root / hw / virtio.c @ 97b83deb
History | View | Annotate | Download (22.9 kB)
1 |
/*
|
---|---|
2 |
* Virtio Support
|
3 |
*
|
4 |
* Copyright IBM, Corp. 2007
|
5 |
*
|
6 |
* Authors:
|
7 |
* Anthony Liguori <aliguori@us.ibm.com>
|
8 |
*
|
9 |
* This work is licensed under the terms of the GNU GPL, version 2. See
|
10 |
* the COPYING file in the top-level directory.
|
11 |
*
|
12 |
*/
|
13 |
|
14 |
#include <inttypes.h> |
15 |
|
16 |
#include "virtio.h" |
17 |
#include "sysemu.h" |
18 |
|
19 |
//#define VIRTIO_ZERO_COPY
|
20 |
|
21 |
/* from Linux's linux/virtio_pci.h */
|
22 |
|
23 |
/* A 32-bit r/o bitmask of the features supported by the host */
|
24 |
#define VIRTIO_PCI_HOST_FEATURES 0 |
25 |
|
26 |
/* A 32-bit r/w bitmask of features activated by the guest */
|
27 |
#define VIRTIO_PCI_GUEST_FEATURES 4 |
28 |
|
29 |
/* A 32-bit r/w PFN for the currently selected queue */
|
30 |
#define VIRTIO_PCI_QUEUE_PFN 8 |
31 |
|
32 |
/* A 16-bit r/o queue size for the currently selected queue */
|
33 |
#define VIRTIO_PCI_QUEUE_NUM 12 |
34 |
|
35 |
/* A 16-bit r/w queue selector */
|
36 |
#define VIRTIO_PCI_QUEUE_SEL 14 |
37 |
|
38 |
/* A 16-bit r/w queue notifier */
|
39 |
#define VIRTIO_PCI_QUEUE_NOTIFY 16 |
40 |
|
41 |
/* An 8-bit device status register. */
|
42 |
#define VIRTIO_PCI_STATUS 18 |
43 |
|
44 |
/* An 8-bit r/o interrupt status register. Reading the value will return the
|
45 |
* current contents of the ISR and will also clear it. This is effectively
|
46 |
* a read-and-acknowledge. */
|
47 |
#define VIRTIO_PCI_ISR 19 |
48 |
|
49 |
#define VIRTIO_PCI_CONFIG 20 |
50 |
|
51 |
/* Virtio ABI version, if we increment this, we break the guest driver. */
|
52 |
#define VIRTIO_PCI_ABI_VERSION 0 |
53 |
|
54 |
/* How many bits to shift physical queue address written to QUEUE_PFN.
|
55 |
* 12 is historical, and due to x86 page size. */
|
56 |
#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12 |
57 |
|
58 |
/* The alignment to use between consumer and producer parts of vring.
|
59 |
* x86 pagesize again. */
|
60 |
#define VIRTIO_PCI_VRING_ALIGN 4096 |
61 |
|
62 |
/* QEMU doesn't strictly need write barriers since everything runs in
|
63 |
* lock-step. We'll leave the calls to wmb() in though to make it obvious for
|
64 |
* KVM or if kqemu gets SMP support.
|
65 |
*/
|
66 |
#define wmb() do { } while (0) |
67 |
|
68 |
typedef struct VRingDesc |
69 |
{ |
70 |
uint64_t addr; |
71 |
uint32_t len; |
72 |
uint16_t flags; |
73 |
uint16_t next; |
74 |
} VRingDesc; |
75 |
|
76 |
typedef struct VRingAvail |
77 |
{ |
78 |
uint16_t flags; |
79 |
uint16_t idx; |
80 |
uint16_t ring[0];
|
81 |
} VRingAvail; |
82 |
|
83 |
typedef struct VRingUsedElem |
84 |
{ |
85 |
uint32_t id; |
86 |
uint32_t len; |
87 |
} VRingUsedElem; |
88 |
|
89 |
typedef struct VRingUsed |
90 |
{ |
91 |
uint16_t flags; |
92 |
uint16_t idx; |
93 |
VRingUsedElem ring[0];
|
94 |
} VRingUsed; |
95 |
|
96 |
typedef struct VRing |
97 |
{ |
98 |
unsigned int num; |
99 |
target_phys_addr_t desc; |
100 |
target_phys_addr_t avail; |
101 |
target_phys_addr_t used; |
102 |
} VRing; |
103 |
|
104 |
struct VirtQueue
|
105 |
{ |
106 |
VRing vring; |
107 |
uint32_t pfn; |
108 |
uint16_t last_avail_idx; |
109 |
int inuse;
|
110 |
void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
|
111 |
}; |
112 |
|
113 |
#define VIRTIO_PCI_QUEUE_MAX 16 |
114 |
|
115 |
/* virt queue functions */
|
116 |
#ifdef VIRTIO_ZERO_COPY
|
117 |
static void *virtio_map_gpa(target_phys_addr_t addr, size_t size) |
118 |
{ |
119 |
ram_addr_t off; |
120 |
target_phys_addr_t addr1; |
121 |
|
122 |
off = cpu_get_physical_page_desc(addr); |
123 |
if ((off & ~TARGET_PAGE_MASK) != IO_MEM_RAM) {
|
124 |
fprintf(stderr, "virtio DMA to IO ram\n");
|
125 |
exit(1);
|
126 |
} |
127 |
|
128 |
off = (off & TARGET_PAGE_MASK) | (addr & ~TARGET_PAGE_MASK); |
129 |
|
130 |
for (addr1 = addr + TARGET_PAGE_SIZE;
|
131 |
addr1 < TARGET_PAGE_ALIGN(addr + size); |
132 |
addr1 += TARGET_PAGE_SIZE) { |
133 |
ram_addr_t off1; |
134 |
|
135 |
off1 = cpu_get_physical_page_desc(addr1); |
136 |
if ((off1 & ~TARGET_PAGE_MASK) != IO_MEM_RAM) {
|
137 |
fprintf(stderr, "virtio DMA to IO ram\n");
|
138 |
exit(1);
|
139 |
} |
140 |
|
141 |
off1 = (off1 & TARGET_PAGE_MASK) | (addr1 & ~TARGET_PAGE_MASK); |
142 |
|
143 |
if (off1 != (off + (addr1 - addr))) {
|
144 |
fprintf(stderr, "discontigous virtio memory\n");
|
145 |
exit(1);
|
146 |
} |
147 |
} |
148 |
|
149 |
return phys_ram_base + off;
|
150 |
} |
151 |
#endif
|
152 |
|
153 |
static void virtqueue_init(VirtQueue *vq, target_phys_addr_t pa) |
154 |
{ |
155 |
vq->vring.desc = pa; |
156 |
vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
|
157 |
vq->vring.used = vring_align(vq->vring.avail + |
158 |
offsetof(VRingAvail, ring[vq->vring.num]), |
159 |
VIRTIO_PCI_VRING_ALIGN); |
160 |
} |
161 |
|
162 |
static inline uint64_t vring_desc_addr(VirtQueue *vq, int i) |
163 |
{ |
164 |
target_phys_addr_t pa; |
165 |
pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
|
166 |
return ldq_phys(pa);
|
167 |
} |
168 |
|
169 |
static inline uint32_t vring_desc_len(VirtQueue *vq, int i) |
170 |
{ |
171 |
target_phys_addr_t pa; |
172 |
pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
|
173 |
return ldl_phys(pa);
|
174 |
} |
175 |
|
176 |
static inline uint16_t vring_desc_flags(VirtQueue *vq, int i) |
177 |
{ |
178 |
target_phys_addr_t pa; |
179 |
pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
|
180 |
return lduw_phys(pa);
|
181 |
} |
182 |
|
183 |
static inline uint16_t vring_desc_next(VirtQueue *vq, int i) |
184 |
{ |
185 |
target_phys_addr_t pa; |
186 |
pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
|
187 |
return lduw_phys(pa);
|
188 |
} |
189 |
|
190 |
static inline uint16_t vring_avail_flags(VirtQueue *vq) |
191 |
{ |
192 |
target_phys_addr_t pa; |
193 |
pa = vq->vring.avail + offsetof(VRingAvail, flags); |
194 |
return lduw_phys(pa);
|
195 |
} |
196 |
|
197 |
static inline uint16_t vring_avail_idx(VirtQueue *vq) |
198 |
{ |
199 |
target_phys_addr_t pa; |
200 |
pa = vq->vring.avail + offsetof(VRingAvail, idx); |
201 |
return lduw_phys(pa);
|
202 |
} |
203 |
|
204 |
static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
205 |
{ |
206 |
target_phys_addr_t pa; |
207 |
pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
208 |
return lduw_phys(pa);
|
209 |
} |
210 |
|
211 |
static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
212 |
{ |
213 |
target_phys_addr_t pa; |
214 |
pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
215 |
stl_phys(pa, val); |
216 |
} |
217 |
|
218 |
static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) |
219 |
{ |
220 |
target_phys_addr_t pa; |
221 |
pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); |
222 |
stl_phys(pa, val); |
223 |
} |
224 |
|
225 |
static uint16_t vring_used_idx(VirtQueue *vq)
|
226 |
{ |
227 |
target_phys_addr_t pa; |
228 |
pa = vq->vring.used + offsetof(VRingUsed, idx); |
229 |
return lduw_phys(pa);
|
230 |
} |
231 |
|
232 |
static inline void vring_used_idx_increment(VirtQueue *vq, uint16_t val) |
233 |
{ |
234 |
target_phys_addr_t pa; |
235 |
pa = vq->vring.used + offsetof(VRingUsed, idx); |
236 |
stw_phys(pa, vring_used_idx(vq) + val); |
237 |
} |
238 |
|
239 |
static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
240 |
{ |
241 |
target_phys_addr_t pa; |
242 |
pa = vq->vring.used + offsetof(VRingUsed, flags); |
243 |
stw_phys(pa, lduw_phys(pa) | mask); |
244 |
} |
245 |
|
246 |
static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
247 |
{ |
248 |
target_phys_addr_t pa; |
249 |
pa = vq->vring.used + offsetof(VRingUsed, flags); |
250 |
stw_phys(pa, lduw_phys(pa) & ~mask); |
251 |
} |
252 |
|
253 |
void virtio_queue_set_notification(VirtQueue *vq, int enable) |
254 |
{ |
255 |
if (enable)
|
256 |
vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
257 |
else
|
258 |
vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
259 |
} |
260 |
|
261 |
int virtio_queue_ready(VirtQueue *vq)
|
262 |
{ |
263 |
return vq->vring.avail != 0; |
264 |
} |
265 |
|
266 |
int virtio_queue_empty(VirtQueue *vq)
|
267 |
{ |
268 |
return vring_avail_idx(vq) == vq->last_avail_idx;
|
269 |
} |
270 |
|
271 |
void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
272 |
unsigned int len, unsigned int idx) |
273 |
{ |
274 |
unsigned int offset; |
275 |
int i;
|
276 |
|
277 |
#ifndef VIRTIO_ZERO_COPY
|
278 |
for (i = 0; i < elem->out_num; i++) |
279 |
qemu_free(elem->out_sg[i].iov_base); |
280 |
#endif
|
281 |
|
282 |
offset = 0;
|
283 |
for (i = 0; i < elem->in_num; i++) { |
284 |
size_t size = MIN(len - offset, elem->in_sg[i].iov_len); |
285 |
|
286 |
#ifdef VIRTIO_ZERO_COPY
|
287 |
if (size) {
|
288 |
ram_addr_t addr = (uint8_t *)elem->in_sg[i].iov_base - phys_ram_base; |
289 |
ram_addr_t off; |
290 |
|
291 |
for (off = 0; off < size; off += TARGET_PAGE_SIZE) |
292 |
cpu_physical_memory_set_dirty(addr + off); |
293 |
} |
294 |
#else
|
295 |
if (size)
|
296 |
cpu_physical_memory_write(elem->in_addr[i], |
297 |
elem->in_sg[i].iov_base, |
298 |
size); |
299 |
|
300 |
qemu_free(elem->in_sg[i].iov_base); |
301 |
#endif
|
302 |
|
303 |
offset += size; |
304 |
} |
305 |
|
306 |
idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
307 |
|
308 |
/* Get a pointer to the next entry in the used ring. */
|
309 |
vring_used_ring_id(vq, idx, elem->index); |
310 |
vring_used_ring_len(vq, idx, len); |
311 |
} |
312 |
|
313 |
void virtqueue_flush(VirtQueue *vq, unsigned int count) |
314 |
{ |
315 |
/* Make sure buffer is written before we update index. */
|
316 |
wmb(); |
317 |
vring_used_idx_increment(vq, count); |
318 |
vq->inuse -= count; |
319 |
} |
320 |
|
321 |
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
322 |
unsigned int len) |
323 |
{ |
324 |
virtqueue_fill(vq, elem, len, 0);
|
325 |
virtqueue_flush(vq, 1);
|
326 |
} |
327 |
|
328 |
static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
329 |
{ |
330 |
uint16_t num_heads = vring_avail_idx(vq) - idx; |
331 |
|
332 |
/* Check it isn't doing very strange things with descriptor numbers. */
|
333 |
if (num_heads > vq->vring.num) {
|
334 |
fprintf(stderr, "Guest moved used index from %u to %u",
|
335 |
idx, vring_avail_idx(vq)); |
336 |
exit(1);
|
337 |
} |
338 |
|
339 |
return num_heads;
|
340 |
} |
341 |
|
342 |
static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) |
343 |
{ |
344 |
unsigned int head; |
345 |
|
346 |
/* Grab the next descriptor number they're advertising, and increment
|
347 |
* the index we've seen. */
|
348 |
head = vring_avail_ring(vq, idx % vq->vring.num); |
349 |
|
350 |
/* If their number is silly, that's a fatal mistake. */
|
351 |
if (head >= vq->vring.num) {
|
352 |
fprintf(stderr, "Guest says index %u is available", head);
|
353 |
exit(1);
|
354 |
} |
355 |
|
356 |
return head;
|
357 |
} |
358 |
|
359 |
static unsigned virtqueue_next_desc(VirtQueue *vq, unsigned int i) |
360 |
{ |
361 |
unsigned int next; |
362 |
|
363 |
/* If this descriptor says it doesn't chain, we're done. */
|
364 |
if (!(vring_desc_flags(vq, i) & VRING_DESC_F_NEXT))
|
365 |
return vq->vring.num;
|
366 |
|
367 |
/* Check they're not leading us off end of descriptors. */
|
368 |
next = vring_desc_next(vq, i); |
369 |
/* Make sure compiler knows to grab that: we don't want it changing! */
|
370 |
wmb(); |
371 |
|
372 |
if (next >= vq->vring.num) {
|
373 |
fprintf(stderr, "Desc next is %u", next);
|
374 |
exit(1);
|
375 |
} |
376 |
|
377 |
return next;
|
378 |
} |
379 |
|
380 |
int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes) |
381 |
{ |
382 |
unsigned int idx; |
383 |
int num_bufs, in_total, out_total;
|
384 |
|
385 |
idx = vq->last_avail_idx; |
386 |
|
387 |
num_bufs = in_total = out_total = 0;
|
388 |
while (virtqueue_num_heads(vq, idx)) {
|
389 |
int i;
|
390 |
|
391 |
i = virtqueue_get_head(vq, idx++); |
392 |
do {
|
393 |
/* If we've got too many, that implies a descriptor loop. */
|
394 |
if (++num_bufs > vq->vring.num) {
|
395 |
fprintf(stderr, "Looped descriptor");
|
396 |
exit(1);
|
397 |
} |
398 |
|
399 |
if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
|
400 |
if (in_bytes > 0 && |
401 |
(in_total += vring_desc_len(vq, i)) >= in_bytes) |
402 |
return 1; |
403 |
} else {
|
404 |
if (out_bytes > 0 && |
405 |
(out_total += vring_desc_len(vq, i)) >= out_bytes) |
406 |
return 1; |
407 |
} |
408 |
} while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
|
409 |
} |
410 |
|
411 |
return 0; |
412 |
} |
413 |
|
414 |
int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
|
415 |
{ |
416 |
unsigned int i, head; |
417 |
|
418 |
if (!virtqueue_num_heads(vq, vq->last_avail_idx))
|
419 |
return 0; |
420 |
|
421 |
/* When we start there are none of either input nor output. */
|
422 |
elem->out_num = elem->in_num = 0;
|
423 |
|
424 |
i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
425 |
do {
|
426 |
struct iovec *sg;
|
427 |
|
428 |
if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
|
429 |
elem->in_addr[elem->in_num] = vring_desc_addr(vq, i); |
430 |
sg = &elem->in_sg[elem->in_num++]; |
431 |
} else
|
432 |
sg = &elem->out_sg[elem->out_num++]; |
433 |
|
434 |
/* Grab the first descriptor, and check it's OK. */
|
435 |
sg->iov_len = vring_desc_len(vq, i); |
436 |
|
437 |
#ifdef VIRTIO_ZERO_COPY
|
438 |
sg->iov_base = virtio_map_gpa(vring_desc_addr(vq, i), sg->iov_len); |
439 |
#else
|
440 |
/* cap individual scatter element size to prevent unbounded allocations
|
441 |
of memory from the guest. Practically speaking, no virtio driver
|
442 |
will ever pass more than a page in each element. We set the cap to
|
443 |
be 2MB in case for some reason a large page makes it way into the
|
444 |
sg list. When we implement a zero copy API, this limitation will
|
445 |
disappear */
|
446 |
if (sg->iov_len > (2 << 20)) |
447 |
sg->iov_len = 2 << 20; |
448 |
|
449 |
sg->iov_base = qemu_malloc(sg->iov_len); |
450 |
if (!(vring_desc_flags(vq, i) & VRING_DESC_F_WRITE)) {
|
451 |
cpu_physical_memory_read(vring_desc_addr(vq, i), |
452 |
sg->iov_base, |
453 |
sg->iov_len); |
454 |
} |
455 |
#endif
|
456 |
if (sg->iov_base == NULL) { |
457 |
fprintf(stderr, "Invalid mapping\n");
|
458 |
exit(1);
|
459 |
} |
460 |
|
461 |
/* If we've got too many, that implies a descriptor loop. */
|
462 |
if ((elem->in_num + elem->out_num) > vq->vring.num) {
|
463 |
fprintf(stderr, "Looped descriptor");
|
464 |
exit(1);
|
465 |
} |
466 |
} while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
|
467 |
|
468 |
elem->index = head; |
469 |
|
470 |
vq->inuse++; |
471 |
|
472 |
return elem->in_num + elem->out_num;
|
473 |
} |
474 |
|
475 |
/* virtio device */
|
476 |
|
477 |
static VirtIODevice *to_virtio_device(PCIDevice *pci_dev)
|
478 |
{ |
479 |
return (VirtIODevice *)pci_dev;
|
480 |
} |
481 |
|
482 |
static void virtio_update_irq(VirtIODevice *vdev) |
483 |
{ |
484 |
qemu_set_irq(vdev->pci_dev.irq[0], vdev->isr & 1); |
485 |
} |
486 |
|
487 |
static void virtio_reset(void *opaque) |
488 |
{ |
489 |
VirtIODevice *vdev = opaque; |
490 |
int i;
|
491 |
|
492 |
if (vdev->reset)
|
493 |
vdev->reset(vdev); |
494 |
|
495 |
vdev->features = 0;
|
496 |
vdev->queue_sel = 0;
|
497 |
vdev->status = 0;
|
498 |
vdev->isr = 0;
|
499 |
virtio_update_irq(vdev); |
500 |
|
501 |
for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
502 |
vdev->vq[i].vring.desc = 0;
|
503 |
vdev->vq[i].vring.avail = 0;
|
504 |
vdev->vq[i].vring.used = 0;
|
505 |
vdev->vq[i].last_avail_idx = 0;
|
506 |
vdev->vq[i].pfn = 0;
|
507 |
} |
508 |
} |
509 |
|
510 |
static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) |
511 |
{ |
512 |
VirtIODevice *vdev = to_virtio_device(opaque); |
513 |
ram_addr_t pa; |
514 |
|
515 |
addr -= vdev->addr; |
516 |
|
517 |
switch (addr) {
|
518 |
case VIRTIO_PCI_GUEST_FEATURES:
|
519 |
if (vdev->set_features)
|
520 |
vdev->set_features(vdev, val); |
521 |
vdev->features = val; |
522 |
break;
|
523 |
case VIRTIO_PCI_QUEUE_PFN:
|
524 |
pa = (ram_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT; |
525 |
vdev->vq[vdev->queue_sel].pfn = val; |
526 |
if (pa == 0) { |
527 |
virtio_reset(vdev); |
528 |
} else {
|
529 |
virtqueue_init(&vdev->vq[vdev->queue_sel], pa); |
530 |
} |
531 |
break;
|
532 |
case VIRTIO_PCI_QUEUE_SEL:
|
533 |
if (val < VIRTIO_PCI_QUEUE_MAX)
|
534 |
vdev->queue_sel = val; |
535 |
break;
|
536 |
case VIRTIO_PCI_QUEUE_NOTIFY:
|
537 |
if (val < VIRTIO_PCI_QUEUE_MAX && vdev->vq[val].vring.desc)
|
538 |
vdev->vq[val].handle_output(vdev, &vdev->vq[val]); |
539 |
break;
|
540 |
case VIRTIO_PCI_STATUS:
|
541 |
vdev->status = val & 0xFF;
|
542 |
if (vdev->status == 0) |
543 |
virtio_reset(vdev); |
544 |
break;
|
545 |
} |
546 |
} |
547 |
|
548 |
static uint32_t virtio_ioport_read(void *opaque, uint32_t addr) |
549 |
{ |
550 |
VirtIODevice *vdev = to_virtio_device(opaque); |
551 |
uint32_t ret = 0xFFFFFFFF;
|
552 |
|
553 |
addr -= vdev->addr; |
554 |
|
555 |
switch (addr) {
|
556 |
case VIRTIO_PCI_HOST_FEATURES:
|
557 |
ret = vdev->get_features(vdev); |
558 |
ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
|
559 |
break;
|
560 |
case VIRTIO_PCI_GUEST_FEATURES:
|
561 |
ret = vdev->features; |
562 |
break;
|
563 |
case VIRTIO_PCI_QUEUE_PFN:
|
564 |
ret = vdev->vq[vdev->queue_sel].pfn; |
565 |
break;
|
566 |
case VIRTIO_PCI_QUEUE_NUM:
|
567 |
ret = vdev->vq[vdev->queue_sel].vring.num; |
568 |
break;
|
569 |
case VIRTIO_PCI_QUEUE_SEL:
|
570 |
ret = vdev->queue_sel; |
571 |
break;
|
572 |
case VIRTIO_PCI_STATUS:
|
573 |
ret = vdev->status; |
574 |
break;
|
575 |
case VIRTIO_PCI_ISR:
|
576 |
/* reading from the ISR also clears it. */
|
577 |
ret = vdev->isr; |
578 |
vdev->isr = 0;
|
579 |
virtio_update_irq(vdev); |
580 |
break;
|
581 |
default:
|
582 |
break;
|
583 |
} |
584 |
|
585 |
return ret;
|
586 |
} |
587 |
|
588 |
static uint32_t virtio_config_readb(void *opaque, uint32_t addr) |
589 |
{ |
590 |
VirtIODevice *vdev = opaque; |
591 |
uint8_t val; |
592 |
|
593 |
vdev->get_config(vdev, vdev->config); |
594 |
|
595 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
596 |
if (addr > (vdev->config_len - sizeof(val))) |
597 |
return (uint32_t)-1; |
598 |
|
599 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
600 |
return val;
|
601 |
} |
602 |
|
603 |
static uint32_t virtio_config_readw(void *opaque, uint32_t addr) |
604 |
{ |
605 |
VirtIODevice *vdev = opaque; |
606 |
uint16_t val; |
607 |
|
608 |
vdev->get_config(vdev, vdev->config); |
609 |
|
610 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
611 |
if (addr > (vdev->config_len - sizeof(val))) |
612 |
return (uint32_t)-1; |
613 |
|
614 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
615 |
return val;
|
616 |
} |
617 |
|
618 |
static uint32_t virtio_config_readl(void *opaque, uint32_t addr) |
619 |
{ |
620 |
VirtIODevice *vdev = opaque; |
621 |
uint32_t val; |
622 |
|
623 |
vdev->get_config(vdev, vdev->config); |
624 |
|
625 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
626 |
if (addr > (vdev->config_len - sizeof(val))) |
627 |
return (uint32_t)-1; |
628 |
|
629 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
630 |
return val;
|
631 |
} |
632 |
|
633 |
static void virtio_config_writeb(void *opaque, uint32_t addr, uint32_t data) |
634 |
{ |
635 |
VirtIODevice *vdev = opaque; |
636 |
uint8_t val = data; |
637 |
|
638 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
639 |
if (addr > (vdev->config_len - sizeof(val))) |
640 |
return;
|
641 |
|
642 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
643 |
|
644 |
if (vdev->set_config)
|
645 |
vdev->set_config(vdev, vdev->config); |
646 |
} |
647 |
|
648 |
static void virtio_config_writew(void *opaque, uint32_t addr, uint32_t data) |
649 |
{ |
650 |
VirtIODevice *vdev = opaque; |
651 |
uint16_t val = data; |
652 |
|
653 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
654 |
if (addr > (vdev->config_len - sizeof(val))) |
655 |
return;
|
656 |
|
657 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
658 |
|
659 |
if (vdev->set_config)
|
660 |
vdev->set_config(vdev, vdev->config); |
661 |
} |
662 |
|
663 |
static void virtio_config_writel(void *opaque, uint32_t addr, uint32_t data) |
664 |
{ |
665 |
VirtIODevice *vdev = opaque; |
666 |
uint32_t val = data; |
667 |
|
668 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
669 |
if (addr > (vdev->config_len - sizeof(val))) |
670 |
return;
|
671 |
|
672 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
673 |
|
674 |
if (vdev->set_config)
|
675 |
vdev->set_config(vdev, vdev->config); |
676 |
} |
677 |
|
678 |
static void virtio_map(PCIDevice *pci_dev, int region_num, |
679 |
uint32_t addr, uint32_t size, int type)
|
680 |
{ |
681 |
VirtIODevice *vdev = to_virtio_device(pci_dev); |
682 |
int i;
|
683 |
|
684 |
vdev->addr = addr; |
685 |
for (i = 0; i < 3; i++) { |
686 |
register_ioport_write(addr, 20, 1 << i, virtio_ioport_write, vdev); |
687 |
register_ioport_read(addr, 20, 1 << i, virtio_ioport_read, vdev); |
688 |
} |
689 |
|
690 |
if (vdev->config_len) {
|
691 |
register_ioport_write(addr + 20, vdev->config_len, 1, |
692 |
virtio_config_writeb, vdev); |
693 |
register_ioport_write(addr + 20, vdev->config_len, 2, |
694 |
virtio_config_writew, vdev); |
695 |
register_ioport_write(addr + 20, vdev->config_len, 4, |
696 |
virtio_config_writel, vdev); |
697 |
register_ioport_read(addr + 20, vdev->config_len, 1, |
698 |
virtio_config_readb, vdev); |
699 |
register_ioport_read(addr + 20, vdev->config_len, 2, |
700 |
virtio_config_readw, vdev); |
701 |
register_ioport_read(addr + 20, vdev->config_len, 4, |
702 |
virtio_config_readl, vdev); |
703 |
|
704 |
vdev->get_config(vdev, vdev->config); |
705 |
} |
706 |
} |
707 |
|
708 |
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
709 |
void (*handle_output)(VirtIODevice *, VirtQueue *))
|
710 |
{ |
711 |
int i;
|
712 |
|
713 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
714 |
if (vdev->vq[i].vring.num == 0) |
715 |
break;
|
716 |
} |
717 |
|
718 |
if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
719 |
abort(); |
720 |
|
721 |
vdev->vq[i].vring.num = queue_size; |
722 |
vdev->vq[i].handle_output = handle_output; |
723 |
|
724 |
return &vdev->vq[i];
|
725 |
} |
726 |
|
727 |
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
728 |
{ |
729 |
/* Always notify when queue is empty (when feature acknowledge) */
|
730 |
if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
|
731 |
(!(vdev->features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
|
732 |
(vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx))) |
733 |
return;
|
734 |
|
735 |
vdev->isr |= 0x01;
|
736 |
virtio_update_irq(vdev); |
737 |
} |
738 |
|
739 |
void virtio_notify_config(VirtIODevice *vdev)
|
740 |
{ |
741 |
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
742 |
return;
|
743 |
|
744 |
vdev->isr |= 0x03;
|
745 |
virtio_update_irq(vdev); |
746 |
} |
747 |
|
748 |
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
749 |
{ |
750 |
int i;
|
751 |
|
752 |
pci_device_save(&vdev->pci_dev, f); |
753 |
|
754 |
qemu_put_be32s(f, &vdev->addr); |
755 |
qemu_put_8s(f, &vdev->status); |
756 |
qemu_put_8s(f, &vdev->isr); |
757 |
qemu_put_be16s(f, &vdev->queue_sel); |
758 |
qemu_put_be32s(f, &vdev->features); |
759 |
qemu_put_be32(f, vdev->config_len); |
760 |
qemu_put_buffer(f, vdev->config, vdev->config_len); |
761 |
|
762 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
763 |
if (vdev->vq[i].vring.num == 0) |
764 |
break;
|
765 |
} |
766 |
|
767 |
qemu_put_be32(f, i); |
768 |
|
769 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
770 |
if (vdev->vq[i].vring.num == 0) |
771 |
break;
|
772 |
|
773 |
qemu_put_be32(f, vdev->vq[i].vring.num); |
774 |
qemu_put_be32s(f, &vdev->vq[i].pfn); |
775 |
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
776 |
} |
777 |
} |
778 |
|
779 |
void virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
780 |
{ |
781 |
int num, i;
|
782 |
|
783 |
pci_device_load(&vdev->pci_dev, f); |
784 |
|
785 |
qemu_get_be32s(f, &vdev->addr); |
786 |
qemu_get_8s(f, &vdev->status); |
787 |
qemu_get_8s(f, &vdev->isr); |
788 |
qemu_get_be16s(f, &vdev->queue_sel); |
789 |
qemu_get_be32s(f, &vdev->features); |
790 |
vdev->config_len = qemu_get_be32(f); |
791 |
qemu_get_buffer(f, vdev->config, vdev->config_len); |
792 |
|
793 |
num = qemu_get_be32(f); |
794 |
|
795 |
for (i = 0; i < num; i++) { |
796 |
vdev->vq[i].vring.num = qemu_get_be32(f); |
797 |
qemu_get_be32s(f, &vdev->vq[i].pfn); |
798 |
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
799 |
|
800 |
if (vdev->vq[i].pfn) {
|
801 |
target_phys_addr_t pa; |
802 |
|
803 |
pa = (ram_addr_t)vdev->vq[i].pfn << VIRTIO_PCI_QUEUE_ADDR_SHIFT; |
804 |
virtqueue_init(&vdev->vq[i], pa); |
805 |
} |
806 |
} |
807 |
|
808 |
virtio_update_irq(vdev); |
809 |
} |
810 |
|
811 |
VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name, |
812 |
uint16_t vendor, uint16_t device, |
813 |
uint16_t subvendor, uint16_t subdevice, |
814 |
uint16_t class_code, uint8_t pif, |
815 |
size_t config_size, size_t struct_size) |
816 |
{ |
817 |
VirtIODevice *vdev; |
818 |
PCIDevice *pci_dev; |
819 |
uint8_t *config; |
820 |
uint32_t size; |
821 |
|
822 |
pci_dev = pci_register_device(bus, name, struct_size, |
823 |
-1, NULL, NULL); |
824 |
if (!pci_dev)
|
825 |
return NULL; |
826 |
|
827 |
vdev = to_virtio_device(pci_dev); |
828 |
|
829 |
vdev->status = 0;
|
830 |
vdev->isr = 0;
|
831 |
vdev->queue_sel = 0;
|
832 |
vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
833 |
|
834 |
config = pci_dev->config; |
835 |
pci_config_set_vendor_id(config, vendor); |
836 |
pci_config_set_device_id(config, device); |
837 |
|
838 |
config[0x08] = VIRTIO_PCI_ABI_VERSION;
|
839 |
|
840 |
config[0x09] = pif;
|
841 |
pci_config_set_class(config, class_code); |
842 |
config[0x0e] = 0x00; |
843 |
|
844 |
config[0x2c] = subvendor & 0xFF; |
845 |
config[0x2d] = (subvendor >> 8) & 0xFF; |
846 |
config[0x2e] = subdevice & 0xFF; |
847 |
config[0x2f] = (subdevice >> 8) & 0xFF; |
848 |
|
849 |
config[0x3d] = 1; |
850 |
|
851 |
vdev->name = name; |
852 |
vdev->config_len = config_size; |
853 |
if (vdev->config_len)
|
854 |
vdev->config = qemu_mallocz(config_size); |
855 |
else
|
856 |
vdev->config = NULL;
|
857 |
|
858 |
size = 20 + config_size;
|
859 |
if (size & (size-1)) |
860 |
size = 1 << qemu_fls(size);
|
861 |
|
862 |
pci_register_io_region(pci_dev, 0, size, PCI_ADDRESS_SPACE_IO,
|
863 |
virtio_map); |
864 |
qemu_register_reset(virtio_reset, vdev); |
865 |
|
866 |
return vdev;
|
867 |
} |