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Commit | Line | Data |
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5f6f6664 NN |
1 | /* |
2 | * vhost-user | |
3 | * | |
4 | * Copyright (c) 2013 Virtual Open Systems Sarl. | |
5 | * | |
6 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
7 | * See the COPYING file in the top-level directory. | |
8 | * | |
9 | */ | |
10 | ||
9b8bfe21 | 11 | #include "qemu/osdep.h" |
da34e65c | 12 | #include "qapi/error.h" |
16094766 | 13 | #include "hw/virtio/virtio-dmabuf.h" |
5f6f6664 | 14 | #include "hw/virtio/vhost.h" |
5c33f978 | 15 | #include "hw/virtio/virtio-crypto.h" |
4d0cf552 | 16 | #include "hw/virtio/vhost-user.h" |
5f6f6664 | 17 | #include "hw/virtio/vhost-backend.h" |
44866521 | 18 | #include "hw/virtio/virtio.h" |
3e866365 | 19 | #include "hw/virtio/virtio-net.h" |
4d43a603 | 20 | #include "chardev/char-fe.h" |
57dc0217 | 21 | #include "io/channel-socket.h" |
5f6f6664 NN |
22 | #include "sysemu/kvm.h" |
23 | #include "qemu/error-report.h" | |
db725815 | 24 | #include "qemu/main-loop.h" |
16094766 | 25 | #include "qemu/uuid.h" |
5f6f6664 | 26 | #include "qemu/sockets.h" |
71e076a0 | 27 | #include "sysemu/runstate.h" |
efbfeb81 | 28 | #include "sysemu/cryptodev.h" |
9ccbfe14 | 29 | #include "migration/postcopy-ram.h" |
6864a7b5 | 30 | #include "trace.h" |
0b0af4d6 | 31 | #include "exec/ramblock.h" |
5f6f6664 | 32 | |
5f6f6664 NN |
33 | #include <sys/ioctl.h> |
34 | #include <sys/socket.h> | |
35 | #include <sys/un.h> | |
18658a3c PB |
36 | |
37 | #include "standard-headers/linux/vhost_types.h" | |
38 | ||
39 | #ifdef CONFIG_LINUX | |
375318d0 | 40 | #include <linux/userfaultfd.h> |
18658a3c | 41 | #endif |
5f6f6664 | 42 | |
27598393 | 43 | #define VHOST_MEMORY_BASELINE_NREGIONS 8 |
dcb10c00 | 44 | #define VHOST_USER_F_PROTOCOL_FEATURES 30 |
a84ec993 | 45 | #define VHOST_USER_BACKEND_MAX_FDS 8 |
e2051e9e | 46 | |
bab10530 | 47 | #if defined(TARGET_PPC) || defined(TARGET_PPC64) |
27598393 RN |
48 | #include "hw/ppc/spapr.h" |
49 | #define VHOST_USER_MAX_RAM_SLOTS SPAPR_MAX_RAM_SLOTS | |
50 | ||
51 | #else | |
52 | #define VHOST_USER_MAX_RAM_SLOTS 512 | |
53 | #endif | |
54 | ||
4c3e257b CL |
55 | /* |
56 | * Maximum size of virtio device config space | |
57 | */ | |
58 | #define VHOST_USER_MAX_CONFIG_SIZE 256 | |
59 | ||
de1372d4 | 60 | #define VHOST_USER_PROTOCOL_FEATURE_MASK ((1 << VHOST_USER_PROTOCOL_F_MAX) - 1) |
5f6f6664 NN |
61 | |
62 | typedef enum VhostUserRequest { | |
63 | VHOST_USER_NONE = 0, | |
64 | VHOST_USER_GET_FEATURES = 1, | |
65 | VHOST_USER_SET_FEATURES = 2, | |
66 | VHOST_USER_SET_OWNER = 3, | |
60915dc4 | 67 | VHOST_USER_RESET_OWNER = 4, |
5f6f6664 NN |
68 | VHOST_USER_SET_MEM_TABLE = 5, |
69 | VHOST_USER_SET_LOG_BASE = 6, | |
70 | VHOST_USER_SET_LOG_FD = 7, | |
71 | VHOST_USER_SET_VRING_NUM = 8, | |
72 | VHOST_USER_SET_VRING_ADDR = 9, | |
73 | VHOST_USER_SET_VRING_BASE = 10, | |
74 | VHOST_USER_GET_VRING_BASE = 11, | |
75 | VHOST_USER_SET_VRING_KICK = 12, | |
76 | VHOST_USER_SET_VRING_CALL = 13, | |
77 | VHOST_USER_SET_VRING_ERR = 14, | |
dcb10c00 MT |
78 | VHOST_USER_GET_PROTOCOL_FEATURES = 15, |
79 | VHOST_USER_SET_PROTOCOL_FEATURES = 16, | |
e2051e9e | 80 | VHOST_USER_GET_QUEUE_NUM = 17, |
7263a0ad | 81 | VHOST_USER_SET_VRING_ENABLE = 18, |
3e866365 | 82 | VHOST_USER_SEND_RARP = 19, |
c5f048d8 | 83 | VHOST_USER_NET_SET_MTU = 20, |
a84ec993 | 84 | VHOST_USER_SET_BACKEND_REQ_FD = 21, |
6dcdd06e | 85 | VHOST_USER_IOTLB_MSG = 22, |
5df04f17 | 86 | VHOST_USER_SET_VRING_ENDIAN = 23, |
4c3e257b CL |
87 | VHOST_USER_GET_CONFIG = 24, |
88 | VHOST_USER_SET_CONFIG = 25, | |
efbfeb81 GA |
89 | VHOST_USER_CREATE_CRYPTO_SESSION = 26, |
90 | VHOST_USER_CLOSE_CRYPTO_SESSION = 27, | |
d3dff7a5 | 91 | VHOST_USER_POSTCOPY_ADVISE = 28, |
6864a7b5 | 92 | VHOST_USER_POSTCOPY_LISTEN = 29, |
c639187e | 93 | VHOST_USER_POSTCOPY_END = 30, |
5ad204bf XY |
94 | VHOST_USER_GET_INFLIGHT_FD = 31, |
95 | VHOST_USER_SET_INFLIGHT_FD = 32, | |
bd2e44fe | 96 | VHOST_USER_GPU_SET_SOCKET = 33, |
d91d57e6 | 97 | VHOST_USER_RESET_DEVICE = 34, |
6b0eff1a RN |
98 | /* Message number 35 reserved for VHOST_USER_VRING_KICK. */ |
99 | VHOST_USER_GET_MAX_MEM_SLOTS = 36, | |
f1aeb14b RN |
100 | VHOST_USER_ADD_MEM_REG = 37, |
101 | VHOST_USER_REM_MEM_REG = 38, | |
923b8921 YW |
102 | VHOST_USER_SET_STATUS = 39, |
103 | VHOST_USER_GET_STATUS = 40, | |
16094766 | 104 | VHOST_USER_GET_SHARED_OBJECT = 41, |
cda83adc HC |
105 | VHOST_USER_SET_DEVICE_STATE_FD = 42, |
106 | VHOST_USER_CHECK_DEVICE_STATE = 43, | |
5f6f6664 NN |
107 | VHOST_USER_MAX |
108 | } VhostUserRequest; | |
109 | ||
f8ed3648 | 110 | typedef enum VhostUserBackendRequest { |
a84ec993 MC |
111 | VHOST_USER_BACKEND_NONE = 0, |
112 | VHOST_USER_BACKEND_IOTLB_MSG = 1, | |
113 | VHOST_USER_BACKEND_CONFIG_CHANGE_MSG = 2, | |
114 | VHOST_USER_BACKEND_VRING_HOST_NOTIFIER_MSG = 3, | |
16094766 AE |
115 | VHOST_USER_BACKEND_SHARED_OBJECT_ADD = 6, |
116 | VHOST_USER_BACKEND_SHARED_OBJECT_REMOVE = 7, | |
117 | VHOST_USER_BACKEND_SHARED_OBJECT_LOOKUP = 8, | |
a84ec993 | 118 | VHOST_USER_BACKEND_MAX |
f8ed3648 | 119 | } VhostUserBackendRequest; |
4bbeeba0 | 120 | |
5f6f6664 NN |
121 | typedef struct VhostUserMemoryRegion { |
122 | uint64_t guest_phys_addr; | |
123 | uint64_t memory_size; | |
124 | uint64_t userspace_addr; | |
3fd74b84 | 125 | uint64_t mmap_offset; |
5f6f6664 NN |
126 | } VhostUserMemoryRegion; |
127 | ||
128 | typedef struct VhostUserMemory { | |
129 | uint32_t nregions; | |
130 | uint32_t padding; | |
27598393 | 131 | VhostUserMemoryRegion regions[VHOST_MEMORY_BASELINE_NREGIONS]; |
5f6f6664 NN |
132 | } VhostUserMemory; |
133 | ||
f1aeb14b | 134 | typedef struct VhostUserMemRegMsg { |
3009edff | 135 | uint64_t padding; |
f1aeb14b RN |
136 | VhostUserMemoryRegion region; |
137 | } VhostUserMemRegMsg; | |
138 | ||
2b8819c6 VK |
139 | typedef struct VhostUserLog { |
140 | uint64_t mmap_size; | |
141 | uint64_t mmap_offset; | |
142 | } VhostUserLog; | |
143 | ||
4c3e257b CL |
144 | typedef struct VhostUserConfig { |
145 | uint32_t offset; | |
146 | uint32_t size; | |
147 | uint32_t flags; | |
148 | uint8_t region[VHOST_USER_MAX_CONFIG_SIZE]; | |
149 | } VhostUserConfig; | |
150 | ||
efbfeb81 GA |
151 | #define VHOST_CRYPTO_SYM_HMAC_MAX_KEY_LEN 512 |
152 | #define VHOST_CRYPTO_SYM_CIPHER_MAX_KEY_LEN 64 | |
5c33f978 | 153 | #define VHOST_CRYPTO_ASYM_MAX_KEY_LEN 1024 |
efbfeb81 GA |
154 | |
155 | typedef struct VhostUserCryptoSession { | |
5c33f978 GM |
156 | uint64_t op_code; |
157 | union { | |
158 | struct { | |
159 | CryptoDevBackendSymSessionInfo session_setup_data; | |
160 | uint8_t key[VHOST_CRYPTO_SYM_CIPHER_MAX_KEY_LEN]; | |
161 | uint8_t auth_key[VHOST_CRYPTO_SYM_HMAC_MAX_KEY_LEN]; | |
162 | } sym; | |
163 | struct { | |
164 | CryptoDevBackendAsymSessionInfo session_setup_data; | |
165 | uint8_t key[VHOST_CRYPTO_ASYM_MAX_KEY_LEN]; | |
166 | } asym; | |
167 | } u; | |
168 | ||
efbfeb81 GA |
169 | /* session id for success, -1 on errors */ |
170 | int64_t session_id; | |
efbfeb81 GA |
171 | } VhostUserCryptoSession; |
172 | ||
4c3e257b CL |
173 | static VhostUserConfig c __attribute__ ((unused)); |
174 | #define VHOST_USER_CONFIG_HDR_SIZE (sizeof(c.offset) \ | |
175 | + sizeof(c.size) \ | |
176 | + sizeof(c.flags)) | |
177 | ||
44866521 TB |
178 | typedef struct VhostUserVringArea { |
179 | uint64_t u64; | |
180 | uint64_t size; | |
181 | uint64_t offset; | |
182 | } VhostUserVringArea; | |
183 | ||
5ad204bf XY |
184 | typedef struct VhostUserInflight { |
185 | uint64_t mmap_size; | |
186 | uint64_t mmap_offset; | |
187 | uint16_t num_queues; | |
188 | uint16_t queue_size; | |
189 | } VhostUserInflight; | |
190 | ||
16094766 AE |
191 | typedef struct VhostUserShared { |
192 | unsigned char uuid[16]; | |
193 | } VhostUserShared; | |
194 | ||
24e34754 | 195 | typedef struct { |
5f6f6664 NN |
196 | VhostUserRequest request; |
197 | ||
198 | #define VHOST_USER_VERSION_MASK (0x3) | |
c97c76b3 | 199 | #define VHOST_USER_REPLY_MASK (0x1 << 2) |
ca525ce5 | 200 | #define VHOST_USER_NEED_REPLY_MASK (0x1 << 3) |
5f6f6664 NN |
201 | uint32_t flags; |
202 | uint32_t size; /* the following payload size */ | |
24e34754 MT |
203 | } QEMU_PACKED VhostUserHeader; |
204 | ||
cda83adc HC |
205 | /* Request payload of VHOST_USER_SET_DEVICE_STATE_FD */ |
206 | typedef struct VhostUserTransferDeviceState { | |
207 | uint32_t direction; | |
208 | uint32_t phase; | |
209 | } VhostUserTransferDeviceState; | |
210 | ||
24e34754 | 211 | typedef union { |
5f6f6664 | 212 | #define VHOST_USER_VRING_IDX_MASK (0xff) |
c97c76b3 | 213 | #define VHOST_USER_VRING_NOFD_MASK (0x1 << 8) |
5f6f6664 NN |
214 | uint64_t u64; |
215 | struct vhost_vring_state state; | |
216 | struct vhost_vring_addr addr; | |
217 | VhostUserMemory memory; | |
f1aeb14b | 218 | VhostUserMemRegMsg mem_reg; |
2b8819c6 | 219 | VhostUserLog log; |
6dcdd06e | 220 | struct vhost_iotlb_msg iotlb; |
4c3e257b | 221 | VhostUserConfig config; |
efbfeb81 | 222 | VhostUserCryptoSession session; |
44866521 | 223 | VhostUserVringArea area; |
5ad204bf | 224 | VhostUserInflight inflight; |
16094766 | 225 | VhostUserShared object; |
cda83adc | 226 | VhostUserTransferDeviceState transfer_state; |
24e34754 MT |
227 | } VhostUserPayload; |
228 | ||
229 | typedef struct VhostUserMsg { | |
230 | VhostUserHeader hdr; | |
231 | VhostUserPayload payload; | |
5f6f6664 NN |
232 | } QEMU_PACKED VhostUserMsg; |
233 | ||
234 | static VhostUserMsg m __attribute__ ((unused)); | |
24e34754 | 235 | #define VHOST_USER_HDR_SIZE (sizeof(VhostUserHeader)) |
5f6f6664 | 236 | |
24e34754 | 237 | #define VHOST_USER_PAYLOAD_SIZE (sizeof(VhostUserPayload)) |
5f6f6664 NN |
238 | |
239 | /* The version of the protocol we support */ | |
240 | #define VHOST_USER_VERSION (0x1) | |
241 | ||
2152f3fe | 242 | struct vhost_user { |
9ccbfe14 | 243 | struct vhost_dev *dev; |
4d0cf552 TB |
244 | /* Shared between vhost devs of the same virtio device */ |
245 | VhostUserState *user; | |
f8ed3648 MP |
246 | QIOChannel *backend_ioc; |
247 | GSource *backend_src; | |
9ccbfe14 | 248 | NotifierWithReturn postcopy_notifier; |
f82c1116 | 249 | struct PostCopyFD postcopy_fd; |
27598393 | 250 | uint64_t postcopy_client_bases[VHOST_USER_MAX_RAM_SLOTS]; |
905125d0 DDAG |
251 | /* Length of the region_rb and region_rb_offset arrays */ |
252 | size_t region_rb_len; | |
253 | /* RAMBlock associated with a given region */ | |
254 | RAMBlock **region_rb; | |
c97c76b3 AB |
255 | /* |
256 | * The offset from the start of the RAMBlock to the start of the | |
905125d0 DDAG |
257 | * vhost region. |
258 | */ | |
259 | ram_addr_t *region_rb_offset; | |
260 | ||
6864a7b5 DDAG |
261 | /* True once we've entered postcopy_listen */ |
262 | bool postcopy_listen; | |
f1aeb14b RN |
263 | |
264 | /* Our current regions */ | |
265 | int num_shadow_regions; | |
27598393 | 266 | struct vhost_memory_region shadow_regions[VHOST_USER_MAX_RAM_SLOTS]; |
f1aeb14b RN |
267 | }; |
268 | ||
269 | struct scrub_regions { | |
270 | struct vhost_memory_region *region; | |
271 | int reg_idx; | |
272 | int fd_idx; | |
2152f3fe MAL |
273 | }; |
274 | ||
9af84c02 | 275 | static int vhost_user_read_header(struct vhost_dev *dev, VhostUserMsg *msg) |
5f6f6664 | 276 | { |
2152f3fe | 277 | struct vhost_user *u = dev->opaque; |
4d0cf552 | 278 | CharBackend *chr = u->user->chr; |
5f6f6664 NN |
279 | uint8_t *p = (uint8_t *) msg; |
280 | int r, size = VHOST_USER_HDR_SIZE; | |
281 | ||
282 | r = qemu_chr_fe_read_all(chr, p, size); | |
283 | if (r != size) { | |
025faa87 | 284 | int saved_errno = errno; |
5421f318 | 285 | error_report("Failed to read msg header. Read %d instead of %d." |
24e34754 | 286 | " Original request %d.", r, size, msg->hdr.request); |
025faa87 | 287 | return r < 0 ? -saved_errno : -EIO; |
5f6f6664 NN |
288 | } |
289 | ||
290 | /* validate received flags */ | |
24e34754 | 291 | if (msg->hdr.flags != (VHOST_USER_REPLY_MASK | VHOST_USER_VERSION)) { |
5f6f6664 | 292 | error_report("Failed to read msg header." |
24e34754 | 293 | " Flags 0x%x instead of 0x%x.", msg->hdr.flags, |
5f6f6664 | 294 | VHOST_USER_REPLY_MASK | VHOST_USER_VERSION); |
025faa87 | 295 | return -EPROTO; |
9af84c02 MAL |
296 | } |
297 | ||
643a9435 AB |
298 | trace_vhost_user_read(msg->hdr.request, msg->hdr.flags); |
299 | ||
9af84c02 MAL |
300 | return 0; |
301 | } | |
302 | ||
4382138f | 303 | static int vhost_user_read(struct vhost_dev *dev, VhostUserMsg *msg) |
9af84c02 MAL |
304 | { |
305 | struct vhost_user *u = dev->opaque; | |
306 | CharBackend *chr = u->user->chr; | |
307 | uint8_t *p = (uint8_t *) msg; | |
308 | int r, size; | |
309 | ||
025faa87 RK |
310 | r = vhost_user_read_header(dev, msg); |
311 | if (r < 0) { | |
4382138f | 312 | return r; |
5f6f6664 NN |
313 | } |
314 | ||
315 | /* validate message size is sane */ | |
24e34754 | 316 | if (msg->hdr.size > VHOST_USER_PAYLOAD_SIZE) { |
5f6f6664 | 317 | error_report("Failed to read msg header." |
24e34754 | 318 | " Size %d exceeds the maximum %zu.", msg->hdr.size, |
5f6f6664 | 319 | VHOST_USER_PAYLOAD_SIZE); |
4382138f | 320 | return -EPROTO; |
5f6f6664 NN |
321 | } |
322 | ||
24e34754 | 323 | if (msg->hdr.size) { |
5f6f6664 | 324 | p += VHOST_USER_HDR_SIZE; |
24e34754 | 325 | size = msg->hdr.size; |
5f6f6664 NN |
326 | r = qemu_chr_fe_read_all(chr, p, size); |
327 | if (r != size) { | |
025faa87 | 328 | int saved_errno = errno; |
5f6f6664 | 329 | error_report("Failed to read msg payload." |
24e34754 | 330 | " Read %d instead of %d.", r, msg->hdr.size); |
4382138f | 331 | return r < 0 ? -saved_errno : -EIO; |
5f6f6664 NN |
332 | } |
333 | } | |
334 | ||
4382138f | 335 | return 0; |
5f6f6664 NN |
336 | } |
337 | ||
ca525ce5 | 338 | static int process_message_reply(struct vhost_dev *dev, |
3cf7daf8 | 339 | const VhostUserMsg *msg) |
ca525ce5 | 340 | { |
025faa87 | 341 | int ret; |
60cd1102 | 342 | VhostUserMsg msg_reply; |
ca525ce5 | 343 | |
24e34754 | 344 | if ((msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) == 0) { |
60cd1102 ZY |
345 | return 0; |
346 | } | |
347 | ||
025faa87 RK |
348 | ret = vhost_user_read(dev, &msg_reply); |
349 | if (ret < 0) { | |
350 | return ret; | |
ca525ce5 PS |
351 | } |
352 | ||
24e34754 | 353 | if (msg_reply.hdr.request != msg->hdr.request) { |
edb40732 | 354 | error_report("Received unexpected msg type. " |
ca525ce5 | 355 | "Expected %d received %d", |
24e34754 | 356 | msg->hdr.request, msg_reply.hdr.request); |
025faa87 | 357 | return -EPROTO; |
ca525ce5 PS |
358 | } |
359 | ||
025faa87 | 360 | return msg_reply.payload.u64 ? -EIO : 0; |
ca525ce5 PS |
361 | } |
362 | ||
0dcb4172 | 363 | static bool vhost_user_per_device_request(VhostUserRequest request) |
21e70425 MAL |
364 | { |
365 | switch (request) { | |
366 | case VHOST_USER_SET_OWNER: | |
60915dc4 | 367 | case VHOST_USER_RESET_OWNER: |
21e70425 MAL |
368 | case VHOST_USER_SET_MEM_TABLE: |
369 | case VHOST_USER_GET_QUEUE_NUM: | |
c5f048d8 | 370 | case VHOST_USER_NET_SET_MTU: |
667e58ae | 371 | case VHOST_USER_RESET_DEVICE: |
920c184f MY |
372 | case VHOST_USER_ADD_MEM_REG: |
373 | case VHOST_USER_REM_MEM_REG: | |
21e70425 MAL |
374 | return true; |
375 | default: | |
376 | return false; | |
377 | } | |
378 | } | |
379 | ||
380 | /* most non-init callers ignore the error */ | |
5f6f6664 NN |
381 | static int vhost_user_write(struct vhost_dev *dev, VhostUserMsg *msg, |
382 | int *fds, int fd_num) | |
383 | { | |
2152f3fe | 384 | struct vhost_user *u = dev->opaque; |
4d0cf552 | 385 | CharBackend *chr = u->user->chr; |
24e34754 | 386 | int ret, size = VHOST_USER_HDR_SIZE + msg->hdr.size; |
5f6f6664 | 387 | |
21e70425 | 388 | /* |
0dcb4172 TL |
389 | * Some devices, like virtio-scsi, are implemented as a single vhost_dev, |
390 | * while others, like virtio-net, contain multiple vhost_devs. For | |
391 | * operations such as configuring device memory mappings or issuing device | |
392 | * resets, which affect the whole device instead of individual VQs, | |
393 | * vhost-user messages should only be sent once. | |
14288319 | 394 | * |
0dcb4172 TL |
395 | * Devices with multiple vhost_devs are given an associated dev->vq_index |
396 | * so per_device requests are only sent if vq_index is 0. | |
21e70425 | 397 | */ |
0dcb4172 TL |
398 | if (vhost_user_per_device_request(msg->hdr.request) |
399 | && dev->vq_index != 0) { | |
24e34754 | 400 | msg->hdr.flags &= ~VHOST_USER_NEED_REPLY_MASK; |
21e70425 MAL |
401 | return 0; |
402 | } | |
403 | ||
6fab2f3f | 404 | if (qemu_chr_fe_set_msgfds(chr, fds, fd_num) < 0) { |
f6b85710 | 405 | error_report("Failed to set msg fds."); |
025faa87 | 406 | return -EINVAL; |
6fab2f3f | 407 | } |
5f6f6664 | 408 | |
f6b85710 MAL |
409 | ret = qemu_chr_fe_write_all(chr, (const uint8_t *) msg, size); |
410 | if (ret != size) { | |
025faa87 | 411 | int saved_errno = errno; |
f6b85710 MAL |
412 | error_report("Failed to write msg." |
413 | " Wrote %d instead of %d.", ret, size); | |
025faa87 | 414 | return ret < 0 ? -saved_errno : -EIO; |
f6b85710 MAL |
415 | } |
416 | ||
6ca6d8ee AB |
417 | trace_vhost_user_write(msg->hdr.request, msg->hdr.flags); |
418 | ||
f6b85710 | 419 | return 0; |
5f6f6664 NN |
420 | } |
421 | ||
bd2e44fe MAL |
422 | int vhost_user_gpu_set_socket(struct vhost_dev *dev, int fd) |
423 | { | |
424 | VhostUserMsg msg = { | |
425 | .hdr.request = VHOST_USER_GPU_SET_SOCKET, | |
426 | .hdr.flags = VHOST_USER_VERSION, | |
427 | }; | |
428 | ||
429 | return vhost_user_write(dev, &msg, &fd, 1); | |
430 | } | |
431 | ||
21e70425 MAL |
432 | static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base, |
433 | struct vhost_log *log) | |
b931bfbf | 434 | { |
27598393 | 435 | int fds[VHOST_USER_MAX_RAM_SLOTS]; |
21e70425 MAL |
436 | size_t fd_num = 0; |
437 | bool shmfd = virtio_has_feature(dev->protocol_features, | |
438 | VHOST_USER_PROTOCOL_F_LOG_SHMFD); | |
025faa87 | 439 | int ret; |
21e70425 | 440 | VhostUserMsg msg = { |
24e34754 MT |
441 | .hdr.request = VHOST_USER_SET_LOG_BASE, |
442 | .hdr.flags = VHOST_USER_VERSION, | |
48854f57 | 443 | .payload.log.mmap_size = log->size * sizeof(*(log->log)), |
2b8819c6 | 444 | .payload.log.mmap_offset = 0, |
24e34754 | 445 | .hdr.size = sizeof(msg.payload.log), |
21e70425 MAL |
446 | }; |
447 | ||
c98ac64c YW |
448 | /* Send only once with first queue pair */ |
449 | if (dev->vq_index != 0) { | |
450 | return 0; | |
451 | } | |
452 | ||
21e70425 MAL |
453 | if (shmfd && log->fd != -1) { |
454 | fds[fd_num++] = log->fd; | |
455 | } | |
456 | ||
025faa87 RK |
457 | ret = vhost_user_write(dev, &msg, fds, fd_num); |
458 | if (ret < 0) { | |
459 | return ret; | |
c4843a45 | 460 | } |
21e70425 MAL |
461 | |
462 | if (shmfd) { | |
24e34754 | 463 | msg.hdr.size = 0; |
025faa87 RK |
464 | ret = vhost_user_read(dev, &msg); |
465 | if (ret < 0) { | |
466 | return ret; | |
21e70425 MAL |
467 | } |
468 | ||
24e34754 | 469 | if (msg.hdr.request != VHOST_USER_SET_LOG_BASE) { |
21e70425 MAL |
470 | error_report("Received unexpected msg type. " |
471 | "Expected %d received %d", | |
24e34754 | 472 | VHOST_USER_SET_LOG_BASE, msg.hdr.request); |
025faa87 | 473 | return -EPROTO; |
21e70425 | 474 | } |
b931bfbf | 475 | } |
21e70425 MAL |
476 | |
477 | return 0; | |
b931bfbf CO |
478 | } |
479 | ||
23374a84 RN |
480 | static MemoryRegion *vhost_user_get_mr_data(uint64_t addr, ram_addr_t *offset, |
481 | int *fd) | |
482 | { | |
483 | MemoryRegion *mr; | |
484 | ||
485 | assert((uintptr_t)addr == addr); | |
486 | mr = memory_region_from_host((void *)(uintptr_t)addr, offset); | |
487 | *fd = memory_region_get_fd(mr); | |
4b870dc4 | 488 | *offset += mr->ram_block->fd_offset; |
23374a84 RN |
489 | |
490 | return mr; | |
491 | } | |
492 | ||
ece99091 | 493 | static void vhost_user_fill_msg_region(VhostUserMemoryRegion *dst, |
8d193715 RN |
494 | struct vhost_memory_region *src, |
495 | uint64_t mmap_offset) | |
ece99091 RN |
496 | { |
497 | assert(src != NULL && dst != NULL); | |
498 | dst->userspace_addr = src->userspace_addr; | |
499 | dst->memory_size = src->memory_size; | |
500 | dst->guest_phys_addr = src->guest_phys_addr; | |
8d193715 | 501 | dst->mmap_offset = mmap_offset; |
ece99091 RN |
502 | } |
503 | ||
2d9da9df RN |
504 | static int vhost_user_fill_set_mem_table_msg(struct vhost_user *u, |
505 | struct vhost_dev *dev, | |
506 | VhostUserMsg *msg, | |
507 | int *fds, size_t *fd_num, | |
508 | bool track_ramblocks) | |
509 | { | |
510 | int i, fd; | |
511 | ram_addr_t offset; | |
512 | MemoryRegion *mr; | |
513 | struct vhost_memory_region *reg; | |
ece99091 | 514 | VhostUserMemoryRegion region_buffer; |
2d9da9df RN |
515 | |
516 | msg->hdr.request = VHOST_USER_SET_MEM_TABLE; | |
517 | ||
518 | for (i = 0; i < dev->mem->nregions; ++i) { | |
519 | reg = dev->mem->regions + i; | |
520 | ||
23374a84 | 521 | mr = vhost_user_get_mr_data(reg->userspace_addr, &offset, &fd); |
2d9da9df RN |
522 | if (fd > 0) { |
523 | if (track_ramblocks) { | |
27598393 | 524 | assert(*fd_num < VHOST_MEMORY_BASELINE_NREGIONS); |
2d9da9df RN |
525 | trace_vhost_user_set_mem_table_withfd(*fd_num, mr->name, |
526 | reg->memory_size, | |
527 | reg->guest_phys_addr, | |
528 | reg->userspace_addr, | |
529 | offset); | |
530 | u->region_rb_offset[i] = offset; | |
531 | u->region_rb[i] = mr->ram_block; | |
27598393 | 532 | } else if (*fd_num == VHOST_MEMORY_BASELINE_NREGIONS) { |
2d9da9df | 533 | error_report("Failed preparing vhost-user memory table msg"); |
025faa87 | 534 | return -ENOBUFS; |
2d9da9df | 535 | } |
8d193715 | 536 | vhost_user_fill_msg_region(®ion_buffer, reg, offset); |
ece99091 | 537 | msg->payload.memory.regions[*fd_num] = region_buffer; |
2d9da9df RN |
538 | fds[(*fd_num)++] = fd; |
539 | } else if (track_ramblocks) { | |
540 | u->region_rb_offset[i] = 0; | |
541 | u->region_rb[i] = NULL; | |
542 | } | |
543 | } | |
544 | ||
545 | msg->payload.memory.nregions = *fd_num; | |
546 | ||
547 | if (!*fd_num) { | |
548 | error_report("Failed initializing vhost-user memory map, " | |
549 | "consider using -object memory-backend-file share=on"); | |
025faa87 | 550 | return -EINVAL; |
2d9da9df RN |
551 | } |
552 | ||
553 | msg->hdr.size = sizeof(msg->payload.memory.nregions); | |
554 | msg->hdr.size += sizeof(msg->payload.memory.padding); | |
555 | msg->hdr.size += *fd_num * sizeof(VhostUserMemoryRegion); | |
556 | ||
025faa87 | 557 | return 0; |
2d9da9df RN |
558 | } |
559 | ||
f1aeb14b RN |
560 | static inline bool reg_equal(struct vhost_memory_region *shadow_reg, |
561 | struct vhost_memory_region *vdev_reg) | |
562 | { | |
563 | return shadow_reg->guest_phys_addr == vdev_reg->guest_phys_addr && | |
564 | shadow_reg->userspace_addr == vdev_reg->userspace_addr && | |
565 | shadow_reg->memory_size == vdev_reg->memory_size; | |
566 | } | |
567 | ||
568 | static void scrub_shadow_regions(struct vhost_dev *dev, | |
569 | struct scrub_regions *add_reg, | |
570 | int *nr_add_reg, | |
571 | struct scrub_regions *rem_reg, | |
572 | int *nr_rem_reg, uint64_t *shadow_pcb, | |
573 | bool track_ramblocks) | |
574 | { | |
575 | struct vhost_user *u = dev->opaque; | |
27598393 | 576 | bool found[VHOST_USER_MAX_RAM_SLOTS] = {}; |
f1aeb14b RN |
577 | struct vhost_memory_region *reg, *shadow_reg; |
578 | int i, j, fd, add_idx = 0, rm_idx = 0, fd_num = 0; | |
579 | ram_addr_t offset; | |
580 | MemoryRegion *mr; | |
581 | bool matching; | |
582 | ||
583 | /* | |
584 | * Find memory regions present in our shadow state which are not in | |
585 | * the device's current memory state. | |
586 | * | |
587 | * Mark regions in both the shadow and device state as "found". | |
588 | */ | |
589 | for (i = 0; i < u->num_shadow_regions; i++) { | |
590 | shadow_reg = &u->shadow_regions[i]; | |
591 | matching = false; | |
592 | ||
593 | for (j = 0; j < dev->mem->nregions; j++) { | |
594 | reg = &dev->mem->regions[j]; | |
595 | ||
596 | mr = vhost_user_get_mr_data(reg->userspace_addr, &offset, &fd); | |
597 | ||
598 | if (reg_equal(shadow_reg, reg)) { | |
599 | matching = true; | |
600 | found[j] = true; | |
601 | if (track_ramblocks) { | |
602 | /* | |
603 | * Reset postcopy client bases, region_rb, and | |
604 | * region_rb_offset in case regions are removed. | |
605 | */ | |
606 | if (fd > 0) { | |
607 | u->region_rb_offset[j] = offset; | |
608 | u->region_rb[j] = mr->ram_block; | |
609 | shadow_pcb[j] = u->postcopy_client_bases[i]; | |
610 | } else { | |
611 | u->region_rb_offset[j] = 0; | |
612 | u->region_rb[j] = NULL; | |
613 | } | |
614 | } | |
615 | break; | |
616 | } | |
617 | } | |
618 | ||
619 | /* | |
620 | * If the region was not found in the current device memory state | |
621 | * create an entry for it in the removed list. | |
622 | */ | |
623 | if (!matching) { | |
624 | rem_reg[rm_idx].region = shadow_reg; | |
625 | rem_reg[rm_idx++].reg_idx = i; | |
626 | } | |
627 | } | |
628 | ||
629 | /* | |
630 | * For regions not marked "found", create entries in the added list. | |
631 | * | |
632 | * Note their indexes in the device memory state and the indexes of their | |
633 | * file descriptors. | |
634 | */ | |
635 | for (i = 0; i < dev->mem->nregions; i++) { | |
636 | reg = &dev->mem->regions[i]; | |
8b616bee | 637 | vhost_user_get_mr_data(reg->userspace_addr, &offset, &fd); |
f1aeb14b RN |
638 | if (fd > 0) { |
639 | ++fd_num; | |
640 | } | |
641 | ||
642 | /* | |
643 | * If the region was in both the shadow and device state we don't | |
644 | * need to send a VHOST_USER_ADD_MEM_REG message for it. | |
645 | */ | |
646 | if (found[i]) { | |
647 | continue; | |
648 | } | |
649 | ||
650 | add_reg[add_idx].region = reg; | |
651 | add_reg[add_idx].reg_idx = i; | |
652 | add_reg[add_idx++].fd_idx = fd_num; | |
653 | } | |
654 | *nr_rem_reg = rm_idx; | |
655 | *nr_add_reg = add_idx; | |
656 | ||
657 | return; | |
658 | } | |
659 | ||
660 | static int send_remove_regions(struct vhost_dev *dev, | |
661 | struct scrub_regions *remove_reg, | |
662 | int nr_rem_reg, VhostUserMsg *msg, | |
663 | bool reply_supported) | |
664 | { | |
665 | struct vhost_user *u = dev->opaque; | |
666 | struct vhost_memory_region *shadow_reg; | |
667 | int i, fd, shadow_reg_idx, ret; | |
668 | ram_addr_t offset; | |
669 | VhostUserMemoryRegion region_buffer; | |
670 | ||
671 | /* | |
672 | * The regions in remove_reg appear in the same order they do in the | |
673 | * shadow table. Therefore we can minimize memory copies by iterating | |
674 | * through remove_reg backwards. | |
675 | */ | |
676 | for (i = nr_rem_reg - 1; i >= 0; i--) { | |
677 | shadow_reg = remove_reg[i].region; | |
678 | shadow_reg_idx = remove_reg[i].reg_idx; | |
679 | ||
680 | vhost_user_get_mr_data(shadow_reg->userspace_addr, &offset, &fd); | |
681 | ||
682 | if (fd > 0) { | |
683 | msg->hdr.request = VHOST_USER_REM_MEM_REG; | |
8d193715 | 684 | vhost_user_fill_msg_region(®ion_buffer, shadow_reg, 0); |
f1aeb14b RN |
685 | msg->payload.mem_reg.region = region_buffer; |
686 | ||
a81d8d4a | 687 | ret = vhost_user_write(dev, msg, NULL, 0); |
025faa87 RK |
688 | if (ret < 0) { |
689 | return ret; | |
f1aeb14b RN |
690 | } |
691 | ||
692 | if (reply_supported) { | |
693 | ret = process_message_reply(dev, msg); | |
694 | if (ret) { | |
695 | return ret; | |
696 | } | |
697 | } | |
698 | } | |
699 | ||
700 | /* | |
701 | * At this point we know the backend has unmapped the region. It is now | |
702 | * safe to remove it from the shadow table. | |
703 | */ | |
704 | memmove(&u->shadow_regions[shadow_reg_idx], | |
705 | &u->shadow_regions[shadow_reg_idx + 1], | |
706 | sizeof(struct vhost_memory_region) * | |
4fdecf05 | 707 | (u->num_shadow_regions - shadow_reg_idx - 1)); |
f1aeb14b RN |
708 | u->num_shadow_regions--; |
709 | } | |
710 | ||
711 | return 0; | |
712 | } | |
713 | ||
714 | static int send_add_regions(struct vhost_dev *dev, | |
715 | struct scrub_regions *add_reg, int nr_add_reg, | |
716 | VhostUserMsg *msg, uint64_t *shadow_pcb, | |
717 | bool reply_supported, bool track_ramblocks) | |
718 | { | |
719 | struct vhost_user *u = dev->opaque; | |
720 | int i, fd, ret, reg_idx, reg_fd_idx; | |
721 | struct vhost_memory_region *reg; | |
722 | MemoryRegion *mr; | |
723 | ram_addr_t offset; | |
724 | VhostUserMsg msg_reply; | |
725 | VhostUserMemoryRegion region_buffer; | |
726 | ||
727 | for (i = 0; i < nr_add_reg; i++) { | |
728 | reg = add_reg[i].region; | |
729 | reg_idx = add_reg[i].reg_idx; | |
730 | reg_fd_idx = add_reg[i].fd_idx; | |
731 | ||
732 | mr = vhost_user_get_mr_data(reg->userspace_addr, &offset, &fd); | |
733 | ||
734 | if (fd > 0) { | |
735 | if (track_ramblocks) { | |
736 | trace_vhost_user_set_mem_table_withfd(reg_fd_idx, mr->name, | |
737 | reg->memory_size, | |
738 | reg->guest_phys_addr, | |
739 | reg->userspace_addr, | |
740 | offset); | |
741 | u->region_rb_offset[reg_idx] = offset; | |
742 | u->region_rb[reg_idx] = mr->ram_block; | |
743 | } | |
744 | msg->hdr.request = VHOST_USER_ADD_MEM_REG; | |
8d193715 | 745 | vhost_user_fill_msg_region(®ion_buffer, reg, offset); |
f1aeb14b | 746 | msg->payload.mem_reg.region = region_buffer; |
f1aeb14b | 747 | |
025faa87 RK |
748 | ret = vhost_user_write(dev, msg, &fd, 1); |
749 | if (ret < 0) { | |
750 | return ret; | |
f1aeb14b RN |
751 | } |
752 | ||
753 | if (track_ramblocks) { | |
754 | uint64_t reply_gpa; | |
755 | ||
025faa87 RK |
756 | ret = vhost_user_read(dev, &msg_reply); |
757 | if (ret < 0) { | |
758 | return ret; | |
f1aeb14b RN |
759 | } |
760 | ||
761 | reply_gpa = msg_reply.payload.mem_reg.region.guest_phys_addr; | |
762 | ||
763 | if (msg_reply.hdr.request != VHOST_USER_ADD_MEM_REG) { | |
764 | error_report("%s: Received unexpected msg type." | |
765 | "Expected %d received %d", __func__, | |
766 | VHOST_USER_ADD_MEM_REG, | |
767 | msg_reply.hdr.request); | |
025faa87 | 768 | return -EPROTO; |
f1aeb14b RN |
769 | } |
770 | ||
771 | /* | |
772 | * We're using the same structure, just reusing one of the | |
773 | * fields, so it should be the same size. | |
774 | */ | |
775 | if (msg_reply.hdr.size != msg->hdr.size) { | |
776 | error_report("%s: Unexpected size for postcopy reply " | |
777 | "%d vs %d", __func__, msg_reply.hdr.size, | |
778 | msg->hdr.size); | |
025faa87 | 779 | return -EPROTO; |
f1aeb14b RN |
780 | } |
781 | ||
782 | /* Get the postcopy client base from the backend's reply. */ | |
783 | if (reply_gpa == dev->mem->regions[reg_idx].guest_phys_addr) { | |
784 | shadow_pcb[reg_idx] = | |
785 | msg_reply.payload.mem_reg.region.userspace_addr; | |
786 | trace_vhost_user_set_mem_table_postcopy( | |
787 | msg_reply.payload.mem_reg.region.userspace_addr, | |
788 | msg->payload.mem_reg.region.userspace_addr, | |
789 | reg_fd_idx, reg_idx); | |
790 | } else { | |
791 | error_report("%s: invalid postcopy reply for region. " | |
792 | "Got guest physical address %" PRIX64 ", expected " | |
793 | "%" PRIX64, __func__, reply_gpa, | |
794 | dev->mem->regions[reg_idx].guest_phys_addr); | |
025faa87 | 795 | return -EPROTO; |
f1aeb14b RN |
796 | } |
797 | } else if (reply_supported) { | |
798 | ret = process_message_reply(dev, msg); | |
799 | if (ret) { | |
800 | return ret; | |
801 | } | |
802 | } | |
803 | } else if (track_ramblocks) { | |
804 | u->region_rb_offset[reg_idx] = 0; | |
805 | u->region_rb[reg_idx] = NULL; | |
806 | } | |
807 | ||
808 | /* | |
809 | * At this point, we know the backend has mapped in the new | |
810 | * region, if the region has a valid file descriptor. | |
811 | * | |
812 | * The region should now be added to the shadow table. | |
813 | */ | |
814 | u->shadow_regions[u->num_shadow_regions].guest_phys_addr = | |
815 | reg->guest_phys_addr; | |
816 | u->shadow_regions[u->num_shadow_regions].userspace_addr = | |
817 | reg->userspace_addr; | |
818 | u->shadow_regions[u->num_shadow_regions].memory_size = | |
819 | reg->memory_size; | |
820 | u->num_shadow_regions++; | |
821 | } | |
822 | ||
823 | return 0; | |
824 | } | |
825 | ||
826 | static int vhost_user_add_remove_regions(struct vhost_dev *dev, | |
827 | VhostUserMsg *msg, | |
828 | bool reply_supported, | |
829 | bool track_ramblocks) | |
830 | { | |
831 | struct vhost_user *u = dev->opaque; | |
27598393 RN |
832 | struct scrub_regions add_reg[VHOST_USER_MAX_RAM_SLOTS]; |
833 | struct scrub_regions rem_reg[VHOST_USER_MAX_RAM_SLOTS]; | |
834 | uint64_t shadow_pcb[VHOST_USER_MAX_RAM_SLOTS] = {}; | |
f1aeb14b | 835 | int nr_add_reg, nr_rem_reg; |
025faa87 | 836 | int ret; |
f1aeb14b | 837 | |
3009edff | 838 | msg->hdr.size = sizeof(msg->payload.mem_reg); |
f1aeb14b RN |
839 | |
840 | /* Find the regions which need to be removed or added. */ | |
841 | scrub_shadow_regions(dev, add_reg, &nr_add_reg, rem_reg, &nr_rem_reg, | |
842 | shadow_pcb, track_ramblocks); | |
843 | ||
025faa87 RK |
844 | if (nr_rem_reg) { |
845 | ret = send_remove_regions(dev, rem_reg, nr_rem_reg, msg, | |
846 | reply_supported); | |
847 | if (ret < 0) { | |
848 | goto err; | |
849 | } | |
f1aeb14b RN |
850 | } |
851 | ||
025faa87 RK |
852 | if (nr_add_reg) { |
853 | ret = send_add_regions(dev, add_reg, nr_add_reg, msg, shadow_pcb, | |
854 | reply_supported, track_ramblocks); | |
855 | if (ret < 0) { | |
856 | goto err; | |
857 | } | |
f1aeb14b RN |
858 | } |
859 | ||
860 | if (track_ramblocks) { | |
861 | memcpy(u->postcopy_client_bases, shadow_pcb, | |
27598393 | 862 | sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); |
f1aeb14b RN |
863 | /* |
864 | * Now we've registered this with the postcopy code, we ack to the | |
865 | * client, because now we're in the position to be able to deal with | |
866 | * any faults it generates. | |
867 | */ | |
868 | /* TODO: Use this for failure cases as well with a bad value. */ | |
869 | msg->hdr.size = sizeof(msg->payload.u64); | |
870 | msg->payload.u64 = 0; /* OK */ | |
871 | ||
025faa87 RK |
872 | ret = vhost_user_write(dev, msg, NULL, 0); |
873 | if (ret < 0) { | |
874 | return ret; | |
f1aeb14b RN |
875 | } |
876 | } | |
877 | ||
878 | return 0; | |
879 | ||
880 | err: | |
881 | if (track_ramblocks) { | |
882 | memcpy(u->postcopy_client_bases, shadow_pcb, | |
27598393 | 883 | sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); |
f1aeb14b RN |
884 | } |
885 | ||
025faa87 | 886 | return ret; |
f1aeb14b RN |
887 | } |
888 | ||
55d754b3 | 889 | static int vhost_user_set_mem_table_postcopy(struct vhost_dev *dev, |
f1aeb14b RN |
890 | struct vhost_memory *mem, |
891 | bool reply_supported, | |
892 | bool config_mem_slots) | |
55d754b3 | 893 | { |
9bb38019 | 894 | struct vhost_user *u = dev->opaque; |
27598393 | 895 | int fds[VHOST_MEMORY_BASELINE_NREGIONS]; |
55d754b3 | 896 | size_t fd_num = 0; |
9bb38019 DDAG |
897 | VhostUserMsg msg_reply; |
898 | int region_i, msg_i; | |
025faa87 | 899 | int ret; |
9bb38019 | 900 | |
55d754b3 | 901 | VhostUserMsg msg = { |
55d754b3 DDAG |
902 | .hdr.flags = VHOST_USER_VERSION, |
903 | }; | |
904 | ||
905125d0 DDAG |
905 | if (u->region_rb_len < dev->mem->nregions) { |
906 | u->region_rb = g_renew(RAMBlock*, u->region_rb, dev->mem->nregions); | |
907 | u->region_rb_offset = g_renew(ram_addr_t, u->region_rb_offset, | |
908 | dev->mem->nregions); | |
909 | memset(&(u->region_rb[u->region_rb_len]), '\0', | |
910 | sizeof(RAMBlock *) * (dev->mem->nregions - u->region_rb_len)); | |
911 | memset(&(u->region_rb_offset[u->region_rb_len]), '\0', | |
912 | sizeof(ram_addr_t) * (dev->mem->nregions - u->region_rb_len)); | |
913 | u->region_rb_len = dev->mem->nregions; | |
914 | } | |
915 | ||
f1aeb14b | 916 | if (config_mem_slots) { |
025faa87 RK |
917 | ret = vhost_user_add_remove_regions(dev, &msg, reply_supported, true); |
918 | if (ret < 0) { | |
919 | return ret; | |
f1aeb14b RN |
920 | } |
921 | } else { | |
025faa87 RK |
922 | ret = vhost_user_fill_set_mem_table_msg(u, dev, &msg, fds, &fd_num, |
923 | true); | |
924 | if (ret < 0) { | |
925 | return ret; | |
f1aeb14b | 926 | } |
55d754b3 | 927 | |
025faa87 RK |
928 | ret = vhost_user_write(dev, &msg, fds, fd_num); |
929 | if (ret < 0) { | |
930 | return ret; | |
f1aeb14b | 931 | } |
55d754b3 | 932 | |
025faa87 RK |
933 | ret = vhost_user_read(dev, &msg_reply); |
934 | if (ret < 0) { | |
935 | return ret; | |
f1aeb14b | 936 | } |
9bb38019 | 937 | |
f1aeb14b RN |
938 | if (msg_reply.hdr.request != VHOST_USER_SET_MEM_TABLE) { |
939 | error_report("%s: Received unexpected msg type." | |
940 | "Expected %d received %d", __func__, | |
941 | VHOST_USER_SET_MEM_TABLE, msg_reply.hdr.request); | |
025faa87 | 942 | return -EPROTO; |
f1aeb14b | 943 | } |
9bb38019 | 944 | |
f1aeb14b RN |
945 | /* |
946 | * We're using the same structure, just reusing one of the | |
947 | * fields, so it should be the same size. | |
948 | */ | |
949 | if (msg_reply.hdr.size != msg.hdr.size) { | |
950 | error_report("%s: Unexpected size for postcopy reply " | |
951 | "%d vs %d", __func__, msg_reply.hdr.size, | |
952 | msg.hdr.size); | |
025faa87 | 953 | return -EPROTO; |
f1aeb14b RN |
954 | } |
955 | ||
956 | memset(u->postcopy_client_bases, 0, | |
27598393 | 957 | sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); |
f1aeb14b RN |
958 | |
959 | /* | |
960 | * They're in the same order as the regions that were sent | |
961 | * but some of the regions were skipped (above) if they | |
962 | * didn't have fd's | |
963 | */ | |
964 | for (msg_i = 0, region_i = 0; | |
965 | region_i < dev->mem->nregions; | |
966 | region_i++) { | |
967 | if (msg_i < fd_num && | |
968 | msg_reply.payload.memory.regions[msg_i].guest_phys_addr == | |
969 | dev->mem->regions[region_i].guest_phys_addr) { | |
970 | u->postcopy_client_bases[region_i] = | |
971 | msg_reply.payload.memory.regions[msg_i].userspace_addr; | |
972 | trace_vhost_user_set_mem_table_postcopy( | |
973 | msg_reply.payload.memory.regions[msg_i].userspace_addr, | |
974 | msg.payload.memory.regions[msg_i].userspace_addr, | |
975 | msg_i, region_i); | |
976 | msg_i++; | |
977 | } | |
978 | } | |
979 | if (msg_i != fd_num) { | |
980 | error_report("%s: postcopy reply not fully consumed " | |
981 | "%d vs %zd", | |
982 | __func__, msg_i, fd_num); | |
025faa87 | 983 | return -EIO; |
f1aeb14b RN |
984 | } |
985 | ||
986 | /* | |
987 | * Now we've registered this with the postcopy code, we ack to the | |
988 | * client, because now we're in the position to be able to deal | |
989 | * with any faults it generates. | |
990 | */ | |
991 | /* TODO: Use this for failure cases as well with a bad value. */ | |
992 | msg.hdr.size = sizeof(msg.payload.u64); | |
993 | msg.payload.u64 = 0; /* OK */ | |
025faa87 RK |
994 | ret = vhost_user_write(dev, &msg, NULL, 0); |
995 | if (ret < 0) { | |
996 | return ret; | |
9bb38019 | 997 | } |
9bb38019 DDAG |
998 | } |
999 | ||
55d754b3 DDAG |
1000 | return 0; |
1001 | } | |
1002 | ||
94c9cb31 MT |
1003 | static int vhost_user_set_mem_table(struct vhost_dev *dev, |
1004 | struct vhost_memory *mem) | |
1005 | { | |
55d754b3 | 1006 | struct vhost_user *u = dev->opaque; |
27598393 | 1007 | int fds[VHOST_MEMORY_BASELINE_NREGIONS]; |
94c9cb31 | 1008 | size_t fd_num = 0; |
55d754b3 | 1009 | bool do_postcopy = u->postcopy_listen && u->postcopy_fd.handler; |
94c9cb31 | 1010 | bool reply_supported = virtio_has_feature(dev->protocol_features, |
5ce43896 | 1011 | VHOST_USER_PROTOCOL_F_REPLY_ACK); |
f1aeb14b RN |
1012 | bool config_mem_slots = |
1013 | virtio_has_feature(dev->protocol_features, | |
1014 | VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS); | |
025faa87 | 1015 | int ret; |
94c9cb31 | 1016 | |
55d754b3 | 1017 | if (do_postcopy) { |
f1aeb14b RN |
1018 | /* |
1019 | * Postcopy has enough differences that it's best done in it's own | |
55d754b3 DDAG |
1020 | * version |
1021 | */ | |
f1aeb14b RN |
1022 | return vhost_user_set_mem_table_postcopy(dev, mem, reply_supported, |
1023 | config_mem_slots); | |
55d754b3 DDAG |
1024 | } |
1025 | ||
94c9cb31 | 1026 | VhostUserMsg msg = { |
24e34754 | 1027 | .hdr.flags = VHOST_USER_VERSION, |
94c9cb31 MT |
1028 | }; |
1029 | ||
1030 | if (reply_supported) { | |
24e34754 | 1031 | msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; |
94c9cb31 MT |
1032 | } |
1033 | ||
f1aeb14b | 1034 | if (config_mem_slots) { |
025faa87 RK |
1035 | ret = vhost_user_add_remove_regions(dev, &msg, reply_supported, false); |
1036 | if (ret < 0) { | |
1037 | return ret; | |
f1aeb14b RN |
1038 | } |
1039 | } else { | |
025faa87 RK |
1040 | ret = vhost_user_fill_set_mem_table_msg(u, dev, &msg, fds, &fd_num, |
1041 | false); | |
1042 | if (ret < 0) { | |
1043 | return ret; | |
f1aeb14b | 1044 | } |
025faa87 RK |
1045 | |
1046 | ret = vhost_user_write(dev, &msg, fds, fd_num); | |
1047 | if (ret < 0) { | |
1048 | return ret; | |
f1aeb14b | 1049 | } |
94c9cb31 | 1050 | |
f1aeb14b RN |
1051 | if (reply_supported) { |
1052 | return process_message_reply(dev, &msg); | |
1053 | } | |
94c9cb31 MT |
1054 | } |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | ||
21e70425 MAL |
1059 | static int vhost_user_set_vring_endian(struct vhost_dev *dev, |
1060 | struct vhost_vring_state *ring) | |
1061 | { | |
5df04f17 FF |
1062 | bool cross_endian = virtio_has_feature(dev->protocol_features, |
1063 | VHOST_USER_PROTOCOL_F_CROSS_ENDIAN); | |
1064 | VhostUserMsg msg = { | |
24e34754 MT |
1065 | .hdr.request = VHOST_USER_SET_VRING_ENDIAN, |
1066 | .hdr.flags = VHOST_USER_VERSION, | |
5df04f17 | 1067 | .payload.state = *ring, |
24e34754 | 1068 | .hdr.size = sizeof(msg.payload.state), |
5df04f17 FF |
1069 | }; |
1070 | ||
1071 | if (!cross_endian) { | |
1072 | error_report("vhost-user trying to send unhandled ioctl"); | |
025faa87 | 1073 | return -ENOTSUP; |
5df04f17 FF |
1074 | } |
1075 | ||
025faa87 | 1076 | return vhost_user_write(dev, &msg, NULL, 0); |
21e70425 | 1077 | } |
5f6f6664 | 1078 | |
df3b2abc LE |
1079 | static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t *u64) |
1080 | { | |
1081 | int ret; | |
1082 | VhostUserMsg msg = { | |
1083 | .hdr.request = request, | |
1084 | .hdr.flags = VHOST_USER_VERSION, | |
1085 | }; | |
1086 | ||
1087 | if (vhost_user_per_device_request(request) && dev->vq_index != 0) { | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | ret = vhost_user_write(dev, &msg, NULL, 0); | |
1092 | if (ret < 0) { | |
1093 | return ret; | |
1094 | } | |
1095 | ||
1096 | ret = vhost_user_read(dev, &msg); | |
1097 | if (ret < 0) { | |
1098 | return ret; | |
1099 | } | |
1100 | ||
1101 | if (msg.hdr.request != request) { | |
1102 | error_report("Received unexpected msg type. Expected %d received %d", | |
1103 | request, msg.hdr.request); | |
1104 | return -EPROTO; | |
1105 | } | |
1106 | ||
1107 | if (msg.hdr.size != sizeof(msg.payload.u64)) { | |
1108 | error_report("Received bad msg size."); | |
1109 | return -EPROTO; | |
1110 | } | |
1111 | ||
1112 | *u64 = msg.payload.u64; | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | static int vhost_user_get_features(struct vhost_dev *dev, uint64_t *features) | |
1118 | { | |
1119 | if (vhost_user_get_u64(dev, VHOST_USER_GET_FEATURES, features) < 0) { | |
1120 | return -EPROTO; | |
1121 | } | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | /* Note: "msg->hdr.flags" may be modified. */ | |
1127 | static int vhost_user_write_sync(struct vhost_dev *dev, VhostUserMsg *msg, | |
1128 | bool wait_for_reply) | |
1129 | { | |
1130 | int ret; | |
1131 | ||
1132 | if (wait_for_reply) { | |
1133 | bool reply_supported = virtio_has_feature(dev->protocol_features, | |
1134 | VHOST_USER_PROTOCOL_F_REPLY_ACK); | |
1135 | if (reply_supported) { | |
1136 | msg->hdr.flags |= VHOST_USER_NEED_REPLY_MASK; | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | ret = vhost_user_write(dev, msg, NULL, 0); | |
1141 | if (ret < 0) { | |
1142 | return ret; | |
1143 | } | |
1144 | ||
1145 | if (wait_for_reply) { | |
1146 | uint64_t dummy; | |
1147 | ||
1148 | if (msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) { | |
1149 | return process_message_reply(dev, msg); | |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * We need to wait for a reply but the backend does not | |
1154 | * support replies for the command we just sent. | |
1155 | * Send VHOST_USER_GET_FEATURES which makes all backends | |
1156 | * send a reply. | |
1157 | */ | |
1158 | return vhost_user_get_features(dev, &dummy); | |
1159 | } | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
21e70425 MAL |
1164 | static int vhost_set_vring(struct vhost_dev *dev, |
1165 | unsigned long int request, | |
75b6b6da LE |
1166 | struct vhost_vring_state *ring, |
1167 | bool wait_for_reply) | |
21e70425 MAL |
1168 | { |
1169 | VhostUserMsg msg = { | |
24e34754 MT |
1170 | .hdr.request = request, |
1171 | .hdr.flags = VHOST_USER_VERSION, | |
7f4a930e | 1172 | .payload.state = *ring, |
24e34754 | 1173 | .hdr.size = sizeof(msg.payload.state), |
21e70425 MAL |
1174 | }; |
1175 | ||
75b6b6da | 1176 | return vhost_user_write_sync(dev, &msg, wait_for_reply); |
21e70425 MAL |
1177 | } |
1178 | ||
1179 | static int vhost_user_set_vring_num(struct vhost_dev *dev, | |
1180 | struct vhost_vring_state *ring) | |
1181 | { | |
75b6b6da | 1182 | return vhost_set_vring(dev, VHOST_USER_SET_VRING_NUM, ring, false); |
21e70425 MAL |
1183 | } |
1184 | ||
0b0af4d6 | 1185 | static void vhost_user_host_notifier_free(VhostUserHostNotifier *n) |
44866521 | 1186 | { |
0b0af4d6 | 1187 | assert(n && n->unmap_addr); |
8e3b0cbb | 1188 | munmap(n->unmap_addr, qemu_real_host_page_size()); |
0b0af4d6 XL |
1189 | n->unmap_addr = NULL; |
1190 | } | |
1191 | ||
503e3554 AB |
1192 | /* |
1193 | * clean-up function for notifier, will finally free the structure | |
1194 | * under rcu. | |
1195 | */ | |
1196 | static void vhost_user_host_notifier_remove(VhostUserHostNotifier *n, | |
1197 | VirtIODevice *vdev) | |
0b0af4d6 | 1198 | { |
e867144b | 1199 | if (n->addr) { |
0b0af4d6 | 1200 | if (vdev) { |
503e3554 | 1201 | virtio_queue_set_host_notifier_mr(vdev, n->idx, &n->mr, false); |
0b0af4d6 XL |
1202 | } |
1203 | assert(!n->unmap_addr); | |
1204 | n->unmap_addr = n->addr; | |
1205 | n->addr = NULL; | |
1206 | call_rcu(n, vhost_user_host_notifier_free, rcu); | |
44866521 TB |
1207 | } |
1208 | } | |
1209 | ||
21e70425 MAL |
1210 | static int vhost_user_set_vring_base(struct vhost_dev *dev, |
1211 | struct vhost_vring_state *ring) | |
1212 | { | |
75b6b6da | 1213 | return vhost_set_vring(dev, VHOST_USER_SET_VRING_BASE, ring, false); |
21e70425 MAL |
1214 | } |
1215 | ||
1216 | static int vhost_user_set_vring_enable(struct vhost_dev *dev, int enable) | |
1217 | { | |
dc3db6ad | 1218 | int i; |
21e70425 | 1219 | |
923e2d98 | 1220 | if (!virtio_has_feature(dev->features, VHOST_USER_F_PROTOCOL_FEATURES)) { |
025faa87 | 1221 | return -EINVAL; |
5f6f6664 NN |
1222 | } |
1223 | ||
dc3db6ad | 1224 | for (i = 0; i < dev->nvqs; ++i) { |
025faa87 | 1225 | int ret; |
dc3db6ad MT |
1226 | struct vhost_vring_state state = { |
1227 | .index = dev->vq_index + i, | |
1228 | .num = enable, | |
1229 | }; | |
1230 | ||
d7dc0682 LE |
1231 | /* |
1232 | * SET_VRING_ENABLE travels from guest to QEMU to vhost-user backend / | |
1233 | * control plane thread via unix domain socket. Virtio requests travel | |
1234 | * from guest to vhost-user backend / data plane thread via eventfd. | |
1235 | * Even if the guest enables the ring first, and pushes its first virtio | |
1236 | * request second (conforming to the virtio spec), the data plane thread | |
1237 | * in the backend may see the virtio request before the control plane | |
1238 | * thread sees the queue enablement. This causes (in fact, requires) the | |
1239 | * data plane thread to discard the virtio request (it arrived on a | |
1240 | * seemingly disabled queue). To prevent this out-of-order delivery, | |
1241 | * don't let the guest proceed to pushing the virtio request until the | |
1242 | * backend control plane acknowledges enabling the queue -- IOW, pass | |
1243 | * wait_for_reply=true below. | |
1244 | */ | |
1245 | ret = vhost_set_vring(dev, VHOST_USER_SET_VRING_ENABLE, &state, true); | |
025faa87 RK |
1246 | if (ret < 0) { |
1247 | /* | |
1248 | * Restoring the previous state is likely infeasible, as well as | |
1249 | * proceeding regardless the error, so just bail out and hope for | |
1250 | * the device-level recovery. | |
1251 | */ | |
1252 | return ret; | |
1253 | } | |
dc3db6ad | 1254 | } |
21e70425 | 1255 | |
dc3db6ad MT |
1256 | return 0; |
1257 | } | |
21e70425 | 1258 | |
503e3554 AB |
1259 | static VhostUserHostNotifier *fetch_notifier(VhostUserState *u, |
1260 | int idx) | |
1261 | { | |
1262 | if (idx >= u->notifiers->len) { | |
1263 | return NULL; | |
1264 | } | |
1265 | return g_ptr_array_index(u->notifiers, idx); | |
1266 | } | |
1267 | ||
21e70425 MAL |
1268 | static int vhost_user_get_vring_base(struct vhost_dev *dev, |
1269 | struct vhost_vring_state *ring) | |
1270 | { | |
025faa87 | 1271 | int ret; |
21e70425 | 1272 | VhostUserMsg msg = { |
24e34754 MT |
1273 | .hdr.request = VHOST_USER_GET_VRING_BASE, |
1274 | .hdr.flags = VHOST_USER_VERSION, | |
7f4a930e | 1275 | .payload.state = *ring, |
24e34754 | 1276 | .hdr.size = sizeof(msg.payload.state), |
21e70425 | 1277 | }; |
0b0af4d6 | 1278 | struct vhost_user *u = dev->opaque; |
21e70425 | 1279 | |
503e3554 AB |
1280 | VhostUserHostNotifier *n = fetch_notifier(u->user, ring->index); |
1281 | if (n) { | |
1282 | vhost_user_host_notifier_remove(n, dev->vdev); | |
1283 | } | |
44866521 | 1284 | |
025faa87 RK |
1285 | ret = vhost_user_write(dev, &msg, NULL, 0); |
1286 | if (ret < 0) { | |
1287 | return ret; | |
c4843a45 | 1288 | } |
21e70425 | 1289 | |
025faa87 RK |
1290 | ret = vhost_user_read(dev, &msg); |
1291 | if (ret < 0) { | |
1292 | return ret; | |
5f6f6664 NN |
1293 | } |
1294 | ||
24e34754 | 1295 | if (msg.hdr.request != VHOST_USER_GET_VRING_BASE) { |
21e70425 | 1296 | error_report("Received unexpected msg type. Expected %d received %d", |
24e34754 | 1297 | VHOST_USER_GET_VRING_BASE, msg.hdr.request); |
025faa87 | 1298 | return -EPROTO; |
21e70425 | 1299 | } |
5f6f6664 | 1300 | |
24e34754 | 1301 | if (msg.hdr.size != sizeof(msg.payload.state)) { |
21e70425 | 1302 | error_report("Received bad msg size."); |
025faa87 | 1303 | return -EPROTO; |
5f6f6664 NN |
1304 | } |
1305 | ||
7f4a930e | 1306 | *ring = msg.payload.state; |
21e70425 | 1307 | |
5f6f6664 NN |
1308 | return 0; |
1309 | } | |
1310 | ||
21e70425 MAL |
1311 | static int vhost_set_vring_file(struct vhost_dev *dev, |
1312 | VhostUserRequest request, | |
1313 | struct vhost_vring_file *file) | |
c2bea314 | 1314 | { |
27598393 | 1315 | int fds[VHOST_USER_MAX_RAM_SLOTS]; |
9a78a5dd | 1316 | size_t fd_num = 0; |
c2bea314 | 1317 | VhostUserMsg msg = { |
24e34754 MT |
1318 | .hdr.request = request, |
1319 | .hdr.flags = VHOST_USER_VERSION, | |
7f4a930e | 1320 | .payload.u64 = file->index & VHOST_USER_VRING_IDX_MASK, |
24e34754 | 1321 | .hdr.size = sizeof(msg.payload.u64), |
c2bea314 MAL |
1322 | }; |
1323 | ||
126e7f78 | 1324 | if (file->fd > 0) { |
21e70425 MAL |
1325 | fds[fd_num++] = file->fd; |
1326 | } else { | |
7f4a930e | 1327 | msg.payload.u64 |= VHOST_USER_VRING_NOFD_MASK; |
9a78a5dd MAL |
1328 | } |
1329 | ||
025faa87 | 1330 | return vhost_user_write(dev, &msg, fds, fd_num); |
21e70425 | 1331 | } |
9a78a5dd | 1332 | |
21e70425 MAL |
1333 | static int vhost_user_set_vring_kick(struct vhost_dev *dev, |
1334 | struct vhost_vring_file *file) | |
1335 | { | |
1336 | return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_KICK, file); | |
1337 | } | |
1338 | ||
1339 | static int vhost_user_set_vring_call(struct vhost_dev *dev, | |
1340 | struct vhost_vring_file *file) | |
1341 | { | |
1342 | return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_CALL, file); | |
1343 | } | |
1344 | ||
60dc3c5b KK |
1345 | static int vhost_user_set_vring_err(struct vhost_dev *dev, |
1346 | struct vhost_vring_file *file) | |
1347 | { | |
1348 | return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_ERR, file); | |
1349 | } | |
21e70425 | 1350 | |
54ae3682 LE |
1351 | static int vhost_user_set_vring_addr(struct vhost_dev *dev, |
1352 | struct vhost_vring_addr *addr) | |
1353 | { | |
1354 | VhostUserMsg msg = { | |
1355 | .hdr.request = VHOST_USER_SET_VRING_ADDR, | |
1356 | .hdr.flags = VHOST_USER_VERSION, | |
1357 | .payload.addr = *addr, | |
1358 | .hdr.size = sizeof(msg.payload.addr), | |
1359 | }; | |
1360 | ||
1361 | /* | |
1362 | * wait for a reply if logging is enabled to make sure | |
1363 | * backend is actually logging changes | |
1364 | */ | |
1365 | bool wait_for_reply = addr->flags & (1 << VHOST_VRING_F_LOG); | |
1366 | ||
1367 | return vhost_user_write_sync(dev, &msg, wait_for_reply); | |
1368 | } | |
1369 | ||
699f2e53 DP |
1370 | static int vhost_user_set_u64(struct vhost_dev *dev, int request, uint64_t u64, |
1371 | bool wait_for_reply) | |
1372 | { | |
1373 | VhostUserMsg msg = { | |
1374 | .hdr.request = request, | |
1375 | .hdr.flags = VHOST_USER_VERSION, | |
1376 | .payload.u64 = u64, | |
1377 | .hdr.size = sizeof(msg.payload.u64), | |
1378 | }; | |
1379 | ||
54ae3682 | 1380 | return vhost_user_write_sync(dev, &msg, wait_for_reply); |
699f2e53 DP |
1381 | } |
1382 | ||
923b8921 YW |
1383 | static int vhost_user_set_status(struct vhost_dev *dev, uint8_t status) |
1384 | { | |
1385 | return vhost_user_set_u64(dev, VHOST_USER_SET_STATUS, status, false); | |
1386 | } | |
1387 | ||
1388 | static int vhost_user_get_status(struct vhost_dev *dev, uint8_t *status) | |
1389 | { | |
1390 | uint64_t value; | |
1391 | int ret; | |
1392 | ||
1393 | ret = vhost_user_get_u64(dev, VHOST_USER_GET_STATUS, &value); | |
1394 | if (ret < 0) { | |
1395 | return ret; | |
1396 | } | |
1397 | *status = value; | |
1398 | ||
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | static int vhost_user_add_status(struct vhost_dev *dev, uint8_t status) | |
1403 | { | |
1404 | uint8_t s; | |
1405 | int ret; | |
1406 | ||
1407 | ret = vhost_user_get_status(dev, &s); | |
1408 | if (ret < 0) { | |
1409 | return ret; | |
1410 | } | |
1411 | ||
1412 | if ((s & status) == status) { | |
1413 | return 0; | |
1414 | } | |
1415 | s |= status; | |
1416 | ||
1417 | return vhost_user_set_status(dev, s); | |
1418 | } | |
1419 | ||
699f2e53 DP |
1420 | static int vhost_user_set_features(struct vhost_dev *dev, |
1421 | uint64_t features) | |
1422 | { | |
1423 | /* | |
1424 | * wait for a reply if logging is enabled to make sure | |
1425 | * backend is actually logging changes | |
1426 | */ | |
1427 | bool log_enabled = features & (0x1ULL << VHOST_F_LOG_ALL); | |
923b8921 | 1428 | int ret; |
699f2e53 | 1429 | |
02b61f38 AB |
1430 | /* |
1431 | * We need to include any extra backend only feature bits that | |
1432 | * might be needed by our device. Currently this includes the | |
1433 | * VHOST_USER_F_PROTOCOL_FEATURES bit for enabling protocol | |
1434 | * features. | |
1435 | */ | |
923b8921 | 1436 | ret = vhost_user_set_u64(dev, VHOST_USER_SET_FEATURES, |
02b61f38 | 1437 | features | dev->backend_features, |
699f2e53 | 1438 | log_enabled); |
923b8921 YW |
1439 | |
1440 | if (virtio_has_feature(dev->protocol_features, | |
1441 | VHOST_USER_PROTOCOL_F_STATUS)) { | |
1442 | if (!ret) { | |
1443 | return vhost_user_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK); | |
1444 | } | |
1445 | } | |
1446 | ||
1447 | return ret; | |
699f2e53 DP |
1448 | } |
1449 | ||
1450 | static int vhost_user_set_protocol_features(struct vhost_dev *dev, | |
1451 | uint64_t features) | |
1452 | { | |
1453 | return vhost_user_set_u64(dev, VHOST_USER_SET_PROTOCOL_FEATURES, features, | |
1454 | false); | |
1455 | } | |
1456 | ||
21e70425 MAL |
1457 | static int vhost_user_set_owner(struct vhost_dev *dev) |
1458 | { | |
1459 | VhostUserMsg msg = { | |
24e34754 MT |
1460 | .hdr.request = VHOST_USER_SET_OWNER, |
1461 | .hdr.flags = VHOST_USER_VERSION, | |
21e70425 MAL |
1462 | }; |
1463 | ||
025faa87 | 1464 | return vhost_user_write(dev, &msg, NULL, 0); |
21e70425 MAL |
1465 | } |
1466 | ||
6b0eff1a RN |
1467 | static int vhost_user_get_max_memslots(struct vhost_dev *dev, |
1468 | uint64_t *max_memslots) | |
1469 | { | |
1470 | uint64_t backend_max_memslots; | |
1471 | int err; | |
1472 | ||
1473 | err = vhost_user_get_u64(dev, VHOST_USER_GET_MAX_MEM_SLOTS, | |
1474 | &backend_max_memslots); | |
1475 | if (err < 0) { | |
1476 | return err; | |
1477 | } | |
1478 | ||
1479 | *max_memslots = backend_max_memslots; | |
1480 | ||
1481 | return 0; | |
1482 | } | |
1483 | ||
21e70425 MAL |
1484 | static int vhost_user_reset_device(struct vhost_dev *dev) |
1485 | { | |
1486 | VhostUserMsg msg = { | |
24e34754 | 1487 | .hdr.flags = VHOST_USER_VERSION, |
22d2464f | 1488 | .hdr.request = VHOST_USER_RESET_DEVICE, |
21e70425 MAL |
1489 | }; |
1490 | ||
22d2464f SH |
1491 | /* |
1492 | * Historically, reset was not implemented so only reset devices | |
1493 | * that are expecting it. | |
1494 | */ | |
1495 | if (!virtio_has_feature(dev->protocol_features, | |
1496 | VHOST_USER_PROTOCOL_F_RESET_DEVICE)) { | |
1497 | return -ENOSYS; | |
1498 | } | |
d91d57e6 | 1499 | |
025faa87 | 1500 | return vhost_user_write(dev, &msg, NULL, 0); |
c2bea314 MAL |
1501 | } |
1502 | ||
f8ed3648 | 1503 | static int vhost_user_backend_handle_config_change(struct vhost_dev *dev) |
4c3e257b | 1504 | { |
025faa87 RK |
1505 | if (!dev->config_ops || !dev->config_ops->vhost_dev_config_notifier) { |
1506 | return -ENOSYS; | |
4c3e257b CL |
1507 | } |
1508 | ||
025faa87 | 1509 | return dev->config_ops->vhost_dev_config_notifier(dev); |
4c3e257b CL |
1510 | } |
1511 | ||
503e3554 AB |
1512 | /* |
1513 | * Fetch or create the notifier for a given idx. Newly created | |
1514 | * notifiers are added to the pointer array that tracks them. | |
1515 | */ | |
1516 | static VhostUserHostNotifier *fetch_or_create_notifier(VhostUserState *u, | |
1517 | int idx) | |
1518 | { | |
1519 | VhostUserHostNotifier *n = NULL; | |
1520 | if (idx >= u->notifiers->len) { | |
b595d627 | 1521 | g_ptr_array_set_size(u->notifiers, idx + 1); |
503e3554 AB |
1522 | } |
1523 | ||
1524 | n = g_ptr_array_index(u->notifiers, idx); | |
1525 | if (!n) { | |
bd437c96 YW |
1526 | /* |
1527 | * In case notification arrive out-of-order, | |
1528 | * make room for current index. | |
1529 | */ | |
1530 | g_ptr_array_remove_index(u->notifiers, idx); | |
503e3554 AB |
1531 | n = g_new0(VhostUserHostNotifier, 1); |
1532 | n->idx = idx; | |
1533 | g_ptr_array_insert(u->notifiers, idx, n); | |
1534 | trace_vhost_user_create_notifier(idx, n); | |
1535 | } | |
1536 | ||
1537 | return n; | |
1538 | } | |
1539 | ||
f8ed3648 | 1540 | static int vhost_user_backend_handle_vring_host_notifier(struct vhost_dev *dev, |
44866521 TB |
1541 | VhostUserVringArea *area, |
1542 | int fd) | |
1543 | { | |
1544 | int queue_idx = area->u64 & VHOST_USER_VRING_IDX_MASK; | |
8e3b0cbb | 1545 | size_t page_size = qemu_real_host_page_size(); |
44866521 TB |
1546 | struct vhost_user *u = dev->opaque; |
1547 | VhostUserState *user = u->user; | |
1548 | VirtIODevice *vdev = dev->vdev; | |
1549 | VhostUserHostNotifier *n; | |
1550 | void *addr; | |
1551 | char *name; | |
1552 | ||
1553 | if (!virtio_has_feature(dev->protocol_features, | |
1554 | VHOST_USER_PROTOCOL_F_HOST_NOTIFIER) || | |
1555 | vdev == NULL || queue_idx >= virtio_get_num_queues(vdev)) { | |
025faa87 | 1556 | return -EINVAL; |
44866521 TB |
1557 | } |
1558 | ||
503e3554 AB |
1559 | /* |
1560 | * Fetch notifier and invalidate any old data before setting up | |
1561 | * new mapped address. | |
1562 | */ | |
1563 | n = fetch_or_create_notifier(user, queue_idx); | |
1564 | vhost_user_host_notifier_remove(n, vdev); | |
44866521 TB |
1565 | |
1566 | if (area->u64 & VHOST_USER_VRING_NOFD_MASK) { | |
1567 | return 0; | |
1568 | } | |
1569 | ||
1570 | /* Sanity check. */ | |
1571 | if (area->size != page_size) { | |
025faa87 | 1572 | return -EINVAL; |
44866521 TB |
1573 | } |
1574 | ||
1575 | addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, | |
1576 | fd, area->offset); | |
1577 | if (addr == MAP_FAILED) { | |
025faa87 | 1578 | return -EFAULT; |
44866521 TB |
1579 | } |
1580 | ||
1581 | name = g_strdup_printf("vhost-user/host-notifier@%p mmaps[%d]", | |
1582 | user, queue_idx); | |
0b0af4d6 | 1583 | if (!n->mr.ram) { /* Don't init again after suspend. */ |
a1ed9ef1 XL |
1584 | memory_region_init_ram_device_ptr(&n->mr, OBJECT(vdev), name, |
1585 | page_size, addr); | |
0b0af4d6 XL |
1586 | } else { |
1587 | n->mr.ram_block->host = addr; | |
1588 | } | |
44866521 TB |
1589 | g_free(name); |
1590 | ||
1591 | if (virtio_queue_set_host_notifier_mr(vdev, queue_idx, &n->mr, true)) { | |
1f89d3b9 | 1592 | object_unparent(OBJECT(&n->mr)); |
44866521 | 1593 | munmap(addr, page_size); |
025faa87 | 1594 | return -ENXIO; |
44866521 TB |
1595 | } |
1596 | ||
1597 | n->addr = addr; | |
44866521 TB |
1598 | |
1599 | return 0; | |
1600 | } | |
1601 | ||
16094766 AE |
1602 | static int |
1603 | vhost_user_backend_handle_shared_object_add(struct vhost_dev *dev, | |
1604 | VhostUserShared *object) | |
1605 | { | |
1606 | QemuUUID uuid; | |
1607 | ||
1608 | memcpy(uuid.data, object->uuid, sizeof(object->uuid)); | |
1609 | return virtio_add_vhost_device(&uuid, dev); | |
1610 | } | |
1611 | ||
1612 | static int | |
043e127a AE |
1613 | vhost_user_backend_handle_shared_object_remove(struct vhost_dev *dev, |
1614 | VhostUserShared *object) | |
16094766 AE |
1615 | { |
1616 | QemuUUID uuid; | |
1617 | ||
1618 | memcpy(uuid.data, object->uuid, sizeof(object->uuid)); | |
043e127a AE |
1619 | switch (virtio_object_type(&uuid)) { |
1620 | case TYPE_VHOST_DEV: | |
1621 | { | |
1622 | struct vhost_dev *owner = virtio_lookup_vhost_device(&uuid); | |
1623 | if (dev != owner) { | |
1624 | /* Not allowed to remove non-owned entries */ | |
1625 | return 0; | |
1626 | } | |
1627 | break; | |
1628 | } | |
1629 | default: | |
1630 | /* Not allowed to remove non-owned entries */ | |
1631 | return 0; | |
1632 | } | |
1633 | ||
16094766 AE |
1634 | return virtio_remove_resource(&uuid); |
1635 | } | |
1636 | ||
1637 | static bool vhost_user_send_resp(QIOChannel *ioc, VhostUserHeader *hdr, | |
1638 | VhostUserPayload *payload, Error **errp) | |
1639 | { | |
1640 | struct iovec iov[] = { | |
1641 | { .iov_base = hdr, .iov_len = VHOST_USER_HDR_SIZE }, | |
1642 | { .iov_base = payload, .iov_len = hdr->size }, | |
1643 | }; | |
1644 | ||
1645 | hdr->flags &= ~VHOST_USER_NEED_REPLY_MASK; | |
1646 | hdr->flags |= VHOST_USER_REPLY_MASK; | |
1647 | ||
1648 | return !qio_channel_writev_all(ioc, iov, ARRAY_SIZE(iov), errp); | |
1649 | } | |
1650 | ||
1651 | static bool | |
1652 | vhost_user_backend_send_dmabuf_fd(QIOChannel *ioc, VhostUserHeader *hdr, | |
1653 | VhostUserPayload *payload, Error **errp) | |
1654 | { | |
1655 | hdr->size = sizeof(payload->u64); | |
1656 | return vhost_user_send_resp(ioc, hdr, payload, errp); | |
1657 | } | |
1658 | ||
1659 | int vhost_user_get_shared_object(struct vhost_dev *dev, unsigned char *uuid, | |
1660 | int *dmabuf_fd) | |
1661 | { | |
1662 | struct vhost_user *u = dev->opaque; | |
1663 | CharBackend *chr = u->user->chr; | |
1664 | int ret; | |
1665 | VhostUserMsg msg = { | |
1666 | .hdr.request = VHOST_USER_GET_SHARED_OBJECT, | |
1667 | .hdr.flags = VHOST_USER_VERSION, | |
1668 | }; | |
1669 | memcpy(msg.payload.object.uuid, uuid, sizeof(msg.payload.object.uuid)); | |
1670 | ||
1671 | ret = vhost_user_write(dev, &msg, NULL, 0); | |
1672 | if (ret < 0) { | |
1673 | return ret; | |
1674 | } | |
1675 | ||
1676 | ret = vhost_user_read(dev, &msg); | |
1677 | if (ret < 0) { | |
1678 | return ret; | |
1679 | } | |
1680 | ||
1681 | if (msg.hdr.request != VHOST_USER_GET_SHARED_OBJECT) { | |
1682 | error_report("Received unexpected msg type. " | |
1683 | "Expected %d received %d", | |
1684 | VHOST_USER_GET_SHARED_OBJECT, msg.hdr.request); | |
1685 | return -EPROTO; | |
1686 | } | |
1687 | ||
1688 | *dmabuf_fd = qemu_chr_fe_get_msgfd(chr); | |
1689 | if (*dmabuf_fd < 0) { | |
1690 | error_report("Failed to get dmabuf fd"); | |
1691 | return -EIO; | |
1692 | } | |
1693 | ||
1694 | return 0; | |
1695 | } | |
1696 | ||
1697 | static int | |
1698 | vhost_user_backend_handle_shared_object_lookup(struct vhost_user *u, | |
1699 | QIOChannel *ioc, | |
1700 | VhostUserHeader *hdr, | |
1701 | VhostUserPayload *payload) | |
1702 | { | |
1703 | QemuUUID uuid; | |
1704 | CharBackend *chr = u->user->chr; | |
1705 | Error *local_err = NULL; | |
1706 | int dmabuf_fd = -1; | |
1707 | int fd_num = 0; | |
1708 | ||
1709 | memcpy(uuid.data, payload->object.uuid, sizeof(payload->object.uuid)); | |
1710 | ||
1711 | payload->u64 = 0; | |
1712 | switch (virtio_object_type(&uuid)) { | |
1713 | case TYPE_DMABUF: | |
1714 | dmabuf_fd = virtio_lookup_dmabuf(&uuid); | |
1715 | break; | |
1716 | case TYPE_VHOST_DEV: | |
1717 | { | |
1718 | struct vhost_dev *dev = virtio_lookup_vhost_device(&uuid); | |
1719 | if (dev == NULL) { | |
1720 | payload->u64 = -EINVAL; | |
1721 | break; | |
1722 | } | |
1723 | int ret = vhost_user_get_shared_object(dev, uuid.data, &dmabuf_fd); | |
1724 | if (ret < 0) { | |
1725 | payload->u64 = ret; | |
1726 | } | |
1727 | break; | |
1728 | } | |
1729 | case TYPE_INVALID: | |
1730 | payload->u64 = -EINVAL; | |
1731 | break; | |
1732 | } | |
1733 | ||
1734 | if (dmabuf_fd != -1) { | |
1735 | fd_num++; | |
1736 | } | |
1737 | ||
1738 | if (qemu_chr_fe_set_msgfds(chr, &dmabuf_fd, fd_num) < 0) { | |
1739 | error_report("Failed to set msg fds."); | |
1740 | payload->u64 = -EINVAL; | |
1741 | } | |
1742 | ||
1743 | if (!vhost_user_backend_send_dmabuf_fd(ioc, hdr, payload, &local_err)) { | |
1744 | error_report_err(local_err); | |
1745 | return -EINVAL; | |
1746 | } | |
1747 | ||
1748 | return 0; | |
1749 | } | |
1750 | ||
f8ed3648 | 1751 | static void close_backend_channel(struct vhost_user *u) |
de62e494 | 1752 | { |
f8ed3648 MP |
1753 | g_source_destroy(u->backend_src); |
1754 | g_source_unref(u->backend_src); | |
1755 | u->backend_src = NULL; | |
1756 | object_unref(OBJECT(u->backend_ioc)); | |
1757 | u->backend_ioc = NULL; | |
de62e494 GK |
1758 | } |
1759 | ||
f8ed3648 | 1760 | static gboolean backend_read(QIOChannel *ioc, GIOCondition condition, |
57dc0217 | 1761 | gpointer opaque) |
4bbeeba0 MAL |
1762 | { |
1763 | struct vhost_dev *dev = opaque; | |
1764 | struct vhost_user *u = dev->opaque; | |
69aff030 MT |
1765 | VhostUserHeader hdr = { 0, }; |
1766 | VhostUserPayload payload = { 0, }; | |
57dc0217 GK |
1767 | Error *local_err = NULL; |
1768 | gboolean rc = G_SOURCE_CONTINUE; | |
1769 | int ret = 0; | |
1f3a4519 | 1770 | struct iovec iov; |
57dc0217 GK |
1771 | g_autofree int *fd = NULL; |
1772 | size_t fdsize = 0; | |
1773 | int i; | |
5f57fbea | 1774 | |
4bbeeba0 | 1775 | /* Read header */ |
1f3a4519 TB |
1776 | iov.iov_base = &hdr; |
1777 | iov.iov_len = VHOST_USER_HDR_SIZE; | |
1778 | ||
57dc0217 GK |
1779 | if (qio_channel_readv_full_all(ioc, &iov, 1, &fd, &fdsize, &local_err)) { |
1780 | error_report_err(local_err); | |
4bbeeba0 MAL |
1781 | goto err; |
1782 | } | |
1783 | ||
69aff030 | 1784 | if (hdr.size > VHOST_USER_PAYLOAD_SIZE) { |
4bbeeba0 | 1785 | error_report("Failed to read msg header." |
69aff030 | 1786 | " Size %d exceeds the maximum %zu.", hdr.size, |
4bbeeba0 MAL |
1787 | VHOST_USER_PAYLOAD_SIZE); |
1788 | goto err; | |
1789 | } | |
1790 | ||
1791 | /* Read payload */ | |
57dc0217 GK |
1792 | if (qio_channel_read_all(ioc, (char *) &payload, hdr.size, &local_err)) { |
1793 | error_report_err(local_err); | |
4bbeeba0 MAL |
1794 | goto err; |
1795 | } | |
1796 | ||
69aff030 | 1797 | switch (hdr.request) { |
a84ec993 | 1798 | case VHOST_USER_BACKEND_IOTLB_MSG: |
69aff030 | 1799 | ret = vhost_backend_handle_iotlb_msg(dev, &payload.iotlb); |
6dcdd06e | 1800 | break; |
a84ec993 | 1801 | case VHOST_USER_BACKEND_CONFIG_CHANGE_MSG: |
f8ed3648 | 1802 | ret = vhost_user_backend_handle_config_change(dev); |
4c3e257b | 1803 | break; |
a84ec993 | 1804 | case VHOST_USER_BACKEND_VRING_HOST_NOTIFIER_MSG: |
f8ed3648 | 1805 | ret = vhost_user_backend_handle_vring_host_notifier(dev, &payload.area, |
57dc0217 | 1806 | fd ? fd[0] : -1); |
44866521 | 1807 | break; |
16094766 AE |
1808 | case VHOST_USER_BACKEND_SHARED_OBJECT_ADD: |
1809 | ret = vhost_user_backend_handle_shared_object_add(dev, &payload.object); | |
1810 | break; | |
1811 | case VHOST_USER_BACKEND_SHARED_OBJECT_REMOVE: | |
043e127a AE |
1812 | ret = vhost_user_backend_handle_shared_object_remove(dev, |
1813 | &payload.object); | |
16094766 AE |
1814 | break; |
1815 | case VHOST_USER_BACKEND_SHARED_OBJECT_LOOKUP: | |
1816 | ret = vhost_user_backend_handle_shared_object_lookup(dev->opaque, ioc, | |
1817 | &hdr, &payload); | |
1818 | break; | |
4bbeeba0 | 1819 | default: |
0fdc465d | 1820 | error_report("Received unexpected msg type: %d.", hdr.request); |
4bbeeba0 MAL |
1821 | ret = -EINVAL; |
1822 | } | |
1823 | ||
1824 | /* | |
1825 | * REPLY_ACK feature handling. Other reply types has to be managed | |
1826 | * directly in their request handlers. | |
1827 | */ | |
69aff030 | 1828 | if (hdr.flags & VHOST_USER_NEED_REPLY_MASK) { |
69aff030 MT |
1829 | payload.u64 = !!ret; |
1830 | hdr.size = sizeof(payload.u64); | |
1831 | ||
16094766 | 1832 | if (!vhost_user_send_resp(ioc, &hdr, &payload, &local_err)) { |
57dc0217 | 1833 | error_report_err(local_err); |
4bbeeba0 MAL |
1834 | goto err; |
1835 | } | |
1836 | } | |
1837 | ||
9e06080b | 1838 | goto fdcleanup; |
4bbeeba0 MAL |
1839 | |
1840 | err: | |
f8ed3648 | 1841 | close_backend_channel(u); |
57dc0217 | 1842 | rc = G_SOURCE_REMOVE; |
9e06080b GK |
1843 | |
1844 | fdcleanup: | |
57dc0217 GK |
1845 | if (fd) { |
1846 | for (i = 0; i < fdsize; i++) { | |
5f57fbea TB |
1847 | close(fd[i]); |
1848 | } | |
1f3a4519 | 1849 | } |
57dc0217 | 1850 | return rc; |
4bbeeba0 MAL |
1851 | } |
1852 | ||
f8ed3648 | 1853 | static int vhost_setup_backend_channel(struct vhost_dev *dev) |
4bbeeba0 MAL |
1854 | { |
1855 | VhostUserMsg msg = { | |
a84ec993 | 1856 | .hdr.request = VHOST_USER_SET_BACKEND_REQ_FD, |
24e34754 | 1857 | .hdr.flags = VHOST_USER_VERSION, |
4bbeeba0 MAL |
1858 | }; |
1859 | struct vhost_user *u = dev->opaque; | |
1860 | int sv[2], ret = 0; | |
1861 | bool reply_supported = virtio_has_feature(dev->protocol_features, | |
1862 | VHOST_USER_PROTOCOL_F_REPLY_ACK); | |
57dc0217 GK |
1863 | Error *local_err = NULL; |
1864 | QIOChannel *ioc; | |
4bbeeba0 MAL |
1865 | |
1866 | if (!virtio_has_feature(dev->protocol_features, | |
a84ec993 | 1867 | VHOST_USER_PROTOCOL_F_BACKEND_REQ)) { |
4bbeeba0 MAL |
1868 | return 0; |
1869 | } | |
1870 | ||
9cbda7b3 | 1871 | if (qemu_socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) { |
025faa87 | 1872 | int saved_errno = errno; |
4bbeeba0 | 1873 | error_report("socketpair() failed"); |
025faa87 | 1874 | return -saved_errno; |
4bbeeba0 MAL |
1875 | } |
1876 | ||
57dc0217 GK |
1877 | ioc = QIO_CHANNEL(qio_channel_socket_new_fd(sv[0], &local_err)); |
1878 | if (!ioc) { | |
1879 | error_report_err(local_err); | |
025faa87 | 1880 | return -ECONNREFUSED; |
57dc0217 | 1881 | } |
f8ed3648 MP |
1882 | u->backend_ioc = ioc; |
1883 | u->backend_src = qio_channel_add_watch_source(u->backend_ioc, | |
f340a59d | 1884 | G_IO_IN | G_IO_HUP, |
f8ed3648 | 1885 | backend_read, dev, NULL, NULL); |
4bbeeba0 MAL |
1886 | |
1887 | if (reply_supported) { | |
24e34754 | 1888 | msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; |
4bbeeba0 MAL |
1889 | } |
1890 | ||
1891 | ret = vhost_user_write(dev, &msg, &sv[1], 1); | |
1892 | if (ret) { | |
1893 | goto out; | |
1894 | } | |
1895 | ||
1896 | if (reply_supported) { | |
1897 | ret = process_message_reply(dev, &msg); | |
1898 | } | |
1899 | ||
1900 | out: | |
1901 | close(sv[1]); | |
1902 | if (ret) { | |
f8ed3648 | 1903 | close_backend_channel(u); |
4bbeeba0 MAL |
1904 | } |
1905 | ||
1906 | return ret; | |
1907 | } | |
1908 | ||
18658a3c | 1909 | #ifdef CONFIG_LINUX |
f82c1116 DDAG |
1910 | /* |
1911 | * Called back from the postcopy fault thread when a fault is received on our | |
1912 | * ufd. | |
1913 | * TODO: This is Linux specific | |
1914 | */ | |
1915 | static int vhost_user_postcopy_fault_handler(struct PostCopyFD *pcfd, | |
1916 | void *ufd) | |
1917 | { | |
375318d0 DDAG |
1918 | struct vhost_dev *dev = pcfd->data; |
1919 | struct vhost_user *u = dev->opaque; | |
1920 | struct uffd_msg *msg = ufd; | |
1921 | uint64_t faultaddr = msg->arg.pagefault.address; | |
1922 | RAMBlock *rb = NULL; | |
1923 | uint64_t rb_offset; | |
1924 | int i; | |
1925 | ||
1926 | trace_vhost_user_postcopy_fault_handler(pcfd->idstr, faultaddr, | |
1927 | dev->mem->nregions); | |
1928 | for (i = 0; i < MIN(dev->mem->nregions, u->region_rb_len); i++) { | |
1929 | trace_vhost_user_postcopy_fault_handler_loop(i, | |
1930 | u->postcopy_client_bases[i], dev->mem->regions[i].memory_size); | |
1931 | if (faultaddr >= u->postcopy_client_bases[i]) { | |
1932 | /* Ofset of the fault address in the vhost region */ | |
1933 | uint64_t region_offset = faultaddr - u->postcopy_client_bases[i]; | |
1934 | if (region_offset < dev->mem->regions[i].memory_size) { | |
1935 | rb_offset = region_offset + u->region_rb_offset[i]; | |
1936 | trace_vhost_user_postcopy_fault_handler_found(i, | |
1937 | region_offset, rb_offset); | |
1938 | rb = u->region_rb[i]; | |
1939 | return postcopy_request_shared_page(pcfd, rb, faultaddr, | |
1940 | rb_offset); | |
1941 | } | |
1942 | } | |
1943 | } | |
1944 | error_report("%s: Failed to find region for fault %" PRIx64, | |
1945 | __func__, faultaddr); | |
1946 | return -1; | |
f82c1116 DDAG |
1947 | } |
1948 | ||
c07e3615 DDAG |
1949 | static int vhost_user_postcopy_waker(struct PostCopyFD *pcfd, RAMBlock *rb, |
1950 | uint64_t offset) | |
1951 | { | |
1952 | struct vhost_dev *dev = pcfd->data; | |
1953 | struct vhost_user *u = dev->opaque; | |
1954 | int i; | |
1955 | ||
1956 | trace_vhost_user_postcopy_waker(qemu_ram_get_idstr(rb), offset); | |
1957 | ||
1958 | if (!u) { | |
1959 | return 0; | |
1960 | } | |
1961 | /* Translate the offset into an address in the clients address space */ | |
1962 | for (i = 0; i < MIN(dev->mem->nregions, u->region_rb_len); i++) { | |
1963 | if (u->region_rb[i] == rb && | |
1964 | offset >= u->region_rb_offset[i] && | |
1965 | offset < (u->region_rb_offset[i] + | |
1966 | dev->mem->regions[i].memory_size)) { | |
1967 | uint64_t client_addr = (offset - u->region_rb_offset[i]) + | |
1968 | u->postcopy_client_bases[i]; | |
1969 | trace_vhost_user_postcopy_waker_found(client_addr); | |
1970 | return postcopy_wake_shared(pcfd, client_addr, rb); | |
1971 | } | |
1972 | } | |
1973 | ||
1974 | trace_vhost_user_postcopy_waker_nomatch(qemu_ram_get_idstr(rb), offset); | |
1975 | return 0; | |
1976 | } | |
18658a3c | 1977 | #endif |
c07e3615 | 1978 | |
d3dff7a5 DDAG |
1979 | /* |
1980 | * Called at the start of an inbound postcopy on reception of the | |
1981 | * 'advise' command. | |
1982 | */ | |
1983 | static int vhost_user_postcopy_advise(struct vhost_dev *dev, Error **errp) | |
1984 | { | |
18658a3c | 1985 | #ifdef CONFIG_LINUX |
d3dff7a5 | 1986 | struct vhost_user *u = dev->opaque; |
4d0cf552 | 1987 | CharBackend *chr = u->user->chr; |
d3dff7a5 | 1988 | int ufd; |
025faa87 | 1989 | int ret; |
d3dff7a5 DDAG |
1990 | VhostUserMsg msg = { |
1991 | .hdr.request = VHOST_USER_POSTCOPY_ADVISE, | |
1992 | .hdr.flags = VHOST_USER_VERSION, | |
1993 | }; | |
1994 | ||
025faa87 RK |
1995 | ret = vhost_user_write(dev, &msg, NULL, 0); |
1996 | if (ret < 0) { | |
d3dff7a5 | 1997 | error_setg(errp, "Failed to send postcopy_advise to vhost"); |
025faa87 | 1998 | return ret; |
d3dff7a5 DDAG |
1999 | } |
2000 | ||
025faa87 RK |
2001 | ret = vhost_user_read(dev, &msg); |
2002 | if (ret < 0) { | |
d3dff7a5 | 2003 | error_setg(errp, "Failed to get postcopy_advise reply from vhost"); |
025faa87 | 2004 | return ret; |
d3dff7a5 DDAG |
2005 | } |
2006 | ||
2007 | if (msg.hdr.request != VHOST_USER_POSTCOPY_ADVISE) { | |
2008 | error_setg(errp, "Unexpected msg type. Expected %d received %d", | |
2009 | VHOST_USER_POSTCOPY_ADVISE, msg.hdr.request); | |
025faa87 | 2010 | return -EPROTO; |
d3dff7a5 DDAG |
2011 | } |
2012 | ||
2013 | if (msg.hdr.size) { | |
2014 | error_setg(errp, "Received bad msg size."); | |
025faa87 | 2015 | return -EPROTO; |
d3dff7a5 DDAG |
2016 | } |
2017 | ufd = qemu_chr_fe_get_msgfd(chr); | |
2018 | if (ufd < 0) { | |
2019 | error_setg(errp, "%s: Failed to get ufd", __func__); | |
025faa87 | 2020 | return -EIO; |
d3dff7a5 | 2021 | } |
ff5927ba | 2022 | qemu_socket_set_nonblock(ufd); |
d3dff7a5 | 2023 | |
f82c1116 DDAG |
2024 | /* register ufd with userfault thread */ |
2025 | u->postcopy_fd.fd = ufd; | |
2026 | u->postcopy_fd.data = dev; | |
2027 | u->postcopy_fd.handler = vhost_user_postcopy_fault_handler; | |
c07e3615 | 2028 | u->postcopy_fd.waker = vhost_user_postcopy_waker; |
f82c1116 DDAG |
2029 | u->postcopy_fd.idstr = "vhost-user"; /* Need to find unique name */ |
2030 | postcopy_register_shared_ufd(&u->postcopy_fd); | |
d3dff7a5 | 2031 | return 0; |
18658a3c PB |
2032 | #else |
2033 | error_setg(errp, "Postcopy not supported on non-Linux systems"); | |
025faa87 | 2034 | return -ENOSYS; |
18658a3c | 2035 | #endif |
d3dff7a5 DDAG |
2036 | } |
2037 | ||
6864a7b5 DDAG |
2038 | /* |
2039 | * Called at the switch to postcopy on reception of the 'listen' command. | |
2040 | */ | |
2041 | static int vhost_user_postcopy_listen(struct vhost_dev *dev, Error **errp) | |
2042 | { | |
2043 | struct vhost_user *u = dev->opaque; | |
2044 | int ret; | |
2045 | VhostUserMsg msg = { | |
2046 | .hdr.request = VHOST_USER_POSTCOPY_LISTEN, | |
2047 | .hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK, | |
2048 | }; | |
2049 | u->postcopy_listen = true; | |
025faa87 | 2050 | |
6864a7b5 | 2051 | trace_vhost_user_postcopy_listen(); |
025faa87 RK |
2052 | |
2053 | ret = vhost_user_write(dev, &msg, NULL, 0); | |
2054 | if (ret < 0) { | |
6864a7b5 | 2055 | error_setg(errp, "Failed to send postcopy_listen to vhost"); |
025faa87 | 2056 | return ret; |
6864a7b5 DDAG |
2057 | } |
2058 | ||
2059 | ret = process_message_reply(dev, &msg); | |
2060 | if (ret) { | |
2061 | error_setg(errp, "Failed to receive reply to postcopy_listen"); | |
2062 | return ret; | |
2063 | } | |
2064 | ||
2065 | return 0; | |
2066 | } | |
2067 | ||
46343570 DDAG |
2068 | /* |
2069 | * Called at the end of postcopy | |
2070 | */ | |
2071 | static int vhost_user_postcopy_end(struct vhost_dev *dev, Error **errp) | |
2072 | { | |
2073 | VhostUserMsg msg = { | |
2074 | .hdr.request = VHOST_USER_POSTCOPY_END, | |
2075 | .hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK, | |
2076 | }; | |
2077 | int ret; | |
2078 | struct vhost_user *u = dev->opaque; | |
2079 | ||
2080 | trace_vhost_user_postcopy_end_entry(); | |
025faa87 RK |
2081 | |
2082 | ret = vhost_user_write(dev, &msg, NULL, 0); | |
2083 | if (ret < 0) { | |
46343570 | 2084 | error_setg(errp, "Failed to send postcopy_end to vhost"); |
025faa87 | 2085 | return ret; |
46343570 DDAG |
2086 | } |
2087 | ||
2088 | ret = process_message_reply(dev, &msg); | |
2089 | if (ret) { | |
2090 | error_setg(errp, "Failed to receive reply to postcopy_end"); | |
2091 | return ret; | |
2092 | } | |
2093 | postcopy_unregister_shared_ufd(&u->postcopy_fd); | |
c4f75385 | 2094 | close(u->postcopy_fd.fd); |
46343570 DDAG |
2095 | u->postcopy_fd.handler = NULL; |
2096 | ||
2097 | trace_vhost_user_postcopy_end_exit(); | |
2098 | ||
2099 | return 0; | |
2100 | } | |
2101 | ||
9ccbfe14 | 2102 | static int vhost_user_postcopy_notifier(NotifierWithReturn *notifier, |
be19d836 | 2103 | void *opaque, Error **errp) |
9ccbfe14 DDAG |
2104 | { |
2105 | struct PostcopyNotifyData *pnd = opaque; | |
2106 | struct vhost_user *u = container_of(notifier, struct vhost_user, | |
2107 | postcopy_notifier); | |
2108 | struct vhost_dev *dev = u->dev; | |
2109 | ||
2110 | switch (pnd->reason) { | |
2111 | case POSTCOPY_NOTIFY_PROBE: | |
2112 | if (!virtio_has_feature(dev->protocol_features, | |
2113 | VHOST_USER_PROTOCOL_F_PAGEFAULT)) { | |
2114 | /* TODO: Get the device name into this error somehow */ | |
d91f33c7 | 2115 | error_setg(errp, |
9ccbfe14 DDAG |
2116 | "vhost-user backend not capable of postcopy"); |
2117 | return -ENOENT; | |
2118 | } | |
2119 | break; | |
2120 | ||
d3dff7a5 | 2121 | case POSTCOPY_NOTIFY_INBOUND_ADVISE: |
d91f33c7 | 2122 | return vhost_user_postcopy_advise(dev, errp); |
d3dff7a5 | 2123 | |
6864a7b5 | 2124 | case POSTCOPY_NOTIFY_INBOUND_LISTEN: |
d91f33c7 | 2125 | return vhost_user_postcopy_listen(dev, errp); |
6864a7b5 | 2126 | |
46343570 | 2127 | case POSTCOPY_NOTIFY_INBOUND_END: |
d91f33c7 | 2128 | return vhost_user_postcopy_end(dev, errp); |
46343570 | 2129 | |
9ccbfe14 DDAG |
2130 | default: |
2131 | /* We ignore notifications we don't know */ | |
2132 | break; | |
2133 | } | |
2134 | ||
2135 | return 0; | |
2136 | } | |
2137 | ||
28770ff9 KW |
2138 | static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque, |
2139 | Error **errp) | |
5f6f6664 | 2140 | { |
56534930 | 2141 | uint64_t features, ram_slots; |
2152f3fe | 2142 | struct vhost_user *u; |
56534930 | 2143 | VhostUserState *vus = (VhostUserState *) opaque; |
dcb10c00 MT |
2144 | int err; |
2145 | ||
5f6f6664 NN |
2146 | assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); |
2147 | ||
2152f3fe | 2148 | u = g_new0(struct vhost_user, 1); |
56534930 | 2149 | u->user = vus; |
9ccbfe14 | 2150 | u->dev = dev; |
2152f3fe | 2151 | dev->opaque = u; |
5f6f6664 | 2152 | |
21e70425 | 2153 | err = vhost_user_get_features(dev, &features); |
dcb10c00 | 2154 | if (err < 0) { |
998647dc | 2155 | error_setg_errno(errp, -err, "vhost_backend_init failed"); |
f2a6e6c4 | 2156 | return err; |
dcb10c00 MT |
2157 | } |
2158 | ||
2159 | if (virtio_has_feature(features, VHOST_USER_F_PROTOCOL_FEATURES)) { | |
56534930 AB |
2160 | bool supports_f_config = vus->supports_config || |
2161 | (dev->config_ops && dev->config_ops->vhost_dev_config_notifier); | |
2162 | uint64_t protocol_features; | |
2163 | ||
dcb10c00 MT |
2164 | dev->backend_features |= 1ULL << VHOST_USER_F_PROTOCOL_FEATURES; |
2165 | ||
21e70425 | 2166 | err = vhost_user_get_u64(dev, VHOST_USER_GET_PROTOCOL_FEATURES, |
6dcdd06e | 2167 | &protocol_features); |
dcb10c00 | 2168 | if (err < 0) { |
998647dc | 2169 | error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); |
28770ff9 | 2170 | return -EPROTO; |
dcb10c00 MT |
2171 | } |
2172 | ||
56534930 AB |
2173 | /* |
2174 | * We will use all the protocol features we support - although | |
2175 | * we suppress F_CONFIG if we know QEMUs internal code can not support | |
2176 | * it. | |
2177 | */ | |
2178 | protocol_features &= VHOST_USER_PROTOCOL_FEATURE_MASK; | |
2179 | ||
2180 | if (supports_f_config) { | |
2181 | if (!virtio_has_feature(protocol_features, | |
2182 | VHOST_USER_PROTOCOL_F_CONFIG)) { | |
fb38d0c9 | 2183 | error_setg(errp, "vhost-user device expecting " |
56534930 | 2184 | "VHOST_USER_PROTOCOL_F_CONFIG but the vhost-user backend does " |
fb38d0c9 | 2185 | "not support it."); |
56534930 AB |
2186 | return -EPROTO; |
2187 | } | |
2188 | } else { | |
2189 | if (virtio_has_feature(protocol_features, | |
2190 | VHOST_USER_PROTOCOL_F_CONFIG)) { | |
90e31232 AE |
2191 | warn_report("vhost-user backend supports " |
2192 | "VHOST_USER_PROTOCOL_F_CONFIG but QEMU does not."); | |
56534930 AB |
2193 | protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_CONFIG); |
2194 | } | |
1c3e5a26 MC |
2195 | } |
2196 | ||
56534930 AB |
2197 | /* final set of protocol features */ |
2198 | dev->protocol_features = protocol_features; | |
21e70425 | 2199 | err = vhost_user_set_protocol_features(dev, dev->protocol_features); |
dcb10c00 | 2200 | if (err < 0) { |
998647dc | 2201 | error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); |
28770ff9 | 2202 | return -EPROTO; |
dcb10c00 | 2203 | } |
e2051e9e YL |
2204 | |
2205 | /* query the max queues we support if backend supports Multiple Queue */ | |
2206 | if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MQ)) { | |
21e70425 MAL |
2207 | err = vhost_user_get_u64(dev, VHOST_USER_GET_QUEUE_NUM, |
2208 | &dev->max_queues); | |
e2051e9e | 2209 | if (err < 0) { |
998647dc | 2210 | error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); |
28770ff9 | 2211 | return -EPROTO; |
e2051e9e | 2212 | } |
84affad1 KW |
2213 | } else { |
2214 | dev->max_queues = 1; | |
e2051e9e | 2215 | } |
84affad1 | 2216 | |
c90bd505 | 2217 | if (dev->num_queues && dev->max_queues < dev->num_queues) { |
28770ff9 KW |
2218 | error_setg(errp, "The maximum number of queues supported by the " |
2219 | "backend is %" PRIu64, dev->max_queues); | |
c90bd505 KW |
2220 | return -EINVAL; |
2221 | } | |
6dcdd06e MC |
2222 | |
2223 | if (virtio_has_feature(features, VIRTIO_F_IOMMU_PLATFORM) && | |
2224 | !(virtio_has_feature(dev->protocol_features, | |
a84ec993 | 2225 | VHOST_USER_PROTOCOL_F_BACKEND_REQ) && |
6dcdd06e MC |
2226 | virtio_has_feature(dev->protocol_features, |
2227 | VHOST_USER_PROTOCOL_F_REPLY_ACK))) { | |
28770ff9 | 2228 | error_setg(errp, "IOMMU support requires reply-ack and " |
f8ed3648 | 2229 | "backend-req protocol features."); |
28770ff9 | 2230 | return -EINVAL; |
6dcdd06e | 2231 | } |
6b0eff1a RN |
2232 | |
2233 | /* get max memory regions if backend supports configurable RAM slots */ | |
2234 | if (!virtio_has_feature(dev->protocol_features, | |
2235 | VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS)) { | |
27598393 | 2236 | u->user->memory_slots = VHOST_MEMORY_BASELINE_NREGIONS; |
6b0eff1a RN |
2237 | } else { |
2238 | err = vhost_user_get_max_memslots(dev, &ram_slots); | |
2239 | if (err < 0) { | |
998647dc | 2240 | error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); |
28770ff9 | 2241 | return -EPROTO; |
6b0eff1a RN |
2242 | } |
2243 | ||
2244 | if (ram_slots < u->user->memory_slots) { | |
28770ff9 KW |
2245 | error_setg(errp, "The backend specified a max ram slots limit " |
2246 | "of %" PRIu64", when the prior validated limit was " | |
2247 | "%d. This limit should never decrease.", ram_slots, | |
2248 | u->user->memory_slots); | |
2249 | return -EINVAL; | |
6b0eff1a RN |
2250 | } |
2251 | ||
27598393 | 2252 | u->user->memory_slots = MIN(ram_slots, VHOST_USER_MAX_RAM_SLOTS); |
6b0eff1a | 2253 | } |
dcb10c00 MT |
2254 | } |
2255 | ||
d2fc4402 MAL |
2256 | if (dev->migration_blocker == NULL && |
2257 | !virtio_has_feature(dev->protocol_features, | |
2258 | VHOST_USER_PROTOCOL_F_LOG_SHMFD)) { | |
2259 | error_setg(&dev->migration_blocker, | |
2260 | "Migration disabled: vhost-user backend lacks " | |
2261 | "VHOST_USER_PROTOCOL_F_LOG_SHMFD feature."); | |
2262 | } | |
2263 | ||
67b3965e | 2264 | if (dev->vq_index == 0) { |
f8ed3648 | 2265 | err = vhost_setup_backend_channel(dev); |
67b3965e | 2266 | if (err < 0) { |
998647dc | 2267 | error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); |
28770ff9 | 2268 | return -EPROTO; |
67b3965e | 2269 | } |
4bbeeba0 MAL |
2270 | } |
2271 | ||
9ccbfe14 DDAG |
2272 | u->postcopy_notifier.notify = vhost_user_postcopy_notifier; |
2273 | postcopy_add_notifier(&u->postcopy_notifier); | |
2274 | ||
5f6f6664 NN |
2275 | return 0; |
2276 | } | |
2277 | ||
4d0cf552 | 2278 | static int vhost_user_backend_cleanup(struct vhost_dev *dev) |
5f6f6664 | 2279 | { |
2152f3fe MAL |
2280 | struct vhost_user *u; |
2281 | ||
5f6f6664 NN |
2282 | assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); |
2283 | ||
2152f3fe | 2284 | u = dev->opaque; |
9ccbfe14 DDAG |
2285 | if (u->postcopy_notifier.notify) { |
2286 | postcopy_remove_notifier(&u->postcopy_notifier); | |
2287 | u->postcopy_notifier.notify = NULL; | |
2288 | } | |
c4f75385 IM |
2289 | u->postcopy_listen = false; |
2290 | if (u->postcopy_fd.handler) { | |
2291 | postcopy_unregister_shared_ufd(&u->postcopy_fd); | |
2292 | close(u->postcopy_fd.fd); | |
2293 | u->postcopy_fd.handler = NULL; | |
2294 | } | |
f8ed3648 MP |
2295 | if (u->backend_ioc) { |
2296 | close_backend_channel(u); | |
4bbeeba0 | 2297 | } |
905125d0 DDAG |
2298 | g_free(u->region_rb); |
2299 | u->region_rb = NULL; | |
2300 | g_free(u->region_rb_offset); | |
2301 | u->region_rb_offset = NULL; | |
2302 | u->region_rb_len = 0; | |
2152f3fe | 2303 | g_free(u); |
5f6f6664 NN |
2304 | dev->opaque = 0; |
2305 | ||
2306 | return 0; | |
2307 | } | |
2308 | ||
fc57fd99 YL |
2309 | static int vhost_user_get_vq_index(struct vhost_dev *dev, int idx) |
2310 | { | |
2311 | assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); | |
2312 | ||
2313 | return idx; | |
2314 | } | |
2315 | ||
2ce68e4c IM |
2316 | static int vhost_user_memslots_limit(struct vhost_dev *dev) |
2317 | { | |
6b0eff1a RN |
2318 | struct vhost_user *u = dev->opaque; |
2319 | ||
2320 | return u->user->memory_slots; | |
2ce68e4c IM |
2321 | } |
2322 | ||
1be0ac21 MAL |
2323 | static bool vhost_user_requires_shm_log(struct vhost_dev *dev) |
2324 | { | |
2325 | assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); | |
2326 | ||
2327 | return virtio_has_feature(dev->protocol_features, | |
2328 | VHOST_USER_PROTOCOL_F_LOG_SHMFD); | |
2329 | } | |
2330 | ||
3e866365 TC |
2331 | static int vhost_user_migration_done(struct vhost_dev *dev, char* mac_addr) |
2332 | { | |
ebf2a499 | 2333 | VhostUserMsg msg = { }; |
3e866365 TC |
2334 | |
2335 | assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); | |
2336 | ||
2337 | /* If guest supports GUEST_ANNOUNCE do nothing */ | |
2338 | if (virtio_has_feature(dev->acked_features, VIRTIO_NET_F_GUEST_ANNOUNCE)) { | |
2339 | return 0; | |
2340 | } | |
2341 | ||
2342 | /* if backend supports VHOST_USER_PROTOCOL_F_RARP ask it to send the RARP */ | |
2343 | if (virtio_has_feature(dev->protocol_features, | |
2344 | VHOST_USER_PROTOCOL_F_RARP)) { | |
24e34754 MT |
2345 | msg.hdr.request = VHOST_USER_SEND_RARP; |
2346 | msg.hdr.flags = VHOST_USER_VERSION; | |
7f4a930e | 2347 | memcpy((char *)&msg.payload.u64, mac_addr, 6); |
24e34754 | 2348 | msg.hdr.size = sizeof(msg.payload.u64); |
3e866365 | 2349 | |
c4843a45 | 2350 | return vhost_user_write(dev, &msg, NULL, 0); |
3e866365 | 2351 | } |
025faa87 | 2352 | return -ENOTSUP; |
3e866365 TC |
2353 | } |
2354 | ||
c5f048d8 MC |
2355 | static int vhost_user_net_set_mtu(struct vhost_dev *dev, uint16_t mtu) |
2356 | { | |
2357 | VhostUserMsg msg; | |
2358 | bool reply_supported = virtio_has_feature(dev->protocol_features, | |
2359 | VHOST_USER_PROTOCOL_F_REPLY_ACK); | |
025faa87 | 2360 | int ret; |
c5f048d8 MC |
2361 | |
2362 | if (!(dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_NET_MTU))) { | |
2363 | return 0; | |
2364 | } | |
2365 | ||
24e34754 | 2366 | msg.hdr.request = VHOST_USER_NET_SET_MTU; |
c5f048d8 | 2367 | msg.payload.u64 = mtu; |
24e34754 MT |
2368 | msg.hdr.size = sizeof(msg.payload.u64); |
2369 | msg.hdr.flags = VHOST_USER_VERSION; | |
c5f048d8 | 2370 | if (reply_supported) { |
24e34754 | 2371 | msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; |
c5f048d8 MC |
2372 | } |
2373 | ||
025faa87 RK |
2374 | ret = vhost_user_write(dev, &msg, NULL, 0); |
2375 | if (ret < 0) { | |
2376 | return ret; | |
c5f048d8 MC |
2377 | } |
2378 | ||
f8ed3648 | 2379 | /* If reply_ack supported, backend has to ack specified MTU is valid */ |
c5f048d8 | 2380 | if (reply_supported) { |
3cf7daf8 | 2381 | return process_message_reply(dev, &msg); |
c5f048d8 MC |
2382 | } |
2383 | ||
2384 | return 0; | |
2385 | } | |
2386 | ||
6dcdd06e MC |
2387 | static int vhost_user_send_device_iotlb_msg(struct vhost_dev *dev, |
2388 | struct vhost_iotlb_msg *imsg) | |
2389 | { | |
025faa87 | 2390 | int ret; |
6dcdd06e | 2391 | VhostUserMsg msg = { |
24e34754 MT |
2392 | .hdr.request = VHOST_USER_IOTLB_MSG, |
2393 | .hdr.size = sizeof(msg.payload.iotlb), | |
2394 | .hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK, | |
6dcdd06e MC |
2395 | .payload.iotlb = *imsg, |
2396 | }; | |
2397 | ||
025faa87 RK |
2398 | ret = vhost_user_write(dev, &msg, NULL, 0); |
2399 | if (ret < 0) { | |
2400 | return ret; | |
6dcdd06e MC |
2401 | } |
2402 | ||
2403 | return process_message_reply(dev, &msg); | |
2404 | } | |
2405 | ||
2406 | ||
2407 | static void vhost_user_set_iotlb_callback(struct vhost_dev *dev, int enabled) | |
2408 | { | |
2409 | /* No-op as the receive channel is not dedicated to IOTLB messages. */ | |
2410 | } | |
2411 | ||
4c3e257b | 2412 | static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config, |
50de5138 | 2413 | uint32_t config_len, Error **errp) |
4c3e257b | 2414 | { |
025faa87 | 2415 | int ret; |
4c3e257b | 2416 | VhostUserMsg msg = { |
24e34754 MT |
2417 | .hdr.request = VHOST_USER_GET_CONFIG, |
2418 | .hdr.flags = VHOST_USER_VERSION, | |
2419 | .hdr.size = VHOST_USER_CONFIG_HDR_SIZE + config_len, | |
4c3e257b CL |
2420 | }; |
2421 | ||
1c3e5a26 MC |
2422 | if (!virtio_has_feature(dev->protocol_features, |
2423 | VHOST_USER_PROTOCOL_F_CONFIG)) { | |
50de5138 KW |
2424 | error_setg(errp, "VHOST_USER_PROTOCOL_F_CONFIG not supported"); |
2425 | return -EINVAL; | |
1c3e5a26 MC |
2426 | } |
2427 | ||
50de5138 | 2428 | assert(config_len <= VHOST_USER_MAX_CONFIG_SIZE); |
4c3e257b CL |
2429 | |
2430 | msg.payload.config.offset = 0; | |
2431 | msg.payload.config.size = config_len; | |
025faa87 RK |
2432 | ret = vhost_user_write(dev, &msg, NULL, 0); |
2433 | if (ret < 0) { | |
2434 | error_setg_errno(errp, -ret, "vhost_get_config failed"); | |
2435 | return ret; | |
4c3e257b CL |
2436 | } |
2437 | ||
025faa87 RK |
2438 | ret = vhost_user_read(dev, &msg); |
2439 | if (ret < 0) { | |
2440 | error_setg_errno(errp, -ret, "vhost_get_config failed"); | |
2441 | return ret; | |
4c3e257b CL |
2442 | } |
2443 | ||
24e34754 | 2444 | if (msg.hdr.request != VHOST_USER_GET_CONFIG) { |
50de5138 KW |
2445 | error_setg(errp, |
2446 | "Received unexpected msg type. Expected %d received %d", | |
2447 | VHOST_USER_GET_CONFIG, msg.hdr.request); | |
025faa87 | 2448 | return -EPROTO; |
4c3e257b CL |
2449 | } |
2450 | ||
24e34754 | 2451 | if (msg.hdr.size != VHOST_USER_CONFIG_HDR_SIZE + config_len) { |
50de5138 | 2452 | error_setg(errp, "Received bad msg size."); |
025faa87 | 2453 | return -EPROTO; |
4c3e257b CL |
2454 | } |
2455 | ||
2456 | memcpy(config, msg.payload.config.region, config_len); | |
2457 | ||
2458 | return 0; | |
2459 | } | |
2460 | ||
2461 | static int vhost_user_set_config(struct vhost_dev *dev, const uint8_t *data, | |
2462 | uint32_t offset, uint32_t size, uint32_t flags) | |
2463 | { | |
025faa87 | 2464 | int ret; |
4c3e257b CL |
2465 | uint8_t *p; |
2466 | bool reply_supported = virtio_has_feature(dev->protocol_features, | |
2467 | VHOST_USER_PROTOCOL_F_REPLY_ACK); | |
2468 | ||
2469 | VhostUserMsg msg = { | |
24e34754 MT |
2470 | .hdr.request = VHOST_USER_SET_CONFIG, |
2471 | .hdr.flags = VHOST_USER_VERSION, | |
2472 | .hdr.size = VHOST_USER_CONFIG_HDR_SIZE + size, | |
4c3e257b CL |
2473 | }; |
2474 | ||
1c3e5a26 MC |
2475 | if (!virtio_has_feature(dev->protocol_features, |
2476 | VHOST_USER_PROTOCOL_F_CONFIG)) { | |
025faa87 | 2477 | return -ENOTSUP; |
1c3e5a26 MC |
2478 | } |
2479 | ||
4c3e257b | 2480 | if (reply_supported) { |
24e34754 | 2481 | msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; |
4c3e257b CL |
2482 | } |
2483 | ||
2484 | if (size > VHOST_USER_MAX_CONFIG_SIZE) { | |
025faa87 | 2485 | return -EINVAL; |
4c3e257b CL |
2486 | } |
2487 | ||
2488 | msg.payload.config.offset = offset, | |
2489 | msg.payload.config.size = size, | |
2490 | msg.payload.config.flags = flags, | |
2491 | p = msg.payload.config.region; | |
2492 | memcpy(p, data, size); | |
2493 | ||
025faa87 RK |
2494 | ret = vhost_user_write(dev, &msg, NULL, 0); |
2495 | if (ret < 0) { | |
2496 | return ret; | |
4c3e257b CL |
2497 | } |
2498 | ||
2499 | if (reply_supported) { | |
2500 | return process_message_reply(dev, &msg); | |
2501 | } | |
2502 | ||
2503 | return 0; | |
2504 | } | |
2505 | ||
efbfeb81 GA |
2506 | static int vhost_user_crypto_create_session(struct vhost_dev *dev, |
2507 | void *session_info, | |
2508 | uint64_t *session_id) | |
2509 | { | |
025faa87 | 2510 | int ret; |
efbfeb81 GA |
2511 | bool crypto_session = virtio_has_feature(dev->protocol_features, |
2512 | VHOST_USER_PROTOCOL_F_CRYPTO_SESSION); | |
5c33f978 | 2513 | CryptoDevBackendSessionInfo *backend_info = session_info; |
efbfeb81 GA |
2514 | VhostUserMsg msg = { |
2515 | .hdr.request = VHOST_USER_CREATE_CRYPTO_SESSION, | |
2516 | .hdr.flags = VHOST_USER_VERSION, | |
2517 | .hdr.size = sizeof(msg.payload.session), | |
2518 | }; | |
2519 | ||
2520 | assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); | |
2521 | ||
2522 | if (!crypto_session) { | |
2523 | error_report("vhost-user trying to send unhandled ioctl"); | |
025faa87 | 2524 | return -ENOTSUP; |
efbfeb81 GA |
2525 | } |
2526 | ||
5c33f978 GM |
2527 | if (backend_info->op_code == VIRTIO_CRYPTO_AKCIPHER_CREATE_SESSION) { |
2528 | CryptoDevBackendAsymSessionInfo *sess = &backend_info->u.asym_sess_info; | |
2529 | size_t keylen; | |
2530 | ||
2531 | memcpy(&msg.payload.session.u.asym.session_setup_data, sess, | |
2532 | sizeof(CryptoDevBackendAsymSessionInfo)); | |
2533 | if (sess->keylen) { | |
2534 | keylen = sizeof(msg.payload.session.u.asym.key); | |
2535 | if (sess->keylen > keylen) { | |
2536 | error_report("Unsupported asymmetric key size"); | |
2537 | return -ENOTSUP; | |
2538 | } | |
2539 | ||
2540 | memcpy(&msg.payload.session.u.asym.key, sess->key, | |
2541 | sess->keylen); | |
2542 | } | |
2543 | } else { | |
2544 | CryptoDevBackendSymSessionInfo *sess = &backend_info->u.sym_sess_info; | |
2545 | size_t keylen; | |
2546 | ||
2547 | memcpy(&msg.payload.session.u.sym.session_setup_data, sess, | |
2548 | sizeof(CryptoDevBackendSymSessionInfo)); | |
2549 | if (sess->key_len) { | |
2550 | keylen = sizeof(msg.payload.session.u.sym.key); | |
2551 | if (sess->key_len > keylen) { | |
2552 | error_report("Unsupported cipher key size"); | |
2553 | return -ENOTSUP; | |
2554 | } | |
2555 | ||
2556 | memcpy(&msg.payload.session.u.sym.key, sess->cipher_key, | |
2557 | sess->key_len); | |
2558 | } | |
2559 | ||
2560 | if (sess->auth_key_len > 0) { | |
2561 | keylen = sizeof(msg.payload.session.u.sym.auth_key); | |
2562 | if (sess->auth_key_len > keylen) { | |
2563 | error_report("Unsupported auth key size"); | |
2564 | return -ENOTSUP; | |
2565 | } | |
2566 | ||
2567 | memcpy(&msg.payload.session.u.sym.auth_key, sess->auth_key, | |
2568 | sess->auth_key_len); | |
2569 | } | |
efbfeb81 | 2570 | } |
5c33f978 GM |
2571 | |
2572 | msg.payload.session.op_code = backend_info->op_code; | |
2573 | msg.payload.session.session_id = backend_info->session_id; | |
025faa87 RK |
2574 | ret = vhost_user_write(dev, &msg, NULL, 0); |
2575 | if (ret < 0) { | |
2576 | error_report("vhost_user_write() return %d, create session failed", | |
2577 | ret); | |
2578 | return ret; | |
efbfeb81 GA |
2579 | } |
2580 | ||
025faa87 RK |
2581 | ret = vhost_user_read(dev, &msg); |
2582 | if (ret < 0) { | |
2583 | error_report("vhost_user_read() return %d, create session failed", | |
2584 | ret); | |
2585 | return ret; | |
efbfeb81 GA |
2586 | } |
2587 | ||
2588 | if (msg.hdr.request != VHOST_USER_CREATE_CRYPTO_SESSION) { | |
2589 | error_report("Received unexpected msg type. Expected %d received %d", | |
2590 | VHOST_USER_CREATE_CRYPTO_SESSION, msg.hdr.request); | |
025faa87 | 2591 | return -EPROTO; |
efbfeb81 GA |
2592 | } |
2593 | ||
2594 | if (msg.hdr.size != sizeof(msg.payload.session)) { | |
2595 | error_report("Received bad msg size."); | |
025faa87 | 2596 | return -EPROTO; |
efbfeb81 GA |
2597 | } |
2598 | ||
2599 | if (msg.payload.session.session_id < 0) { | |
2600 | error_report("Bad session id: %" PRId64 "", | |
2601 | msg.payload.session.session_id); | |
025faa87 | 2602 | return -EINVAL; |
efbfeb81 GA |
2603 | } |
2604 | *session_id = msg.payload.session.session_id; | |
2605 | ||
2606 | return 0; | |
2607 | } | |
2608 | ||
2609 | static int | |
2610 | vhost_user_crypto_close_session(struct vhost_dev *dev, uint64_t session_id) | |
2611 | { | |
025faa87 | 2612 | int ret; |
efbfeb81 GA |
2613 | bool crypto_session = virtio_has_feature(dev->protocol_features, |
2614 | VHOST_USER_PROTOCOL_F_CRYPTO_SESSION); | |
2615 | VhostUserMsg msg = { | |
2616 | .hdr.request = VHOST_USER_CLOSE_CRYPTO_SESSION, | |
2617 | .hdr.flags = VHOST_USER_VERSION, | |
2618 | .hdr.size = sizeof(msg.payload.u64), | |
2619 | }; | |
2620 | msg.payload.u64 = session_id; | |
2621 | ||
2622 | if (!crypto_session) { | |
2623 | error_report("vhost-user trying to send unhandled ioctl"); | |
025faa87 | 2624 | return -ENOTSUP; |
efbfeb81 GA |
2625 | } |
2626 | ||
025faa87 RK |
2627 | ret = vhost_user_write(dev, &msg, NULL, 0); |
2628 | if (ret < 0) { | |
2629 | error_report("vhost_user_write() return %d, close session failed", | |
2630 | ret); | |
2631 | return ret; | |
efbfeb81 GA |
2632 | } |
2633 | ||
2634 | return 0; | |
2635 | } | |
2636 | ||
552b2522 | 2637 | static bool vhost_user_no_private_memslots(struct vhost_dev *dev) |
988a2775 | 2638 | { |
552b2522 | 2639 | return true; |
988a2775 TB |
2640 | } |
2641 | ||
5ad204bf XY |
2642 | static int vhost_user_get_inflight_fd(struct vhost_dev *dev, |
2643 | uint16_t queue_size, | |
2644 | struct vhost_inflight *inflight) | |
2645 | { | |
2646 | void *addr; | |
2647 | int fd; | |
025faa87 | 2648 | int ret; |
5ad204bf XY |
2649 | struct vhost_user *u = dev->opaque; |
2650 | CharBackend *chr = u->user->chr; | |
2651 | VhostUserMsg msg = { | |
2652 | .hdr.request = VHOST_USER_GET_INFLIGHT_FD, | |
2653 | .hdr.flags = VHOST_USER_VERSION, | |
2654 | .payload.inflight.num_queues = dev->nvqs, | |
2655 | .payload.inflight.queue_size = queue_size, | |
2656 | .hdr.size = sizeof(msg.payload.inflight), | |
2657 | }; | |
2658 | ||
2659 | if (!virtio_has_feature(dev->protocol_features, | |
2660 | VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) { | |
2661 | return 0; | |
2662 | } | |
2663 | ||
025faa87 RK |
2664 | ret = vhost_user_write(dev, &msg, NULL, 0); |
2665 | if (ret < 0) { | |
2666 | return ret; | |
5ad204bf XY |
2667 | } |
2668 | ||
025faa87 RK |
2669 | ret = vhost_user_read(dev, &msg); |
2670 | if (ret < 0) { | |
2671 | return ret; | |
5ad204bf XY |
2672 | } |
2673 | ||
2674 | if (msg.hdr.request != VHOST_USER_GET_INFLIGHT_FD) { | |
2675 | error_report("Received unexpected msg type. " | |
2676 | "Expected %d received %d", | |
2677 | VHOST_USER_GET_INFLIGHT_FD, msg.hdr.request); | |
025faa87 | 2678 | return -EPROTO; |
5ad204bf XY |
2679 | } |
2680 | ||
2681 | if (msg.hdr.size != sizeof(msg.payload.inflight)) { | |
2682 | error_report("Received bad msg size."); | |
025faa87 | 2683 | return -EPROTO; |
5ad204bf XY |
2684 | } |
2685 | ||
2686 | if (!msg.payload.inflight.mmap_size) { | |
2687 | return 0; | |
2688 | } | |
2689 | ||
2690 | fd = qemu_chr_fe_get_msgfd(chr); | |
2691 | if (fd < 0) { | |
2692 | error_report("Failed to get mem fd"); | |
025faa87 | 2693 | return -EIO; |
5ad204bf XY |
2694 | } |
2695 | ||
2696 | addr = mmap(0, msg.payload.inflight.mmap_size, PROT_READ | PROT_WRITE, | |
2697 | MAP_SHARED, fd, msg.payload.inflight.mmap_offset); | |
2698 | ||
2699 | if (addr == MAP_FAILED) { | |
2700 | error_report("Failed to mmap mem fd"); | |
2701 | close(fd); | |
025faa87 | 2702 | return -EFAULT; |
5ad204bf XY |
2703 | } |
2704 | ||
2705 | inflight->addr = addr; | |
2706 | inflight->fd = fd; | |
2707 | inflight->size = msg.payload.inflight.mmap_size; | |
2708 | inflight->offset = msg.payload.inflight.mmap_offset; | |
2709 | inflight->queue_size = queue_size; | |
2710 | ||
2711 | return 0; | |
2712 | } | |
2713 | ||
2714 | static int vhost_user_set_inflight_fd(struct vhost_dev *dev, | |
2715 | struct vhost_inflight *inflight) | |
2716 | { | |
2717 | VhostUserMsg msg = { | |
2718 | .hdr.request = VHOST_USER_SET_INFLIGHT_FD, | |
2719 | .hdr.flags = VHOST_USER_VERSION, | |
2720 | .payload.inflight.mmap_size = inflight->size, | |
2721 | .payload.inflight.mmap_offset = inflight->offset, | |
2722 | .payload.inflight.num_queues = dev->nvqs, | |
2723 | .payload.inflight.queue_size = inflight->queue_size, | |
2724 | .hdr.size = sizeof(msg.payload.inflight), | |
2725 | }; | |
2726 | ||
2727 | if (!virtio_has_feature(dev->protocol_features, | |
2728 | VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) { | |
2729 | return 0; | |
2730 | } | |
2731 | ||
025faa87 | 2732 | return vhost_user_write(dev, &msg, &inflight->fd, 1); |
5ad204bf XY |
2733 | } |
2734 | ||
503e3554 AB |
2735 | static void vhost_user_state_destroy(gpointer data) |
2736 | { | |
2737 | VhostUserHostNotifier *n = (VhostUserHostNotifier *) data; | |
2738 | if (n) { | |
2739 | vhost_user_host_notifier_remove(n, NULL); | |
2740 | object_unparent(OBJECT(&n->mr)); | |
2741 | /* | |
2742 | * We can't free until vhost_user_host_notifier_remove has | |
2743 | * done it's thing so schedule the free with RCU. | |
2744 | */ | |
2745 | g_free_rcu(n, rcu); | |
2746 | } | |
2747 | } | |
2748 | ||
0b99f224 | 2749 | bool vhost_user_init(VhostUserState *user, CharBackend *chr, Error **errp) |
4d0cf552 | 2750 | { |
0b99f224 MAL |
2751 | if (user->chr) { |
2752 | error_setg(errp, "Cannot initialize vhost-user state"); | |
2753 | return false; | |
2754 | } | |
2755 | user->chr = chr; | |
6b0eff1a | 2756 | user->memory_slots = 0; |
503e3554 AB |
2757 | user->notifiers = g_ptr_array_new_full(VIRTIO_QUEUE_MAX / 4, |
2758 | &vhost_user_state_destroy); | |
0b99f224 | 2759 | return true; |
4d0cf552 TB |
2760 | } |
2761 | ||
2762 | void vhost_user_cleanup(VhostUserState *user) | |
2763 | { | |
0b99f224 MAL |
2764 | if (!user->chr) { |
2765 | return; | |
2766 | } | |
c6effa9c | 2767 | memory_region_transaction_begin(); |
503e3554 | 2768 | user->notifiers = (GPtrArray *) g_ptr_array_free(user->notifiers, true); |
c6effa9c | 2769 | memory_region_transaction_commit(); |
0b99f224 | 2770 | user->chr = NULL; |
4d0cf552 TB |
2771 | } |
2772 | ||
71e076a0 AB |
2773 | |
2774 | typedef struct { | |
2775 | vu_async_close_fn cb; | |
2776 | DeviceState *dev; | |
2777 | CharBackend *cd; | |
2778 | struct vhost_dev *vhost; | |
f02a4b8e | 2779 | IOEventHandler *event_cb; |
71e076a0 AB |
2780 | } VhostAsyncCallback; |
2781 | ||
2782 | static void vhost_user_async_close_bh(void *opaque) | |
2783 | { | |
2784 | VhostAsyncCallback *data = opaque; | |
2785 | struct vhost_dev *vhost = data->vhost; | |
2786 | ||
2787 | /* | |
2788 | * If the vhost_dev has been cleared in the meantime there is | |
2789 | * nothing left to do as some other path has completed the | |
2790 | * cleanup. | |
2791 | */ | |
2792 | if (vhost->vdev) { | |
2793 | data->cb(data->dev); | |
f02a4b8e LF |
2794 | } else if (data->event_cb) { |
2795 | qemu_chr_fe_set_handlers(data->cd, NULL, NULL, data->event_cb, | |
2796 | NULL, data->dev, NULL, true); | |
2797 | } | |
71e076a0 AB |
2798 | |
2799 | g_free(data); | |
2800 | } | |
2801 | ||
2802 | /* | |
2803 | * We only schedule the work if the machine is running. If suspended | |
2804 | * we want to keep all the in-flight data as is for migration | |
2805 | * purposes. | |
2806 | */ | |
2807 | void vhost_user_async_close(DeviceState *d, | |
2808 | CharBackend *chardev, struct vhost_dev *vhost, | |
f02a4b8e LF |
2809 | vu_async_close_fn cb, |
2810 | IOEventHandler *event_cb) | |
71e076a0 AB |
2811 | { |
2812 | if (!runstate_check(RUN_STATE_SHUTDOWN)) { | |
2813 | /* | |
2814 | * A close event may happen during a read/write, but vhost | |
2815 | * code assumes the vhost_dev remains setup, so delay the | |
2816 | * stop & clear. | |
2817 | */ | |
2818 | AioContext *ctx = qemu_get_current_aio_context(); | |
2819 | VhostAsyncCallback *data = g_new0(VhostAsyncCallback, 1); | |
2820 | ||
2821 | /* Save data for the callback */ | |
2822 | data->cb = cb; | |
2823 | data->dev = d; | |
2824 | data->cd = chardev; | |
2825 | data->vhost = vhost; | |
f02a4b8e | 2826 | data->event_cb = event_cb; |
71e076a0 AB |
2827 | |
2828 | /* Disable any further notifications on the chardev */ | |
2829 | qemu_chr_fe_set_handlers(chardev, | |
2830 | NULL, NULL, NULL, NULL, NULL, NULL, | |
2831 | false); | |
2832 | ||
2833 | aio_bh_schedule_oneshot(ctx, vhost_user_async_close_bh, data); | |
2834 | ||
2835 | /* | |
2836 | * Move vhost device to the stopped state. The vhost-user device | |
2837 | * will be clean up and disconnected in BH. This can be useful in | |
2838 | * the vhost migration code. If disconnect was caught there is an | |
2839 | * option for the general vhost code to get the dev state without | |
2840 | * knowing its type (in this case vhost-user). | |
2841 | * | |
2842 | * Note if the vhost device is fully cleared by the time we | |
2843 | * execute the bottom half we won't continue with the cleanup. | |
2844 | */ | |
2845 | vhost->started = false; | |
2846 | } | |
2847 | } | |
2848 | ||
923b8921 YW |
2849 | static int vhost_user_dev_start(struct vhost_dev *dev, bool started) |
2850 | { | |
2851 | if (!virtio_has_feature(dev->protocol_features, | |
2852 | VHOST_USER_PROTOCOL_F_STATUS)) { | |
2853 | return 0; | |
2854 | } | |
2855 | ||
2856 | /* Set device status only for last queue pair */ | |
2857 | if (dev->vq_index + dev->nvqs != dev->vq_index_end) { | |
2858 | return 0; | |
2859 | } | |
2860 | ||
2861 | if (started) { | |
2862 | return vhost_user_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | | |
2863 | VIRTIO_CONFIG_S_DRIVER | | |
2864 | VIRTIO_CONFIG_S_DRIVER_OK); | |
2865 | } else { | |
6f8be29e SH |
2866 | return 0; |
2867 | } | |
2868 | } | |
2869 | ||
2870 | static void vhost_user_reset_status(struct vhost_dev *dev) | |
2871 | { | |
2872 | /* Set device status only for last queue pair */ | |
2873 | if (dev->vq_index + dev->nvqs != dev->vq_index_end) { | |
2874 | return; | |
2875 | } | |
2876 | ||
2877 | if (virtio_has_feature(dev->protocol_features, | |
2878 | VHOST_USER_PROTOCOL_F_STATUS)) { | |
2879 | vhost_user_set_status(dev, 0); | |
923b8921 YW |
2880 | } |
2881 | } | |
2882 | ||
cda83adc HC |
2883 | static bool vhost_user_supports_device_state(struct vhost_dev *dev) |
2884 | { | |
2885 | return virtio_has_feature(dev->protocol_features, | |
2886 | VHOST_USER_PROTOCOL_F_DEVICE_STATE); | |
2887 | } | |
2888 | ||
2889 | static int vhost_user_set_device_state_fd(struct vhost_dev *dev, | |
2890 | VhostDeviceStateDirection direction, | |
2891 | VhostDeviceStatePhase phase, | |
2892 | int fd, | |
2893 | int *reply_fd, | |
2894 | Error **errp) | |
2895 | { | |
2896 | int ret; | |
2897 | struct vhost_user *vu = dev->opaque; | |
2898 | VhostUserMsg msg = { | |
2899 | .hdr = { | |
2900 | .request = VHOST_USER_SET_DEVICE_STATE_FD, | |
2901 | .flags = VHOST_USER_VERSION, | |
2902 | .size = sizeof(msg.payload.transfer_state), | |
2903 | }, | |
2904 | .payload.transfer_state = { | |
2905 | .direction = direction, | |
2906 | .phase = phase, | |
2907 | }, | |
2908 | }; | |
2909 | ||
2910 | *reply_fd = -1; | |
2911 | ||
2912 | if (!vhost_user_supports_device_state(dev)) { | |
2913 | close(fd); | |
2914 | error_setg(errp, "Back-end does not support migration state transfer"); | |
2915 | return -ENOTSUP; | |
2916 | } | |
2917 | ||
2918 | ret = vhost_user_write(dev, &msg, &fd, 1); | |
2919 | close(fd); | |
2920 | if (ret < 0) { | |
2921 | error_setg_errno(errp, -ret, | |
2922 | "Failed to send SET_DEVICE_STATE_FD message"); | |
2923 | return ret; | |
2924 | } | |
2925 | ||
2926 | ret = vhost_user_read(dev, &msg); | |
2927 | if (ret < 0) { | |
2928 | error_setg_errno(errp, -ret, | |
2929 | "Failed to receive SET_DEVICE_STATE_FD reply"); | |
2930 | return ret; | |
2931 | } | |
2932 | ||
2933 | if (msg.hdr.request != VHOST_USER_SET_DEVICE_STATE_FD) { | |
2934 | error_setg(errp, | |
2935 | "Received unexpected message type, expected %d, received %d", | |
2936 | VHOST_USER_SET_DEVICE_STATE_FD, msg.hdr.request); | |
2937 | return -EPROTO; | |
2938 | } | |
2939 | ||
2940 | if (msg.hdr.size != sizeof(msg.payload.u64)) { | |
2941 | error_setg(errp, | |
2942 | "Received bad message size, expected %zu, received %" PRIu32, | |
2943 | sizeof(msg.payload.u64), msg.hdr.size); | |
2944 | return -EPROTO; | |
2945 | } | |
2946 | ||
2947 | if ((msg.payload.u64 & 0xff) != 0) { | |
2948 | error_setg(errp, "Back-end did not accept migration state transfer"); | |
2949 | return -EIO; | |
2950 | } | |
2951 | ||
2952 | if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK)) { | |
2953 | *reply_fd = qemu_chr_fe_get_msgfd(vu->user->chr); | |
2954 | if (*reply_fd < 0) { | |
2955 | error_setg(errp, | |
2956 | "Failed to get back-end-provided transfer pipe FD"); | |
2957 | *reply_fd = -1; | |
2958 | return -EIO; | |
2959 | } | |
2960 | } | |
2961 | ||
2962 | return 0; | |
2963 | } | |
2964 | ||
2965 | static int vhost_user_check_device_state(struct vhost_dev *dev, Error **errp) | |
2966 | { | |
2967 | int ret; | |
2968 | VhostUserMsg msg = { | |
2969 | .hdr = { | |
2970 | .request = VHOST_USER_CHECK_DEVICE_STATE, | |
2971 | .flags = VHOST_USER_VERSION, | |
2972 | .size = 0, | |
2973 | }, | |
2974 | }; | |
2975 | ||
2976 | if (!vhost_user_supports_device_state(dev)) { | |
2977 | error_setg(errp, "Back-end does not support migration state transfer"); | |
2978 | return -ENOTSUP; | |
2979 | } | |
2980 | ||
2981 | ret = vhost_user_write(dev, &msg, NULL, 0); | |
2982 | if (ret < 0) { | |
2983 | error_setg_errno(errp, -ret, | |
2984 | "Failed to send CHECK_DEVICE_STATE message"); | |
2985 | return ret; | |
2986 | } | |
2987 | ||
2988 | ret = vhost_user_read(dev, &msg); | |
2989 | if (ret < 0) { | |
2990 | error_setg_errno(errp, -ret, | |
2991 | "Failed to receive CHECK_DEVICE_STATE reply"); | |
2992 | return ret; | |
2993 | } | |
2994 | ||
2995 | if (msg.hdr.request != VHOST_USER_CHECK_DEVICE_STATE) { | |
2996 | error_setg(errp, | |
2997 | "Received unexpected message type, expected %d, received %d", | |
2998 | VHOST_USER_CHECK_DEVICE_STATE, msg.hdr.request); | |
2999 | return -EPROTO; | |
3000 | } | |
3001 | ||
3002 | if (msg.hdr.size != sizeof(msg.payload.u64)) { | |
3003 | error_setg(errp, | |
3004 | "Received bad message size, expected %zu, received %" PRIu32, | |
3005 | sizeof(msg.payload.u64), msg.hdr.size); | |
3006 | return -EPROTO; | |
3007 | } | |
3008 | ||
3009 | if (msg.payload.u64 != 0) { | |
3010 | error_setg(errp, "Back-end failed to process its internal state"); | |
3011 | return -EIO; | |
3012 | } | |
3013 | ||
3014 | return 0; | |
3015 | } | |
3016 | ||
5f6f6664 NN |
3017 | const VhostOps user_ops = { |
3018 | .backend_type = VHOST_BACKEND_TYPE_USER, | |
4d0cf552 TB |
3019 | .vhost_backend_init = vhost_user_backend_init, |
3020 | .vhost_backend_cleanup = vhost_user_backend_cleanup, | |
2ce68e4c | 3021 | .vhost_backend_memslots_limit = vhost_user_memslots_limit, |
552b2522 | 3022 | .vhost_backend_no_private_memslots = vhost_user_no_private_memslots, |
21e70425 MAL |
3023 | .vhost_set_log_base = vhost_user_set_log_base, |
3024 | .vhost_set_mem_table = vhost_user_set_mem_table, | |
3025 | .vhost_set_vring_addr = vhost_user_set_vring_addr, | |
3026 | .vhost_set_vring_endian = vhost_user_set_vring_endian, | |
3027 | .vhost_set_vring_num = vhost_user_set_vring_num, | |
3028 | .vhost_set_vring_base = vhost_user_set_vring_base, | |
3029 | .vhost_get_vring_base = vhost_user_get_vring_base, | |
3030 | .vhost_set_vring_kick = vhost_user_set_vring_kick, | |
3031 | .vhost_set_vring_call = vhost_user_set_vring_call, | |
60dc3c5b | 3032 | .vhost_set_vring_err = vhost_user_set_vring_err, |
21e70425 MAL |
3033 | .vhost_set_features = vhost_user_set_features, |
3034 | .vhost_get_features = vhost_user_get_features, | |
3035 | .vhost_set_owner = vhost_user_set_owner, | |
3036 | .vhost_reset_device = vhost_user_reset_device, | |
3037 | .vhost_get_vq_index = vhost_user_get_vq_index, | |
3038 | .vhost_set_vring_enable = vhost_user_set_vring_enable, | |
1be0ac21 | 3039 | .vhost_requires_shm_log = vhost_user_requires_shm_log, |
3e866365 | 3040 | .vhost_migration_done = vhost_user_migration_done, |
c5f048d8 | 3041 | .vhost_net_set_mtu = vhost_user_net_set_mtu, |
6dcdd06e MC |
3042 | .vhost_set_iotlb_callback = vhost_user_set_iotlb_callback, |
3043 | .vhost_send_device_iotlb_msg = vhost_user_send_device_iotlb_msg, | |
4c3e257b CL |
3044 | .vhost_get_config = vhost_user_get_config, |
3045 | .vhost_set_config = vhost_user_set_config, | |
efbfeb81 GA |
3046 | .vhost_crypto_create_session = vhost_user_crypto_create_session, |
3047 | .vhost_crypto_close_session = vhost_user_crypto_close_session, | |
5ad204bf XY |
3048 | .vhost_get_inflight_fd = vhost_user_get_inflight_fd, |
3049 | .vhost_set_inflight_fd = vhost_user_set_inflight_fd, | |
923b8921 | 3050 | .vhost_dev_start = vhost_user_dev_start, |
6f8be29e | 3051 | .vhost_reset_status = vhost_user_reset_status, |
cda83adc HC |
3052 | .vhost_supports_device_state = vhost_user_supports_device_state, |
3053 | .vhost_set_device_state_fd = vhost_user_set_device_state_fd, | |
3054 | .vhost_check_device_state = vhost_user_check_device_state, | |
fc57fd99 | 3055 | }; |