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Commit | Line | Data |
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7b2e5c65 MAL |
1 | /* |
2 | * Vhost User library | |
3 | * | |
4 | * Copyright IBM, Corp. 2007 | |
5 | * Copyright (c) 2016 Red Hat, Inc. | |
6 | * | |
7 | * Authors: | |
8 | * Anthony Liguori <aliguori@us.ibm.com> | |
9 | * Marc-André Lureau <mlureau@redhat.com> | |
10 | * Victor Kaplansky <victork@redhat.com> | |
11 | * | |
12 | * This work is licensed under the terms of the GNU GPL, version 2 or | |
13 | * later. See the COPYING file in the top-level directory. | |
14 | */ | |
15 | ||
dadc3d01 MH |
16 | #ifndef _GNU_SOURCE |
17 | #define _GNU_SOURCE | |
18 | #endif | |
19 | ||
eb078a9f MAL |
20 | /* this code avoids GLib dependency */ |
21 | #include <stdlib.h> | |
22 | #include <stdio.h> | |
23 | #include <unistd.h> | |
24 | #include <stdarg.h> | |
25 | #include <errno.h> | |
26 | #include <string.h> | |
27 | #include <assert.h> | |
28 | #include <inttypes.h> | |
29 | #include <sys/types.h> | |
30 | #include <sys/socket.h> | |
7b2e5c65 | 31 | #include <sys/eventfd.h> |
eb078a9f | 32 | #include <sys/mman.h> |
0ca29315 | 33 | #include <endian.h> |
2a84ffc0 | 34 | |
193ba660 DDT |
35 | /* Necessary to provide VIRTIO_F_VERSION_1 on system |
36 | * with older linux headers. Must appear before | |
37 | * <linux/vhost.h> below. | |
38 | */ | |
39 | #include "standard-headers/linux/virtio_config.h" | |
40 | ||
2a84ffc0 DDAG |
41 | #if defined(__linux__) |
42 | #include <sys/syscall.h> | |
43 | #include <fcntl.h> | |
44 | #include <sys/ioctl.h> | |
7b2e5c65 MAL |
45 | #include <linux/vhost.h> |
46 | ||
2a84ffc0 DDAG |
47 | #ifdef __NR_userfaultfd |
48 | #include <linux/userfaultfd.h> | |
49 | #endif | |
50 | ||
51 | #endif | |
52 | ||
3f55f97b | 53 | #include "include/atomic.h" |
7b2e5c65 MAL |
54 | |
55 | #include "libvhost-user.h" | |
56 | ||
eb078a9f | 57 | /* usually provided by GLib */ |
52a57d8d SW |
58 | #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4) |
59 | #if !defined(__clang__) && (__GNUC__ == 4 && __GNUC_MINOR__ == 4) | |
60 | #define G_GNUC_PRINTF(format_idx, arg_idx) \ | |
61 | __attribute__((__format__(gnu_printf, format_idx, arg_idx))) | |
62 | #else | |
63 | #define G_GNUC_PRINTF(format_idx, arg_idx) \ | |
64 | __attribute__((__format__(__printf__, format_idx, arg_idx))) | |
65 | #endif | |
66 | #else /* !__GNUC__ */ | |
67 | #define G_GNUC_PRINTF(format_idx, arg_idx) | |
68 | #endif /* !__GNUC__ */ | |
eb078a9f MAL |
69 | #ifndef MIN |
70 | #define MIN(x, y) ({ \ | |
aa5d395a MH |
71 | __typeof__(x) _min1 = (x); \ |
72 | __typeof__(y) _min2 = (y); \ | |
eb078a9f MAL |
73 | (void) (&_min1 == &_min2); \ |
74 | _min1 < _min2 ? _min1 : _min2; }) | |
75 | #endif | |
76 | ||
5f9ff1ef XY |
77 | /* Round number down to multiple */ |
78 | #define ALIGN_DOWN(n, m) ((n) / (m) * (m)) | |
79 | ||
80 | /* Round number up to multiple */ | |
81 | #define ALIGN_UP(n, m) ALIGN_DOWN((n) + (m) - 1, (m)) | |
82 | ||
7fa1d616 MAL |
83 | #ifndef unlikely |
84 | #define unlikely(x) __builtin_expect(!!(x), 0) | |
85 | #endif | |
86 | ||
5f9ff1ef XY |
87 | /* Align each region to cache line size in inflight buffer */ |
88 | #define INFLIGHT_ALIGNMENT 64 | |
89 | ||
90 | /* The version of inflight buffer */ | |
91 | #define INFLIGHT_VERSION 1 | |
92 | ||
7b2e5c65 MAL |
93 | /* The version of the protocol we support */ |
94 | #define VHOST_USER_VERSION 1 | |
95 | #define LIBVHOST_USER_DEBUG 0 | |
96 | ||
97 | #define DPRINT(...) \ | |
98 | do { \ | |
99 | if (LIBVHOST_USER_DEBUG) { \ | |
100 | fprintf(stderr, __VA_ARGS__); \ | |
101 | } \ | |
102 | } while (0) | |
103 | ||
5f9ff1ef XY |
104 | static inline |
105 | bool has_feature(uint64_t features, unsigned int fbit) | |
106 | { | |
107 | assert(fbit < 64); | |
108 | return !!(features & (1ULL << fbit)); | |
109 | } | |
110 | ||
111 | static inline | |
112 | bool vu_has_feature(VuDev *dev, | |
113 | unsigned int fbit) | |
114 | { | |
115 | return has_feature(dev->features, fbit); | |
116 | } | |
117 | ||
eeb39263 JB |
118 | static inline bool vu_has_protocol_feature(VuDev *dev, unsigned int fbit) |
119 | { | |
120 | return has_feature(dev->protocol_features, fbit); | |
121 | } | |
122 | ||
467eeb0f | 123 | const char * |
ea642e22 | 124 | vu_request_to_string(unsigned int req) |
7b2e5c65 MAL |
125 | { |
126 | #define REQ(req) [req] = #req | |
127 | static const char *vu_request_str[] = { | |
7b2e5c65 MAL |
128 | REQ(VHOST_USER_NONE), |
129 | REQ(VHOST_USER_GET_FEATURES), | |
130 | REQ(VHOST_USER_SET_FEATURES), | |
131 | REQ(VHOST_USER_SET_OWNER), | |
132 | REQ(VHOST_USER_RESET_OWNER), | |
133 | REQ(VHOST_USER_SET_MEM_TABLE), | |
134 | REQ(VHOST_USER_SET_LOG_BASE), | |
135 | REQ(VHOST_USER_SET_LOG_FD), | |
136 | REQ(VHOST_USER_SET_VRING_NUM), | |
137 | REQ(VHOST_USER_SET_VRING_ADDR), | |
138 | REQ(VHOST_USER_SET_VRING_BASE), | |
139 | REQ(VHOST_USER_GET_VRING_BASE), | |
140 | REQ(VHOST_USER_SET_VRING_KICK), | |
141 | REQ(VHOST_USER_SET_VRING_CALL), | |
142 | REQ(VHOST_USER_SET_VRING_ERR), | |
143 | REQ(VHOST_USER_GET_PROTOCOL_FEATURES), | |
144 | REQ(VHOST_USER_SET_PROTOCOL_FEATURES), | |
145 | REQ(VHOST_USER_GET_QUEUE_NUM), | |
146 | REQ(VHOST_USER_SET_VRING_ENABLE), | |
147 | REQ(VHOST_USER_SEND_RARP), | |
ea642e22 | 148 | REQ(VHOST_USER_NET_SET_MTU), |
e608feed | 149 | REQ(VHOST_USER_SET_BACKEND_REQ_FD), |
ea642e22 DDAG |
150 | REQ(VHOST_USER_IOTLB_MSG), |
151 | REQ(VHOST_USER_SET_VRING_ENDIAN), | |
0bc24d83 CL |
152 | REQ(VHOST_USER_GET_CONFIG), |
153 | REQ(VHOST_USER_SET_CONFIG), | |
d3dff7a5 | 154 | REQ(VHOST_USER_POSTCOPY_ADVISE), |
6864a7b5 | 155 | REQ(VHOST_USER_POSTCOPY_LISTEN), |
c639187e | 156 | REQ(VHOST_USER_POSTCOPY_END), |
5f9ff1ef XY |
157 | REQ(VHOST_USER_GET_INFLIGHT_FD), |
158 | REQ(VHOST_USER_SET_INFLIGHT_FD), | |
bd2e44fe | 159 | REQ(VHOST_USER_GPU_SET_SOCKET), |
ff132005 | 160 | REQ(VHOST_USER_VRING_KICK), |
6fb2e173 | 161 | REQ(VHOST_USER_GET_MAX_MEM_SLOTS), |
ec94c8e6 | 162 | REQ(VHOST_USER_ADD_MEM_REG), |
875b9fd9 | 163 | REQ(VHOST_USER_REM_MEM_REG), |
ce0f3b03 | 164 | REQ(VHOST_USER_GET_SHARED_OBJECT), |
7b2e5c65 MAL |
165 | REQ(VHOST_USER_MAX), |
166 | }; | |
167 | #undef REQ | |
168 | ||
169 | if (req < VHOST_USER_MAX) { | |
170 | return vu_request_str[req]; | |
171 | } else { | |
172 | return "unknown"; | |
173 | } | |
174 | } | |
175 | ||
52a57d8d | 176 | static void G_GNUC_PRINTF(2, 3) |
7b2e5c65 MAL |
177 | vu_panic(VuDev *dev, const char *msg, ...) |
178 | { | |
179 | char *buf = NULL; | |
180 | va_list ap; | |
181 | ||
182 | va_start(ap, msg); | |
eb078a9f MAL |
183 | if (vasprintf(&buf, msg, ap) < 0) { |
184 | buf = NULL; | |
185 | } | |
7b2e5c65 MAL |
186 | va_end(ap); |
187 | ||
188 | dev->broken = true; | |
189 | dev->panic(dev, buf); | |
190 | free(buf); | |
191 | ||
ff132005 JB |
192 | /* |
193 | * FIXME: | |
194 | * find a way to call virtio_error, or perhaps close the connection? | |
195 | */ | |
7b2e5c65 MAL |
196 | } |
197 | ||
198 | /* Translate guest physical address to our virtual address. */ | |
199 | void * | |
293084a7 | 200 | vu_gpa_to_va(VuDev *dev, uint64_t *plen, uint64_t guest_addr) |
7b2e5c65 | 201 | { |
92bf2461 | 202 | unsigned int i; |
7b2e5c65 | 203 | |
293084a7 YX |
204 | if (*plen == 0) { |
205 | return NULL; | |
206 | } | |
207 | ||
7b2e5c65 MAL |
208 | /* Find matching memory region. */ |
209 | for (i = 0; i < dev->nregions; i++) { | |
210 | VuDevRegion *r = &dev->regions[i]; | |
211 | ||
212 | if ((guest_addr >= r->gpa) && (guest_addr < (r->gpa + r->size))) { | |
293084a7 YX |
213 | if ((guest_addr + *plen) > (r->gpa + r->size)) { |
214 | *plen = r->gpa + r->size - guest_addr; | |
215 | } | |
7b2e5c65 MAL |
216 | return (void *)(uintptr_t) |
217 | guest_addr - r->gpa + r->mmap_addr + r->mmap_offset; | |
218 | } | |
219 | } | |
220 | ||
221 | return NULL; | |
222 | } | |
223 | ||
224 | /* Translate qemu virtual address to our virtual address. */ | |
225 | static void * | |
226 | qva_to_va(VuDev *dev, uint64_t qemu_addr) | |
227 | { | |
92bf2461 | 228 | unsigned int i; |
7b2e5c65 MAL |
229 | |
230 | /* Find matching memory region. */ | |
231 | for (i = 0; i < dev->nregions; i++) { | |
232 | VuDevRegion *r = &dev->regions[i]; | |
233 | ||
234 | if ((qemu_addr >= r->qva) && (qemu_addr < (r->qva + r->size))) { | |
235 | return (void *)(uintptr_t) | |
236 | qemu_addr - r->qva + r->mmap_addr + r->mmap_offset; | |
237 | } | |
238 | } | |
239 | ||
240 | return NULL; | |
241 | } | |
242 | ||
243 | static void | |
244 | vmsg_close_fds(VhostUserMsg *vmsg) | |
245 | { | |
246 | int i; | |
247 | ||
248 | for (i = 0; i < vmsg->fd_num; i++) { | |
249 | close(vmsg->fds[i]); | |
250 | } | |
251 | } | |
252 | ||
db68f4ff SH |
253 | /* Set reply payload.u64 and clear request flags and fd_num */ |
254 | static void vmsg_set_reply_u64(VhostUserMsg *vmsg, uint64_t val) | |
255 | { | |
256 | vmsg->flags = 0; /* defaults will be set by vu_send_reply() */ | |
257 | vmsg->size = sizeof(vmsg->payload.u64); | |
258 | vmsg->payload.u64 = val; | |
259 | vmsg->fd_num = 0; | |
260 | } | |
261 | ||
4275cd99 DDAG |
262 | /* A test to see if we have userfault available */ |
263 | static bool | |
264 | have_userfault(void) | |
265 | { | |
266 | #if defined(__linux__) && defined(__NR_userfaultfd) &&\ | |
267 | defined(UFFD_FEATURE_MISSING_SHMEM) &&\ | |
268 | defined(UFFD_FEATURE_MISSING_HUGETLBFS) | |
269 | /* Now test the kernel we're running on really has the features */ | |
270 | int ufd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK); | |
271 | struct uffdio_api api_struct; | |
272 | if (ufd < 0) { | |
273 | return false; | |
274 | } | |
275 | ||
276 | api_struct.api = UFFD_API; | |
277 | api_struct.features = UFFD_FEATURE_MISSING_SHMEM | | |
278 | UFFD_FEATURE_MISSING_HUGETLBFS; | |
279 | if (ioctl(ufd, UFFDIO_API, &api_struct)) { | |
280 | close(ufd); | |
281 | return false; | |
282 | } | |
283 | close(ufd); | |
284 | return true; | |
285 | ||
286 | #else | |
287 | return false; | |
288 | #endif | |
289 | } | |
290 | ||
7b2e5c65 | 291 | static bool |
049f5550 | 292 | vu_message_read_default(VuDev *dev, int conn_fd, VhostUserMsg *vmsg) |
7b2e5c65 | 293 | { |
b650d5f4 | 294 | char control[CMSG_SPACE(VHOST_MEMORY_BASELINE_NREGIONS * sizeof(int))] = {}; |
7b2e5c65 MAL |
295 | struct iovec iov = { |
296 | .iov_base = (char *)vmsg, | |
297 | .iov_len = VHOST_USER_HDR_SIZE, | |
298 | }; | |
299 | struct msghdr msg = { | |
300 | .msg_iov = &iov, | |
301 | .msg_iovlen = 1, | |
302 | .msg_control = control, | |
303 | .msg_controllen = sizeof(control), | |
304 | }; | |
305 | size_t fd_size; | |
306 | struct cmsghdr *cmsg; | |
307 | int rc; | |
308 | ||
309 | do { | |
310 | rc = recvmsg(conn_fd, &msg, 0); | |
311 | } while (rc < 0 && (errno == EINTR || errno == EAGAIN)); | |
312 | ||
2566378d | 313 | if (rc < 0) { |
7b2e5c65 MAL |
314 | vu_panic(dev, "Error while recvmsg: %s", strerror(errno)); |
315 | return false; | |
316 | } | |
317 | ||
318 | vmsg->fd_num = 0; | |
319 | for (cmsg = CMSG_FIRSTHDR(&msg); | |
320 | cmsg != NULL; | |
321 | cmsg = CMSG_NXTHDR(&msg, cmsg)) | |
322 | { | |
323 | if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) { | |
324 | fd_size = cmsg->cmsg_len - CMSG_LEN(0); | |
325 | vmsg->fd_num = fd_size / sizeof(int); | |
a6f4d2ec | 326 | assert(fd_size < VHOST_MEMORY_BASELINE_NREGIONS); |
7b2e5c65 MAL |
327 | memcpy(vmsg->fds, CMSG_DATA(cmsg), fd_size); |
328 | break; | |
329 | } | |
330 | } | |
331 | ||
332 | if (vmsg->size > sizeof(vmsg->payload)) { | |
333 | vu_panic(dev, | |
334 | "Error: too big message request: %d, size: vmsg->size: %u, " | |
335 | "while sizeof(vmsg->payload) = %zu\n", | |
336 | vmsg->request, vmsg->size, sizeof(vmsg->payload)); | |
337 | goto fail; | |
338 | } | |
339 | ||
340 | if (vmsg->size) { | |
341 | do { | |
342 | rc = read(conn_fd, &vmsg->payload, vmsg->size); | |
343 | } while (rc < 0 && (errno == EINTR || errno == EAGAIN)); | |
344 | ||
345 | if (rc <= 0) { | |
346 | vu_panic(dev, "Error while reading: %s", strerror(errno)); | |
347 | goto fail; | |
348 | } | |
349 | ||
18fa7f1e | 350 | assert((uint32_t)rc == vmsg->size); |
7b2e5c65 MAL |
351 | } |
352 | ||
353 | return true; | |
354 | ||
355 | fail: | |
356 | vmsg_close_fds(vmsg); | |
357 | ||
358 | return false; | |
359 | } | |
360 | ||
361 | static bool | |
362 | vu_message_write(VuDev *dev, int conn_fd, VhostUserMsg *vmsg) | |
363 | { | |
364 | int rc; | |
365 | uint8_t *p = (uint8_t *)vmsg; | |
b650d5f4 | 366 | char control[CMSG_SPACE(VHOST_MEMORY_BASELINE_NREGIONS * sizeof(int))] = {}; |
d6e47717 DDAG |
367 | struct iovec iov = { |
368 | .iov_base = (char *)vmsg, | |
369 | .iov_len = VHOST_USER_HDR_SIZE, | |
370 | }; | |
371 | struct msghdr msg = { | |
372 | .msg_iov = &iov, | |
373 | .msg_iovlen = 1, | |
374 | .msg_control = control, | |
375 | }; | |
376 | struct cmsghdr *cmsg; | |
377 | ||
378 | memset(control, 0, sizeof(control)); | |
b650d5f4 | 379 | assert(vmsg->fd_num <= VHOST_MEMORY_BASELINE_NREGIONS); |
d6e47717 DDAG |
380 | if (vmsg->fd_num > 0) { |
381 | size_t fdsize = vmsg->fd_num * sizeof(int); | |
382 | msg.msg_controllen = CMSG_SPACE(fdsize); | |
383 | cmsg = CMSG_FIRSTHDR(&msg); | |
384 | cmsg->cmsg_len = CMSG_LEN(fdsize); | |
385 | cmsg->cmsg_level = SOL_SOCKET; | |
386 | cmsg->cmsg_type = SCM_RIGHTS; | |
387 | memcpy(CMSG_DATA(cmsg), vmsg->fds, fdsize); | |
388 | } else { | |
389 | msg.msg_controllen = 0; | |
390 | } | |
7b2e5c65 | 391 | |
7b2e5c65 | 392 | do { |
d6e47717 | 393 | rc = sendmsg(conn_fd, &msg, 0); |
7b2e5c65 MAL |
394 | } while (rc < 0 && (errno == EINTR || errno == EAGAIN)); |
395 | ||
e3638151 DDAG |
396 | if (vmsg->size) { |
397 | do { | |
398 | if (vmsg->data) { | |
399 | rc = write(conn_fd, vmsg->data, vmsg->size); | |
400 | } else { | |
401 | rc = write(conn_fd, p + VHOST_USER_HDR_SIZE, vmsg->size); | |
402 | } | |
403 | } while (rc < 0 && (errno == EINTR || errno == EAGAIN)); | |
404 | } | |
7b2e5c65 MAL |
405 | |
406 | if (rc <= 0) { | |
407 | vu_panic(dev, "Error while writing: %s", strerror(errno)); | |
408 | return false; | |
409 | } | |
410 | ||
411 | return true; | |
412 | } | |
413 | ||
d84599f5 TB |
414 | static bool |
415 | vu_send_reply(VuDev *dev, int conn_fd, VhostUserMsg *vmsg) | |
416 | { | |
417 | /* Set the version in the flags when sending the reply */ | |
418 | vmsg->flags &= ~VHOST_USER_VERSION_MASK; | |
419 | vmsg->flags |= VHOST_USER_VERSION; | |
420 | vmsg->flags |= VHOST_USER_REPLY_MASK; | |
421 | ||
422 | return vu_message_write(dev, conn_fd, vmsg); | |
423 | } | |
424 | ||
c25c02b9 | 425 | /* |
f8ed3648 MP |
426 | * Processes a reply on the backend channel. |
427 | * Entered with backend_mutex held and releases it before exit. | |
c25c02b9 DDAG |
428 | * Returns true on success. |
429 | */ | |
d84599f5 TB |
430 | static bool |
431 | vu_process_message_reply(VuDev *dev, const VhostUserMsg *vmsg) | |
432 | { | |
433 | VhostUserMsg msg_reply; | |
c25c02b9 | 434 | bool result = false; |
d84599f5 TB |
435 | |
436 | if ((vmsg->flags & VHOST_USER_NEED_REPLY_MASK) == 0) { | |
c25c02b9 DDAG |
437 | result = true; |
438 | goto out; | |
d84599f5 TB |
439 | } |
440 | ||
f8ed3648 | 441 | if (!vu_message_read_default(dev, dev->backend_fd, &msg_reply)) { |
c25c02b9 | 442 | goto out; |
d84599f5 TB |
443 | } |
444 | ||
445 | if (msg_reply.request != vmsg->request) { | |
446 | DPRINT("Received unexpected msg type. Expected %d received %d", | |
447 | vmsg->request, msg_reply.request); | |
c25c02b9 | 448 | goto out; |
d84599f5 TB |
449 | } |
450 | ||
c25c02b9 DDAG |
451 | result = msg_reply.payload.u64 == 0; |
452 | ||
453 | out: | |
f8ed3648 | 454 | pthread_mutex_unlock(&dev->backend_mutex); |
c25c02b9 | 455 | return result; |
d84599f5 TB |
456 | } |
457 | ||
7b2e5c65 MAL |
458 | /* Kick the log_call_fd if required. */ |
459 | static void | |
460 | vu_log_kick(VuDev *dev) | |
461 | { | |
462 | if (dev->log_call_fd != -1) { | |
463 | DPRINT("Kicking the QEMU's log...\n"); | |
464 | if (eventfd_write(dev->log_call_fd, 1) < 0) { | |
465 | vu_panic(dev, "Error writing eventfd: %s", strerror(errno)); | |
466 | } | |
467 | } | |
468 | } | |
469 | ||
470 | static void | |
471 | vu_log_page(uint8_t *log_table, uint64_t page) | |
472 | { | |
473 | DPRINT("Logged dirty guest page: %"PRId64"\n", page); | |
d73415a3 | 474 | qatomic_or(&log_table[page / 8], 1 << (page % 8)); |
7b2e5c65 MAL |
475 | } |
476 | ||
477 | static void | |
478 | vu_log_write(VuDev *dev, uint64_t address, uint64_t length) | |
479 | { | |
480 | uint64_t page; | |
481 | ||
482 | if (!(dev->features & (1ULL << VHOST_F_LOG_ALL)) || | |
483 | !dev->log_table || !length) { | |
484 | return; | |
485 | } | |
486 | ||
487 | assert(dev->log_size > ((address + length - 1) / VHOST_LOG_PAGE / 8)); | |
488 | ||
489 | page = address / VHOST_LOG_PAGE; | |
490 | while (page * VHOST_LOG_PAGE < address + length) { | |
491 | vu_log_page(dev->log_table, page); | |
acbd487d | 492 | page += 1; |
7b2e5c65 MAL |
493 | } |
494 | ||
495 | vu_log_kick(dev); | |
496 | } | |
497 | ||
498 | static void | |
499 | vu_kick_cb(VuDev *dev, int condition, void *data) | |
500 | { | |
501 | int index = (intptr_t)data; | |
502 | VuVirtq *vq = &dev->vq[index]; | |
503 | int sock = vq->kick_fd; | |
504 | eventfd_t kick_data; | |
505 | ssize_t rc; | |
506 | ||
507 | rc = eventfd_read(sock, &kick_data); | |
508 | if (rc == -1) { | |
509 | vu_panic(dev, "kick eventfd_read(): %s", strerror(errno)); | |
510 | dev->remove_watch(dev, dev->vq[index].kick_fd); | |
511 | } else { | |
512 | DPRINT("Got kick_data: %016"PRIx64" handler:%p idx:%d\n", | |
513 | kick_data, vq->handler, index); | |
514 | if (vq->handler) { | |
515 | vq->handler(dev, index); | |
516 | } | |
517 | } | |
518 | } | |
519 | ||
520 | static bool | |
521 | vu_get_features_exec(VuDev *dev, VhostUserMsg *vmsg) | |
522 | { | |
523 | vmsg->payload.u64 = | |
a9a5c473 SH |
524 | /* |
525 | * The following VIRTIO feature bits are supported by our virtqueue | |
526 | * implementation: | |
527 | */ | |
528 | 1ULL << VIRTIO_F_NOTIFY_ON_EMPTY | | |
529 | 1ULL << VIRTIO_RING_F_INDIRECT_DESC | | |
530 | 1ULL << VIRTIO_RING_F_EVENT_IDX | | |
531 | 1ULL << VIRTIO_F_VERSION_1 | | |
532 | ||
533 | /* vhost-user feature bits */ | |
7b2e5c65 MAL |
534 | 1ULL << VHOST_F_LOG_ALL | |
535 | 1ULL << VHOST_USER_F_PROTOCOL_FEATURES; | |
536 | ||
537 | if (dev->iface->get_features) { | |
538 | vmsg->payload.u64 |= dev->iface->get_features(dev); | |
539 | } | |
540 | ||
541 | vmsg->size = sizeof(vmsg->payload.u64); | |
d6e47717 | 542 | vmsg->fd_num = 0; |
7b2e5c65 MAL |
543 | |
544 | DPRINT("Sending back to guest u64: 0x%016"PRIx64"\n", vmsg->payload.u64); | |
545 | ||
546 | return true; | |
547 | } | |
548 | ||
549 | static void | |
550 | vu_set_enable_all_rings(VuDev *dev, bool enabled) | |
551 | { | |
6f5fd837 | 552 | uint16_t i; |
7b2e5c65 | 553 | |
6f5fd837 | 554 | for (i = 0; i < dev->max_queues; i++) { |
7b2e5c65 MAL |
555 | dev->vq[i].enable = enabled; |
556 | } | |
557 | } | |
558 | ||
559 | static bool | |
560 | vu_set_features_exec(VuDev *dev, VhostUserMsg *vmsg) | |
561 | { | |
562 | DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); | |
563 | ||
564 | dev->features = vmsg->payload.u64; | |
2ffc5470 MH |
565 | if (!vu_has_feature(dev, VIRTIO_F_VERSION_1)) { |
566 | /* | |
567 | * We only support devices conforming to VIRTIO 1.0 or | |
568 | * later | |
569 | */ | |
570 | vu_panic(dev, "virtio legacy devices aren't supported by libvhost-user"); | |
571 | return false; | |
572 | } | |
7b2e5c65 MAL |
573 | |
574 | if (!(dev->features & VHOST_USER_F_PROTOCOL_FEATURES)) { | |
575 | vu_set_enable_all_rings(dev, true); | |
576 | } | |
577 | ||
578 | if (dev->iface->set_features) { | |
579 | dev->iface->set_features(dev, dev->features); | |
580 | } | |
581 | ||
582 | return false; | |
583 | } | |
584 | ||
585 | static bool | |
586 | vu_set_owner_exec(VuDev *dev, VhostUserMsg *vmsg) | |
587 | { | |
588 | return false; | |
589 | } | |
590 | ||
591 | static void | |
592 | vu_close_log(VuDev *dev) | |
593 | { | |
594 | if (dev->log_table) { | |
595 | if (munmap(dev->log_table, dev->log_size) != 0) { | |
596 | perror("close log munmap() error"); | |
597 | } | |
598 | ||
599 | dev->log_table = NULL; | |
600 | } | |
601 | if (dev->log_call_fd != -1) { | |
602 | close(dev->log_call_fd); | |
603 | dev->log_call_fd = -1; | |
604 | } | |
605 | } | |
606 | ||
607 | static bool | |
608 | vu_reset_device_exec(VuDev *dev, VhostUserMsg *vmsg) | |
609 | { | |
610 | vu_set_enable_all_rings(dev, false); | |
611 | ||
612 | return false; | |
613 | } | |
614 | ||
49e9ec74 DDAG |
615 | static bool |
616 | map_ring(VuDev *dev, VuVirtq *vq) | |
617 | { | |
618 | vq->vring.desc = qva_to_va(dev, vq->vra.desc_user_addr); | |
619 | vq->vring.used = qva_to_va(dev, vq->vra.used_user_addr); | |
620 | vq->vring.avail = qva_to_va(dev, vq->vra.avail_user_addr); | |
621 | ||
622 | DPRINT("Setting virtq addresses:\n"); | |
623 | DPRINT(" vring_desc at %p\n", vq->vring.desc); | |
624 | DPRINT(" vring_used at %p\n", vq->vring.used); | |
625 | DPRINT(" vring_avail at %p\n", vq->vring.avail); | |
626 | ||
627 | return !(vq->vring.desc && vq->vring.used && vq->vring.avail); | |
628 | } | |
629 | ||
08fccf8f RN |
630 | static bool |
631 | generate_faults(VuDev *dev) { | |
92bf2461 | 632 | unsigned int i; |
08fccf8f | 633 | for (i = 0; i < dev->nregions; i++) { |
bb302772 | 634 | #ifdef UFFDIO_REGISTER |
08fccf8f RN |
635 | VuDevRegion *dev_region = &dev->regions[i]; |
636 | int ret; | |
d87a6424 MH |
637 | struct uffdio_register reg_struct; |
638 | ||
08fccf8f RN |
639 | /* |
640 | * We should already have an open ufd. Mark each memory | |
641 | * range as ufd. | |
642 | * Discard any mapping we have here; note I can't use MADV_REMOVE | |
643 | * or fallocate to make the hole since I don't want to lose | |
644 | * data that's already arrived in the shared process. | |
645 | * TODO: How to do hugepage | |
646 | */ | |
647 | ret = madvise((void *)(uintptr_t)dev_region->mmap_addr, | |
648 | dev_region->size + dev_region->mmap_offset, | |
649 | MADV_DONTNEED); | |
650 | if (ret) { | |
651 | fprintf(stderr, | |
652 | "%s: Failed to madvise(DONTNEED) region %d: %s\n", | |
653 | __func__, i, strerror(errno)); | |
654 | } | |
655 | /* | |
656 | * Turn off transparent hugepages so we dont get lose wakeups | |
657 | * in neighbouring pages. | |
658 | * TODO: Turn this backon later. | |
659 | */ | |
660 | ret = madvise((void *)(uintptr_t)dev_region->mmap_addr, | |
661 | dev_region->size + dev_region->mmap_offset, | |
662 | MADV_NOHUGEPAGE); | |
663 | if (ret) { | |
664 | /* | |
665 | * Note: This can happen legally on kernels that are configured | |
666 | * without madvise'able hugepages | |
667 | */ | |
668 | fprintf(stderr, | |
669 | "%s: Failed to madvise(NOHUGEPAGE) region %d: %s\n", | |
670 | __func__, i, strerror(errno)); | |
671 | } | |
d87a6424 | 672 | |
08fccf8f RN |
673 | reg_struct.range.start = (uintptr_t)dev_region->mmap_addr; |
674 | reg_struct.range.len = dev_region->size + dev_region->mmap_offset; | |
675 | reg_struct.mode = UFFDIO_REGISTER_MODE_MISSING; | |
676 | ||
677 | if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER, ®_struct)) { | |
678 | vu_panic(dev, "%s: Failed to userfault region %d " | |
7d4774e6 SW |
679 | "@%" PRIx64 " + size:%" PRIx64 " offset: %" PRIx64 |
680 | ": (ufd=%d)%s\n", | |
08fccf8f RN |
681 | __func__, i, |
682 | dev_region->mmap_addr, | |
683 | dev_region->size, dev_region->mmap_offset, | |
684 | dev->postcopy_ufd, strerror(errno)); | |
685 | return false; | |
686 | } | |
73b49878 | 687 | if (!(reg_struct.ioctls & (1ULL << _UFFDIO_COPY))) { |
08fccf8f RN |
688 | vu_panic(dev, "%s Region (%d) doesn't support COPY", |
689 | __func__, i); | |
690 | return false; | |
691 | } | |
692 | DPRINT("%s: region %d: Registered userfault for %" | |
693 | PRIx64 " + %" PRIx64 "\n", __func__, i, | |
694 | (uint64_t)reg_struct.range.start, | |
695 | (uint64_t)reg_struct.range.len); | |
696 | /* Now it's registered we can let the client at it */ | |
697 | if (mprotect((void *)(uintptr_t)dev_region->mmap_addr, | |
698 | dev_region->size + dev_region->mmap_offset, | |
699 | PROT_READ | PROT_WRITE)) { | |
700 | vu_panic(dev, "failed to mprotect region %d for postcopy (%s)", | |
701 | i, strerror(errno)); | |
702 | return false; | |
703 | } | |
704 | /* TODO: Stash 'zero' support flags somewhere */ | |
705 | #endif | |
706 | } | |
707 | ||
708 | return true; | |
709 | } | |
710 | ||
ec94c8e6 RN |
711 | static bool |
712 | vu_add_mem_reg(VuDev *dev, VhostUserMsg *vmsg) { | |
713 | int i; | |
714 | bool track_ramblocks = dev->postcopy_listening; | |
715 | VhostUserMemoryRegion m = vmsg->payload.memreg.region, *msg_region = &m; | |
716 | VuDevRegion *dev_region = &dev->regions[dev->nregions]; | |
717 | void *mmap_addr; | |
718 | ||
9f4e6349 RN |
719 | if (vmsg->fd_num != 1) { |
720 | vmsg_close_fds(vmsg); | |
721 | vu_panic(dev, "VHOST_USER_ADD_MEM_REG received %d fds - only 1 fd " | |
722 | "should be sent for this message type", vmsg->fd_num); | |
723 | return false; | |
724 | } | |
725 | ||
726 | if (vmsg->size < VHOST_USER_MEM_REG_SIZE) { | |
727 | close(vmsg->fds[0]); | |
728 | vu_panic(dev, "VHOST_USER_ADD_MEM_REG requires a message size of at " | |
8541bf45 | 729 | "least %zu bytes and only %d bytes were received", |
9f4e6349 RN |
730 | VHOST_USER_MEM_REG_SIZE, vmsg->size); |
731 | return false; | |
732 | } | |
733 | ||
b906a23c RN |
734 | if (dev->nregions == VHOST_USER_MAX_RAM_SLOTS) { |
735 | close(vmsg->fds[0]); | |
736 | vu_panic(dev, "failing attempt to hot add memory via " | |
737 | "VHOST_USER_ADD_MEM_REG message because the backend has " | |
738 | "no free ram slots available"); | |
739 | return false; | |
740 | } | |
741 | ||
ec94c8e6 RN |
742 | /* |
743 | * If we are in postcopy mode and we receive a u64 payload with a 0 value | |
639b090d | 744 | * we know all the postcopy client bases have been received, and we |
ec94c8e6 RN |
745 | * should start generating faults. |
746 | */ | |
747 | if (track_ramblocks && | |
748 | vmsg->size == sizeof(vmsg->payload.u64) && | |
749 | vmsg->payload.u64 == 0) { | |
750 | (void)generate_faults(dev); | |
751 | return false; | |
752 | } | |
753 | ||
5fd6921c | 754 | DPRINT("Adding region: %u\n", dev->nregions); |
ec94c8e6 RN |
755 | DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n", |
756 | msg_region->guest_phys_addr); | |
757 | DPRINT(" memory_size: 0x%016"PRIx64"\n", | |
758 | msg_region->memory_size); | |
759 | DPRINT(" userspace_addr 0x%016"PRIx64"\n", | |
760 | msg_region->userspace_addr); | |
761 | DPRINT(" mmap_offset 0x%016"PRIx64"\n", | |
762 | msg_region->mmap_offset); | |
763 | ||
764 | dev_region->gpa = msg_region->guest_phys_addr; | |
765 | dev_region->size = msg_region->memory_size; | |
766 | dev_region->qva = msg_region->userspace_addr; | |
767 | dev_region->mmap_offset = msg_region->mmap_offset; | |
768 | ||
769 | /* | |
770 | * We don't use offset argument of mmap() since the | |
771 | * mapped address has to be page aligned, and we use huge | |
772 | * pages. | |
773 | */ | |
774 | if (track_ramblocks) { | |
775 | /* | |
776 | * In postcopy we're using PROT_NONE here to catch anyone | |
777 | * accessing it before we userfault. | |
778 | */ | |
779 | mmap_addr = mmap(0, dev_region->size + dev_region->mmap_offset, | |
eb99baa9 | 780 | PROT_NONE, MAP_SHARED | MAP_NORESERVE, |
ec94c8e6 RN |
781 | vmsg->fds[0], 0); |
782 | } else { | |
783 | mmap_addr = mmap(0, dev_region->size + dev_region->mmap_offset, | |
eb99baa9 DH |
784 | PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NORESERVE, |
785 | vmsg->fds[0], 0); | |
ec94c8e6 RN |
786 | } |
787 | ||
788 | if (mmap_addr == MAP_FAILED) { | |
789 | vu_panic(dev, "region mmap error: %s", strerror(errno)); | |
790 | } else { | |
791 | dev_region->mmap_addr = (uint64_t)(uintptr_t)mmap_addr; | |
792 | DPRINT(" mmap_addr: 0x%016"PRIx64"\n", | |
793 | dev_region->mmap_addr); | |
794 | } | |
795 | ||
796 | close(vmsg->fds[0]); | |
797 | ||
798 | if (track_ramblocks) { | |
799 | /* | |
800 | * Return the address to QEMU so that it can translate the ufd | |
801 | * fault addresses back. | |
802 | */ | |
803 | msg_region->userspace_addr = (uintptr_t)(mmap_addr + | |
804 | dev_region->mmap_offset); | |
805 | ||
806 | /* Send the message back to qemu with the addresses filled in. */ | |
807 | vmsg->fd_num = 0; | |
ec94c8e6 RN |
808 | DPRINT("Successfully added new region in postcopy\n"); |
809 | dev->nregions++; | |
7f27d20d | 810 | return true; |
ec94c8e6 RN |
811 | } else { |
812 | for (i = 0; i < dev->max_queues; i++) { | |
813 | if (dev->vq[i].vring.desc) { | |
814 | if (map_ring(dev, &dev->vq[i])) { | |
815 | vu_panic(dev, "remapping queue %d for new memory region", | |
816 | i); | |
817 | } | |
818 | } | |
819 | } | |
820 | ||
821 | DPRINT("Successfully added new region\n"); | |
822 | dev->nregions++; | |
5ebfdeb2 | 823 | return false; |
ec94c8e6 RN |
824 | } |
825 | } | |
826 | ||
875b9fd9 RN |
827 | static inline bool reg_equal(VuDevRegion *vudev_reg, |
828 | VhostUserMemoryRegion *msg_reg) | |
829 | { | |
830 | if (vudev_reg->gpa == msg_reg->guest_phys_addr && | |
831 | vudev_reg->qva == msg_reg->userspace_addr && | |
832 | vudev_reg->size == msg_reg->memory_size) { | |
833 | return true; | |
834 | } | |
835 | ||
836 | return false; | |
837 | } | |
838 | ||
839 | static bool | |
840 | vu_rem_mem_reg(VuDev *dev, VhostUserMsg *vmsg) { | |
875b9fd9 | 841 | VhostUserMemoryRegion m = vmsg->payload.memreg.region, *msg_region = &m; |
92bf2461 | 842 | unsigned int i; |
4fafedc9 | 843 | bool found = false; |
875b9fd9 | 844 | |
a81d8d4a | 845 | if (vmsg->fd_num > 1) { |
316ee111 | 846 | vmsg_close_fds(vmsg); |
a81d8d4a | 847 | vu_panic(dev, "VHOST_USER_REM_MEM_REG received %d fds - at most 1 fd " |
316ee111 RN |
848 | "should be sent for this message type", vmsg->fd_num); |
849 | return false; | |
850 | } | |
851 | ||
852 | if (vmsg->size < VHOST_USER_MEM_REG_SIZE) { | |
a81d8d4a | 853 | vmsg_close_fds(vmsg); |
316ee111 | 854 | vu_panic(dev, "VHOST_USER_REM_MEM_REG requires a message size of at " |
8541bf45 | 855 | "least %zu bytes and only %d bytes were received", |
316ee111 RN |
856 | VHOST_USER_MEM_REG_SIZE, vmsg->size); |
857 | return false; | |
858 | } | |
859 | ||
875b9fd9 RN |
860 | DPRINT("Removing region:\n"); |
861 | DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n", | |
862 | msg_region->guest_phys_addr); | |
863 | DPRINT(" memory_size: 0x%016"PRIx64"\n", | |
864 | msg_region->memory_size); | |
865 | DPRINT(" userspace_addr 0x%016"PRIx64"\n", | |
866 | msg_region->userspace_addr); | |
867 | DPRINT(" mmap_offset 0x%016"PRIx64"\n", | |
868 | msg_region->mmap_offset); | |
869 | ||
4fd5ca82 DH |
870 | for (i = 0; i < dev->nregions; i++) { |
871 | if (reg_equal(&dev->regions[i], msg_region)) { | |
875b9fd9 | 872 | VuDevRegion *r = &dev->regions[i]; |
61499d87 | 873 | void *ma = (void *) (uintptr_t) r->mmap_addr; |
875b9fd9 | 874 | |
61499d87 TH |
875 | if (ma) { |
876 | munmap(ma, r->size + r->mmap_offset); | |
875b9fd9 | 877 | } |
4fd5ca82 | 878 | |
4fafedc9 RN |
879 | /* |
880 | * Shift all affected entries by 1 to close the hole at index i and | |
881 | * zero out the last entry. | |
882 | */ | |
883 | memmove(dev->regions + i, dev->regions + i + 1, | |
884 | sizeof(VuDevRegion) * (dev->nregions - i - 1)); | |
885 | memset(dev->regions + dev->nregions - 1, 0, sizeof(VuDevRegion)); | |
886 | DPRINT("Successfully removed a region\n"); | |
887 | dev->nregions--; | |
888 | i--; | |
889 | ||
890 | found = true; | |
891 | ||
892 | /* Continue the search for eventual duplicates. */ | |
875b9fd9 RN |
893 | } |
894 | } | |
895 | ||
5ebfdeb2 | 896 | if (!found) { |
875b9fd9 RN |
897 | vu_panic(dev, "Specified region not found\n"); |
898 | } | |
899 | ||
a81d8d4a | 900 | vmsg_close_fds(vmsg); |
fa3d5483 | 901 | |
5ebfdeb2 | 902 | return false; |
875b9fd9 RN |
903 | } |
904 | ||
ce0f3b03 AE |
905 | static bool |
906 | vu_get_shared_object(VuDev *dev, VhostUserMsg *vmsg) | |
907 | { | |
908 | int fd_num = 0; | |
909 | int dmabuf_fd = -1; | |
910 | if (dev->iface->get_shared_object) { | |
911 | dmabuf_fd = dev->iface->get_shared_object( | |
912 | dev, &vmsg->payload.object.uuid[0]); | |
913 | } | |
914 | if (dmabuf_fd != -1) { | |
915 | DPRINT("dmabuf_fd found for requested UUID\n"); | |
916 | vmsg->fds[fd_num++] = dmabuf_fd; | |
917 | } | |
918 | vmsg->fd_num = fd_num; | |
919 | ||
920 | return true; | |
921 | } | |
922 | ||
55d754b3 DDAG |
923 | static bool |
924 | vu_set_mem_table_exec_postcopy(VuDev *dev, VhostUserMsg *vmsg) | |
925 | { | |
92bf2461 | 926 | unsigned int i; |
d288eef3 | 927 | VhostUserMemory m = vmsg->payload.memory, *memory = &m; |
55d754b3 | 928 | dev->nregions = memory->nregions; |
0185cfb3 | 929 | |
5fd6921c | 930 | DPRINT("Nregions: %u\n", memory->nregions); |
55d754b3 DDAG |
931 | for (i = 0; i < dev->nregions; i++) { |
932 | void *mmap_addr; | |
933 | VhostUserMemoryRegion *msg_region = &memory->regions[i]; | |
934 | VuDevRegion *dev_region = &dev->regions[i]; | |
935 | ||
936 | DPRINT("Region %d\n", i); | |
937 | DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n", | |
938 | msg_region->guest_phys_addr); | |
939 | DPRINT(" memory_size: 0x%016"PRIx64"\n", | |
940 | msg_region->memory_size); | |
941 | DPRINT(" userspace_addr 0x%016"PRIx64"\n", | |
942 | msg_region->userspace_addr); | |
943 | DPRINT(" mmap_offset 0x%016"PRIx64"\n", | |
944 | msg_region->mmap_offset); | |
945 | ||
946 | dev_region->gpa = msg_region->guest_phys_addr; | |
947 | dev_region->size = msg_region->memory_size; | |
948 | dev_region->qva = msg_region->userspace_addr; | |
949 | dev_region->mmap_offset = msg_region->mmap_offset; | |
950 | ||
951 | /* We don't use offset argument of mmap() since the | |
952 | * mapped address has to be page aligned, and we use huge | |
0185cfb3 DDAG |
953 | * pages. |
954 | * In postcopy we're using PROT_NONE here to catch anyone | |
955 | * accessing it before we userfault | |
956 | */ | |
55d754b3 | 957 | mmap_addr = mmap(0, dev_region->size + dev_region->mmap_offset, |
eb99baa9 | 958 | PROT_NONE, MAP_SHARED | MAP_NORESERVE, |
55d754b3 DDAG |
959 | vmsg->fds[i], 0); |
960 | ||
961 | if (mmap_addr == MAP_FAILED) { | |
962 | vu_panic(dev, "region mmap error: %s", strerror(errno)); | |
963 | } else { | |
964 | dev_region->mmap_addr = (uint64_t)(uintptr_t)mmap_addr; | |
965 | DPRINT(" mmap_addr: 0x%016"PRIx64"\n", | |
966 | dev_region->mmap_addr); | |
967 | } | |
968 | ||
9bb38019 DDAG |
969 | /* Return the address to QEMU so that it can translate the ufd |
970 | * fault addresses back. | |
971 | */ | |
972 | msg_region->userspace_addr = (uintptr_t)(mmap_addr + | |
973 | dev_region->mmap_offset); | |
55d754b3 DDAG |
974 | close(vmsg->fds[i]); |
975 | } | |
976 | ||
9bb38019 DDAG |
977 | /* Send the message back to qemu with the addresses filled in */ |
978 | vmsg->fd_num = 0; | |
d84599f5 | 979 | if (!vu_send_reply(dev, dev->sock, vmsg)) { |
9bb38019 DDAG |
980 | vu_panic(dev, "failed to respond to set-mem-table for postcopy"); |
981 | return false; | |
982 | } | |
983 | ||
984 | /* Wait for QEMU to confirm that it's registered the handler for the | |
985 | * faults. | |
986 | */ | |
049f5550 | 987 | if (!dev->read_msg(dev, dev->sock, vmsg) || |
9bb38019 DDAG |
988 | vmsg->size != sizeof(vmsg->payload.u64) || |
989 | vmsg->payload.u64 != 0) { | |
990 | vu_panic(dev, "failed to receive valid ack for postcopy set-mem-table"); | |
991 | return false; | |
992 | } | |
993 | ||
994 | /* OK, now we can go and register the memory and generate faults */ | |
08fccf8f | 995 | (void)generate_faults(dev); |
51a5d6e5 | 996 | |
55d754b3 DDAG |
997 | return false; |
998 | } | |
999 | ||
7b2e5c65 MAL |
1000 | static bool |
1001 | vu_set_mem_table_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1002 | { | |
92bf2461 | 1003 | unsigned int i; |
d288eef3 | 1004 | VhostUserMemory m = vmsg->payload.memory, *memory = &m; |
bb102d1d YX |
1005 | |
1006 | for (i = 0; i < dev->nregions; i++) { | |
1007 | VuDevRegion *r = &dev->regions[i]; | |
61499d87 | 1008 | void *ma = (void *) (uintptr_t) r->mmap_addr; |
bb102d1d | 1009 | |
61499d87 TH |
1010 | if (ma) { |
1011 | munmap(ma, r->size + r->mmap_offset); | |
bb102d1d YX |
1012 | } |
1013 | } | |
7b2e5c65 MAL |
1014 | dev->nregions = memory->nregions; |
1015 | ||
55d754b3 DDAG |
1016 | if (dev->postcopy_listening) { |
1017 | return vu_set_mem_table_exec_postcopy(dev, vmsg); | |
1018 | } | |
1019 | ||
5fd6921c | 1020 | DPRINT("Nregions: %u\n", memory->nregions); |
7b2e5c65 MAL |
1021 | for (i = 0; i < dev->nregions; i++) { |
1022 | void *mmap_addr; | |
1023 | VhostUserMemoryRegion *msg_region = &memory->regions[i]; | |
1024 | VuDevRegion *dev_region = &dev->regions[i]; | |
1025 | ||
1026 | DPRINT("Region %d\n", i); | |
1027 | DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n", | |
1028 | msg_region->guest_phys_addr); | |
1029 | DPRINT(" memory_size: 0x%016"PRIx64"\n", | |
1030 | msg_region->memory_size); | |
1031 | DPRINT(" userspace_addr 0x%016"PRIx64"\n", | |
1032 | msg_region->userspace_addr); | |
1033 | DPRINT(" mmap_offset 0x%016"PRIx64"\n", | |
1034 | msg_region->mmap_offset); | |
1035 | ||
1036 | dev_region->gpa = msg_region->guest_phys_addr; | |
1037 | dev_region->size = msg_region->memory_size; | |
1038 | dev_region->qva = msg_region->userspace_addr; | |
1039 | dev_region->mmap_offset = msg_region->mmap_offset; | |
1040 | ||
1041 | /* We don't use offset argument of mmap() since the | |
1042 | * mapped address has to be page aligned, and we use huge | |
1043 | * pages. */ | |
1044 | mmap_addr = mmap(0, dev_region->size + dev_region->mmap_offset, | |
eb99baa9 | 1045 | PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NORESERVE, |
7b2e5c65 MAL |
1046 | vmsg->fds[i], 0); |
1047 | ||
1048 | if (mmap_addr == MAP_FAILED) { | |
1049 | vu_panic(dev, "region mmap error: %s", strerror(errno)); | |
1050 | } else { | |
1051 | dev_region->mmap_addr = (uint64_t)(uintptr_t)mmap_addr; | |
1052 | DPRINT(" mmap_addr: 0x%016"PRIx64"\n", | |
1053 | dev_region->mmap_addr); | |
1054 | } | |
1055 | ||
1056 | close(vmsg->fds[i]); | |
1057 | } | |
1058 | ||
49e9ec74 DDAG |
1059 | for (i = 0; i < dev->max_queues; i++) { |
1060 | if (dev->vq[i].vring.desc) { | |
1061 | if (map_ring(dev, &dev->vq[i])) { | |
639b090d | 1062 | vu_panic(dev, "remapping queue %d during setmemtable", i); |
49e9ec74 DDAG |
1063 | } |
1064 | } | |
1065 | } | |
1066 | ||
7b2e5c65 MAL |
1067 | return false; |
1068 | } | |
1069 | ||
1070 | static bool | |
1071 | vu_set_log_base_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1072 | { | |
1073 | int fd; | |
1074 | uint64_t log_mmap_size, log_mmap_offset; | |
1075 | void *rc; | |
1076 | ||
1077 | if (vmsg->fd_num != 1 || | |
1078 | vmsg->size != sizeof(vmsg->payload.log)) { | |
1079 | vu_panic(dev, "Invalid log_base message"); | |
1080 | return true; | |
1081 | } | |
1082 | ||
1083 | fd = vmsg->fds[0]; | |
1084 | log_mmap_offset = vmsg->payload.log.mmap_offset; | |
1085 | log_mmap_size = vmsg->payload.log.mmap_size; | |
1086 | DPRINT("Log mmap_offset: %"PRId64"\n", log_mmap_offset); | |
1087 | DPRINT("Log mmap_size: %"PRId64"\n", log_mmap_size); | |
1088 | ||
1089 | rc = mmap(0, log_mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, | |
1090 | log_mmap_offset); | |
bb102d1d | 1091 | close(fd); |
7b2e5c65 MAL |
1092 | if (rc == MAP_FAILED) { |
1093 | perror("log mmap error"); | |
1094 | } | |
bb102d1d YX |
1095 | |
1096 | if (dev->log_table) { | |
1097 | munmap(dev->log_table, dev->log_size); | |
1098 | } | |
7b2e5c65 MAL |
1099 | dev->log_table = rc; |
1100 | dev->log_size = log_mmap_size; | |
1101 | ||
1102 | vmsg->size = sizeof(vmsg->payload.u64); | |
d6e47717 | 1103 | vmsg->fd_num = 0; |
7b2e5c65 MAL |
1104 | |
1105 | return true; | |
1106 | } | |
1107 | ||
1108 | static bool | |
1109 | vu_set_log_fd_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1110 | { | |
1111 | if (vmsg->fd_num != 1) { | |
1112 | vu_panic(dev, "Invalid log_fd message"); | |
1113 | return false; | |
1114 | } | |
1115 | ||
1116 | if (dev->log_call_fd != -1) { | |
1117 | close(dev->log_call_fd); | |
1118 | } | |
1119 | dev->log_call_fd = vmsg->fds[0]; | |
1120 | DPRINT("Got log_call_fd: %d\n", vmsg->fds[0]); | |
1121 | ||
1122 | return false; | |
1123 | } | |
1124 | ||
1125 | static bool | |
1126 | vu_set_vring_num_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1127 | { | |
1128 | unsigned int index = vmsg->payload.state.index; | |
1129 | unsigned int num = vmsg->payload.state.num; | |
1130 | ||
5fd6921c AC |
1131 | DPRINT("State.index: %u\n", index); |
1132 | DPRINT("State.num: %u\n", num); | |
7b2e5c65 MAL |
1133 | dev->vq[index].vring.num = num; |
1134 | ||
1135 | return false; | |
1136 | } | |
1137 | ||
1138 | static bool | |
1139 | vu_set_vring_addr_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1140 | { | |
d288eef3 | 1141 | struct vhost_vring_addr addr = vmsg->payload.addr, *vra = &addr; |
7b2e5c65 MAL |
1142 | unsigned int index = vra->index; |
1143 | VuVirtq *vq = &dev->vq[index]; | |
1144 | ||
1145 | DPRINT("vhost_vring_addr:\n"); | |
1146 | DPRINT(" index: %d\n", vra->index); | |
1147 | DPRINT(" flags: %d\n", vra->flags); | |
4fe29344 MAL |
1148 | DPRINT(" desc_user_addr: 0x%016" PRIx64 "\n", (uint64_t)vra->desc_user_addr); |
1149 | DPRINT(" used_user_addr: 0x%016" PRIx64 "\n", (uint64_t)vra->used_user_addr); | |
1150 | DPRINT(" avail_user_addr: 0x%016" PRIx64 "\n", (uint64_t)vra->avail_user_addr); | |
1151 | DPRINT(" log_guest_addr: 0x%016" PRIx64 "\n", (uint64_t)vra->log_guest_addr); | |
7b2e5c65 | 1152 | |
49e9ec74 | 1153 | vq->vra = *vra; |
7b2e5c65 | 1154 | vq->vring.flags = vra->flags; |
7b2e5c65 MAL |
1155 | vq->vring.log_guest_addr = vra->log_guest_addr; |
1156 | ||
7b2e5c65 | 1157 | |
49e9ec74 | 1158 | if (map_ring(dev, vq)) { |
7b2e5c65 MAL |
1159 | vu_panic(dev, "Invalid vring_addr message"); |
1160 | return false; | |
1161 | } | |
1162 | ||
0ca29315 | 1163 | vq->used_idx = le16toh(vq->vring.used->idx); |
7b2e5c65 | 1164 | |
35480cbf MAL |
1165 | if (vq->last_avail_idx != vq->used_idx) { |
1166 | bool resume = dev->iface->queue_is_processed_in_order && | |
1167 | dev->iface->queue_is_processed_in_order(dev, index); | |
1168 | ||
1169 | DPRINT("Last avail index != used index: %u != %u%s\n", | |
1170 | vq->last_avail_idx, vq->used_idx, | |
1171 | resume ? ", resuming" : ""); | |
1172 | ||
1173 | if (resume) { | |
1174 | vq->shadow_avail_idx = vq->last_avail_idx = vq->used_idx; | |
1175 | } | |
1176 | } | |
1177 | ||
7b2e5c65 MAL |
1178 | return false; |
1179 | } | |
1180 | ||
1181 | static bool | |
1182 | vu_set_vring_base_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1183 | { | |
1184 | unsigned int index = vmsg->payload.state.index; | |
1185 | unsigned int num = vmsg->payload.state.num; | |
1186 | ||
5fd6921c AC |
1187 | DPRINT("State.index: %u\n", index); |
1188 | DPRINT("State.num: %u\n", num); | |
7b2e5c65 MAL |
1189 | dev->vq[index].shadow_avail_idx = dev->vq[index].last_avail_idx = num; |
1190 | ||
1191 | return false; | |
1192 | } | |
1193 | ||
1194 | static bool | |
1195 | vu_get_vring_base_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1196 | { | |
1197 | unsigned int index = vmsg->payload.state.index; | |
1198 | ||
5fd6921c | 1199 | DPRINT("State.index: %u\n", index); |
7b2e5c65 MAL |
1200 | vmsg->payload.state.num = dev->vq[index].last_avail_idx; |
1201 | vmsg->size = sizeof(vmsg->payload.state); | |
1202 | ||
1203 | dev->vq[index].started = false; | |
1204 | if (dev->iface->queue_set_started) { | |
1205 | dev->iface->queue_set_started(dev, index, false); | |
1206 | } | |
1207 | ||
1208 | if (dev->vq[index].call_fd != -1) { | |
1209 | close(dev->vq[index].call_fd); | |
1210 | dev->vq[index].call_fd = -1; | |
1211 | } | |
1212 | if (dev->vq[index].kick_fd != -1) { | |
1213 | dev->remove_watch(dev, dev->vq[index].kick_fd); | |
1214 | close(dev->vq[index].kick_fd); | |
1215 | dev->vq[index].kick_fd = -1; | |
1216 | } | |
1217 | ||
1218 | return true; | |
1219 | } | |
1220 | ||
1221 | static bool | |
1222 | vu_check_queue_msg_file(VuDev *dev, VhostUserMsg *vmsg) | |
1223 | { | |
1224 | int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; | |
d5f99fc5 | 1225 | bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; |
7b2e5c65 | 1226 | |
6f5fd837 | 1227 | if (index >= dev->max_queues) { |
7b2e5c65 MAL |
1228 | vmsg_close_fds(vmsg); |
1229 | vu_panic(dev, "Invalid queue index: %u", index); | |
1230 | return false; | |
1231 | } | |
1232 | ||
d5f99fc5 JB |
1233 | if (nofd) { |
1234 | vmsg_close_fds(vmsg); | |
1235 | return true; | |
1236 | } | |
1237 | ||
1238 | if (vmsg->fd_num != 1) { | |
7b2e5c65 MAL |
1239 | vmsg_close_fds(vmsg); |
1240 | vu_panic(dev, "Invalid fds in request: %d", vmsg->request); | |
1241 | return false; | |
1242 | } | |
1243 | ||
1244 | return true; | |
1245 | } | |
1246 | ||
5f9ff1ef XY |
1247 | static int |
1248 | inflight_desc_compare(const void *a, const void *b) | |
1249 | { | |
1250 | VuVirtqInflightDesc *desc0 = (VuVirtqInflightDesc *)a, | |
1251 | *desc1 = (VuVirtqInflightDesc *)b; | |
1252 | ||
1253 | if (desc1->counter > desc0->counter && | |
1254 | (desc1->counter - desc0->counter) < VIRTQUEUE_MAX_SIZE * 2) { | |
1255 | return 1; | |
1256 | } | |
1257 | ||
1258 | return -1; | |
1259 | } | |
1260 | ||
1261 | static int | |
1262 | vu_check_queue_inflights(VuDev *dev, VuVirtq *vq) | |
1263 | { | |
1264 | int i = 0; | |
1265 | ||
eeb39263 | 1266 | if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) { |
5f9ff1ef XY |
1267 | return 0; |
1268 | } | |
1269 | ||
1270 | if (unlikely(!vq->inflight)) { | |
1271 | return -1; | |
1272 | } | |
1273 | ||
1274 | if (unlikely(!vq->inflight->version)) { | |
1275 | /* initialize the buffer */ | |
1276 | vq->inflight->version = INFLIGHT_VERSION; | |
1277 | return 0; | |
1278 | } | |
1279 | ||
0ca29315 | 1280 | vq->used_idx = le16toh(vq->vring.used->idx); |
5f9ff1ef XY |
1281 | vq->resubmit_num = 0; |
1282 | vq->resubmit_list = NULL; | |
1283 | vq->counter = 0; | |
1284 | ||
1285 | if (unlikely(vq->inflight->used_idx != vq->used_idx)) { | |
1286 | vq->inflight->desc[vq->inflight->last_batch_head].inflight = 0; | |
1287 | ||
1288 | barrier(); | |
1289 | ||
1290 | vq->inflight->used_idx = vq->used_idx; | |
1291 | } | |
1292 | ||
1293 | for (i = 0; i < vq->inflight->desc_num; i++) { | |
1294 | if (vq->inflight->desc[i].inflight == 1) { | |
1295 | vq->inuse++; | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | vq->shadow_avail_idx = vq->last_avail_idx = vq->inuse + vq->used_idx; | |
1300 | ||
1301 | if (vq->inuse) { | |
d9b3ade5 | 1302 | vq->resubmit_list = calloc(vq->inuse, sizeof(VuVirtqInflightDesc)); |
5f9ff1ef XY |
1303 | if (!vq->resubmit_list) { |
1304 | return -1; | |
1305 | } | |
1306 | ||
1307 | for (i = 0; i < vq->inflight->desc_num; i++) { | |
1308 | if (vq->inflight->desc[i].inflight) { | |
1309 | vq->resubmit_list[vq->resubmit_num].index = i; | |
1310 | vq->resubmit_list[vq->resubmit_num].counter = | |
1311 | vq->inflight->desc[i].counter; | |
1312 | vq->resubmit_num++; | |
1313 | } | |
1314 | } | |
1315 | ||
1316 | if (vq->resubmit_num > 1) { | |
1317 | qsort(vq->resubmit_list, vq->resubmit_num, | |
1318 | sizeof(VuVirtqInflightDesc), inflight_desc_compare); | |
1319 | } | |
1320 | vq->counter = vq->resubmit_list[0].counter + 1; | |
1321 | } | |
1322 | ||
1323 | /* in case of I/O hang after reconnecting */ | |
1324 | if (eventfd_write(vq->kick_fd, 1)) { | |
1325 | return -1; | |
1326 | } | |
1327 | ||
1328 | return 0; | |
1329 | } | |
1330 | ||
7b2e5c65 MAL |
1331 | static bool |
1332 | vu_set_vring_kick_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1333 | { | |
1334 | int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; | |
d5f99fc5 | 1335 | bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; |
7b2e5c65 MAL |
1336 | |
1337 | DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); | |
1338 | ||
1339 | if (!vu_check_queue_msg_file(dev, vmsg)) { | |
1340 | return false; | |
1341 | } | |
1342 | ||
1343 | if (dev->vq[index].kick_fd != -1) { | |
1344 | dev->remove_watch(dev, dev->vq[index].kick_fd); | |
1345 | close(dev->vq[index].kick_fd); | |
1346 | dev->vq[index].kick_fd = -1; | |
1347 | } | |
1348 | ||
d5f99fc5 JB |
1349 | dev->vq[index].kick_fd = nofd ? -1 : vmsg->fds[0]; |
1350 | DPRINT("Got kick_fd: %d for vq: %d\n", dev->vq[index].kick_fd, index); | |
7b2e5c65 MAL |
1351 | |
1352 | dev->vq[index].started = true; | |
1353 | if (dev->iface->queue_set_started) { | |
1354 | dev->iface->queue_set_started(dev, index, true); | |
1355 | } | |
1356 | ||
1357 | if (dev->vq[index].kick_fd != -1 && dev->vq[index].handler) { | |
1358 | dev->set_watch(dev, dev->vq[index].kick_fd, VU_WATCH_IN, | |
1359 | vu_kick_cb, (void *)(long)index); | |
1360 | ||
1361 | DPRINT("Waiting for kicks on fd: %d for vq: %d\n", | |
1362 | dev->vq[index].kick_fd, index); | |
1363 | } | |
1364 | ||
5f9ff1ef XY |
1365 | if (vu_check_queue_inflights(dev, &dev->vq[index])) { |
1366 | vu_panic(dev, "Failed to check inflights for vq: %d\n", index); | |
1367 | } | |
1368 | ||
7b2e5c65 MAL |
1369 | return false; |
1370 | } | |
1371 | ||
1372 | void vu_set_queue_handler(VuDev *dev, VuVirtq *vq, | |
1373 | vu_queue_handler_cb handler) | |
1374 | { | |
1375 | int qidx = vq - dev->vq; | |
1376 | ||
1377 | vq->handler = handler; | |
1378 | if (vq->kick_fd >= 0) { | |
1379 | if (handler) { | |
1380 | dev->set_watch(dev, vq->kick_fd, VU_WATCH_IN, | |
1381 | vu_kick_cb, (void *)(long)qidx); | |
1382 | } else { | |
1383 | dev->remove_watch(dev, vq->kick_fd); | |
1384 | } | |
1385 | } | |
1386 | } | |
1387 | ||
d84599f5 TB |
1388 | bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd, |
1389 | int size, int offset) | |
1390 | { | |
1391 | int qidx = vq - dev->vq; | |
1392 | int fd_num = 0; | |
1393 | VhostUserMsg vmsg = { | |
e608feed | 1394 | .request = VHOST_USER_BACKEND_VRING_HOST_NOTIFIER_MSG, |
d84599f5 TB |
1395 | .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK, |
1396 | .size = sizeof(vmsg.payload.area), | |
1397 | .payload.area = { | |
1398 | .u64 = qidx & VHOST_USER_VRING_IDX_MASK, | |
1399 | .size = size, | |
1400 | .offset = offset, | |
1401 | }, | |
1402 | }; | |
1403 | ||
1404 | if (fd == -1) { | |
1405 | vmsg.payload.area.u64 |= VHOST_USER_VRING_NOFD_MASK; | |
1406 | } else { | |
1407 | vmsg.fds[fd_num++] = fd; | |
1408 | } | |
1409 | ||
1410 | vmsg.fd_num = fd_num; | |
1411 | ||
e608feed | 1412 | if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_BACKEND_SEND_FD)) { |
d84599f5 TB |
1413 | return false; |
1414 | } | |
1415 | ||
f8ed3648 MP |
1416 | pthread_mutex_lock(&dev->backend_mutex); |
1417 | if (!vu_message_write(dev, dev->backend_fd, &vmsg)) { | |
1418 | pthread_mutex_unlock(&dev->backend_mutex); | |
d84599f5 TB |
1419 | return false; |
1420 | } | |
1421 | ||
f8ed3648 | 1422 | /* Also unlocks the backend_mutex */ |
d84599f5 TB |
1423 | return vu_process_message_reply(dev, &vmsg); |
1424 | } | |
1425 | ||
ce0f3b03 AE |
1426 | bool |
1427 | vu_lookup_shared_object(VuDev *dev, unsigned char uuid[UUID_LEN], | |
1428 | int *dmabuf_fd) | |
1429 | { | |
1430 | bool result = false; | |
1431 | VhostUserMsg msg_reply; | |
1432 | VhostUserMsg msg = { | |
1433 | .request = VHOST_USER_BACKEND_SHARED_OBJECT_LOOKUP, | |
1434 | .size = sizeof(msg.payload.object), | |
1435 | .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK, | |
1436 | }; | |
1437 | ||
1438 | memcpy(msg.payload.object.uuid, uuid, sizeof(uuid[0]) * UUID_LEN); | |
1439 | ||
1440 | if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_SHARED_OBJECT)) { | |
1441 | return false; | |
1442 | } | |
1443 | ||
1444 | pthread_mutex_lock(&dev->backend_mutex); | |
1445 | if (!vu_message_write(dev, dev->backend_fd, &msg)) { | |
1446 | goto out; | |
1447 | } | |
1448 | ||
1449 | if (!vu_message_read_default(dev, dev->backend_fd, &msg_reply)) { | |
1450 | goto out; | |
1451 | } | |
1452 | ||
1453 | if (msg_reply.request != msg.request) { | |
1454 | DPRINT("Received unexpected msg type. Expected %d, received %d", | |
1455 | msg.request, msg_reply.request); | |
1456 | goto out; | |
1457 | } | |
1458 | ||
1459 | if (msg_reply.fd_num != 1) { | |
1460 | DPRINT("Received unexpected number of fds. Expected 1, received %d", | |
1461 | msg_reply.fd_num); | |
1462 | goto out; | |
1463 | } | |
1464 | ||
1465 | *dmabuf_fd = msg_reply.fds[0]; | |
1466 | result = *dmabuf_fd > 0 && msg_reply.payload.u64 == 0; | |
1467 | out: | |
1468 | pthread_mutex_unlock(&dev->backend_mutex); | |
1469 | ||
1470 | return result; | |
1471 | } | |
1472 | ||
1473 | static bool | |
1474 | vu_send_message(VuDev *dev, VhostUserMsg *vmsg) | |
1475 | { | |
1476 | bool result = false; | |
1477 | pthread_mutex_lock(&dev->backend_mutex); | |
1478 | if (!vu_message_write(dev, dev->backend_fd, vmsg)) { | |
1479 | goto out; | |
1480 | } | |
1481 | ||
1482 | result = true; | |
1483 | out: | |
1484 | pthread_mutex_unlock(&dev->backend_mutex); | |
1485 | ||
1486 | return result; | |
1487 | } | |
1488 | ||
1489 | bool | |
1490 | vu_add_shared_object(VuDev *dev, unsigned char uuid[UUID_LEN]) | |
1491 | { | |
1492 | VhostUserMsg msg = { | |
1493 | .request = VHOST_USER_BACKEND_SHARED_OBJECT_ADD, | |
1494 | .size = sizeof(msg.payload.object), | |
1495 | .flags = VHOST_USER_VERSION, | |
1496 | }; | |
1497 | ||
1498 | memcpy(msg.payload.object.uuid, uuid, sizeof(uuid[0]) * UUID_LEN); | |
1499 | ||
1500 | if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_SHARED_OBJECT)) { | |
1501 | return false; | |
1502 | } | |
1503 | ||
1504 | return vu_send_message(dev, &msg); | |
1505 | } | |
1506 | ||
1507 | bool | |
1508 | vu_rm_shared_object(VuDev *dev, unsigned char uuid[UUID_LEN]) | |
1509 | { | |
1510 | VhostUserMsg msg = { | |
1511 | .request = VHOST_USER_BACKEND_SHARED_OBJECT_REMOVE, | |
1512 | .size = sizeof(msg.payload.object), | |
1513 | .flags = VHOST_USER_VERSION, | |
1514 | }; | |
1515 | ||
1516 | memcpy(msg.payload.object.uuid, uuid, sizeof(uuid[0]) * UUID_LEN); | |
1517 | ||
1518 | if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_SHARED_OBJECT)) { | |
1519 | return false; | |
1520 | } | |
1521 | ||
1522 | return vu_send_message(dev, &msg); | |
1523 | } | |
1524 | ||
7b2e5c65 MAL |
1525 | static bool |
1526 | vu_set_vring_call_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1527 | { | |
1528 | int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; | |
d5f99fc5 | 1529 | bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; |
7b2e5c65 MAL |
1530 | |
1531 | DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); | |
1532 | ||
1533 | if (!vu_check_queue_msg_file(dev, vmsg)) { | |
1534 | return false; | |
1535 | } | |
1536 | ||
1537 | if (dev->vq[index].call_fd != -1) { | |
1538 | close(dev->vq[index].call_fd); | |
1539 | dev->vq[index].call_fd = -1; | |
1540 | } | |
1541 | ||
d5f99fc5 | 1542 | dev->vq[index].call_fd = nofd ? -1 : vmsg->fds[0]; |
7b2e5c65 | 1543 | |
5f9ff1ef | 1544 | /* in case of I/O hang after reconnecting */ |
d5f99fc5 | 1545 | if (dev->vq[index].call_fd != -1 && eventfd_write(vmsg->fds[0], 1)) { |
5f9ff1ef XY |
1546 | return -1; |
1547 | } | |
1548 | ||
d5f99fc5 | 1549 | DPRINT("Got call_fd: %d for vq: %d\n", dev->vq[index].call_fd, index); |
7b2e5c65 MAL |
1550 | |
1551 | return false; | |
1552 | } | |
1553 | ||
1554 | static bool | |
1555 | vu_set_vring_err_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1556 | { | |
1557 | int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; | |
d5f99fc5 | 1558 | bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; |
7b2e5c65 MAL |
1559 | |
1560 | DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); | |
1561 | ||
1562 | if (!vu_check_queue_msg_file(dev, vmsg)) { | |
1563 | return false; | |
1564 | } | |
1565 | ||
1566 | if (dev->vq[index].err_fd != -1) { | |
1567 | close(dev->vq[index].err_fd); | |
1568 | dev->vq[index].err_fd = -1; | |
1569 | } | |
1570 | ||
d5f99fc5 | 1571 | dev->vq[index].err_fd = nofd ? -1 : vmsg->fds[0]; |
7b2e5c65 MAL |
1572 | |
1573 | return false; | |
1574 | } | |
1575 | ||
1576 | static bool | |
1577 | vu_get_protocol_features_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1578 | { | |
ff132005 JB |
1579 | /* |
1580 | * Note that we support, but intentionally do not set, | |
1581 | * VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS. This means that | |
1582 | * a device implementation can return it in its callback | |
1583 | * (get_protocol_features) if it wants to use this for | |
1584 | * simulation, but it is otherwise not desirable (if even | |
f8ed3648 | 1585 | * implemented by the frontend.) |
ff132005 | 1586 | */ |
ea1b802c SH |
1587 | uint64_t features = 1ULL << VHOST_USER_PROTOCOL_F_MQ | |
1588 | 1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD | | |
e608feed | 1589 | 1ULL << VHOST_USER_PROTOCOL_F_BACKEND_REQ | |
d84599f5 | 1590 | 1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER | |
e608feed | 1591 | 1ULL << VHOST_USER_PROTOCOL_F_BACKEND_SEND_FD | |
b650d5f4 RN |
1592 | 1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK | |
1593 | 1ULL << VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS; | |
7b2e5c65 | 1594 | |
4275cd99 DDAG |
1595 | if (have_userfault()) { |
1596 | features |= 1ULL << VHOST_USER_PROTOCOL_F_PAGEFAULT; | |
1597 | } | |
1598 | ||
78067fde MAL |
1599 | if (dev->iface->get_config && dev->iface->set_config) { |
1600 | features |= 1ULL << VHOST_USER_PROTOCOL_F_CONFIG; | |
1601 | } | |
1602 | ||
7b2e5c65 MAL |
1603 | if (dev->iface->get_protocol_features) { |
1604 | features |= dev->iface->get_protocol_features(dev); | |
1605 | } | |
1606 | ||
db68f4ff | 1607 | vmsg_set_reply_u64(vmsg, features); |
7b2e5c65 MAL |
1608 | return true; |
1609 | } | |
1610 | ||
1611 | static bool | |
1612 | vu_set_protocol_features_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1613 | { | |
1614 | uint64_t features = vmsg->payload.u64; | |
1615 | ||
1616 | DPRINT("u64: 0x%016"PRIx64"\n", features); | |
1617 | ||
1618 | dev->protocol_features = vmsg->payload.u64; | |
1619 | ||
ff132005 JB |
1620 | if (vu_has_protocol_feature(dev, |
1621 | VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS) && | |
e608feed | 1622 | (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_BACKEND_REQ) || |
ff132005 JB |
1623 | !vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_REPLY_ACK))) { |
1624 | /* | |
1625 | * The use case for using messages for kick/call is simulation, to make | |
1626 | * the kick and call synchronous. To actually get that behaviour, both | |
1627 | * of the other features are required. | |
1628 | * Theoretically, one could use only kick messages, or do them without | |
1629 | * having F_REPLY_ACK, but too many (possibly pending) messages on the | |
f8ed3648 | 1630 | * socket will eventually cause the frontend to hang, to avoid this in |
ff132005 JB |
1631 | * scenarios where not desired enforce that the settings are in a way |
1632 | * that actually enables the simulation case. | |
1633 | */ | |
1634 | vu_panic(dev, | |
e608feed | 1635 | "F_IN_BAND_NOTIFICATIONS requires F_BACKEND_REQ && F_REPLY_ACK"); |
ff132005 JB |
1636 | return false; |
1637 | } | |
1638 | ||
7b2e5c65 MAL |
1639 | if (dev->iface->set_protocol_features) { |
1640 | dev->iface->set_protocol_features(dev, features); | |
1641 | } | |
1642 | ||
1643 | return false; | |
1644 | } | |
1645 | ||
1646 | static bool | |
1647 | vu_get_queue_num_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1648 | { | |
ea1b802c SH |
1649 | vmsg_set_reply_u64(vmsg, dev->max_queues); |
1650 | return true; | |
7b2e5c65 MAL |
1651 | } |
1652 | ||
1653 | static bool | |
1654 | vu_set_vring_enable_exec(VuDev *dev, VhostUserMsg *vmsg) | |
1655 | { | |
1656 | unsigned int index = vmsg->payload.state.index; | |
1657 | unsigned int enable = vmsg->payload.state.num; | |
1658 | ||
5fd6921c AC |
1659 | DPRINT("State.index: %u\n", index); |
1660 | DPRINT("State.enable: %u\n", enable); | |
7b2e5c65 | 1661 | |
6f5fd837 | 1662 | if (index >= dev->max_queues) { |
7b2e5c65 MAL |
1663 | vu_panic(dev, "Invalid vring_enable index: %u", index); |
1664 | return false; | |
1665 | } | |
1666 | ||
1667 | dev->vq[index].enable = enable; | |
1668 | return false; | |
1669 | } | |
1670 | ||
13384f15 | 1671 | static bool |
f8ed3648 | 1672 | vu_set_backend_req_fd(VuDev *dev, VhostUserMsg *vmsg) |
13384f15 DDAG |
1673 | { |
1674 | if (vmsg->fd_num != 1) { | |
f8ed3648 | 1675 | vu_panic(dev, "Invalid backend_req_fd message (%d fd's)", vmsg->fd_num); |
13384f15 DDAG |
1676 | return false; |
1677 | } | |
1678 | ||
f8ed3648 MP |
1679 | if (dev->backend_fd != -1) { |
1680 | close(dev->backend_fd); | |
13384f15 | 1681 | } |
f8ed3648 MP |
1682 | dev->backend_fd = vmsg->fds[0]; |
1683 | DPRINT("Got backend_fd: %d\n", vmsg->fds[0]); | |
13384f15 DDAG |
1684 | |
1685 | return false; | |
1686 | } | |
1687 | ||
0bc24d83 CL |
1688 | static bool |
1689 | vu_get_config(VuDev *dev, VhostUserMsg *vmsg) | |
1690 | { | |
1691 | int ret = -1; | |
1692 | ||
1693 | if (dev->iface->get_config) { | |
1694 | ret = dev->iface->get_config(dev, vmsg->payload.config.region, | |
1695 | vmsg->payload.config.size); | |
1696 | } | |
1697 | ||
1698 | if (ret) { | |
f8ed3648 | 1699 | /* resize to zero to indicate an error to frontend */ |
0bc24d83 CL |
1700 | vmsg->size = 0; |
1701 | } | |
1702 | ||
1703 | return true; | |
1704 | } | |
1705 | ||
1706 | static bool | |
1707 | vu_set_config(VuDev *dev, VhostUserMsg *vmsg) | |
1708 | { | |
1709 | int ret = -1; | |
1710 | ||
1711 | if (dev->iface->set_config) { | |
1712 | ret = dev->iface->set_config(dev, vmsg->payload.config.region, | |
1713 | vmsg->payload.config.offset, | |
1714 | vmsg->payload.config.size, | |
1715 | vmsg->payload.config.flags); | |
1716 | if (ret) { | |
1717 | vu_panic(dev, "Set virtio configuration space failed"); | |
1718 | } | |
1719 | } | |
1720 | ||
1721 | return false; | |
1722 | } | |
1723 | ||
d3dff7a5 DDAG |
1724 | static bool |
1725 | vu_set_postcopy_advise(VuDev *dev, VhostUserMsg *vmsg) | |
1726 | { | |
2a84ffc0 DDAG |
1727 | #ifdef UFFDIO_API |
1728 | struct uffdio_api api_struct; | |
1729 | ||
1730 | dev->postcopy_ufd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK); | |
d3dff7a5 | 1731 | vmsg->size = 0; |
f1c563d2 MH |
1732 | #else |
1733 | dev->postcopy_ufd = -1; | |
2a84ffc0 DDAG |
1734 | #endif |
1735 | ||
1736 | if (dev->postcopy_ufd == -1) { | |
1737 | vu_panic(dev, "Userfaultfd not available: %s", strerror(errno)); | |
1738 | goto out; | |
1739 | } | |
1740 | ||
1741 | #ifdef UFFDIO_API | |
1742 | api_struct.api = UFFD_API; | |
1743 | api_struct.features = 0; | |
1744 | if (ioctl(dev->postcopy_ufd, UFFDIO_API, &api_struct)) { | |
1745 | vu_panic(dev, "Failed UFFDIO_API: %s", strerror(errno)); | |
1746 | close(dev->postcopy_ufd); | |
1747 | dev->postcopy_ufd = -1; | |
1748 | goto out; | |
1749 | } | |
1750 | /* TODO: Stash feature flags somewhere */ | |
1751 | #endif | |
1752 | ||
1753 | out: | |
1754 | /* Return a ufd to the QEMU */ | |
1755 | vmsg->fd_num = 1; | |
1756 | vmsg->fds[0] = dev->postcopy_ufd; | |
d3dff7a5 DDAG |
1757 | return true; /* = send a reply */ |
1758 | } | |
1759 | ||
6864a7b5 DDAG |
1760 | static bool |
1761 | vu_set_postcopy_listen(VuDev *dev, VhostUserMsg *vmsg) | |
1762 | { | |
6864a7b5 DDAG |
1763 | if (dev->nregions) { |
1764 | vu_panic(dev, "Regions already registered at postcopy-listen"); | |
db68f4ff | 1765 | vmsg_set_reply_u64(vmsg, -1); |
6864a7b5 DDAG |
1766 | return true; |
1767 | } | |
1768 | dev->postcopy_listening = true; | |
1769 | ||
db68f4ff | 1770 | vmsg_set_reply_u64(vmsg, 0); |
6864a7b5 DDAG |
1771 | return true; |
1772 | } | |
c639187e DDAG |
1773 | |
1774 | static bool | |
1775 | vu_set_postcopy_end(VuDev *dev, VhostUserMsg *vmsg) | |
1776 | { | |
1777 | DPRINT("%s: Entry\n", __func__); | |
1778 | dev->postcopy_listening = false; | |
1779 | if (dev->postcopy_ufd > 0) { | |
1780 | close(dev->postcopy_ufd); | |
1781 | dev->postcopy_ufd = -1; | |
1782 | DPRINT("%s: Done close\n", __func__); | |
1783 | } | |
1784 | ||
db68f4ff | 1785 | vmsg_set_reply_u64(vmsg, 0); |
c639187e DDAG |
1786 | DPRINT("%s: exit\n", __func__); |
1787 | return true; | |
1788 | } | |
1789 | ||
5f9ff1ef XY |
1790 | static inline uint64_t |
1791 | vu_inflight_queue_size(uint16_t queue_size) | |
1792 | { | |
1793 | return ALIGN_UP(sizeof(VuDescStateSplit) * queue_size + | |
1794 | sizeof(uint16_t), INFLIGHT_ALIGNMENT); | |
1795 | } | |
1796 | ||
810033be MAL |
1797 | #ifdef MFD_ALLOW_SEALING |
1798 | static void * | |
1799 | memfd_alloc(const char *name, size_t size, unsigned int flags, int *fd) | |
1800 | { | |
1801 | void *ptr; | |
1802 | int ret; | |
1803 | ||
1804 | *fd = memfd_create(name, MFD_ALLOW_SEALING); | |
1805 | if (*fd < 0) { | |
1806 | return NULL; | |
1807 | } | |
1808 | ||
1809 | ret = ftruncate(*fd, size); | |
1810 | if (ret < 0) { | |
1811 | close(*fd); | |
1812 | return NULL; | |
1813 | } | |
1814 | ||
1815 | ret = fcntl(*fd, F_ADD_SEALS, flags); | |
1816 | if (ret < 0) { | |
1817 | close(*fd); | |
1818 | return NULL; | |
1819 | } | |
1820 | ||
1821 | ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, *fd, 0); | |
1822 | if (ptr == MAP_FAILED) { | |
1823 | close(*fd); | |
1824 | return NULL; | |
1825 | } | |
1826 | ||
1827 | return ptr; | |
1828 | } | |
1829 | #endif | |
1830 | ||
5f9ff1ef XY |
1831 | static bool |
1832 | vu_get_inflight_fd(VuDev *dev, VhostUserMsg *vmsg) | |
1833 | { | |
810033be MAL |
1834 | int fd = -1; |
1835 | void *addr = NULL; | |
5f9ff1ef XY |
1836 | uint64_t mmap_size; |
1837 | uint16_t num_queues, queue_size; | |
1838 | ||
1839 | if (vmsg->size != sizeof(vmsg->payload.inflight)) { | |
1840 | vu_panic(dev, "Invalid get_inflight_fd message:%d", vmsg->size); | |
1841 | vmsg->payload.inflight.mmap_size = 0; | |
1842 | return true; | |
1843 | } | |
1844 | ||
1845 | num_queues = vmsg->payload.inflight.num_queues; | |
1846 | queue_size = vmsg->payload.inflight.queue_size; | |
1847 | ||
1848 | DPRINT("set_inflight_fd num_queues: %"PRId16"\n", num_queues); | |
1849 | DPRINT("set_inflight_fd queue_size: %"PRId16"\n", queue_size); | |
1850 | ||
1851 | mmap_size = vu_inflight_queue_size(queue_size) * num_queues; | |
1852 | ||
810033be MAL |
1853 | #ifdef MFD_ALLOW_SEALING |
1854 | addr = memfd_alloc("vhost-inflight", mmap_size, | |
1855 | F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL, | |
1856 | &fd); | |
1857 | #else | |
1858 | vu_panic(dev, "Not implemented: memfd support is missing"); | |
1859 | #endif | |
5f9ff1ef XY |
1860 | |
1861 | if (!addr) { | |
1862 | vu_panic(dev, "Failed to alloc vhost inflight area"); | |
1863 | vmsg->payload.inflight.mmap_size = 0; | |
1864 | return true; | |
1865 | } | |
1866 | ||
1867 | memset(addr, 0, mmap_size); | |
1868 | ||
1869 | dev->inflight_info.addr = addr; | |
1870 | dev->inflight_info.size = vmsg->payload.inflight.mmap_size = mmap_size; | |
1871 | dev->inflight_info.fd = vmsg->fds[0] = fd; | |
1872 | vmsg->fd_num = 1; | |
1873 | vmsg->payload.inflight.mmap_offset = 0; | |
1874 | ||
1875 | DPRINT("send inflight mmap_size: %"PRId64"\n", | |
1876 | vmsg->payload.inflight.mmap_size); | |
1877 | DPRINT("send inflight mmap offset: %"PRId64"\n", | |
1878 | vmsg->payload.inflight.mmap_offset); | |
1879 | ||
1880 | return true; | |
1881 | } | |
1882 | ||
1883 | static bool | |
1884 | vu_set_inflight_fd(VuDev *dev, VhostUserMsg *vmsg) | |
1885 | { | |
1886 | int fd, i; | |
1887 | uint64_t mmap_size, mmap_offset; | |
1888 | uint16_t num_queues, queue_size; | |
1889 | void *rc; | |
1890 | ||
1891 | if (vmsg->fd_num != 1 || | |
1892 | vmsg->size != sizeof(vmsg->payload.inflight)) { | |
1893 | vu_panic(dev, "Invalid set_inflight_fd message size:%d fds:%d", | |
1894 | vmsg->size, vmsg->fd_num); | |
1895 | return false; | |
1896 | } | |
1897 | ||
1898 | fd = vmsg->fds[0]; | |
1899 | mmap_size = vmsg->payload.inflight.mmap_size; | |
1900 | mmap_offset = vmsg->payload.inflight.mmap_offset; | |
1901 | num_queues = vmsg->payload.inflight.num_queues; | |
1902 | queue_size = vmsg->payload.inflight.queue_size; | |
1903 | ||
1904 | DPRINT("set_inflight_fd mmap_size: %"PRId64"\n", mmap_size); | |
1905 | DPRINT("set_inflight_fd mmap_offset: %"PRId64"\n", mmap_offset); | |
1906 | DPRINT("set_inflight_fd num_queues: %"PRId16"\n", num_queues); | |
1907 | DPRINT("set_inflight_fd queue_size: %"PRId16"\n", queue_size); | |
1908 | ||
1909 | rc = mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, | |
1910 | fd, mmap_offset); | |
1911 | ||
1912 | if (rc == MAP_FAILED) { | |
1913 | vu_panic(dev, "set_inflight_fd mmap error: %s", strerror(errno)); | |
1914 | return false; | |
1915 | } | |
1916 | ||
1917 | if (dev->inflight_info.fd) { | |
1918 | close(dev->inflight_info.fd); | |
1919 | } | |
1920 | ||
1921 | if (dev->inflight_info.addr) { | |
1922 | munmap(dev->inflight_info.addr, dev->inflight_info.size); | |
1923 | } | |
1924 | ||
1925 | dev->inflight_info.fd = fd; | |
1926 | dev->inflight_info.addr = rc; | |
1927 | dev->inflight_info.size = mmap_size; | |
1928 | ||
1929 | for (i = 0; i < num_queues; i++) { | |
1930 | dev->vq[i].inflight = (VuVirtqInflight *)rc; | |
1931 | dev->vq[i].inflight->desc_num = queue_size; | |
1932 | rc = (void *)((char *)rc + vu_inflight_queue_size(queue_size)); | |
1933 | } | |
1934 | ||
1935 | return false; | |
1936 | } | |
1937 | ||
ff132005 JB |
1938 | static bool |
1939 | vu_handle_vring_kick(VuDev *dev, VhostUserMsg *vmsg) | |
1940 | { | |
1941 | unsigned int index = vmsg->payload.state.index; | |
1942 | ||
1943 | if (index >= dev->max_queues) { | |
1944 | vu_panic(dev, "Invalid queue index: %u", index); | |
1945 | return false; | |
1946 | } | |
1947 | ||
5fd6921c | 1948 | DPRINT("Got kick message: handler:%p idx:%u\n", |
ff132005 JB |
1949 | dev->vq[index].handler, index); |
1950 | ||
1951 | if (!dev->vq[index].started) { | |
1952 | dev->vq[index].started = true; | |
1953 | ||
1954 | if (dev->iface->queue_set_started) { | |
1955 | dev->iface->queue_set_started(dev, index, true); | |
1956 | } | |
1957 | } | |
1958 | ||
1959 | if (dev->vq[index].handler) { | |
1960 | dev->vq[index].handler(dev, index); | |
1961 | } | |
1962 | ||
1963 | return false; | |
1964 | } | |
1965 | ||
6fb2e173 RN |
1966 | static bool vu_handle_get_max_memslots(VuDev *dev, VhostUserMsg *vmsg) |
1967 | { | |
69a5daec | 1968 | vmsg_set_reply_u64(vmsg, VHOST_USER_MAX_RAM_SLOTS); |
6fb2e173 | 1969 | |
b650d5f4 | 1970 | DPRINT("u64: 0x%016"PRIx64"\n", (uint64_t) VHOST_USER_MAX_RAM_SLOTS); |
6fb2e173 | 1971 | |
69a5daec | 1972 | return true; |
6fb2e173 RN |
1973 | } |
1974 | ||
7b2e5c65 MAL |
1975 | static bool |
1976 | vu_process_message(VuDev *dev, VhostUserMsg *vmsg) | |
1977 | { | |
1978 | int do_reply = 0; | |
1979 | ||
1980 | /* Print out generic part of the request. */ | |
1981 | DPRINT("================ Vhost user message ================\n"); | |
1982 | DPRINT("Request: %s (%d)\n", vu_request_to_string(vmsg->request), | |
1983 | vmsg->request); | |
1984 | DPRINT("Flags: 0x%x\n", vmsg->flags); | |
5fd6921c | 1985 | DPRINT("Size: %u\n", vmsg->size); |
7b2e5c65 MAL |
1986 | |
1987 | if (vmsg->fd_num) { | |
1988 | int i; | |
1989 | DPRINT("Fds:"); | |
1990 | for (i = 0; i < vmsg->fd_num; i++) { | |
1991 | DPRINT(" %d", vmsg->fds[i]); | |
1992 | } | |
1993 | DPRINT("\n"); | |
1994 | } | |
1995 | ||
1996 | if (dev->iface->process_msg && | |
1997 | dev->iface->process_msg(dev, vmsg, &do_reply)) { | |
1998 | return do_reply; | |
1999 | } | |
2000 | ||
2001 | switch (vmsg->request) { | |
2002 | case VHOST_USER_GET_FEATURES: | |
2003 | return vu_get_features_exec(dev, vmsg); | |
2004 | case VHOST_USER_SET_FEATURES: | |
2005 | return vu_set_features_exec(dev, vmsg); | |
2006 | case VHOST_USER_GET_PROTOCOL_FEATURES: | |
2007 | return vu_get_protocol_features_exec(dev, vmsg); | |
2008 | case VHOST_USER_SET_PROTOCOL_FEATURES: | |
2009 | return vu_set_protocol_features_exec(dev, vmsg); | |
2010 | case VHOST_USER_SET_OWNER: | |
2011 | return vu_set_owner_exec(dev, vmsg); | |
2012 | case VHOST_USER_RESET_OWNER: | |
2013 | return vu_reset_device_exec(dev, vmsg); | |
2014 | case VHOST_USER_SET_MEM_TABLE: | |
2015 | return vu_set_mem_table_exec(dev, vmsg); | |
2016 | case VHOST_USER_SET_LOG_BASE: | |
2017 | return vu_set_log_base_exec(dev, vmsg); | |
2018 | case VHOST_USER_SET_LOG_FD: | |
2019 | return vu_set_log_fd_exec(dev, vmsg); | |
2020 | case VHOST_USER_SET_VRING_NUM: | |
2021 | return vu_set_vring_num_exec(dev, vmsg); | |
2022 | case VHOST_USER_SET_VRING_ADDR: | |
2023 | return vu_set_vring_addr_exec(dev, vmsg); | |
2024 | case VHOST_USER_SET_VRING_BASE: | |
2025 | return vu_set_vring_base_exec(dev, vmsg); | |
2026 | case VHOST_USER_GET_VRING_BASE: | |
2027 | return vu_get_vring_base_exec(dev, vmsg); | |
2028 | case VHOST_USER_SET_VRING_KICK: | |
2029 | return vu_set_vring_kick_exec(dev, vmsg); | |
2030 | case VHOST_USER_SET_VRING_CALL: | |
2031 | return vu_set_vring_call_exec(dev, vmsg); | |
2032 | case VHOST_USER_SET_VRING_ERR: | |
2033 | return vu_set_vring_err_exec(dev, vmsg); | |
2034 | case VHOST_USER_GET_QUEUE_NUM: | |
2035 | return vu_get_queue_num_exec(dev, vmsg); | |
2036 | case VHOST_USER_SET_VRING_ENABLE: | |
2037 | return vu_set_vring_enable_exec(dev, vmsg); | |
e608feed | 2038 | case VHOST_USER_SET_BACKEND_REQ_FD: |
f8ed3648 | 2039 | return vu_set_backend_req_fd(dev, vmsg); |
0bc24d83 CL |
2040 | case VHOST_USER_GET_CONFIG: |
2041 | return vu_get_config(dev, vmsg); | |
2042 | case VHOST_USER_SET_CONFIG: | |
2043 | return vu_set_config(dev, vmsg); | |
2566378d | 2044 | case VHOST_USER_NONE: |
60798655 MAL |
2045 | /* if you need processing before exit, override iface->process_msg */ |
2046 | exit(0); | |
d3dff7a5 DDAG |
2047 | case VHOST_USER_POSTCOPY_ADVISE: |
2048 | return vu_set_postcopy_advise(dev, vmsg); | |
6864a7b5 DDAG |
2049 | case VHOST_USER_POSTCOPY_LISTEN: |
2050 | return vu_set_postcopy_listen(dev, vmsg); | |
c639187e DDAG |
2051 | case VHOST_USER_POSTCOPY_END: |
2052 | return vu_set_postcopy_end(dev, vmsg); | |
5f9ff1ef XY |
2053 | case VHOST_USER_GET_INFLIGHT_FD: |
2054 | return vu_get_inflight_fd(dev, vmsg); | |
2055 | case VHOST_USER_SET_INFLIGHT_FD: | |
2056 | return vu_set_inflight_fd(dev, vmsg); | |
ff132005 JB |
2057 | case VHOST_USER_VRING_KICK: |
2058 | return vu_handle_vring_kick(dev, vmsg); | |
6fb2e173 RN |
2059 | case VHOST_USER_GET_MAX_MEM_SLOTS: |
2060 | return vu_handle_get_max_memslots(dev, vmsg); | |
ec94c8e6 RN |
2061 | case VHOST_USER_ADD_MEM_REG: |
2062 | return vu_add_mem_reg(dev, vmsg); | |
875b9fd9 RN |
2063 | case VHOST_USER_REM_MEM_REG: |
2064 | return vu_rem_mem_reg(dev, vmsg); | |
ce0f3b03 AE |
2065 | case VHOST_USER_GET_SHARED_OBJECT: |
2066 | return vu_get_shared_object(dev, vmsg); | |
7b2e5c65 MAL |
2067 | default: |
2068 | vmsg_close_fds(vmsg); | |
2069 | vu_panic(dev, "Unhandled request: %d", vmsg->request); | |
2070 | } | |
2071 | ||
2072 | return false; | |
2073 | } | |
2074 | ||
2075 | bool | |
2076 | vu_dispatch(VuDev *dev) | |
2077 | { | |
2078 | VhostUserMsg vmsg = { 0, }; | |
2079 | int reply_requested; | |
8899d601 | 2080 | bool need_reply, success = false; |
7b2e5c65 | 2081 | |
049f5550 | 2082 | if (!dev->read_msg(dev, dev->sock, &vmsg)) { |
7b2e5c65 MAL |
2083 | goto end; |
2084 | } | |
2085 | ||
8899d601 JB |
2086 | need_reply = vmsg.flags & VHOST_USER_NEED_REPLY_MASK; |
2087 | ||
7b2e5c65 | 2088 | reply_requested = vu_process_message(dev, &vmsg); |
8899d601 JB |
2089 | if (!reply_requested && need_reply) { |
2090 | vmsg_set_reply_u64(&vmsg, 0); | |
2091 | reply_requested = 1; | |
2092 | } | |
2093 | ||
7b2e5c65 MAL |
2094 | if (!reply_requested) { |
2095 | success = true; | |
2096 | goto end; | |
2097 | } | |
2098 | ||
d84599f5 | 2099 | if (!vu_send_reply(dev, dev->sock, &vmsg)) { |
7b2e5c65 MAL |
2100 | goto end; |
2101 | } | |
2102 | ||
2103 | success = true; | |
2104 | ||
2105 | end: | |
eb078a9f | 2106 | free(vmsg.data); |
7b2e5c65 MAL |
2107 | return success; |
2108 | } | |
2109 | ||
2110 | void | |
2111 | vu_deinit(VuDev *dev) | |
2112 | { | |
92bf2461 | 2113 | unsigned int i; |
7b2e5c65 MAL |
2114 | |
2115 | for (i = 0; i < dev->nregions; i++) { | |
2116 | VuDevRegion *r = &dev->regions[i]; | |
2117 | void *m = (void *) (uintptr_t) r->mmap_addr; | |
2118 | if (m != MAP_FAILED) { | |
2119 | munmap(m, r->size + r->mmap_offset); | |
2120 | } | |
2121 | } | |
2122 | dev->nregions = 0; | |
2123 | ||
6f5fd837 | 2124 | for (i = 0; i < dev->max_queues; i++) { |
7b2e5c65 MAL |
2125 | VuVirtq *vq = &dev->vq[i]; |
2126 | ||
2127 | if (vq->call_fd != -1) { | |
2128 | close(vq->call_fd); | |
2129 | vq->call_fd = -1; | |
2130 | } | |
2131 | ||
2132 | if (vq->kick_fd != -1) { | |
f1baeee9 | 2133 | dev->remove_watch(dev, vq->kick_fd); |
7b2e5c65 MAL |
2134 | close(vq->kick_fd); |
2135 | vq->kick_fd = -1; | |
2136 | } | |
2137 | ||
2138 | if (vq->err_fd != -1) { | |
2139 | close(vq->err_fd); | |
2140 | vq->err_fd = -1; | |
2141 | } | |
5f9ff1ef XY |
2142 | |
2143 | if (vq->resubmit_list) { | |
2144 | free(vq->resubmit_list); | |
2145 | vq->resubmit_list = NULL; | |
2146 | } | |
2147 | ||
2148 | vq->inflight = NULL; | |
2149 | } | |
2150 | ||
2151 | if (dev->inflight_info.addr) { | |
2152 | munmap(dev->inflight_info.addr, dev->inflight_info.size); | |
2153 | dev->inflight_info.addr = NULL; | |
7b2e5c65 MAL |
2154 | } |
2155 | ||
5f9ff1ef XY |
2156 | if (dev->inflight_info.fd > 0) { |
2157 | close(dev->inflight_info.fd); | |
2158 | dev->inflight_info.fd = -1; | |
2159 | } | |
7b2e5c65 MAL |
2160 | |
2161 | vu_close_log(dev); | |
f8ed3648 MP |
2162 | if (dev->backend_fd != -1) { |
2163 | close(dev->backend_fd); | |
2164 | dev->backend_fd = -1; | |
13384f15 | 2165 | } |
f8ed3648 | 2166 | pthread_mutex_destroy(&dev->backend_mutex); |
7b2e5c65 MAL |
2167 | |
2168 | if (dev->sock != -1) { | |
2169 | close(dev->sock); | |
2170 | } | |
6f5fd837 SH |
2171 | |
2172 | free(dev->vq); | |
2173 | dev->vq = NULL; | |
7b2e5c65 MAL |
2174 | } |
2175 | ||
6f5fd837 | 2176 | bool |
7b2e5c65 | 2177 | vu_init(VuDev *dev, |
6f5fd837 | 2178 | uint16_t max_queues, |
7b2e5c65 MAL |
2179 | int socket, |
2180 | vu_panic_cb panic, | |
049f5550 | 2181 | vu_read_msg_cb read_msg, |
7b2e5c65 MAL |
2182 | vu_set_watch_cb set_watch, |
2183 | vu_remove_watch_cb remove_watch, | |
2184 | const VuDevIface *iface) | |
2185 | { | |
6f5fd837 | 2186 | uint16_t i; |
7b2e5c65 | 2187 | |
6f5fd837 | 2188 | assert(max_queues > 0); |
7b2e5c65 MAL |
2189 | assert(socket >= 0); |
2190 | assert(set_watch); | |
2191 | assert(remove_watch); | |
2192 | assert(iface); | |
2193 | assert(panic); | |
2194 | ||
2195 | memset(dev, 0, sizeof(*dev)); | |
2196 | ||
2197 | dev->sock = socket; | |
2198 | dev->panic = panic; | |
049f5550 | 2199 | dev->read_msg = read_msg ? read_msg : vu_message_read_default; |
7b2e5c65 MAL |
2200 | dev->set_watch = set_watch; |
2201 | dev->remove_watch = remove_watch; | |
2202 | dev->iface = iface; | |
2203 | dev->log_call_fd = -1; | |
f8ed3648 MP |
2204 | pthread_mutex_init(&dev->backend_mutex, NULL); |
2205 | dev->backend_fd = -1; | |
6f5fd837 SH |
2206 | dev->max_queues = max_queues; |
2207 | ||
2208 | dev->vq = malloc(max_queues * sizeof(dev->vq[0])); | |
2209 | if (!dev->vq) { | |
2210 | DPRINT("%s: failed to malloc virtqueues\n", __func__); | |
2211 | return false; | |
2212 | } | |
2213 | ||
2214 | for (i = 0; i < max_queues; i++) { | |
7b2e5c65 MAL |
2215 | dev->vq[i] = (VuVirtq) { |
2216 | .call_fd = -1, .kick_fd = -1, .err_fd = -1, | |
2217 | .notification = true, | |
2218 | }; | |
2219 | } | |
6f5fd837 SH |
2220 | |
2221 | return true; | |
7b2e5c65 MAL |
2222 | } |
2223 | ||
2224 | VuVirtq * | |
2225 | vu_get_queue(VuDev *dev, int qidx) | |
2226 | { | |
6f5fd837 | 2227 | assert(qidx < dev->max_queues); |
7b2e5c65 MAL |
2228 | return &dev->vq[qidx]; |
2229 | } | |
2230 | ||
2231 | bool | |
2232 | vu_queue_enabled(VuDev *dev, VuVirtq *vq) | |
2233 | { | |
2234 | return vq->enable; | |
2235 | } | |
2236 | ||
bcf0836d DDAG |
2237 | bool |
2238 | vu_queue_started(const VuDev *dev, const VuVirtq *vq) | |
2239 | { | |
2240 | return vq->started; | |
2241 | } | |
2242 | ||
7b2e5c65 MAL |
2243 | static inline uint16_t |
2244 | vring_avail_flags(VuVirtq *vq) | |
2245 | { | |
0ca29315 | 2246 | return le16toh(vq->vring.avail->flags); |
7b2e5c65 MAL |
2247 | } |
2248 | ||
2249 | static inline uint16_t | |
2250 | vring_avail_idx(VuVirtq *vq) | |
2251 | { | |
0ca29315 | 2252 | vq->shadow_avail_idx = le16toh(vq->vring.avail->idx); |
7b2e5c65 MAL |
2253 | |
2254 | return vq->shadow_avail_idx; | |
2255 | } | |
2256 | ||
2257 | static inline uint16_t | |
2258 | vring_avail_ring(VuVirtq *vq, int i) | |
2259 | { | |
0ca29315 | 2260 | return le16toh(vq->vring.avail->ring[i]); |
7b2e5c65 MAL |
2261 | } |
2262 | ||
2263 | static inline uint16_t | |
2264 | vring_get_used_event(VuVirtq *vq) | |
2265 | { | |
2266 | return vring_avail_ring(vq, vq->vring.num); | |
2267 | } | |
2268 | ||
2269 | static int | |
2270 | virtqueue_num_heads(VuDev *dev, VuVirtq *vq, unsigned int idx) | |
2271 | { | |
2272 | uint16_t num_heads = vring_avail_idx(vq) - idx; | |
2273 | ||
2274 | /* Check it isn't doing very strange things with descriptor numbers. */ | |
2275 | if (num_heads > vq->vring.num) { | |
2276 | vu_panic(dev, "Guest moved used index from %u to %u", | |
2277 | idx, vq->shadow_avail_idx); | |
2278 | return -1; | |
2279 | } | |
2280 | if (num_heads) { | |
2281 | /* On success, callers read a descriptor at vq->last_avail_idx. | |
2282 | * Make sure descriptor read does not bypass avail index read. */ | |
2283 | smp_rmb(); | |
2284 | } | |
2285 | ||
2286 | return num_heads; | |
2287 | } | |
2288 | ||
2289 | static bool | |
2290 | virtqueue_get_head(VuDev *dev, VuVirtq *vq, | |
2291 | unsigned int idx, unsigned int *head) | |
2292 | { | |
2293 | /* Grab the next descriptor number they're advertising, and increment | |
2294 | * the index we've seen. */ | |
2295 | *head = vring_avail_ring(vq, idx % vq->vring.num); | |
2296 | ||
2297 | /* If their number is silly, that's a fatal mistake. */ | |
2298 | if (*head >= vq->vring.num) { | |
8fe9805c | 2299 | vu_panic(dev, "Guest says index %u is available", *head); |
7b2e5c65 MAL |
2300 | return false; |
2301 | } | |
2302 | ||
2303 | return true; | |
2304 | } | |
2305 | ||
293084a7 YX |
2306 | static int |
2307 | virtqueue_read_indirect_desc(VuDev *dev, struct vring_desc *desc, | |
2308 | uint64_t addr, size_t len) | |
2309 | { | |
2310 | struct vring_desc *ori_desc; | |
2311 | uint64_t read_len; | |
2312 | ||
2313 | if (len > (VIRTQUEUE_MAX_SIZE * sizeof(struct vring_desc))) { | |
2314 | return -1; | |
2315 | } | |
2316 | ||
2317 | if (len == 0) { | |
2318 | return -1; | |
2319 | } | |
2320 | ||
2321 | while (len) { | |
2322 | read_len = len; | |
2323 | ori_desc = vu_gpa_to_va(dev, &read_len, addr); | |
2324 | if (!ori_desc) { | |
2325 | return -1; | |
2326 | } | |
2327 | ||
2328 | memcpy(desc, ori_desc, read_len); | |
2329 | len -= read_len; | |
2330 | addr += read_len; | |
2331 | desc += read_len; | |
2332 | } | |
2333 | ||
2334 | return 0; | |
2335 | } | |
2336 | ||
7b2e5c65 MAL |
2337 | enum { |
2338 | VIRTQUEUE_READ_DESC_ERROR = -1, | |
2339 | VIRTQUEUE_READ_DESC_DONE = 0, /* end of chain */ | |
2340 | VIRTQUEUE_READ_DESC_MORE = 1, /* more buffers in chain */ | |
2341 | }; | |
2342 | ||
2343 | static int | |
2344 | virtqueue_read_next_desc(VuDev *dev, struct vring_desc *desc, | |
2345 | int i, unsigned int max, unsigned int *next) | |
2346 | { | |
2347 | /* If this descriptor says it doesn't chain, we're done. */ | |
0ca29315 | 2348 | if (!(le16toh(desc[i].flags) & VRING_DESC_F_NEXT)) { |
7b2e5c65 MAL |
2349 | return VIRTQUEUE_READ_DESC_DONE; |
2350 | } | |
2351 | ||
2352 | /* Check they're not leading us off end of descriptors. */ | |
0ca29315 | 2353 | *next = le16toh(desc[i].next); |
7b2e5c65 MAL |
2354 | /* Make sure compiler knows to grab that: we don't want it changing! */ |
2355 | smp_wmb(); | |
2356 | ||
2357 | if (*next >= max) { | |
8fe9805c | 2358 | vu_panic(dev, "Desc next is %u", *next); |
7b2e5c65 MAL |
2359 | return VIRTQUEUE_READ_DESC_ERROR; |
2360 | } | |
2361 | ||
2362 | return VIRTQUEUE_READ_DESC_MORE; | |
2363 | } | |
2364 | ||
2365 | void | |
2366 | vu_queue_get_avail_bytes(VuDev *dev, VuVirtq *vq, unsigned int *in_bytes, | |
2367 | unsigned int *out_bytes, | |
2368 | unsigned max_in_bytes, unsigned max_out_bytes) | |
2369 | { | |
2370 | unsigned int idx; | |
2371 | unsigned int total_bufs, in_total, out_total; | |
2372 | int rc; | |
2373 | ||
2374 | idx = vq->last_avail_idx; | |
2375 | ||
2376 | total_bufs = in_total = out_total = 0; | |
640601c7 MAL |
2377 | if (unlikely(dev->broken) || |
2378 | unlikely(!vq->vring.avail)) { | |
2379 | goto done; | |
2380 | } | |
2381 | ||
7b2e5c65 | 2382 | while ((rc = virtqueue_num_heads(dev, vq, idx)) > 0) { |
293084a7 YX |
2383 | unsigned int max, desc_len, num_bufs, indirect = 0; |
2384 | uint64_t desc_addr, read_len; | |
7b2e5c65 | 2385 | struct vring_desc *desc; |
293084a7 | 2386 | struct vring_desc desc_buf[VIRTQUEUE_MAX_SIZE]; |
7b2e5c65 MAL |
2387 | unsigned int i; |
2388 | ||
2389 | max = vq->vring.num; | |
2390 | num_bufs = total_bufs; | |
2391 | if (!virtqueue_get_head(dev, vq, idx++, &i)) { | |
2392 | goto err; | |
2393 | } | |
2394 | desc = vq->vring.desc; | |
2395 | ||
0ca29315 MAL |
2396 | if (le16toh(desc[i].flags) & VRING_DESC_F_INDIRECT) { |
2397 | if (le32toh(desc[i].len) % sizeof(struct vring_desc)) { | |
7b2e5c65 MAL |
2398 | vu_panic(dev, "Invalid size for indirect buffer table"); |
2399 | goto err; | |
2400 | } | |
2401 | ||
2402 | /* If we've got too many, that implies a descriptor loop. */ | |
2403 | if (num_bufs >= max) { | |
2404 | vu_panic(dev, "Looped descriptor"); | |
2405 | goto err; | |
2406 | } | |
2407 | ||
2408 | /* loop over the indirect descriptor table */ | |
2409 | indirect = 1; | |
0ca29315 MAL |
2410 | desc_addr = le64toh(desc[i].addr); |
2411 | desc_len = le32toh(desc[i].len); | |
293084a7 YX |
2412 | max = desc_len / sizeof(struct vring_desc); |
2413 | read_len = desc_len; | |
2414 | desc = vu_gpa_to_va(dev, &read_len, desc_addr); | |
2415 | if (unlikely(desc && read_len != desc_len)) { | |
2416 | /* Failed to use zero copy */ | |
2417 | desc = NULL; | |
2418 | if (!virtqueue_read_indirect_desc(dev, desc_buf, | |
2419 | desc_addr, | |
2420 | desc_len)) { | |
2421 | desc = desc_buf; | |
2422 | } | |
2423 | } | |
2424 | if (!desc) { | |
2425 | vu_panic(dev, "Invalid indirect buffer table"); | |
2426 | goto err; | |
2427 | } | |
7b2e5c65 MAL |
2428 | num_bufs = i = 0; |
2429 | } | |
2430 | ||
2431 | do { | |
2432 | /* If we've got too many, that implies a descriptor loop. */ | |
2433 | if (++num_bufs > max) { | |
2434 | vu_panic(dev, "Looped descriptor"); | |
2435 | goto err; | |
2436 | } | |
2437 | ||
0ca29315 MAL |
2438 | if (le16toh(desc[i].flags) & VRING_DESC_F_WRITE) { |
2439 | in_total += le32toh(desc[i].len); | |
7b2e5c65 | 2440 | } else { |
0ca29315 | 2441 | out_total += le32toh(desc[i].len); |
7b2e5c65 MAL |
2442 | } |
2443 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { | |
2444 | goto done; | |
2445 | } | |
2446 | rc = virtqueue_read_next_desc(dev, desc, i, max, &i); | |
2447 | } while (rc == VIRTQUEUE_READ_DESC_MORE); | |
2448 | ||
2449 | if (rc == VIRTQUEUE_READ_DESC_ERROR) { | |
2450 | goto err; | |
2451 | } | |
2452 | ||
2453 | if (!indirect) { | |
2454 | total_bufs = num_bufs; | |
2455 | } else { | |
2456 | total_bufs++; | |
2457 | } | |
2458 | } | |
2459 | if (rc < 0) { | |
2460 | goto err; | |
2461 | } | |
2462 | done: | |
2463 | if (in_bytes) { | |
2464 | *in_bytes = in_total; | |
2465 | } | |
2466 | if (out_bytes) { | |
2467 | *out_bytes = out_total; | |
2468 | } | |
2469 | return; | |
2470 | ||
2471 | err: | |
2472 | in_total = out_total = 0; | |
2473 | goto done; | |
2474 | } | |
2475 | ||
2476 | bool | |
2477 | vu_queue_avail_bytes(VuDev *dev, VuVirtq *vq, unsigned int in_bytes, | |
2478 | unsigned int out_bytes) | |
2479 | { | |
2480 | unsigned int in_total, out_total; | |
2481 | ||
2482 | vu_queue_get_avail_bytes(dev, vq, &in_total, &out_total, | |
2483 | in_bytes, out_bytes); | |
2484 | ||
2485 | return in_bytes <= in_total && out_bytes <= out_total; | |
2486 | } | |
2487 | ||
2488 | /* Fetch avail_idx from VQ memory only when we really need to know if | |
2489 | * guest has added some buffers. */ | |
640601c7 | 2490 | bool |
7b2e5c65 MAL |
2491 | vu_queue_empty(VuDev *dev, VuVirtq *vq) |
2492 | { | |
640601c7 MAL |
2493 | if (unlikely(dev->broken) || |
2494 | unlikely(!vq->vring.avail)) { | |
2495 | return true; | |
2496 | } | |
2497 | ||
7b2e5c65 | 2498 | if (vq->shadow_avail_idx != vq->last_avail_idx) { |
640601c7 | 2499 | return false; |
7b2e5c65 MAL |
2500 | } |
2501 | ||
2502 | return vring_avail_idx(vq) == vq->last_avail_idx; | |
2503 | } | |
2504 | ||
7b2e5c65 MAL |
2505 | static bool |
2506 | vring_notify(VuDev *dev, VuVirtq *vq) | |
2507 | { | |
2508 | uint16_t old, new; | |
2509 | bool v; | |
2510 | ||
2511 | /* We need to expose used array entries before checking used event. */ | |
2512 | smp_mb(); | |
2513 | ||
2514 | /* Always notify when queue is empty (when feature acknowledge) */ | |
2515 | if (vu_has_feature(dev, VIRTIO_F_NOTIFY_ON_EMPTY) && | |
2516 | !vq->inuse && vu_queue_empty(dev, vq)) { | |
2517 | return true; | |
2518 | } | |
2519 | ||
2520 | if (!vu_has_feature(dev, VIRTIO_RING_F_EVENT_IDX)) { | |
2521 | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); | |
2522 | } | |
2523 | ||
2524 | v = vq->signalled_used_valid; | |
2525 | vq->signalled_used_valid = true; | |
2526 | old = vq->signalled_used; | |
2527 | new = vq->signalled_used = vq->used_idx; | |
2528 | return !v || vring_need_event(vring_get_used_event(vq), new, old); | |
2529 | } | |
2530 | ||
ff132005 | 2531 | static void _vu_queue_notify(VuDev *dev, VuVirtq *vq, bool sync) |
7b2e5c65 | 2532 | { |
640601c7 MAL |
2533 | if (unlikely(dev->broken) || |
2534 | unlikely(!vq->vring.avail)) { | |
7b2e5c65 MAL |
2535 | return; |
2536 | } | |
2537 | ||
2538 | if (!vring_notify(dev, vq)) { | |
2539 | DPRINT("skipped notify...\n"); | |
2540 | return; | |
2541 | } | |
2542 | ||
ff132005 JB |
2543 | if (vq->call_fd < 0 && |
2544 | vu_has_protocol_feature(dev, | |
2545 | VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS) && | |
e608feed | 2546 | vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_BACKEND_REQ)) { |
ff132005 | 2547 | VhostUserMsg vmsg = { |
e608feed | 2548 | .request = VHOST_USER_BACKEND_VRING_CALL, |
ff132005 JB |
2549 | .flags = VHOST_USER_VERSION, |
2550 | .size = sizeof(vmsg.payload.state), | |
2551 | .payload.state = { | |
2552 | .index = vq - dev->vq, | |
2553 | }, | |
2554 | }; | |
2555 | bool ack = sync && | |
2556 | vu_has_protocol_feature(dev, | |
2557 | VHOST_USER_PROTOCOL_F_REPLY_ACK); | |
2558 | ||
2559 | if (ack) { | |
2560 | vmsg.flags |= VHOST_USER_NEED_REPLY_MASK; | |
2561 | } | |
2562 | ||
f8ed3648 | 2563 | vu_message_write(dev, dev->backend_fd, &vmsg); |
ff132005 | 2564 | if (ack) { |
f8ed3648 | 2565 | vu_message_read_default(dev, dev->backend_fd, &vmsg); |
ff132005 JB |
2566 | } |
2567 | return; | |
2568 | } | |
2569 | ||
7b2e5c65 MAL |
2570 | if (eventfd_write(vq->call_fd, 1) < 0) { |
2571 | vu_panic(dev, "Error writing eventfd: %s", strerror(errno)); | |
2572 | } | |
2573 | } | |
2574 | ||
ff132005 JB |
2575 | void vu_queue_notify(VuDev *dev, VuVirtq *vq) |
2576 | { | |
2577 | _vu_queue_notify(dev, vq, false); | |
2578 | } | |
2579 | ||
2580 | void vu_queue_notify_sync(VuDev *dev, VuVirtq *vq) | |
2581 | { | |
2582 | _vu_queue_notify(dev, vq, true); | |
2583 | } | |
2584 | ||
ca858a5f VSO |
2585 | void vu_config_change_msg(VuDev *dev) |
2586 | { | |
2587 | VhostUserMsg vmsg = { | |
2588 | .request = VHOST_USER_BACKEND_CONFIG_CHANGE_MSG, | |
2589 | .flags = VHOST_USER_VERSION, | |
2590 | }; | |
2591 | ||
f8ed3648 | 2592 | vu_message_write(dev, dev->backend_fd, &vmsg); |
ca858a5f VSO |
2593 | } |
2594 | ||
7b2e5c65 MAL |
2595 | static inline void |
2596 | vring_used_flags_set_bit(VuVirtq *vq, int mask) | |
2597 | { | |
2598 | uint16_t *flags; | |
2599 | ||
2600 | flags = (uint16_t *)((char*)vq->vring.used + | |
2601 | offsetof(struct vring_used, flags)); | |
0ca29315 | 2602 | *flags = htole16(le16toh(*flags) | mask); |
7b2e5c65 MAL |
2603 | } |
2604 | ||
2605 | static inline void | |
2606 | vring_used_flags_unset_bit(VuVirtq *vq, int mask) | |
2607 | { | |
2608 | uint16_t *flags; | |
2609 | ||
2610 | flags = (uint16_t *)((char*)vq->vring.used + | |
2611 | offsetof(struct vring_used, flags)); | |
0ca29315 | 2612 | *flags = htole16(le16toh(*flags) & ~mask); |
7b2e5c65 MAL |
2613 | } |
2614 | ||
2615 | static inline void | |
2616 | vring_set_avail_event(VuVirtq *vq, uint16_t val) | |
2617 | { | |
950a2f2e | 2618 | uint16_t val_le = htole16(val); |
0ca29315 | 2619 | |
7b2e5c65 MAL |
2620 | if (!vq->notification) { |
2621 | return; | |
2622 | } | |
2623 | ||
950a2f2e | 2624 | memcpy(&vq->vring.used->ring[vq->vring.num], &val_le, sizeof(uint16_t)); |
7b2e5c65 MAL |
2625 | } |
2626 | ||
2627 | void | |
2628 | vu_queue_set_notification(VuDev *dev, VuVirtq *vq, int enable) | |
2629 | { | |
2630 | vq->notification = enable; | |
2631 | if (vu_has_feature(dev, VIRTIO_RING_F_EVENT_IDX)) { | |
2632 | vring_set_avail_event(vq, vring_avail_idx(vq)); | |
2633 | } else if (enable) { | |
2634 | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); | |
2635 | } else { | |
2636 | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); | |
2637 | } | |
2638 | if (enable) { | |
2639 | /* Expose avail event/used flags before caller checks the avail idx. */ | |
2640 | smp_mb(); | |
2641 | } | |
2642 | } | |
2643 | ||
fd40901c | 2644 | static bool |
7b2e5c65 MAL |
2645 | virtqueue_map_desc(VuDev *dev, |
2646 | unsigned int *p_num_sg, struct iovec *iov, | |
2647 | unsigned int max_num_sg, bool is_write, | |
2648 | uint64_t pa, size_t sz) | |
2649 | { | |
2650 | unsigned num_sg = *p_num_sg; | |
2651 | ||
2652 | assert(num_sg <= max_num_sg); | |
2653 | ||
2654 | if (!sz) { | |
2655 | vu_panic(dev, "virtio: zero sized buffers are not allowed"); | |
fd40901c | 2656 | return false; |
7b2e5c65 MAL |
2657 | } |
2658 | ||
293084a7 YX |
2659 | while (sz) { |
2660 | uint64_t len = sz; | |
2661 | ||
2662 | if (num_sg == max_num_sg) { | |
2663 | vu_panic(dev, "virtio: too many descriptors in indirect table"); | |
fd40901c | 2664 | return false; |
293084a7 YX |
2665 | } |
2666 | ||
2667 | iov[num_sg].iov_base = vu_gpa_to_va(dev, &len, pa); | |
2668 | if (iov[num_sg].iov_base == NULL) { | |
2669 | vu_panic(dev, "virtio: invalid address for buffers"); | |
fd40901c | 2670 | return false; |
293084a7 YX |
2671 | } |
2672 | iov[num_sg].iov_len = len; | |
2673 | num_sg++; | |
2674 | sz -= len; | |
2675 | pa += len; | |
2676 | } | |
7b2e5c65 MAL |
2677 | |
2678 | *p_num_sg = num_sg; | |
fd40901c | 2679 | return true; |
7b2e5c65 MAL |
2680 | } |
2681 | ||
7b2e5c65 MAL |
2682 | static void * |
2683 | virtqueue_alloc_element(size_t sz, | |
2684 | unsigned out_num, unsigned in_num) | |
2685 | { | |
2686 | VuVirtqElement *elem; | |
2687 | size_t in_sg_ofs = ALIGN_UP(sz, __alignof__(elem->in_sg[0])); | |
2688 | size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]); | |
2689 | size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]); | |
2690 | ||
2691 | assert(sz >= sizeof(VuVirtqElement)); | |
2692 | elem = malloc(out_sg_end); | |
9c191605 CL |
2693 | if (!elem) { |
2694 | DPRINT("%s: failed to malloc virtqueue element\n", __func__); | |
2695 | return NULL; | |
2696 | } | |
7b2e5c65 MAL |
2697 | elem->out_num = out_num; |
2698 | elem->in_num = in_num; | |
2699 | elem->in_sg = (void *)elem + in_sg_ofs; | |
2700 | elem->out_sg = (void *)elem + out_sg_ofs; | |
2701 | return elem; | |
2702 | } | |
2703 | ||
f7671f3d XY |
2704 | static void * |
2705 | vu_queue_map_desc(VuDev *dev, VuVirtq *vq, unsigned int idx, size_t sz) | |
7b2e5c65 | 2706 | { |
f7671f3d | 2707 | struct vring_desc *desc = vq->vring.desc; |
293084a7 | 2708 | uint64_t desc_addr, read_len; |
f7671f3d XY |
2709 | unsigned int desc_len; |
2710 | unsigned int max = vq->vring.num; | |
2711 | unsigned int i = idx; | |
7b2e5c65 | 2712 | VuVirtqElement *elem; |
f7671f3d | 2713 | unsigned int out_num = 0, in_num = 0; |
7b2e5c65 | 2714 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; |
293084a7 | 2715 | struct vring_desc desc_buf[VIRTQUEUE_MAX_SIZE]; |
7b2e5c65 MAL |
2716 | int rc; |
2717 | ||
0ca29315 MAL |
2718 | if (le16toh(desc[i].flags) & VRING_DESC_F_INDIRECT) { |
2719 | if (le32toh(desc[i].len) % sizeof(struct vring_desc)) { | |
7b2e5c65 | 2720 | vu_panic(dev, "Invalid size for indirect buffer table"); |
fd40901c | 2721 | return NULL; |
7b2e5c65 MAL |
2722 | } |
2723 | ||
2724 | /* loop over the indirect descriptor table */ | |
0ca29315 MAL |
2725 | desc_addr = le64toh(desc[i].addr); |
2726 | desc_len = le32toh(desc[i].len); | |
293084a7 YX |
2727 | max = desc_len / sizeof(struct vring_desc); |
2728 | read_len = desc_len; | |
2729 | desc = vu_gpa_to_va(dev, &read_len, desc_addr); | |
2730 | if (unlikely(desc && read_len != desc_len)) { | |
2731 | /* Failed to use zero copy */ | |
2732 | desc = NULL; | |
2733 | if (!virtqueue_read_indirect_desc(dev, desc_buf, | |
2734 | desc_addr, | |
2735 | desc_len)) { | |
2736 | desc = desc_buf; | |
2737 | } | |
2738 | } | |
2739 | if (!desc) { | |
2740 | vu_panic(dev, "Invalid indirect buffer table"); | |
2741 | return NULL; | |
2742 | } | |
7b2e5c65 MAL |
2743 | i = 0; |
2744 | } | |
2745 | ||
2746 | /* Collect all the descriptors */ | |
2747 | do { | |
0ca29315 | 2748 | if (le16toh(desc[i].flags) & VRING_DESC_F_WRITE) { |
fd40901c | 2749 | if (!virtqueue_map_desc(dev, &in_num, iov + out_num, |
7b2e5c65 | 2750 | VIRTQUEUE_MAX_SIZE - out_num, true, |
0ca29315 MAL |
2751 | le64toh(desc[i].addr), |
2752 | le32toh(desc[i].len))) { | |
fd40901c SH |
2753 | return NULL; |
2754 | } | |
7b2e5c65 MAL |
2755 | } else { |
2756 | if (in_num) { | |
2757 | vu_panic(dev, "Incorrect order for descriptors"); | |
2758 | return NULL; | |
2759 | } | |
fd40901c | 2760 | if (!virtqueue_map_desc(dev, &out_num, iov, |
7b2e5c65 | 2761 | VIRTQUEUE_MAX_SIZE, false, |
0ca29315 MAL |
2762 | le64toh(desc[i].addr), |
2763 | le32toh(desc[i].len))) { | |
fd40901c SH |
2764 | return NULL; |
2765 | } | |
7b2e5c65 MAL |
2766 | } |
2767 | ||
2768 | /* If we've got too many, that implies a descriptor loop. */ | |
2769 | if ((in_num + out_num) > max) { | |
2770 | vu_panic(dev, "Looped descriptor"); | |
fd40901c | 2771 | return NULL; |
7b2e5c65 MAL |
2772 | } |
2773 | rc = virtqueue_read_next_desc(dev, desc, i, max, &i); | |
2774 | } while (rc == VIRTQUEUE_READ_DESC_MORE); | |
2775 | ||
2776 | if (rc == VIRTQUEUE_READ_DESC_ERROR) { | |
f7671f3d | 2777 | vu_panic(dev, "read descriptor error"); |
7b2e5c65 MAL |
2778 | return NULL; |
2779 | } | |
2780 | ||
2781 | /* Now copy what we have collected and mapped */ | |
2782 | elem = virtqueue_alloc_element(sz, out_num, in_num); | |
9c191605 CL |
2783 | if (!elem) { |
2784 | return NULL; | |
2785 | } | |
f7671f3d | 2786 | elem->index = idx; |
7b2e5c65 MAL |
2787 | for (i = 0; i < out_num; i++) { |
2788 | elem->out_sg[i] = iov[i]; | |
2789 | } | |
2790 | for (i = 0; i < in_num; i++) { | |
2791 | elem->in_sg[i] = iov[out_num + i]; | |
2792 | } | |
2793 | ||
f7671f3d XY |
2794 | return elem; |
2795 | } | |
2796 | ||
5f9ff1ef XY |
2797 | static int |
2798 | vu_queue_inflight_get(VuDev *dev, VuVirtq *vq, int desc_idx) | |
2799 | { | |
eeb39263 | 2800 | if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) { |
5f9ff1ef XY |
2801 | return 0; |
2802 | } | |
2803 | ||
2804 | if (unlikely(!vq->inflight)) { | |
2805 | return -1; | |
2806 | } | |
2807 | ||
2808 | vq->inflight->desc[desc_idx].counter = vq->counter++; | |
2809 | vq->inflight->desc[desc_idx].inflight = 1; | |
2810 | ||
2811 | return 0; | |
2812 | } | |
2813 | ||
2814 | static int | |
2815 | vu_queue_inflight_pre_put(VuDev *dev, VuVirtq *vq, int desc_idx) | |
2816 | { | |
eeb39263 | 2817 | if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) { |
5f9ff1ef XY |
2818 | return 0; |
2819 | } | |
2820 | ||
2821 | if (unlikely(!vq->inflight)) { | |
2822 | return -1; | |
2823 | } | |
2824 | ||
2825 | vq->inflight->last_batch_head = desc_idx; | |
2826 | ||
2827 | return 0; | |
2828 | } | |
2829 | ||
2830 | static int | |
2831 | vu_queue_inflight_post_put(VuDev *dev, VuVirtq *vq, int desc_idx) | |
2832 | { | |
eeb39263 | 2833 | if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) { |
5f9ff1ef XY |
2834 | return 0; |
2835 | } | |
2836 | ||
2837 | if (unlikely(!vq->inflight)) { | |
2838 | return -1; | |
2839 | } | |
2840 | ||
2841 | barrier(); | |
2842 | ||
2843 | vq->inflight->desc[desc_idx].inflight = 0; | |
2844 | ||
2845 | barrier(); | |
2846 | ||
2847 | vq->inflight->used_idx = vq->used_idx; | |
2848 | ||
2849 | return 0; | |
2850 | } | |
2851 | ||
f7671f3d XY |
2852 | void * |
2853 | vu_queue_pop(VuDev *dev, VuVirtq *vq, size_t sz) | |
2854 | { | |
5f9ff1ef | 2855 | int i; |
f7671f3d XY |
2856 | unsigned int head; |
2857 | VuVirtqElement *elem; | |
2858 | ||
2859 | if (unlikely(dev->broken) || | |
2860 | unlikely(!vq->vring.avail)) { | |
2861 | return NULL; | |
2862 | } | |
2863 | ||
5f9ff1ef XY |
2864 | if (unlikely(vq->resubmit_list && vq->resubmit_num > 0)) { |
2865 | i = (--vq->resubmit_num); | |
2866 | elem = vu_queue_map_desc(dev, vq, vq->resubmit_list[i].index, sz); | |
2867 | ||
2868 | if (!vq->resubmit_num) { | |
2869 | free(vq->resubmit_list); | |
2870 | vq->resubmit_list = NULL; | |
2871 | } | |
2872 | ||
2873 | return elem; | |
2874 | } | |
2875 | ||
f7671f3d XY |
2876 | if (vu_queue_empty(dev, vq)) { |
2877 | return NULL; | |
2878 | } | |
2879 | /* | |
2880 | * Needed after virtio_queue_empty(), see comment in | |
2881 | * virtqueue_num_heads(). | |
2882 | */ | |
2883 | smp_rmb(); | |
2884 | ||
2885 | if (vq->inuse >= vq->vring.num) { | |
2886 | vu_panic(dev, "Virtqueue size exceeded"); | |
2887 | return NULL; | |
2888 | } | |
2889 | ||
2890 | if (!virtqueue_get_head(dev, vq, vq->last_avail_idx++, &head)) { | |
2891 | return NULL; | |
2892 | } | |
2893 | ||
2894 | if (vu_has_feature(dev, VIRTIO_RING_F_EVENT_IDX)) { | |
2895 | vring_set_avail_event(vq, vq->last_avail_idx); | |
2896 | } | |
2897 | ||
2898 | elem = vu_queue_map_desc(dev, vq, head, sz); | |
2899 | ||
2900 | if (!elem) { | |
2901 | return NULL; | |
2902 | } | |
2903 | ||
7b2e5c65 MAL |
2904 | vq->inuse++; |
2905 | ||
5f9ff1ef XY |
2906 | vu_queue_inflight_get(dev, vq, head); |
2907 | ||
7b2e5c65 MAL |
2908 | return elem; |
2909 | } | |
2910 | ||
b13919ab MAL |
2911 | static void |
2912 | vu_queue_detach_element(VuDev *dev, VuVirtq *vq, VuVirtqElement *elem, | |
2913 | size_t len) | |
2914 | { | |
2915 | vq->inuse--; | |
2916 | /* unmap, when DMA support is added */ | |
2917 | } | |
2918 | ||
2919 | void | |
2920 | vu_queue_unpop(VuDev *dev, VuVirtq *vq, VuVirtqElement *elem, | |
2921 | size_t len) | |
2922 | { | |
2923 | vq->last_avail_idx--; | |
2924 | vu_queue_detach_element(dev, vq, elem, len); | |
2925 | } | |
2926 | ||
7b2e5c65 MAL |
2927 | bool |
2928 | vu_queue_rewind(VuDev *dev, VuVirtq *vq, unsigned int num) | |
2929 | { | |
2930 | if (num > vq->inuse) { | |
2931 | return false; | |
2932 | } | |
2933 | vq->last_avail_idx -= num; | |
2934 | vq->inuse -= num; | |
2935 | return true; | |
2936 | } | |
2937 | ||
2938 | static inline | |
2939 | void vring_used_write(VuDev *dev, VuVirtq *vq, | |
2940 | struct vring_used_elem *uelem, int i) | |
2941 | { | |
2942 | struct vring_used *used = vq->vring.used; | |
2943 | ||
2944 | used->ring[i] = *uelem; | |
2945 | vu_log_write(dev, vq->vring.log_guest_addr + | |
2946 | offsetof(struct vring_used, ring[i]), | |
2947 | sizeof(used->ring[i])); | |
2948 | } | |
2949 | ||
2950 | ||
2951 | static void | |
2952 | vu_log_queue_fill(VuDev *dev, VuVirtq *vq, | |
2953 | const VuVirtqElement *elem, | |
2954 | unsigned int len) | |
2955 | { | |
2956 | struct vring_desc *desc = vq->vring.desc; | |
293084a7 YX |
2957 | unsigned int i, max, min, desc_len; |
2958 | uint64_t desc_addr, read_len; | |
2959 | struct vring_desc desc_buf[VIRTQUEUE_MAX_SIZE]; | |
7b2e5c65 MAL |
2960 | unsigned num_bufs = 0; |
2961 | ||
2962 | max = vq->vring.num; | |
2963 | i = elem->index; | |
2964 | ||
0ca29315 MAL |
2965 | if (le16toh(desc[i].flags) & VRING_DESC_F_INDIRECT) { |
2966 | if (le32toh(desc[i].len) % sizeof(struct vring_desc)) { | |
7b2e5c65 | 2967 | vu_panic(dev, "Invalid size for indirect buffer table"); |
81384055 | 2968 | return; |
7b2e5c65 MAL |
2969 | } |
2970 | ||
2971 | /* loop over the indirect descriptor table */ | |
0ca29315 MAL |
2972 | desc_addr = le64toh(desc[i].addr); |
2973 | desc_len = le32toh(desc[i].len); | |
293084a7 YX |
2974 | max = desc_len / sizeof(struct vring_desc); |
2975 | read_len = desc_len; | |
2976 | desc = vu_gpa_to_va(dev, &read_len, desc_addr); | |
2977 | if (unlikely(desc && read_len != desc_len)) { | |
2978 | /* Failed to use zero copy */ | |
2979 | desc = NULL; | |
2980 | if (!virtqueue_read_indirect_desc(dev, desc_buf, | |
2981 | desc_addr, | |
2982 | desc_len)) { | |
2983 | desc = desc_buf; | |
2984 | } | |
2985 | } | |
2986 | if (!desc) { | |
2987 | vu_panic(dev, "Invalid indirect buffer table"); | |
2988 | return; | |
2989 | } | |
7b2e5c65 MAL |
2990 | i = 0; |
2991 | } | |
2992 | ||
2993 | do { | |
2994 | if (++num_bufs > max) { | |
2995 | vu_panic(dev, "Looped descriptor"); | |
2996 | return; | |
2997 | } | |
2998 | ||
0ca29315 MAL |
2999 | if (le16toh(desc[i].flags) & VRING_DESC_F_WRITE) { |
3000 | min = MIN(le32toh(desc[i].len), len); | |
3001 | vu_log_write(dev, le64toh(desc[i].addr), min); | |
7b2e5c65 MAL |
3002 | len -= min; |
3003 | } | |
3004 | ||
3005 | } while (len > 0 && | |
3006 | (virtqueue_read_next_desc(dev, desc, i, max, &i) | |
3007 | == VIRTQUEUE_READ_DESC_MORE)); | |
3008 | } | |
3009 | ||
3010 | void | |
3011 | vu_queue_fill(VuDev *dev, VuVirtq *vq, | |
3012 | const VuVirtqElement *elem, | |
3013 | unsigned int len, unsigned int idx) | |
3014 | { | |
3015 | struct vring_used_elem uelem; | |
3016 | ||
640601c7 MAL |
3017 | if (unlikely(dev->broken) || |
3018 | unlikely(!vq->vring.avail)) { | |
7b2e5c65 MAL |
3019 | return; |
3020 | } | |
3021 | ||
3022 | vu_log_queue_fill(dev, vq, elem, len); | |
3023 | ||
3024 | idx = (idx + vq->used_idx) % vq->vring.num; | |
3025 | ||
0ca29315 MAL |
3026 | uelem.id = htole32(elem->index); |
3027 | uelem.len = htole32(len); | |
7b2e5c65 MAL |
3028 | vring_used_write(dev, vq, &uelem, idx); |
3029 | } | |
3030 | ||
3031 | static inline | |
3032 | void vring_used_idx_set(VuDev *dev, VuVirtq *vq, uint16_t val) | |
3033 | { | |
0ca29315 | 3034 | vq->vring.used->idx = htole16(val); |
7b2e5c65 MAL |
3035 | vu_log_write(dev, |
3036 | vq->vring.log_guest_addr + offsetof(struct vring_used, idx), | |
3037 | sizeof(vq->vring.used->idx)); | |
3038 | ||
3039 | vq->used_idx = val; | |
3040 | } | |
3041 | ||
3042 | void | |
3043 | vu_queue_flush(VuDev *dev, VuVirtq *vq, unsigned int count) | |
3044 | { | |
3045 | uint16_t old, new; | |
3046 | ||
640601c7 MAL |
3047 | if (unlikely(dev->broken) || |
3048 | unlikely(!vq->vring.avail)) { | |
7b2e5c65 MAL |
3049 | return; |
3050 | } | |
3051 | ||
3052 | /* Make sure buffer is written before we update index. */ | |
3053 | smp_wmb(); | |
3054 | ||
3055 | old = vq->used_idx; | |
3056 | new = old + count; | |
3057 | vring_used_idx_set(dev, vq, new); | |
3058 | vq->inuse -= count; | |
3059 | if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) { | |
3060 | vq->signalled_used_valid = false; | |
3061 | } | |
3062 | } | |
3063 | ||
3064 | void | |
3065 | vu_queue_push(VuDev *dev, VuVirtq *vq, | |
3066 | const VuVirtqElement *elem, unsigned int len) | |
3067 | { | |
3068 | vu_queue_fill(dev, vq, elem, len, 0); | |
5f9ff1ef | 3069 | vu_queue_inflight_pre_put(dev, vq, elem->index); |
7b2e5c65 | 3070 | vu_queue_flush(dev, vq, 1); |
5f9ff1ef | 3071 | vu_queue_inflight_post_put(dev, vq, elem->index); |
7b2e5c65 | 3072 | } |