errp, "Set either disable-modern or disable-legacy"
1854 " to off\n");
1855 return;
1856 }
1857
1858 if (pcie_port && pci_is_express(pci_dev)) {
1859 int pos;
1860 uint16_t last_pcie_cap_offset = PCI_CONFIG_SPACE_SIZE;
1861
1862 pos = pcie_endpoint_cap_init(pci_dev, 0);
1863 assert(pos > 0);
1864
1865 pos = pci_add_capability(pci_dev, PCI_CAP_ID_PM, 0,
1866 PCI_PM_SIZEOF, errp);
1867 if (pos < 0) {
1868 return;
1869 }
1870
1871 pci_dev->exp.pm_cap = pos;
1872
1873 /*
1874 * Indicates that this function complies with revision 1.2 of the
1875 * PCI Power Management Interface Specification.
1876 */
1877 pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3);
1878
1879 if (proxy->flags & VIRTIO_PCI_FLAG_AER) {
1880 pcie_aer_init(pci_dev, PCI_ERR_VER, last_pcie_cap_offset,
1881 PCI_ERR_SIZEOF, NULL);
1882 last_pcie_cap_offset += PCI_ERR_SIZEOF;
1883 }
1884
1885 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_DEVERR) {
1886 /* Init error enabling flags */
1887 pcie_cap_deverr_init(pci_dev);
1888 }
1889
1890 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_LNKCTL) {
1891 /* Init Link Control Register */
1892 pcie_cap_lnkctl_init(pci_dev);
1893 }
1894
1895 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_PM) {
1896 /* Init Power Management Control Register */
1897 pci_set_word(pci_dev->wmask + pos + PCI_PM_CTRL,
1898 PCI_PM_CTRL_STATE_MASK);
1899 }
1900
1901 if (proxy->flags & VIRTIO_PCI_FLAG_ATS) {
1902 pcie_ats_init(pci_dev, last_pcie_cap_offset,
1903 proxy->flags & VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED);
1904 last_pcie_cap_offset += PCI_EXT_CAP_ATS_SIZEOF;
1905 }
1906
1907 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) {
1908 /* Set Function Level Reset capability bit */
1909 pcie_cap_flr_init(pci_dev);
1910 }
1911 } else {
1912 /*
1913 * make future invocations of pci_is_express() return false
1914 * and pci_config_size() return PCI_CONFIG_SPACE_SIZE.
1915 */
1916 pci_dev->cap_present &= ~QEMU_PCI_CAP_EXPRESS;
1917 }
1918
1919 virtio_pci_bus_new(&proxy->bus, sizeof(proxy->bus), proxy);
1920 if (k->realize) {
1921 k->realize(proxy, errp);
1922 }
1923 }
1924
1925 static void virtio_pci_exit(PCIDevice *pci_dev)
1926 {
1927 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
1928 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) &&
1929 !pci_bus_is_root(pci_get_bus(pci_dev));
1930
1931 msix_uninit_exclusive_bar(pci_dev);
1932 if (proxy->flags & VIRTIO_PCI_FLAG_AER && pcie_port &&
1933 pci_is_express(pci_dev)) {
1934 pcie_aer_exit(pci_dev);
1935 }
1936 }
1937
1938 static void virtio_pci_reset(DeviceState *qdev)
1939 {
1940 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
1941 VirtioBusState *bus = VIRTIO_BUS(&proxy->bus);
1942 PCIDevice *dev = PCI_DEVICE(qdev);
1943 int i;
1944
1945 virtio_pci_stop_ioeventfd(proxy);
1946 virtio_bus_reset(bus);
1947 msix_unuse_all_vectors(&proxy->pci_dev);
1948
1949 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
1950 proxy->vqs[i].enabled = 0;
1951 proxy->vqs[i].num = 0;
1952 proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0;
1953 proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0;
1954 proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0;
1955 }
1956
1957 if (pci_is_express(dev)) {
1958 pcie_cap_deverr_reset(dev);
1959 pcie_cap_lnkctl_reset(dev);
1960
1961 pci_set_word(dev->config + dev->exp.pm_cap + PCI_PM_CTRL, 0);
1962 }
1963 }
1964
1965 static Property virtio_pci_properties[] = {
1966 DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags,
1967 VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false),
1968 DEFINE_PROP_BIT("migrate-extra", VirtIOPCIProxy, flags,
1969 VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT, true),
1970 DEFINE_PROP_BIT("modern-pio-notify", VirtIOPCIProxy, flags,
1971 VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT, false),
1972 DEFINE_PROP_BIT("x-disable-pcie", VirtIOPCIProxy, flags,
1973 VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT, false),
1974 DEFINE_PROP_BIT("page-per-vq", VirtIOPCIProxy, flags,
1975 VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT, false),
1976 DEFINE_PROP_BOOL("x-ignore-backend-features", VirtIOPCIProxy,
1977 ignore_backend_features, false),
1978 DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags,
1979 VIRTIO_PCI_FLAG_ATS_BIT, false),
1980 DEFINE_PROP_BIT("x-ats-page-aligned", VirtIOPCIProxy, flags,
1981 VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, true),
1982 DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags,
1983 VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true),
1984 DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags,
1985 VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true),
1986 DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags,
1987 VIRTIO_PCI_FLAG_INIT_PM_BIT, true),
1988 DEFINE_PROP_BIT("x-pcie-flr-init", VirtIOPCIProxy, flags,
1989 VIRTIO_PCI_FLAG_INIT_FLR_BIT, true),
1990 DEFINE_PROP_BIT("aer", VirtIOPCIProxy, flags,
1991 VIRTIO_PCI_FLAG_AER_BIT, false),
1992 DEFINE_PROP_END_OF_LIST(),
1993 };
1994
1995 static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp)
1996 {
1997 VirtioPCIClass *vpciklass = VIRTIO_PCI_GET_CLASS(qdev);
1998 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
1999 PCIDevice *pci_dev = &proxy->pci_dev;
2000
2001 if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) &&
2002 virtio_pci_modern(proxy)) {
2003 pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
2004 }
2005
2006 vpciklass->parent_dc_realize(qdev, errp);
2007 }
2008
2009 static void virtio_pci_class_init(ObjectClass *klass, void *data)
2010 {
2011 DeviceClass *dc = DEVICE_CLASS(klass);
2012 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
2013 VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass);
2014
2015 device_class_set_props(dc, virtio_pci_properties);
2016 k->realize = virtio_pci_realize;
2017 k->exit = virtio_pci_exit;
2018 k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
2019 k->revision = VIRTIO_PCI_ABI_VERSION;
2020 k->class_id = PCI_CLASS_OTHERS;
2021 device_class_set_parent_realize(dc, virtio_pci_dc_realize,
2022 &vpciklass->parent_dc_realize);
2023 dc->reset = virtio_pci_reset;
2024 }
2025
2026 static const TypeInfo virtio_pci_info = {
2027 .name = TYPE_VIRTIO_PCI,
2028 .parent = TYPE_PCI_DEVICE,
2029 .instance_size = sizeof(VirtIOPCIProxy),
2030 .class_init = virtio_pci_class_init,
2031 .class_size = sizeof(VirtioPCIClass),
2032 .abstract = true,
2033 };
2034
2035 static Property virtio_pci_generic_properties[] = {
2036 DEFINE_PROP_ON_OFF_AUTO("disable-legacy", VirtIOPCIProxy, disable_legacy,
2037 ON_OFF_AUTO_AUTO),
2038 DEFINE_PROP_BOOL("disable-modern", VirtIOPCIProxy, disable_modern, false),
2039 DEFINE_PROP_END_OF_LIST(),
2040 };
2041
2042 static void virtio_pci_base_class_init(ObjectClass *klass, void *data)
2043 {
2044 const VirtioPCIDeviceTypeInfo *t = data;
2045 if (t->class_init) {
2046 t->class_init(klass, NULL);
2047 }
2048 }
2049
2050 static void virtio_pci_generic_class_init(ObjectClass *klass, void *data)
2051 {
2052 DeviceClass *dc = DEVICE_CLASS(klass);
2053
2054 device_class_set_props(dc, virtio_pci_generic_properties);
2055 }
2056
2057 static void virtio_pci_transitional_instance_init(Object *obj)
2058 {
2059 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj);
2060
2061 proxy->disable_legacy = ON_OFF_AUTO_OFF;
2062 proxy->disable_modern = false;
2063 }
2064
2065 static void virtio_pci_non_transitional_instance_init(Object *obj)
2066 {
2067 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj);
2068
2069 proxy->disable_legacy = ON_OFF_AUTO_ON;
2070 proxy->disable_modern = false;
2071 }
2072
2073 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t)
2074 {
2075 char *base_name = NULL;
2076 TypeInfo base_type_info = {
2077 .name = t->base_name,
2078 .parent = t->parent ? t->parent : TYPE_VIRTIO_PCI,
2079 .instance_size = t->instance_size,
2080 .instance_init = t->instance_init,
2081 .class_size = t->class_size,
2082 .abstract = true,
2083 .interfaces = t->interfaces,
2084 };
2085 TypeInfo generic_type_info = {
2086 .name = t->generic_name,
2087 .parent = base_type_info.name,
2088 .class_init = virtio_pci_generic_class_init,
2089 .interfaces = (InterfaceInfo[]) {
2090 { INTERFACE_PCIE_DEVICE },
2091 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
2092 { }
2093 },
2094 };
2095
2096 if (!base_type_info.name) {
2097 /* No base type -> register a single generic device type */
2098 /* use intermediate %s-base-type to add generic device props */
2099 base_name = g_strdup_printf("%s-base-type", t->generic_name);
2100 base_type_info.name = base_name;
2101 base_type_info.class_init = virtio_pci_generic_class_init;
2102
2103 generic_type_info.parent = base_name;
2104 generic_type_info.class_init = virtio_pci_base_class_init;
2105 generic_type_info.class_data = (void *)t;
2106
2107 assert(!t->non_transitional_name);
2108 assert(!t->transitional_name);
2109 } else {
2110 base_type_info.class_init = virtio_pci_base_class_init;
2111 base_type_info.class_data = (void *)t;
2112 }
2113
2114 type_register(&base_type_info);
2115 if (generic_type_info.name) {
2116 type_register(&generic_type_info);
2117 }
2118
2119 if (t->non_transitional_name) {
2120 const TypeInfo non_transitional_type_info = {
2121 .name = t->non_transitional_name,
2122 .parent = base_type_info.name,
2123 .instance_init = virtio_pci_non_transitional_instance_init,
2124 .interfaces = (InterfaceInfo[]) {
2125 { INTERFACE_PCIE_DEVICE },
2126 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
2127 { }
2128 },
2129 };
2130 type_register(&non_transitional_type_info);
2131 }
2132
2133 if (t->transitional_name) {
2134 const TypeInfo transitional_type_info = {
2135 .name = t->transitional_name,
2136 .parent = base_type_info.name,
2137 .instance_init = virtio_pci_transitional_instance_init,
2138 .interfaces = (InterfaceInfo[]) {
2139 /*
2140 * Transitional virtio devices work only as Conventional PCI
2141 * devices because they require PIO ports.
2142 */
2143 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
2144 { }
2145 },
2146 };
2147 type_register(&transitional_type_info);
2148 }
2149 g_free(base_name);
2150 }
2151
2152 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues)
2153 {
2154 /*
2155 * 1:1 vq to vCPU mapping is ideal because the same vCPU that submitted
2156 * virtqueue buffers can handle their completion. When a different vCPU
2157 * handles completion it may need to IPI the vCPU that submitted the
2158 * request and this adds overhead.
2159 *
2160 * Virtqueues consume guest RAM and MSI-X vectors. This is wasteful in
2161 * guests with very many vCPUs and a device that is only used by a few
2162 * vCPUs. Unfortunately optimizing that case requires manual pinning inside
2163 * the guest, so those users might as well manually set the number of
2164 * queues. There is no upper limit that can be applied automatically and
2165 * doing so arbitrarily would result in a sudden performance drop once the
2166 * threshold number of vCPUs is exceeded.
2167 */
2168 unsigned num_queues = current_machine->smp.cpus;
2169
2170 /*
2171 * The maximum number of MSI-X vectors is PCI_MSIX_FLAGS_QSIZE + 1, but the
2172 * config change interrupt and the fixed virtqueues must be taken into
2173 * account too.
2174 */
2175 num_queues = MIN(num_queues, PCI_MSIX_FLAGS_QSIZE - fixed_queues);
2176
2177 /*
2178 * There is a limit to how many virtqueues a device can have.
2179 */
2180 return MIN(num_queues, VIRTIO_QUEUE_MAX - fixed_queues);
2181 }
2182
2183 /* virtio-pci-bus */
2184
2185 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
2186 VirtIOPCIProxy *dev)
2187 {
2188 DeviceState *qdev = DEVICE(dev);
2189 char virtio_bus_name[] = "virtio-bus";
2190
2191 qbus_init(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev, virtio_bus_name);
2192 }
2193
2194 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
2195 {
2196 BusClass *bus_class = BUS_CLASS(klass);
2197 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
2198 bus_class->max_dev = 1;
2199 k->notify = virtio_pci_notify;
2200 k->save_config = virtio_pci_save_config;
2201 k->load_config = virtio_pci_load_config;
2202 k->save_queue = virtio_pci_save_queue;
2203 k->load_queue = virtio_pci_load_queue;
2204 k->save_extra_state = virtio_pci_save_extra_state;
2205 k->load_extra_state = virtio_pci_load_extra_state;
2206 k->has_extra_state = virtio_pci_has_extra_state;
2207 k->query_guest_notifiers = virtio_pci_query_guest_notifiers;
2208 k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
2209 k->set_host_notifier_mr = virtio_pci_set_host_notifier_mr;
2210 k->vmstate_change = virtio_pci_vmstate_change;
2211 k->pre_plugged = virtio_pci_pre_plugged;
2212 k->device_plugged = virtio_pci_device_plugged;
2213 k->device_unplugged = virtio_pci_device_unplugged;
2214 k->query_nvectors = virtio_pci_query_nvectors;
2215 k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled;
2216 k->ioeventfd_assign = virtio_pci_ioeventfd_assign;
2217 k->get_dma_as = virtio_pci_get_dma_as;
2218 k->iommu_enabled = virtio_pci_iommu_enabled;
2219 k->queue_enabled = virtio_pci_queue_enabled;
2220 }
2221
2222 static const TypeInfo virtio_pci_bus_info = {
2223 .name = TYPE_VIRTIO_PCI_BUS,
2224 .parent = TYPE_VIRTIO_BUS,
2225 .instance_size = sizeof(VirtioPCIBusState),
2226 .class_size = sizeof(VirtioPCIBusClass),
2227 .class_init = virtio_pci_bus_class_init,
2228 };
2229
2230 static void virtio_pci_register_types(void)
2231 {
2232 /* Base types: */
2233 type_register_static(&virtio_pci_bus_info);
2234 type_register_static(&virtio_pci_info);
2235 }
2236
2237 type_init(virtio_pci_register_types)
2238
armbru's QEMU hackery