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Revert "virtio-pci: decouple notifier from interrupt process"
[qemu.git] / hw / virtio / virtio-pci.c
blob750aa47ec148267f36ee0d6672cb68b5c5e7fdf2
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 .minimum_version_id_old = 1,
135 .fields = (VMStateField[]) {
136 VMSTATE_END_OF_LIST()
137 },
138 .subsections = (const VMStateDescription*[]) {
139 &vmstate_virtio_pci_modern_state_sub,
140 NULL
141 }
142 };
143
144 static bool virtio_pci_has_extra_state(DeviceState *d)
145 {
146 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
147
148 return proxy->flags & VIRTIO_PCI_FLAG_MIGRATE_EXTRA;
149 }
150
151 static void virtio_pci_save_extra_state(DeviceState *d, QEMUFile *f)
152 {
153 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
154
155 vmstate_save_state(f, &vmstate_virtio_pci, proxy, NULL);
156 }
157
158 static int virtio_pci_load_extra_state(DeviceState *d, QEMUFile *f)
159 {
160 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
161
162 return vmstate_load_state(f, &vmstate_virtio_pci, proxy, 1);
163 }
164
165 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f)
166 {
167 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
168 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
169
170 if (msix_present(&proxy->pci_dev))
171 qemu_put_be16(f, virtio_queue_vector(vdev, n));
172 }
173
174 static int virtio_pci_load_config(DeviceState *d, QEMUFile *f)
175 {
176 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
177 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
178
179 int ret;
180 ret = pci_device_load(&proxy->pci_dev, f);
181 if (ret) {
182 return ret;
183 }
184 msix_unuse_all_vectors(&proxy->pci_dev);
185 msix_load(&proxy->pci_dev, f);
186 if (msix_present(&proxy->pci_dev)) {
187 qemu_get_be16s(f, &vdev->config_vector);
188 } else {
189 vdev->config_vector = VIRTIO_NO_VECTOR;
190 }
191 if (vdev->config_vector != VIRTIO_NO_VECTOR) {
192 return msix_vector_use(&proxy->pci_dev, vdev->config_vector);
193 }
194 return 0;
195 }
196
197 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f)
198 {
199 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
200 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
201
202 uint16_t vector;
203 if (msix_present(&proxy->pci_dev)) {
204 qemu_get_be16s(f, &vector);
205 } else {
206 vector = VIRTIO_NO_VECTOR;
207 }
208 virtio_queue_set_vector(vdev, n, vector);
209 if (vector != VIRTIO_NO_VECTOR) {
210 return msix_vector_use(&proxy->pci_dev, vector);
211 }
212
213 return 0;
214 }
215
216 static bool virtio_pci_ioeventfd_enabled(DeviceState *d)
217 {
218 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
219
220 return (proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) != 0;
221 }
222
223 #define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000
224
225 static inline int virtio_pci_queue_mem_mult(struct VirtIOPCIProxy *proxy)
226 {
227 return (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ) ?
228 QEMU_VIRTIO_PCI_QUEUE_MEM_MULT : 4;
229 }
230
231 static int virtio_pci_ioeventfd_assign(DeviceState *d, EventNotifier *notifier,
232 int n, bool assign)
233 {
234 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
235 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
236 VirtQueue *vq = virtio_get_queue(vdev, n);
237 bool legacy = virtio_pci_legacy(proxy);
238 bool modern = virtio_pci_modern(proxy);
239 bool fast_mmio = kvm_ioeventfd_any_length_enabled();
240 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
241 MemoryRegion *modern_mr = &proxy->notify.mr;
242 MemoryRegion *modern_notify_mr = &proxy->notify_pio.mr;
243 MemoryRegion *legacy_mr = &proxy->bar;
244 hwaddr modern_addr = virtio_pci_queue_mem_mult(proxy) *
245 virtio_get_queue_index(vq);
246 hwaddr legacy_addr = VIRTIO_PCI_QUEUE_NOTIFY;
247
248 if (assign) {
249 if (modern) {
250 if (fast_mmio) {
251 memory_region_add_eventfd(modern_mr, modern_addr, 0,
252 false, n, notifier);
253 } else {
254 memory_region_add_eventfd(modern_mr, modern_addr, 2,
255 false, n, notifier);
256 }
257 if (modern_pio) {
258 memory_region_add_eventfd(modern_notify_mr, 0, 2,
259 true, n, notifier);
260 }
261 }
262 if (legacy) {
263 memory_region_add_eventfd(legacy_mr, legacy_addr, 2,
264 true, n, notifier);
265 }
266 } else {
267 if (modern) {
268 if (fast_mmio) {
269 memory_region_del_eventfd(modern_mr, modern_addr, 0,
270 false, n, notifier);
271 } else {
272 memory_region_del_eventfd(modern_mr, modern_addr, 2,
273 false, n, notifier);
274 }
275 if (modern_pio) {
276 memory_region_del_eventfd(modern_notify_mr, 0, 2,
277 true, n, notifier);
278 }
279 }
280 if (legacy) {
281 memory_region_del_eventfd(legacy_mr, legacy_addr, 2,
282 true, n, notifier);
283 }
284 }
285 return 0;
286 }
287
288 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
289 {
290 virtio_bus_start_ioeventfd(&proxy->bus);
291 }
292
293 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
294 {
295 virtio_bus_stop_ioeventfd(&proxy->bus);
296 }
297
298 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
299 {
300 VirtIOPCIProxy *proxy = opaque;
301 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
302 hwaddr pa;
303
304 switch (addr) {
305 case VIRTIO_PCI_GUEST_FEATURES:
306 /* Guest does not negotiate properly? We have to assume nothing. */
307 if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
308 val = virtio_bus_get_vdev_bad_features(&proxy->bus);
309 }
310 virtio_set_features(vdev, val);
311 break;
312 case VIRTIO_PCI_QUEUE_PFN:
313 pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
314 if (pa == 0) {
315 virtio_pci_reset(DEVICE(proxy));
316 }
317 else
318 virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
319 break;
320 case VIRTIO_PCI_QUEUE_SEL:
321 if (val < VIRTIO_QUEUE_MAX)
322 vdev->queue_sel = val;
323 break;
324 case VIRTIO_PCI_QUEUE_NOTIFY:
325 if (val < VIRTIO_QUEUE_MAX) {
326 virtio_queue_notify(vdev, val);
327 }
328 break;
329 case VIRTIO_PCI_STATUS:
330 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
331 virtio_pci_stop_ioeventfd(proxy);
332 }
333
334 virtio_set_status(vdev, val & 0xFF);
335
336 if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
337 virtio_pci_start_ioeventfd(proxy);
338 }
339
340 if (vdev->status == 0) {
341 virtio_pci_reset(DEVICE(proxy));
342 }
343
344 /* Linux before 2.6.34 drives the device without enabling
345 the PCI device bus master bit. Enable it automatically
346 for the guest. This is a PCI spec violation but so is
347 initiating DMA with bus master bit clear. */
348 if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) {
349 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
350 proxy->pci_dev.config[PCI_COMMAND] |
351 PCI_COMMAND_MASTER, 1);
352 }
353 break;
354 case VIRTIO_MSI_CONFIG_VECTOR:
355 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
356 /* Make it possible for guest to discover an error took place. */
357 if (msix_vector_use(&proxy->pci_dev, val) < 0)
358 val = VIRTIO_NO_VECTOR;
359 vdev->config_vector = val;
360 break;
361 case VIRTIO_MSI_QUEUE_VECTOR:
362 msix_vector_unuse(&proxy->pci_dev,
363 virtio_queue_vector(vdev, vdev->queue_sel));
364 /* Make it possible for guest to discover an error took place. */
365 if (msix_vector_use(&proxy->pci_dev, val) < 0)
366 val = VIRTIO_NO_VECTOR;
367 virtio_queue_set_vector(vdev, vdev->queue_sel, val);
368 break;
369 default:
370 qemu_log_mask(LOG_GUEST_ERROR,
371 "%s: unexpected address 0x%x value 0x%x\n",
372 __func__, addr, val);
373 break;
374 }
375 }
376
377 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
378 {
379 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
380 uint32_t ret = 0xFFFFFFFF;
381
382 switch (addr) {
383 case VIRTIO_PCI_HOST_FEATURES:
384 ret = vdev->host_features;
385 break;
386 case VIRTIO_PCI_GUEST_FEATURES:
387 ret = vdev->guest_features;
388 break;
389 case VIRTIO_PCI_QUEUE_PFN:
390 ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
391 >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
392 break;
393 case VIRTIO_PCI_QUEUE_NUM:
394 ret = virtio_queue_get_num(vdev, vdev->queue_sel);
395 break;
396 case VIRTIO_PCI_QUEUE_SEL:
397 ret = vdev->queue_sel;
398 break;
399 case VIRTIO_PCI_STATUS:
400 ret = vdev->status;
401 break;
402 case VIRTIO_PCI_ISR:
403 /* reading from the ISR also clears it. */
404 ret = qatomic_xchg(&vdev->isr, 0);
405 pci_irq_deassert(&proxy->pci_dev);
406 break;
407 case VIRTIO_MSI_CONFIG_VECTOR:
408 ret = vdev->config_vector;
409 break;
410 case VIRTIO_MSI_QUEUE_VECTOR:
411 ret = virtio_queue_vector(vdev, vdev->queue_sel);
412 break;
413 default:
414 break;
415 }
416
417 return ret;
418 }
419
420 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
421 unsigned size)
422 {
423 VirtIOPCIProxy *proxy = opaque;
424 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
425 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev);
426 uint64_t val = 0;
427
428 if (vdev == NULL) {
429 return UINT64_MAX;
430 }
431
432 if (addr < config) {
433 return virtio_ioport_read(proxy, addr);
434 }
435 addr -= config;
436
437 switch (size) {
438 case 1:
439 val = virtio_config_readb(vdev, addr);
440 break;
441 case 2:
442 val = virtio_config_readw(vdev, addr);
443 if (virtio_is_big_endian(vdev)) {
444 val = bswap16(val);
445 }
446 break;
447 case 4:
448 val = virtio_config_readl(vdev, addr);
449 if (virtio_is_big_endian(vdev)) {
450 val = bswap32(val);
451 }
452 break;
453 }
454 return val;
455 }
456
457 static void virtio_pci_config_write(void *opaque, hwaddr addr,
458 uint64_t val, unsigned size)
459 {
460 VirtIOPCIProxy *proxy = opaque;
461 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev);
462 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
463
464 if (vdev == NULL) {
465 return;
466 }
467
468 if (addr < config) {
469 virtio_ioport_write(proxy, addr, val);
470 return;
471 }
472 addr -= config;
473 /*
474 * Virtio-PCI is odd. Ioports are LE but config space is target native
475 * endian.
476 */
477 switch (size) {
478 case 1:
479 virtio_config_writeb(vdev, addr, val);
480 break;
481 case 2:
482 if (virtio_is_big_endian(vdev)) {
483 val = bswap16(val);
484 }
485 virtio_config_writew(vdev, addr, val);
486 break;
487 case 4:
488 if (virtio_is_big_endian(vdev)) {
489 val = bswap32(val);
490 }
491 virtio_config_writel(vdev, addr, val);
492 break;
493 }
494 }
495
496 static const MemoryRegionOps virtio_pci_config_ops = {
497 .read = virtio_pci_config_read,
498 .write = virtio_pci_config_write,
499 .impl = {
500 .min_access_size = 1,
501 .max_access_size = 4,
502 },
503 .endianness = DEVICE_LITTLE_ENDIAN,
504 };
505
506 static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy,
507 hwaddr *off, int len)
508 {
509 int i;
510 VirtIOPCIRegion *reg;
511
512 for (i = 0; i < ARRAY_SIZE(proxy->regs); ++i) {
513 reg = &proxy->regs[i];
514 if (*off >= reg->offset &&
515 *off + len <= reg->offset + reg->size) {
516 *off -= reg->offset;
517 return &reg->mr;
518 }
519 }
520
521 return NULL;
522 }
523
524 /* Below are generic functions to do memcpy from/to an address space,
525 * without byteswaps, with input validation.
526 *
527 * As regular address_space_* APIs all do some kind of byteswap at least for
528 * some host/target combinations, we are forced to explicitly convert to a
529 * known-endianness integer value.
530 * It doesn't really matter which endian format to go through, so the code
531 * below selects the endian that causes the least amount of work on the given
532 * host.
533 *
534 * Note: host pointer must be aligned.
535 */
536 static
537 void virtio_address_space_write(VirtIOPCIProxy *proxy, hwaddr addr,
538 const uint8_t *buf, int len)
539 {
540 uint64_t val;
541 MemoryRegion *mr;
542
543 /* address_space_* APIs assume an aligned address.
544 * As address is under guest control, handle illegal values.
545 */
546 addr &= ~(len - 1);
547
548 mr = virtio_address_space_lookup(proxy, &addr, len);
549 if (!mr) {
550 return;
551 }
552
553 /* Make sure caller aligned buf properly */
554 assert(!(((uintptr_t)buf) & (len - 1)));
555
556 switch (len) {
557 case 1:
558 val = pci_get_byte(buf);
559 break;
560 case 2:
561 val = pci_get_word(buf);
562 break;
563 case 4:
564 val = pci_get_long(buf);
565 break;
566 default:
567 /* As length is under guest control, handle illegal values. */
568 return;
569 }
570 memory_region_dispatch_write(mr, addr, val, size_memop(len) | MO_LE,
571 MEMTXATTRS_UNSPECIFIED);
572 }
573
574 static void
575 virtio_address_space_read(VirtIOPCIProxy *proxy, hwaddr addr,
576 uint8_t *buf, int len)
577 {
578 uint64_t val;
579 MemoryRegion *mr;
580
581 /* address_space_* APIs assume an aligned address.
582 * As address is under guest control, handle illegal values.
583 */
584 addr &= ~(len - 1);
585
586 mr = virtio_address_space_lookup(proxy, &addr, len);
587 if (!mr) {
588 return;
589 }
590
591 /* Make sure caller aligned buf properly */
592 assert(!(((uintptr_t)buf) & (len - 1)));
593
594 memory_region_dispatch_read(mr, addr, &val, size_memop(len) | MO_LE,
595 MEMTXATTRS_UNSPECIFIED);
596 switch (len) {
597 case 1:
598 pci_set_byte(buf, val);
599 break;
600 case 2:
601 pci_set_word(buf, val);
602 break;
603 case 4:
604 pci_set_long(buf, val);
605 break;
606 default:
607 /* As length is under guest control, handle illegal values. */
608 break;
609 }
610 }
611
612 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
613 uint32_t val, int len)
614 {
615 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
616 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
617 struct virtio_pci_cfg_cap *cfg;
618
619 pci_default_write_config(pci_dev, address, val, len);
620
621 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) {
622 pcie_cap_flr_write_config(pci_dev, address, val, len);
623 }
624
625 if (range_covers_byte(address, len, PCI_COMMAND)) {
626 if (!(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
627 virtio_set_disabled(vdev, true);
628 virtio_pci_stop_ioeventfd(proxy);
629 virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
630 } else {
631 virtio_set_disabled(vdev, false);
632 }
633 }
634
635 if (proxy->config_cap &&
636 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap,
637 pci_cfg_data),
638 sizeof cfg->pci_cfg_data)) {
639 uint32_t off;
640 uint32_t len;
641
642 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap);
643 off = le32_to_cpu(cfg->cap.offset);
644 len = le32_to_cpu(cfg->cap.length);
645
646 if (len == 1 || len == 2 || len == 4) {
647 assert(len <= sizeof cfg->pci_cfg_data);
648 virtio_address_space_write(proxy, off, cfg->pci_cfg_data, len);
649 }
650 }
651 }
652
653 static uint32_t virtio_read_config(PCIDevice *pci_dev,
654 uint32_t address, int len)
655 {
656 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
657 struct virtio_pci_cfg_cap *cfg;
658
659 if (proxy->config_cap &&
660 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap,
661 pci_cfg_data),
662 sizeof cfg->pci_cfg_data)) {
663 uint32_t off;
664 uint32_t len;
665
666 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap);
667 off = le32_to_cpu(cfg->cap.offset);
668 len = le32_to_cpu(cfg->cap.length);
669
670 if (len == 1 || len == 2 || len == 4) {
671 assert(len <= sizeof cfg->pci_cfg_data);
672 virtio_address_space_read(proxy, off, cfg->pci_cfg_data, len);
673 }
674 }
675
676 return pci_default_read_config(pci_dev, address, len);
677 }
678
679 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
680 unsigned int queue_no,
681 unsigned int vector)
682 {
683 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
684 int ret;
685
686 if (irqfd->users == 0) {
687 ret = kvm_irqchip_add_msi_route(kvm_state, vector, &proxy->pci_dev);
688 if (ret < 0) {
689 return ret;
690 }
691 irqfd->virq = ret;
692 }
693 irqfd->users++;
694 return 0;
695 }
696
697 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
698 unsigned int vector)
699 {
700 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
701 if (--irqfd->users == 0) {
702 kvm_irqchip_release_virq(kvm_state, irqfd->virq);
703 }
704 }
705
706 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
707 unsigned int queue_no,
708 unsigned int vector)
709 {
710 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
711 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
712 VirtQueue *vq = virtio_get_queue(vdev, queue_no);
713 EventNotifier *n = virtio_queue_get_guest_notifier(vq);
714 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq);
715 }
716
717 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
718 unsigned int queue_no,
719 unsigned int vector)
720 {
721 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
722 VirtQueue *vq = virtio_get_queue(vdev, queue_no);
723 EventNotifier *n = virtio_queue_get_guest_notifier(vq);
724 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
725 int ret;
726
727 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->virq);
728 assert(ret == 0);
729 }
730
731 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
732 {
733 PCIDevice *dev = &proxy->pci_dev;
734 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
735 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
736 unsigned int vector;
737 int ret, queue_no;
738
739 for (queue_no = 0; queue_no < nvqs; queue_no++) {
740 if (!virtio_queue_get_num(vdev, queue_no)) {
741 break;
742 }
743 vector = virtio_queue_vector(vdev, queue_no);
744 if (vector >= msix_nr_vectors_allocated(dev)) {
745 continue;
746 }
747 ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector);
748 if (ret < 0) {
749 goto undo;
750 }
751 /* If guest supports masking, set up irqfd now.
752 * Otherwise, delay until unmasked in the frontend.
753 */
754 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
755 ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
756 if (ret < 0) {
757 kvm_virtio_pci_vq_vector_release(proxy, vector);
758 goto undo;
759 }
760 }
761 }
762 return 0;
763
764 undo:
765 while (--queue_no >= 0) {
766 vector = virtio_queue_vector(vdev, queue_no);
767 if (vector >= msix_nr_vectors_allocated(dev)) {
768 continue;
769 }
770 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
771 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
772 }
773 kvm_virtio_pci_vq_vector_release(proxy, vector);
774 }
775 return ret;
776 }
777
778 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
779 {
780 PCIDevice *dev = &proxy->pci_dev;
781 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
782 unsigned int vector;
783 int queue_no;
784 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
785
786 for (queue_no = 0; queue_no < nvqs; queue_no++) {
787 if (!virtio_queue_get_num(vdev, queue_no)) {
788 break;
789 }
790 vector = virtio_queue_vector(vdev, queue_no);
791 if (vector >= msix_nr_vectors_allocated(dev)) {
792 continue;
793 }
794 /* If guest supports masking, clean up irqfd now.
795 * Otherwise, it was cleaned when masked in the frontend.
796 */
797 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
798 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
799 }
800 kvm_virtio_pci_vq_vector_release(proxy, vector);
801 }
802 }
803
804 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
805 unsigned int queue_no,
806 unsigned int vector,
807 MSIMessage msg)
808 {
809 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
810 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
811 VirtQueue *vq = virtio_get_queue(vdev, queue_no);
812 EventNotifier *n = virtio_queue_get_guest_notifier(vq);
813 VirtIOIRQFD *irqfd;
814 int ret = 0;
815
816 if (proxy->vector_irqfd) {
817 irqfd = &proxy->vector_irqfd[vector];
818 if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) {
819 ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg,
820 &proxy->pci_dev);
821 if (ret < 0) {
822 return ret;
823 }
824 kvm_irqchip_commit_routes(kvm_state);
825 }
826 }
827
828 /* If guest supports masking, irqfd is already setup, unmask it.
829 * Otherwise, set it up now.
830 */
831 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
832 k->guest_notifier_mask(vdev, queue_no, false);
833 /* Test after unmasking to avoid losing events. */
834 if (k->guest_notifier_pending &&
835 k->guest_notifier_pending(vdev, queue_no)) {
836 event_notifier_set(n);
837 }
838 } else {
839 ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
840 }
841 return ret;
842 }
843
844 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
845 unsigned int queue_no,
846 unsigned int vector)
847 {
848 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
849 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
850
851 /* If guest supports masking, keep irqfd but mask it.
852 * Otherwise, clean it up now.
853 */
854 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) {
855 k->guest_notifier_mask(vdev, queue_no, true);
856 } else {
857 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
858 }
859 }
860
861 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
862 MSIMessage msg)
863 {
864 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
865 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
866 VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
867 int ret, index, unmasked = 0;
868
869 while (vq) {
870 index = virtio_get_queue_index(vq);
871 if (!virtio_queue_get_num(vdev, index)) {
872 break;
873 }
874 if (index < proxy->nvqs_with_notifiers) {
875 ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg);
876 if (ret < 0) {
877 goto undo;
878 }
879 ++unmasked;
880 }
881 vq = virtio_vector_next_queue(vq);
882 }
883
884 return 0;
885
886 undo:
887 vq = virtio_vector_first_queue(vdev, vector);
888 while (vq && unmasked >= 0) {
889 index = virtio_get_queue_index(vq);
890 if (index < proxy->nvqs_with_notifiers) {
891 virtio_pci_vq_vector_mask(proxy, index, vector);
892 --unmasked;
893 }
894 vq = virtio_vector_next_queue(vq);
895 }
896 return ret;
897 }
898
899 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
900 {
901 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
902 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
903 VirtQueue *vq = virtio_vector_first_queue(vdev, vector);
904 int index;
905
906 while (vq) {
907 index = virtio_get_queue_index(vq);
908 if (!virtio_queue_get_num(vdev, index)) {
909 break;
910 }
911 if (index < proxy->nvqs_with_notifiers) {
912 virtio_pci_vq_vector_mask(proxy, index, vector);
913 }
914 vq = virtio_vector_next_queue(vq);
915 }
916 }
917
918 static void virtio_pci_vector_poll(PCIDevice *dev,
919 unsigned int vector_start,
920 unsigned int vector_end)
921 {
922 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
923 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
924 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
925 int queue_no;
926 unsigned int vector;
927 EventNotifier *notifier;
928 VirtQueue *vq;
929
930 for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
931 if (!virtio_queue_get_num(vdev, queue_no)) {
932 break;
933 }
934 vector = virtio_queue_vector(vdev, queue_no);
935 if (vector < vector_start || vector >= vector_end ||
936 !msix_is_masked(dev, vector)) {
937 continue;
938 }
939 vq = virtio_get_queue(vdev, queue_no);
940 notifier = virtio_queue_get_guest_notifier(vq);
941 if (k->guest_notifier_pending) {
942 if (k->guest_notifier_pending(vdev, queue_no)) {
943 msix_set_pending(dev, vector);
944 }
945 } else if (event_notifier_test_and_clear(notifier)) {
946 msix_set_pending(dev, vector);
947 }
948 }
949 }
950
951 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
952 bool with_irqfd)
953 {
954 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
955 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
956 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
957 VirtQueue *vq = virtio_get_queue(vdev, n);
958 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
959
960 if (assign) {
961 int r = event_notifier_init(notifier, 0);
962 if (r < 0) {
963 return r;
964 }
965 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
966 } else {
967 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
968 event_notifier_cleanup(notifier);
969 }
970
971 if (!msix_enabled(&proxy->pci_dev) &&
972 vdev->use_guest_notifier_mask &&
973 vdc->guest_notifier_mask) {
974 vdc->guest_notifier_mask(vdev, n, !assign);
975 }
976
977 return 0;
978 }
979
980 static bool virtio_pci_query_guest_notifiers(DeviceState *d)
981 {
982 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
983 return msix_enabled(&proxy->pci_dev);
984 }
985
986 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
987 {
988 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
989 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
990 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
991 int r, n;
992 bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
993 kvm_msi_via_irqfd_enabled();
994
995 nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX);
996
997 /* When deassigning, pass a consistent nvqs value
998 * to avoid leaking notifiers.
999 */
1000 assert(assign || nvqs == proxy->nvqs_with_notifiers);
1001
1002 proxy->nvqs_with_notifiers = nvqs;
1003
1004 /* Must unset vector notifier while guest notifier is still assigned */
1005 if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) {
1006 msix_unset_vector_notifiers(&proxy->pci_dev);
1007 if (proxy->vector_irqfd) {
1008 kvm_virtio_pci_vector_release(proxy, nvqs);
1009 g_free(proxy->vector_irqfd);
1010 proxy->vector_irqfd = NULL;
1011 }
1012 }
1013
1014 for (n = 0; n < nvqs; n++) {
1015 if (!virtio_queue_get_num(vdev, n)) {
1016 break;
1017 }
1018
1019 r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd);
1020 if (r < 0) {
1021 goto assign_error;
1022 }
1023 }
1024
1025 /* Must set vector notifier after guest notifier has been assigned */
1026 if ((with_irqfd || k->guest_notifier_mask) && assign) {
1027 if (with_irqfd) {
1028 proxy->vector_irqfd =
1029 g_malloc0(sizeof(*proxy->vector_irqfd) *
1030 msix_nr_vectors_allocated(&proxy->pci_dev));
1031 r = kvm_virtio_pci_vector_use(proxy, nvqs);
1032 if (r < 0) {
1033 goto assign_error;
1034 }
1035 }
1036 r = msix_set_vector_notifiers(&proxy->pci_dev,
1037 virtio_pci_vector_unmask,
1038 virtio_pci_vector_mask,
1039 virtio_pci_vector_poll);
1040 if (r < 0) {
1041 goto notifiers_error;
1042 }
1043 }
1044
1045 return 0;
1046
1047 notifiers_error:
1048 if (with_irqfd) {
1049 assert(assign);
1050 kvm_virtio_pci_vector_release(proxy, nvqs);
1051 }
1052
1053 assign_error:
1054 /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
1055 assert(assign);
1056 while (--n >= 0) {
1057 virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd);
1058 }
1059 return r;
1060 }
1061
1062 static int virtio_pci_set_host_notifier_mr(DeviceState *d, int n,
1063 MemoryRegion *mr, bool assign)
1064 {
1065 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
1066 int offset;
1067
1068 if (n >= VIRTIO_QUEUE_MAX || !virtio_pci_modern(proxy) ||
1069 virtio_pci_queue_mem_mult(proxy) != memory_region_size(mr)) {
1070 return -1;
1071 }
1072
1073 if (assign) {
1074 offset = virtio_pci_queue_mem_mult(proxy) * n;
1075 memory_region_add_subregion_overlap(&proxy->notify.mr, offset, mr, 1);
1076 } else {
1077 memory_region_del_subregion(&proxy->notify.mr, mr);
1078 }
1079
1080 return 0;
1081 }
1082
1083 static void virtio_pci_vmstate_change(DeviceState *d, bool running)
1084 {
1085 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
1086 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1087
1088 if (running) {
1089 /* Old QEMU versions did not set bus master enable on status write.
1090 * Detect DRIVER set and enable it.
1091 */
1092 if ((proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION) &&
1093 (vdev->status & VIRTIO_CONFIG_S_DRIVER) &&
1094 !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
1095 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
1096 proxy->pci_dev.config[PCI_COMMAND] |
1097 PCI_COMMAND_MASTER, 1);
1098 }
1099 virtio_pci_start_ioeventfd(proxy);
1100 } else {
1101 virtio_pci_stop_ioeventfd(proxy);
1102 }
1103 }
1104
1105 /*
1106 * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
1107 */
1108
1109 static int virtio_pci_query_nvectors(DeviceState *d)
1110 {
1111 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1112
1113 return proxy->nvectors;
1114 }
1115
1116 static AddressSpace *virtio_pci_get_dma_as(DeviceState *d)
1117 {
1118 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1119 PCIDevice *dev = &proxy->pci_dev;
1120
1121 return pci_get_address_space(dev);
1122 }
1123
1124 static bool virtio_pci_iommu_enabled(DeviceState *d)
1125 {
1126 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1127 PCIDevice *dev = &proxy->pci_dev;
1128 AddressSpace *dma_as = pci_device_iommu_address_space(dev);
1129
1130 if (dma_as == &address_space_memory) {
1131 return false;
1132 }
1133
1134 return true;
1135 }
1136
1137 static bool virtio_pci_queue_enabled(DeviceState *d, int n)
1138 {
1139 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1140 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1141
1142 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1143 return proxy->vqs[n].enabled;
1144 }
1145
1146 return virtio_queue_enabled_legacy(vdev, n);
1147 }
1148
1149 static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy,
1150 struct virtio_pci_cap *cap)
1151 {
1152 PCIDevice *dev = &proxy->pci_dev;
1153 int offset;
1154
1155 offset = pci_add_capability(dev, PCI_CAP_ID_VNDR, 0,
1156 cap->cap_len, &error_abort);
1157
1158 assert(cap->cap_len >= sizeof *cap);
1159 memcpy(dev->config + offset + PCI_CAP_FLAGS, &cap->cap_len,
1160 cap->cap_len - PCI_CAP_FLAGS);
1161
1162 return offset;
1163 }
1164
1165 static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr,
1166 unsigned size)
1167 {
1168 VirtIOPCIProxy *proxy = opaque;
1169 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1170 uint32_t val = 0;
1171 int i;
1172
1173 if (vdev == NULL) {
1174 return UINT64_MAX;
1175 }
1176
1177 switch (addr) {
1178 case VIRTIO_PCI_COMMON_DFSELECT:
1179 val = proxy->dfselect;
1180 break;
1181 case VIRTIO_PCI_COMMON_DF:
1182 if (proxy->dfselect <= 1) {
1183 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
1184
1185 val = (vdev->host_features & ~vdc->legacy_features) >>
1186 (32 * proxy->dfselect);
1187 }
1188 break;
1189 case VIRTIO_PCI_COMMON_GFSELECT:
1190 val = proxy->gfselect;
1191 break;
1192 case VIRTIO_PCI_COMMON_GF:
1193 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) {
1194 val = proxy->guest_features[proxy->gfselect];
1195 }
1196 break;
1197 case VIRTIO_PCI_COMMON_MSIX:
1198 val = vdev->config_vector;
1199 break;
1200 case VIRTIO_PCI_COMMON_NUMQ:
1201 for (i = 0; i < VIRTIO_QUEUE_MAX; ++i) {
1202 if (virtio_queue_get_num(vdev, i)) {
1203 val = i + 1;
1204 }
1205 }
1206 break;
1207 case VIRTIO_PCI_COMMON_STATUS:
1208 val = vdev->status;
1209 break;
1210 case VIRTIO_PCI_COMMON_CFGGENERATION:
1211 val = vdev->generation;
1212 break;
1213 case VIRTIO_PCI_COMMON_Q_SELECT:
1214 val = vdev->queue_sel;
1215 break;
1216 case VIRTIO_PCI_COMMON_Q_SIZE:
1217 val = virtio_queue_get_num(vdev, vdev->queue_sel);
1218 break;
1219 case VIRTIO_PCI_COMMON_Q_MSIX:
1220 val = virtio_queue_vector(vdev, vdev->queue_sel);
1221 break;
1222 case VIRTIO_PCI_COMMON_Q_ENABLE:
1223 val = proxy->vqs[vdev->queue_sel].enabled;
1224 break;
1225 case VIRTIO_PCI_COMMON_Q_NOFF:
1226 /* Simply map queues in order */
1227 val = vdev->queue_sel;
1228 break;
1229 case VIRTIO_PCI_COMMON_Q_DESCLO:
1230 val = proxy->vqs[vdev->queue_sel].desc[0];
1231 break;
1232 case VIRTIO_PCI_COMMON_Q_DESCHI:
1233 val = proxy->vqs[vdev->queue_sel].desc[1];
1234 break;
1235 case VIRTIO_PCI_COMMON_Q_AVAILLO:
1236 val = proxy->vqs[vdev->queue_sel].avail[0];
1237 break;
1238 case VIRTIO_PCI_COMMON_Q_AVAILHI:
1239 val = proxy->vqs[vdev->queue_sel].avail[1];
1240 break;
1241 case VIRTIO_PCI_COMMON_Q_USEDLO:
1242 val = proxy->vqs[vdev->queue_sel].used[0];
1243 break;
1244 case VIRTIO_PCI_COMMON_Q_USEDHI:
1245 val = proxy->vqs[vdev->queue_sel].used[1];
1246 break;
1247 default:
1248 val = 0;
1249 }
1250
1251 return val;
1252 }
1253
1254 static void virtio_pci_common_write(void *opaque, hwaddr addr,
1255 uint64_t val, unsigned size)
1256 {
1257 VirtIOPCIProxy *proxy = opaque;
1258 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1259
1260 if (vdev == NULL) {
1261 return;
1262 }
1263
1264 switch (addr) {
1265 case VIRTIO_PCI_COMMON_DFSELECT:
1266 proxy->dfselect = val;
1267 break;
1268 case VIRTIO_PCI_COMMON_GFSELECT:
1269 proxy->gfselect = val;
1270 break;
1271 case VIRTIO_PCI_COMMON_GF:
1272 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) {
1273 proxy->guest_features[proxy->gfselect] = val;
1274 virtio_set_features(vdev,
1275 (((uint64_t)proxy->guest_features[1]) << 32) |
1276 proxy->guest_features[0]);
1277 }
1278 break;
1279 case VIRTIO_PCI_COMMON_MSIX:
1280 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
1281 /* Make it possible for guest to discover an error took place. */
1282 if (msix_vector_use(&proxy->pci_dev, val) < 0) {
1283 val = VIRTIO_NO_VECTOR;
1284 }
1285 vdev->config_vector = val;
1286 break;
1287 case VIRTIO_PCI_COMMON_STATUS:
1288 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
1289 virtio_pci_stop_ioeventfd(proxy);
1290 }
1291
1292 virtio_set_status(vdev, val & 0xFF);
1293
1294 if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
1295 virtio_pci_start_ioeventfd(proxy);
1296 }
1297
1298 if (vdev->status == 0) {
1299 virtio_pci_reset(DEVICE(proxy));
1300 }
1301
1302 break;
1303 case VIRTIO_PCI_COMMON_Q_SELECT:
1304 if (val < VIRTIO_QUEUE_MAX) {
1305 vdev->queue_sel = val;
1306 }
1307 break;
1308 case VIRTIO_PCI_COMMON_Q_SIZE:
1309 proxy->vqs[vdev->queue_sel].num = val;
1310 virtio_queue_set_num(vdev, vdev->queue_sel,
1311 proxy->vqs[vdev->queue_sel].num);
1312 break;
1313 case VIRTIO_PCI_COMMON_Q_MSIX:
1314 msix_vector_unuse(&proxy->pci_dev,
1315 virtio_queue_vector(vdev, vdev->queue_sel));
1316 /* Make it possible for guest to discover an error took place. */
1317 if (msix_vector_use(&proxy->pci_dev, val) < 0) {
1318 val = VIRTIO_NO_VECTOR;
1319 }
1320 virtio_queue_set_vector(vdev, vdev->queue_sel, val);
1321 break;
1322 case VIRTIO_PCI_COMMON_Q_ENABLE:
1323 if (val == 1) {
1324 virtio_queue_set_num(vdev, vdev->queue_sel,
1325 proxy->vqs[vdev->queue_sel].num);
1326 virtio_queue_set_rings(vdev, vdev->queue_sel,
1327 ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 |
1328 proxy->vqs[vdev->queue_sel].desc[0],
1329 ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 |
1330 proxy->vqs[vdev->queue_sel].avail[0],
1331 ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 |
1332 proxy->vqs[vdev->queue_sel].used[0]);
1333 proxy->vqs[vdev->queue_sel].enabled = 1;
1334 } else {
1335 virtio_error(vdev, "wrong value for queue_enable %"PRIx64, val);
1336 }
1337 break;
1338 case VIRTIO_PCI_COMMON_Q_DESCLO:
1339 proxy->vqs[vdev->queue_sel].desc[0] = val;
1340 break;
1341 case VIRTIO_PCI_COMMON_Q_DESCHI:
1342 proxy->vqs[vdev->queue_sel].desc[1] = val;
1343 break;
1344 case VIRTIO_PCI_COMMON_Q_AVAILLO:
1345 proxy->vqs[vdev->queue_sel].avail[0] = val;
1346 break;
1347 case VIRTIO_PCI_COMMON_Q_AVAILHI:
1348 proxy->vqs[vdev->queue_sel].avail[1] = val;
1349 break;
1350 case VIRTIO_PCI_COMMON_Q_USEDLO:
1351 proxy->vqs[vdev->queue_sel].used[0] = val;
1352 break;
1353 case VIRTIO_PCI_COMMON_Q_USEDHI:
1354 proxy->vqs[vdev->queue_sel].used[1] = val;
1355 break;
1356 default:
1357 break;
1358 }
1359 }
1360
1361
1362 static uint64_t virtio_pci_notify_read(void *opaque, hwaddr addr,
1363 unsigned size)
1364 {
1365 VirtIOPCIProxy *proxy = opaque;
1366 if (virtio_bus_get_device(&proxy->bus) == NULL) {
1367 return UINT64_MAX;
1368 }
1369
1370 return 0;
1371 }
1372
1373 static void virtio_pci_notify_write(void *opaque, hwaddr addr,
1374 uint64_t val, unsigned size)
1375 {
1376 VirtIOPCIProxy *proxy = opaque;
1377 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1378
1379 unsigned queue = addr / virtio_pci_queue_mem_mult(proxy);
1380
1381 if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) {
1382 virtio_queue_notify(vdev, queue);
1383 }
1384 }
1385
1386 static void virtio_pci_notify_write_pio(void *opaque, hwaddr addr,
1387 uint64_t val, unsigned size)
1388 {
1389 VirtIOPCIProxy *proxy = opaque;
1390 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1391
1392 unsigned queue = val;
1393
1394 if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) {
1395 virtio_queue_notify(vdev, queue);
1396 }
1397 }
1398
1399 static uint64_t virtio_pci_isr_read(void *opaque, hwaddr addr,
1400 unsigned size)
1401 {
1402 VirtIOPCIProxy *proxy = opaque;
1403 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1404 uint64_t val;
1405
1406 if (vdev == NULL) {
1407 return UINT64_MAX;
1408 }
1409
1410 val = qatomic_xchg(&vdev->isr, 0);
1411 pci_irq_deassert(&proxy->pci_dev);
1412 return val;
1413 }
1414
1415 static void virtio_pci_isr_write(void *opaque, hwaddr addr,
1416 uint64_t val, unsigned size)
1417 {
1418 }
1419
1420 static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr,
1421 unsigned size)
1422 {
1423 VirtIOPCIProxy *proxy = opaque;
1424 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1425 uint64_t val;
1426
1427 if (vdev == NULL) {
1428 return UINT64_MAX;
1429 }
1430
1431 switch (size) {
1432 case 1:
1433 val = virtio_config_modern_readb(vdev, addr);
1434 break;
1435 case 2:
1436 val = virtio_config_modern_readw(vdev, addr);
1437 break;
1438 case 4:
1439 val = virtio_config_modern_readl(vdev, addr);
1440 break;
1441 default:
1442 val = 0;
1443 break;
1444 }
1445 return val;
1446 }
1447
1448 static void virtio_pci_device_write(void *opaque, hwaddr addr,
1449 uint64_t val, unsigned size)
1450 {
1451 VirtIOPCIProxy *proxy = opaque;
1452 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1453
1454 if (vdev == NULL) {
1455 return;
1456 }
1457
1458 switch (size) {
1459 case 1:
1460 virtio_config_modern_writeb(vdev, addr, val);
1461 break;
1462 case 2:
1463 virtio_config_modern_writew(vdev, addr, val);
1464 break;
1465 case 4:
1466 virtio_config_modern_writel(vdev, addr, val);
1467 break;
1468 }
1469 }
1470
1471 static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy,
1472 const char *vdev_name)
1473 {
1474 static const MemoryRegionOps common_ops = {
1475 .read = virtio_pci_common_read,
1476 .write = virtio_pci_common_write,
1477 .impl = {
1478 .min_access_size = 1,
1479 .max_access_size = 4,
1480 },
1481 .endianness = DEVICE_LITTLE_ENDIAN,
1482 };
1483 static const MemoryRegionOps isr_ops = {
1484 .read = virtio_pci_isr_read,
1485 .write = virtio_pci_isr_write,
1486 .impl = {
1487 .min_access_size = 1,
1488 .max_access_size = 4,
1489 },
1490 .endianness = DEVICE_LITTLE_ENDIAN,
1491 };
1492 static const MemoryRegionOps device_ops = {
1493 .read = virtio_pci_device_read,
1494 .write = virtio_pci_device_write,
1495 .impl = {
1496 .min_access_size = 1,
1497 .max_access_size = 4,
1498 },
1499 .endianness = DEVICE_LITTLE_ENDIAN,
1500 };
1501 static const MemoryRegionOps notify_ops = {
1502 .read = virtio_pci_notify_read,
1503 .write = virtio_pci_notify_write,
1504 .impl = {
1505 .min_access_size = 1,
1506 .max_access_size = 4,
1507 },
1508 .endianness = DEVICE_LITTLE_ENDIAN,
1509 };
1510 static const MemoryRegionOps notify_pio_ops = {
1511 .read = virtio_pci_notify_read,
1512 .write = virtio_pci_notify_write_pio,
1513 .impl = {
1514 .min_access_size = 1,
1515 .max_access_size = 4,
1516 },
1517 .endianness = DEVICE_LITTLE_ENDIAN,
1518 };
1519 g_autoptr(GString) name = g_string_new(NULL);
1520
1521 g_string_printf(name, "virtio-pci-common-%s", vdev_name);
1522 memory_region_init_io(&proxy->common.mr, OBJECT(proxy),
1523 &common_ops,
1524 proxy,
1525 name->str,
1526 proxy->common.size);
1527
1528 g_string_printf(name, "virtio-pci-isr-%s", vdev_name);
1529 memory_region_init_io(&proxy->isr.mr, OBJECT(proxy),
1530 &isr_ops,
1531 proxy,
1532 name->str,
1533 proxy->isr.size);
1534
1535 g_string_printf(name, "virtio-pci-device-%s", vdev_name);
1536 memory_region_init_io(&proxy->device.mr, OBJECT(proxy),
1537 &device_ops,
1538 proxy,
1539 name->str,
1540 proxy->device.size);
1541
1542 g_string_printf(name, "virtio-pci-notify-%s", vdev_name);
1543 memory_region_init_io(&proxy->notify.mr, OBJECT(proxy),
1544 &notify_ops,
1545 proxy,
1546 name->str,
1547 proxy->notify.size);
1548
1549 g_string_printf(name, "virtio-pci-notify-pio-%s", vdev_name);
1550 memory_region_init_io(&proxy->notify_pio.mr, OBJECT(proxy),
1551 &notify_pio_ops,
1552 proxy,
1553 name->str,
1554 proxy->notify_pio.size);
1555 }
1556
1557 static void virtio_pci_modern_region_map(VirtIOPCIProxy *proxy,
1558 VirtIOPCIRegion *region,
1559 struct virtio_pci_cap *cap,
1560 MemoryRegion *mr,
1561 uint8_t bar)
1562 {
1563 memory_region_add_subregion(mr, region->offset, &region->mr);
1564
1565 cap->cfg_type = region->type;
1566 cap->bar = bar;
1567 cap->offset = cpu_to_le32(region->offset);
1568 cap->length = cpu_to_le32(region->size);
1569 virtio_pci_add_mem_cap(proxy, cap);
1570
1571 }
1572
1573 static void virtio_pci_modern_mem_region_map(VirtIOPCIProxy *proxy,
1574 VirtIOPCIRegion *region,
1575 struct virtio_pci_cap *cap)
1576 {
1577 virtio_pci_modern_region_map(proxy, region, cap,
1578 &proxy->modern_bar, proxy->modern_mem_bar_idx);
1579 }
1580
1581 static void virtio_pci_modern_io_region_map(VirtIOPCIProxy *proxy,
1582 VirtIOPCIRegion *region,
1583 struct virtio_pci_cap *cap)
1584 {
1585 virtio_pci_modern_region_map(proxy, region, cap,
1586 &proxy->io_bar, proxy->modern_io_bar_idx);
1587 }
1588
1589 static void virtio_pci_modern_mem_region_unmap(VirtIOPCIProxy *proxy,
1590 VirtIOPCIRegion *region)
1591 {
1592 memory_region_del_subregion(&proxy->modern_bar,
1593 &region->mr);
1594 }
1595
1596 static void virtio_pci_modern_io_region_unmap(VirtIOPCIProxy *proxy,
1597 VirtIOPCIRegion *region)
1598 {
1599 memory_region_del_subregion(&proxy->io_bar,
1600 &region->mr);
1601 }
1602
1603 static void virtio_pci_pre_plugged(DeviceState *d, Error **errp)
1604 {
1605 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1606 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1607
1608 if (virtio_pci_modern(proxy)) {
1609 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1);
1610 }
1611
1612 virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE);
1613 }
1614
1615 /* This is called by virtio-bus just after the device is plugged. */
1616 static void virtio_pci_device_plugged(DeviceState *d, Error **errp)
1617 {
1618 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1619 VirtioBusState *bus = &proxy->bus;
1620 bool legacy = virtio_pci_legacy(proxy);
1621 bool modern;
1622 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
1623 uint8_t *config;
1624 uint32_t size;
1625 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
1626
1627 /*
1628 * Virtio capabilities present without
1629 * VIRTIO_F_VERSION_1 confuses guests
1630 */
1631 if (!proxy->ignore_backend_features &&
1632 !virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) {
1633 virtio_pci_disable_modern(proxy);
1634
1635 if (!legacy) {
1636 error_setg(errp, "Device doesn't support modern mode, and legacy"
1637 " mode is disabled");
1638 error_append_hint(errp, "Set disable-legacy to off\n");
1639
1640 return;
1641 }
1642 }
1643
1644 modern = virtio_pci_modern(proxy);
1645
1646 config = proxy->pci_dev.config;
1647 if (proxy->class_code) {
1648 pci_config_set_class(config, proxy->class_code);
1649 }
1650
1651 if (legacy) {
1652 if (!virtio_legacy_allowed(vdev)) {
1653 /*
1654 * To avoid migration issues, we allow legacy mode when legacy
1655 * check is disabled in the old machine types (< 5.1).
1656 */
1657 if (virtio_legacy_check_disabled(vdev)) {
1658 warn_report("device is modern-only, but for backward "
1659 "compatibility legacy is allowed");
1660 } else {
1661 error_setg(errp,
1662 "device is modern-only, use disable-legacy=on");
1663 return;
1664 }
1665 }
1666 if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
1667 error_setg(errp, "VIRTIO_F_IOMMU_PLATFORM was supported by"
1668 " neither legacy nor transitional device");
1669 return ;
1670 }
1671 /*
1672 * Legacy and transitional devices use specific subsystem IDs.
1673 * Note that the subsystem vendor ID (config + PCI_SUBSYSTEM_VENDOR_ID)
1674 * is set to PCI_SUBVENDOR_ID_REDHAT_QUMRANET by default.
1675 */
1676 pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus));
1677 } else {
1678 /* pure virtio-1.0 */
1679 pci_set_word(config + PCI_VENDOR_ID,
1680 PCI_VENDOR_ID_REDHAT_QUMRANET);
1681 pci_set_word(config + PCI_DEVICE_ID,
1682 0x1040 + virtio_bus_get_vdev_id(bus));
1683 pci_config_set_revision(config, 1);
1684 }
1685 config[PCI_INTERRUPT_PIN] = 1;
1686
1687
1688 if (modern) {
1689 struct virtio_pci_cap cap = {
1690 .cap_len = sizeof cap,
1691 };
1692 struct virtio_pci_notify_cap notify = {
1693 .cap.cap_len = sizeof notify,
1694 .notify_off_multiplier =
1695 cpu_to_le32(virtio_pci_queue_mem_mult(proxy)),
1696 };
1697 struct virtio_pci_cfg_cap cfg = {
1698 .cap.cap_len = sizeof cfg,
1699 .cap.cfg_type = VIRTIO_PCI_CAP_PCI_CFG,
1700 };
1701 struct virtio_pci_notify_cap notify_pio = {
1702 .cap.cap_len = sizeof notify,
1703 .notify_off_multiplier = cpu_to_le32(0x0),
1704 };
1705
1706 struct virtio_pci_cfg_cap *cfg_mask;
1707
1708 virtio_pci_modern_regions_init(proxy, vdev->name);
1709
1710 virtio_pci_modern_mem_region_map(proxy, &proxy->common, &cap);
1711 virtio_pci_modern_mem_region_map(proxy, &proxy->isr, &cap);
1712 virtio_pci_modern_mem_region_map(proxy, &proxy->device, &cap);
1713 virtio_pci_modern_mem_region_map(proxy, &proxy->notify, &notify.cap);
1714
1715 if (modern_pio) {
1716 memory_region_init(&proxy->io_bar, OBJECT(proxy),
1717 "virtio-pci-io", 0x4);
1718
1719 pci_register_bar(&proxy->pci_dev, proxy->modern_io_bar_idx,
1720 PCI_BASE_ADDRESS_SPACE_IO, &proxy->io_bar);
1721
1722 virtio_pci_modern_io_region_map(proxy, &proxy->notify_pio,
1723 &notify_pio.cap);
1724 }
1725
1726 pci_register_bar(&proxy->pci_dev, proxy->modern_mem_bar_idx,
1727 PCI_BASE_ADDRESS_SPACE_MEMORY |
1728 PCI_BASE_ADDRESS_MEM_PREFETCH |
1729 PCI_BASE_ADDRESS_MEM_TYPE_64,
1730 &proxy->modern_bar);
1731
1732 proxy->config_cap = virtio_pci_add_mem_cap(proxy, &cfg.cap);
1733 cfg_mask = (void *)(proxy->pci_dev.wmask + proxy->config_cap);
1734 pci_set_byte(&cfg_mask->cap.bar, ~0x0);
1735 pci_set_long((uint8_t *)&cfg_mask->cap.offset, ~0x0);
1736 pci_set_long((uint8_t *)&cfg_mask->cap.length, ~0x0);
1737 pci_set_long(cfg_mask->pci_cfg_data, ~0x0);
1738 }
1739
1740 if (proxy->nvectors) {
1741 int err = msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors,
1742 proxy->msix_bar_idx, NULL);
1743 if (err) {
1744 /* Notice when a system that supports MSIx can't initialize it */
1745 if (err != -ENOTSUP) {
1746 warn_report("unable to init msix vectors to %" PRIu32,
1747 proxy->nvectors);
1748 }
1749 proxy->nvectors = 0;
1750 }
1751 }
1752
1753 proxy->pci_dev.config_write = virtio_write_config;
1754 proxy->pci_dev.config_read = virtio_read_config;
1755
1756 if (legacy) {
1757 size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
1758 + virtio_bus_get_vdev_config_len(bus);
1759 size = pow2ceil(size);
1760
1761 memory_region_init_io(&proxy->bar, OBJECT(proxy),
1762 &virtio_pci_config_ops,
1763 proxy, "virtio-pci", size);
1764
1765 pci_register_bar(&proxy->pci_dev, proxy->legacy_io_bar_idx,
1766 PCI_BASE_ADDRESS_SPACE_IO, &proxy->bar);
1767 }
1768 }
1769
1770 static void virtio_pci_device_unplugged(DeviceState *d)
1771 {
1772 VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1773 bool modern = virtio_pci_modern(proxy);
1774 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY;
1775
1776 virtio_pci_stop_ioeventfd(proxy);
1777
1778 if (modern) {
1779 virtio_pci_modern_mem_region_unmap(proxy, &proxy->common);
1780 virtio_pci_modern_mem_region_unmap(proxy, &proxy->isr);
1781 virtio_pci_modern_mem_region_unmap(proxy, &proxy->device);
1782 virtio_pci_modern_mem_region_unmap(proxy, &proxy->notify);
1783 if (modern_pio) {
1784 virtio_pci_modern_io_region_unmap(proxy, &proxy->notify_pio);
1785 }
1786 }
1787 }
1788
1789 static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
1790 {
1791 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
1792 VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
1793 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) &&
1794 !pci_bus_is_root(pci_get_bus(pci_dev));
1795
1796 if (kvm_enabled() && !kvm_has_many_ioeventfds()) {
1797 proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
1798 }
1799
1800 /* fd-based ioevents can't be synchronized in record/replay */
1801 if (replay_mode != REPLAY_MODE_NONE) {
1802 proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
1803 }
1804
1805 /*
1806 * virtio pci bar layout used by default.
1807 * subclasses can re-arrange things if needed.
1808 *
1809 * region 0 -- virtio legacy io bar
1810 * region 1 -- msi-x bar
1811 * region 2 -- virtio modern io bar (off by default)
1812 * region 4+5 -- virtio modern memory (64bit) bar
1813 *
1814 */
1815 proxy->legacy_io_bar_idx = 0;
1816 proxy->msix_bar_idx = 1;
1817 proxy->modern_io_bar_idx = 2;
1818 proxy->modern_mem_bar_idx = 4;
1819
1820 proxy->common.offset = 0x0;
1821 proxy->common.size = 0x1000;
1822 proxy->common.type = VIRTIO_PCI_CAP_COMMON_CFG;
1823
1824 proxy->isr.offset = 0x1000;
1825 proxy->isr.size = 0x1000;
1826 proxy->isr.type = VIRTIO_PCI_CAP_ISR_CFG;
1827
1828 proxy->device.offset = 0x2000;
1829 proxy->device.size = 0x1000;
1830 proxy->device.type = VIRTIO_PCI_CAP_DEVICE_CFG;
1831
1832 proxy->notify.offset = 0x3000;
1833 proxy->notify.size = virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX;
1834 proxy->notify.type = VIRTIO_PCI_CAP_NOTIFY_CFG;
1835
1836 proxy->notify_pio.offset = 0x0;
1837 proxy->notify_pio.size = 0x4;
1838 proxy->notify_pio.type = VIRTIO_PCI_CAP_NOTIFY_CFG;
1839
1840 /* subclasses can enforce modern, so do this unconditionally */
1841 memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci",
1842 /* PCI BAR regions must be powers of 2 */
1843 pow2ceil(proxy->notify.offset + proxy->notify.size));
1844
1845 if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) {
1846 proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
1847 }
1848
1849 if (!virtio_pci_modern(proxy) && !virtio_pci_legacy(proxy)) {
1850 error_setg(errp, "device cannot work as neither modern nor legacy mode"
1851 " is enabled");
1852 error_append_hint(errp, "Set either disable-modern or disable-legacy"
1853 " to off\n");
1854 return;
1855 }
1856
1857 if (pcie_port && pci_is_express(pci_dev)) {
1858 int pos;
1859 uint16_t last_pcie_cap_offset = PCI_CONFIG_SPACE_SIZE;
1860
1861 pos = pcie_endpoint_cap_init(pci_dev, 0);
1862 assert(pos > 0);
1863
1864 pos = pci_add_capability(pci_dev, PCI_CAP_ID_PM, 0,
1865 PCI_PM_SIZEOF, errp);
1866 if (pos < 0) {
1867 return;
1868 }
1869
1870 pci_dev->exp.pm_cap = pos;
1871
1872 /*
1873 * Indicates that this function complies with revision 1.2 of the
1874 * PCI Power Management Interface Specification.
1875 */
1876 pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3);
1877
1878 if (proxy->flags & VIRTIO_PCI_FLAG_AER) {
1879 pcie_aer_init(pci_dev, PCI_ERR_VER, last_pcie_cap_offset,
1880 PCI_ERR_SIZEOF, NULL);
1881 last_pcie_cap_offset += PCI_ERR_SIZEOF;
1882 }
1883
1884 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_DEVERR) {
1885 /* Init error enabling flags */
1886 pcie_cap_deverr_init(pci_dev);
1887 }
1888
1889 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_LNKCTL) {
1890 /* Init Link Control Register */
1891 pcie_cap_lnkctl_init(pci_dev);
1892 }
1893
1894 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_PM) {
1895 /* Init Power Management Control Register */
1896 pci_set_word(pci_dev->wmask + pos + PCI_PM_CTRL,
1897 PCI_PM_CTRL_STATE_MASK);
1898 }
1899
1900 if (proxy->flags & VIRTIO_PCI_FLAG_ATS) {
1901 pcie_ats_init(pci_dev, last_pcie_cap_offset,
1902 proxy->flags & VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED);
1903 last_pcie_cap_offset += PCI_EXT_CAP_ATS_SIZEOF;
1904 }
1905
1906 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) {
1907 /* Set Function Level Reset capability bit */
1908 pcie_cap_flr_init(pci_dev);
1909 }
1910 } else {
1911 /*
1912 * make future invocations of pci_is_express() return false
1913 * and pci_config_size() return PCI_CONFIG_SPACE_SIZE.
1914 */
1915 pci_dev->cap_present &= ~QEMU_PCI_CAP_EXPRESS;
1916 }
1917
1918 virtio_pci_bus_new(&proxy->bus, sizeof(proxy->bus), proxy);
1919 if (k->realize) {
1920 k->realize(proxy, errp);
1921 }
1922 }
1923
1924 static void virtio_pci_exit(PCIDevice *pci_dev)
1925 {
1926 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
1927 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) &&
1928 !pci_bus_is_root(pci_get_bus(pci_dev));
1929
1930 msix_uninit_exclusive_bar(pci_dev);
1931 if (proxy->flags & VIRTIO_PCI_FLAG_AER && pcie_port &&
1932 pci_is_express(pci_dev)) {
1933 pcie_aer_exit(pci_dev);
1934 }
1935 }
1936
1937 static void virtio_pci_reset(DeviceState *qdev)
1938 {
1939 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
1940 VirtioBusState *bus = VIRTIO_BUS(&proxy->bus);
1941 PCIDevice *dev = PCI_DEVICE(qdev);
1942 int i;
1943
1944 virtio_pci_stop_ioeventfd(proxy);
1945 virtio_bus_reset(bus);
1946 msix_unuse_all_vectors(&proxy->pci_dev);
1947
1948 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
1949 proxy->vqs[i].enabled = 0;
1950 proxy->vqs[i].num = 0;
1951 proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0;
1952 proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0;
1953 proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0;
1954 }
1955
1956 if (pci_is_express(dev)) {
1957 pcie_cap_deverr_reset(dev);
1958 pcie_cap_lnkctl_reset(dev);
1959
1960 pci_set_word(dev->config + dev->exp.pm_cap + PCI_PM_CTRL, 0);
1961 }
1962 }
1963
1964 static Property virtio_pci_properties[] = {
1965 DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags,
1966 VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false),
1967 DEFINE_PROP_BIT("migrate-extra", VirtIOPCIProxy, flags,
1968 VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT, true),
1969 DEFINE_PROP_BIT("modern-pio-notify", VirtIOPCIProxy, flags,
1970 VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT, false),
1971 DEFINE_PROP_BIT("x-disable-pcie", VirtIOPCIProxy, flags,
1972 VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT, false),
1973 DEFINE_PROP_BIT("page-per-vq", VirtIOPCIProxy, flags,
1974 VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT, false),
1975 DEFINE_PROP_BOOL("x-ignore-backend-features", VirtIOPCIProxy,
1976 ignore_backend_features, false),
1977 DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags,
1978 VIRTIO_PCI_FLAG_ATS_BIT, false),
1979 DEFINE_PROP_BIT("x-ats-page-aligned", VirtIOPCIProxy, flags,
1980 VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, true),
1981 DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags,
1982 VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true),
1983 DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags,
1984 VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true),
1985 DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags,
1986 VIRTIO_PCI_FLAG_INIT_PM_BIT, true),
1987 DEFINE_PROP_BIT("x-pcie-flr-init", VirtIOPCIProxy, flags,
1988 VIRTIO_PCI_FLAG_INIT_FLR_BIT, true),
1989 DEFINE_PROP_BIT("aer", VirtIOPCIProxy, flags,
1990 VIRTIO_PCI_FLAG_AER_BIT, false),
1991 DEFINE_PROP_END_OF_LIST(),
1992 };
1993
1994 static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp)
1995 {
1996 VirtioPCIClass *vpciklass = VIRTIO_PCI_GET_CLASS(qdev);
1997 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
1998 PCIDevice *pci_dev = &proxy->pci_dev;
1999
2000 if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) &&
2001 virtio_pci_modern(proxy)) {
2002 pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
2003 }
2004
2005 vpciklass->parent_dc_realize(qdev, errp);
2006 }
2007
2008 static void virtio_pci_class_init(ObjectClass *klass, void *data)
2009 {
2010 DeviceClass *dc = DEVICE_CLASS(klass);
2011 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
2012 VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass);
2013
2014 device_class_set_props(dc, virtio_pci_properties);
2015 k->realize = virtio_pci_realize;
2016 k->exit = virtio_pci_exit;
2017 k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
2018 k->revision = VIRTIO_PCI_ABI_VERSION;
2019 k->class_id = PCI_CLASS_OTHERS;
2020 device_class_set_parent_realize(dc, virtio_pci_dc_realize,
2021 &vpciklass->parent_dc_realize);
2022 dc->reset = virtio_pci_reset;
2023 }
2024
2025 static const TypeInfo virtio_pci_info = {
2026 .name = TYPE_VIRTIO_PCI,
2027 .parent = TYPE_PCI_DEVICE,
2028 .instance_size = sizeof(VirtIOPCIProxy),
2029 .class_init = virtio_pci_class_init,
2030 .class_size = sizeof(VirtioPCIClass),
2031 .abstract = true,
2032 };
2033
2034 static Property virtio_pci_generic_properties[] = {
2035 DEFINE_PROP_ON_OFF_AUTO("disable-legacy", VirtIOPCIProxy, disable_legacy,
2036 ON_OFF_AUTO_AUTO),
2037 DEFINE_PROP_BOOL("disable-modern", VirtIOPCIProxy, disable_modern, false),
2038 DEFINE_PROP_END_OF_LIST(),
2039 };
2040
2041 static void virtio_pci_base_class_init(ObjectClass *klass, void *data)
2042 {
2043 const VirtioPCIDeviceTypeInfo *t = data;
2044 if (t->class_init) {
2045 t->class_init(klass, NULL);
2046 }
2047 }
2048
2049 static void virtio_pci_generic_class_init(ObjectClass *klass, void *data)
2050 {
2051 DeviceClass *dc = DEVICE_CLASS(klass);
2052
2053 device_class_set_props(dc, virtio_pci_generic_properties);
2054 }
2055
2056 static void virtio_pci_transitional_instance_init(Object *obj)
2057 {
2058 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj);
2059
2060 proxy->disable_legacy = ON_OFF_AUTO_OFF;
2061 proxy->disable_modern = false;
2062 }
2063
2064 static void virtio_pci_non_transitional_instance_init(Object *obj)
2065 {
2066 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj);
2067
2068 proxy->disable_legacy = ON_OFF_AUTO_ON;
2069 proxy->disable_modern = false;
2070 }
2071
2072 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t)
2073 {
2074 char *base_name = NULL;
2075 TypeInfo base_type_info = {
2076 .name = t->base_name,
2077 .parent = t->parent ? t->parent : TYPE_VIRTIO_PCI,
2078 .instance_size = t->instance_size,
2079 .instance_init = t->instance_init,
2080 .class_size = t->class_size,
2081 .abstract = true,
2082 .interfaces = t->interfaces,
2083 };
2084 TypeInfo generic_type_info = {
2085 .name = t->generic_name,
2086 .parent = base_type_info.name,
2087 .class_init = virtio_pci_generic_class_init,
2088 .interfaces = (InterfaceInfo[]) {
2089 { INTERFACE_PCIE_DEVICE },
2090 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
2091 { }
2092 },
2093 };
2094
2095 if (!base_type_info.name) {
2096 /* No base type -> register a single generic device type */
2097 /* use intermediate %s-base-type to add generic device props */
2098 base_name = g_strdup_printf("%s-base-type", t->generic_name);
2099 base_type_info.name = base_name;
2100 base_type_info.class_init = virtio_pci_generic_class_init;
2101
2102 generic_type_info.parent = base_name;
2103 generic_type_info.class_init = virtio_pci_base_class_init;
2104 generic_type_info.class_data = (void *)t;
2105
2106 assert(!t->non_transitional_name);
2107 assert(!t->transitional_name);
2108 } else {
2109 base_type_info.class_init = virtio_pci_base_class_init;
2110 base_type_info.class_data = (void *)t;
2111 }
2112
2113 type_register(&base_type_info);
2114 if (generic_type_info.name) {
2115 type_register(&generic_type_info);
2116 }
2117
2118 if (t->non_transitional_name) {
2119 const TypeInfo non_transitional_type_info = {
2120 .name = t->non_transitional_name,
2121 .parent = base_type_info.name,
2122 .instance_init = virtio_pci_non_transitional_instance_init,
2123 .interfaces = (InterfaceInfo[]) {
2124 { INTERFACE_PCIE_DEVICE },
2125 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
2126 { }
2127 },
2128 };
2129 type_register(&non_transitional_type_info);
2130 }
2131
2132 if (t->transitional_name) {
2133 const TypeInfo transitional_type_info = {
2134 .name = t->transitional_name,
2135 .parent = base_type_info.name,
2136 .instance_init = virtio_pci_transitional_instance_init,
2137 .interfaces = (InterfaceInfo[]) {
2138 /*
2139 * Transitional virtio devices work only as Conventional PCI
2140 * devices because they require PIO ports.
2141 */
2142 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
2143 { }
2144 },
2145 };
2146 type_register(&transitional_type_info);
2147 }
2148 g_free(base_name);
2149 }
2150
2151 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues)
2152 {
2153 /*
2154 * 1:1 vq to vCPU mapping is ideal because the same vCPU that submitted
2155 * virtqueue buffers can handle their completion. When a different vCPU
2156 * handles completion it may need to IPI the vCPU that submitted the
2157 * request and this adds overhead.
2158 *
2159 * Virtqueues consume guest RAM and MSI-X vectors. This is wasteful in
2160 * guests with very many vCPUs and a device that is only used by a few
2161 * vCPUs. Unfortunately optimizing that case requires manual pinning inside
2162 * the guest, so those users might as well manually set the number of
2163 * queues. There is no upper limit that can be applied automatically and
2164 * doing so arbitrarily would result in a sudden performance drop once the
2165 * threshold number of vCPUs is exceeded.
2166 */
2167 unsigned num_queues = current_machine->smp.cpus;
2168
2169 /*
2170 * The maximum number of MSI-X vectors is PCI_MSIX_FLAGS_QSIZE + 1, but the
2171 * config change interrupt and the fixed virtqueues must be taken into
2172 * account too.
2173 */
2174 num_queues = MIN(num_queues, PCI_MSIX_FLAGS_QSIZE - fixed_queues);
2175
2176 /*
2177 * There is a limit to how many virtqueues a device can have.
2178 */
2179 return MIN(num_queues, VIRTIO_QUEUE_MAX - fixed_queues);
2180 }
2181
2182 /* virtio-pci-bus */
2183
2184 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
2185 VirtIOPCIProxy *dev)
2186 {
2187 DeviceState *qdev = DEVICE(dev);
2188 char virtio_bus_name[] = "virtio-bus";
2189
2190 qbus_init(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev, virtio_bus_name);
2191 }
2192
2193 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
2194 {
2195 BusClass *bus_class = BUS_CLASS(klass);
2196 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
2197 bus_class->max_dev = 1;
2198 k->notify = virtio_pci_notify;
2199 k->save_config = virtio_pci_save_config;
2200 k->load_config = virtio_pci_load_config;
2201 k->save_queue = virtio_pci_save_queue;
2202 k->load_queue = virtio_pci_load_queue;
2203 k->save_extra_state = virtio_pci_save_extra_state;
2204 k->load_extra_state = virtio_pci_load_extra_state;
2205 k->has_extra_state = virtio_pci_has_extra_state;
2206 k->query_guest_notifiers = virtio_pci_query_guest_notifiers;
2207 k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
2208 k->set_host_notifier_mr = virtio_pci_set_host_notifier_mr;
2209 k->vmstate_change = virtio_pci_vmstate_change;
2210 k->pre_plugged = virtio_pci_pre_plugged;
2211 k->device_plugged = virtio_pci_device_plugged;
2212 k->device_unplugged = virtio_pci_device_unplugged;
2213 k->query_nvectors = virtio_pci_query_nvectors;
2214 k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled;
2215 k->ioeventfd_assign = virtio_pci_ioeventfd_assign;
2216 k->get_dma_as = virtio_pci_get_dma_as;
2217 k->iommu_enabled = virtio_pci_iommu_enabled;
2218 k->queue_enabled = virtio_pci_queue_enabled;
2219 }
2220
2221 static const TypeInfo virtio_pci_bus_info = {
2222 .name = TYPE_VIRTIO_PCI_BUS,
2223 .parent = TYPE_VIRTIO_BUS,
2224 .instance_size = sizeof(VirtioPCIBusState),
2225 .class_size = sizeof(VirtioPCIBusClass),
2226 .class_init = virtio_pci_bus_class_init,
2227 };
2228
2229 static void virtio_pci_register_types(void)
2230 {
2231 /* Base types: */
2232 type_register_static(&virtio_pci_bus_info);
2233 type_register_static(&virtio_pci_info);
2234 }
2235
2236 type_init(virtio_pci_register_types)
2237
QEmu