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418026ca FZ |
1 | /* |
2 | * VFIO utility | |
3 | * | |
4 | * Copyright 2016 - 2018 Red Hat, Inc. | |
5 | * | |
6 | * Authors: | |
7 | * Fam Zheng <famz@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
10 | * See the COPYING file in the top-level directory. | |
11 | */ | |
12 | ||
13 | #include "qemu/osdep.h" | |
14 | #include <sys/ioctl.h> | |
15 | #include <linux/vfio.h> | |
16 | #include "qapi/error.h" | |
17 | #include "exec/ramlist.h" | |
18 | #include "exec/cpu-common.h" | |
19 | #include "trace.h" | |
418026ca FZ |
20 | #include "qemu/error-report.h" |
21 | #include "standard-headers/linux/pci_regs.h" | |
22 | #include "qemu/event_notifier.h" | |
23 | #include "qemu/vfio-helpers.h" | |
6e8a355d | 24 | #include "qemu/lockable.h" |
418026ca FZ |
25 | #include "trace.h" |
26 | ||
27 | #define QEMU_VFIO_DEBUG 0 | |
28 | ||
29 | #define QEMU_VFIO_IOVA_MIN 0x10000ULL | |
30 | /* XXX: Once VFIO exposes the iova bit width in the IOMMU capability interface, | |
31 | * we can use a runtime limit; alternatively it's also possible to do platform | |
32 | * specific detection by reading sysfs entries. Until then, 39 is a safe bet. | |
33 | **/ | |
34 | #define QEMU_VFIO_IOVA_MAX (1ULL << 39) | |
35 | ||
36 | typedef struct { | |
37 | /* Page aligned addr. */ | |
38 | void *host; | |
39 | size_t size; | |
40 | uint64_t iova; | |
41 | } IOVAMapping; | |
42 | ||
4487d420 EA |
43 | struct IOVARange { |
44 | uint64_t start; | |
45 | uint64_t end; | |
46 | }; | |
47 | ||
418026ca FZ |
48 | struct QEMUVFIOState { |
49 | QemuMutex lock; | |
50 | ||
51 | /* These fields are protected by BQL */ | |
52 | int container; | |
53 | int group; | |
54 | int device; | |
55 | RAMBlockNotifier ram_notifier; | |
56 | struct vfio_region_info config_region_info, bar_region_info[6]; | |
4487d420 EA |
57 | struct IOVARange *usable_iova_ranges; |
58 | uint8_t nb_iova_ranges; | |
418026ca FZ |
59 | |
60 | /* These fields are protected by @lock */ | |
61 | /* VFIO's IO virtual address space is managed by splitting into a few | |
62 | * sections: | |
63 | * | |
64 | * --------------- <= 0 | |
65 | * |xxxxxxxxxxxxx| | |
66 | * |-------------| <= QEMU_VFIO_IOVA_MIN | |
67 | * | | | |
68 | * | Fixed | | |
69 | * | | | |
70 | * |-------------| <= low_water_mark | |
71 | * | | | |
72 | * | Free | | |
73 | * | | | |
74 | * |-------------| <= high_water_mark | |
75 | * | | | |
76 | * | Temp | | |
77 | * | | | |
78 | * |-------------| <= QEMU_VFIO_IOVA_MAX | |
79 | * |xxxxxxxxxxxxx| | |
80 | * |xxxxxxxxxxxxx| | |
81 | * --------------- | |
82 | * | |
83 | * - Addresses lower than QEMU_VFIO_IOVA_MIN are reserved as invalid; | |
84 | * | |
85 | * - Fixed mappings of HVAs are assigned "low" IOVAs in the range of | |
86 | * [QEMU_VFIO_IOVA_MIN, low_water_mark). Once allocated they will not be | |
87 | * reclaimed - low_water_mark never shrinks; | |
88 | * | |
89 | * - IOVAs in range [low_water_mark, high_water_mark) are free; | |
90 | * | |
91 | * - IOVAs in range [high_water_mark, QEMU_VFIO_IOVA_MAX) are volatile | |
92 | * mappings. At each qemu_vfio_dma_reset_temporary() call, the whole area | |
93 | * is recycled. The caller should make sure I/O's depending on these | |
94 | * mappings are completed before calling. | |
95 | **/ | |
96 | uint64_t low_water_mark; | |
97 | uint64_t high_water_mark; | |
98 | IOVAMapping *mappings; | |
99 | int nr_mappings; | |
100 | }; | |
101 | ||
102 | /** | |
103 | * Find group file by PCI device address as specified @device, and return the | |
104 | * path. The returned string is owned by caller and should be g_free'ed later. | |
105 | */ | |
106 | static char *sysfs_find_group_file(const char *device, Error **errp) | |
107 | { | |
108 | char *sysfs_link; | |
109 | char *sysfs_group; | |
110 | char *p; | |
111 | char *path = NULL; | |
112 | ||
113 | sysfs_link = g_strdup_printf("/sys/bus/pci/devices/%s/iommu_group", device); | |
78d8c99e | 114 | sysfs_group = g_malloc0(PATH_MAX); |
418026ca FZ |
115 | if (readlink(sysfs_link, sysfs_group, PATH_MAX - 1) == -1) { |
116 | error_setg_errno(errp, errno, "Failed to find iommu group sysfs path"); | |
117 | goto out; | |
118 | } | |
119 | p = strrchr(sysfs_group, '/'); | |
120 | if (!p) { | |
121 | error_setg(errp, "Failed to find iommu group number"); | |
122 | goto out; | |
123 | } | |
124 | ||
125 | path = g_strdup_printf("/dev/vfio/%s", p + 1); | |
126 | out: | |
127 | g_free(sysfs_link); | |
128 | g_free(sysfs_group); | |
129 | return path; | |
130 | } | |
131 | ||
132 | static inline void assert_bar_index_valid(QEMUVFIOState *s, int index) | |
133 | { | |
134 | assert(index >= 0 && index < ARRAY_SIZE(s->bar_region_info)); | |
135 | } | |
136 | ||
137 | static int qemu_vfio_pci_init_bar(QEMUVFIOState *s, int index, Error **errp) | |
138 | { | |
139 | assert_bar_index_valid(s, index); | |
140 | s->bar_region_info[index] = (struct vfio_region_info) { | |
141 | .index = VFIO_PCI_BAR0_REGION_INDEX + index, | |
142 | .argsz = sizeof(struct vfio_region_info), | |
143 | }; | |
144 | if (ioctl(s->device, VFIO_DEVICE_GET_REGION_INFO, &s->bar_region_info[index])) { | |
145 | error_setg_errno(errp, errno, "Failed to get BAR region info"); | |
146 | return -errno; | |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | /** | |
153 | * Map a PCI bar area. | |
154 | */ | |
155 | void *qemu_vfio_pci_map_bar(QEMUVFIOState *s, int index, | |
b02c01a5 | 156 | uint64_t offset, uint64_t size, int prot, |
418026ca FZ |
157 | Error **errp) |
158 | { | |
159 | void *p; | |
160 | assert_bar_index_valid(s, index); | |
161 | p = mmap(NULL, MIN(size, s->bar_region_info[index].size - offset), | |
b02c01a5 | 162 | prot, MAP_SHARED, |
418026ca FZ |
163 | s->device, s->bar_region_info[index].offset + offset); |
164 | if (p == MAP_FAILED) { | |
165 | error_setg_errno(errp, errno, "Failed to map BAR region"); | |
166 | p = NULL; | |
167 | } | |
168 | return p; | |
169 | } | |
170 | ||
171 | /** | |
172 | * Unmap a PCI bar area. | |
173 | */ | |
174 | void qemu_vfio_pci_unmap_bar(QEMUVFIOState *s, int index, void *bar, | |
175 | uint64_t offset, uint64_t size) | |
176 | { | |
177 | if (bar) { | |
178 | munmap(bar, MIN(size, s->bar_region_info[index].size - offset)); | |
179 | } | |
180 | } | |
181 | ||
182 | /** | |
a6da793a | 183 | * Initialize device IRQ with @irq_type and register an event notifier. |
418026ca FZ |
184 | */ |
185 | int qemu_vfio_pci_init_irq(QEMUVFIOState *s, EventNotifier *e, | |
186 | int irq_type, Error **errp) | |
187 | { | |
188 | int r; | |
189 | struct vfio_irq_set *irq_set; | |
190 | size_t irq_set_size; | |
191 | struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info) }; | |
192 | ||
193 | irq_info.index = irq_type; | |
194 | if (ioctl(s->device, VFIO_DEVICE_GET_IRQ_INFO, &irq_info)) { | |
195 | error_setg_errno(errp, errno, "Failed to get device interrupt info"); | |
196 | return -errno; | |
197 | } | |
198 | if (!(irq_info.flags & VFIO_IRQ_INFO_EVENTFD)) { | |
199 | error_setg(errp, "Device interrupt doesn't support eventfd"); | |
200 | return -EINVAL; | |
201 | } | |
202 | ||
203 | irq_set_size = sizeof(*irq_set) + sizeof(int); | |
204 | irq_set = g_malloc0(irq_set_size); | |
205 | ||
206 | /* Get to a known IRQ state */ | |
207 | *irq_set = (struct vfio_irq_set) { | |
208 | .argsz = irq_set_size, | |
209 | .flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER, | |
210 | .index = irq_info.index, | |
211 | .start = 0, | |
212 | .count = 1, | |
213 | }; | |
214 | ||
215 | *(int *)&irq_set->data = event_notifier_get_fd(e); | |
216 | r = ioctl(s->device, VFIO_DEVICE_SET_IRQS, irq_set); | |
217 | g_free(irq_set); | |
218 | if (r) { | |
219 | error_setg_errno(errp, errno, "Failed to setup device interrupt"); | |
220 | return -errno; | |
221 | } | |
222 | return 0; | |
223 | } | |
224 | ||
225 | static int qemu_vfio_pci_read_config(QEMUVFIOState *s, void *buf, | |
226 | int size, int ofs) | |
227 | { | |
228 | int ret; | |
229 | ||
230 | do { | |
231 | ret = pread(s->device, buf, size, s->config_region_info.offset + ofs); | |
232 | } while (ret == -1 && errno == EINTR); | |
233 | return ret == size ? 0 : -errno; | |
234 | } | |
235 | ||
236 | static int qemu_vfio_pci_write_config(QEMUVFIOState *s, void *buf, int size, int ofs) | |
237 | { | |
238 | int ret; | |
239 | ||
240 | do { | |
241 | ret = pwrite(s->device, buf, size, s->config_region_info.offset + ofs); | |
242 | } while (ret == -1 && errno == EINTR); | |
243 | return ret == size ? 0 : -errno; | |
244 | } | |
245 | ||
4487d420 EA |
246 | static void collect_usable_iova_ranges(QEMUVFIOState *s, void *buf) |
247 | { | |
248 | struct vfio_iommu_type1_info *info = (struct vfio_iommu_type1_info *)buf; | |
249 | struct vfio_info_cap_header *cap = (void *)buf + info->cap_offset; | |
250 | struct vfio_iommu_type1_info_cap_iova_range *cap_iova_range; | |
251 | int i; | |
252 | ||
253 | while (cap->id != VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE) { | |
254 | if (!cap->next) { | |
255 | return; | |
256 | } | |
257 | cap = (struct vfio_info_cap_header *)(buf + cap->next); | |
258 | } | |
259 | ||
260 | cap_iova_range = (struct vfio_iommu_type1_info_cap_iova_range *)cap; | |
261 | ||
262 | s->nb_iova_ranges = cap_iova_range->nr_iovas; | |
263 | if (s->nb_iova_ranges > 1) { | |
264 | s->usable_iova_ranges = | |
265 | g_realloc(s->usable_iova_ranges, | |
266 | s->nb_iova_ranges * sizeof(struct IOVARange)); | |
267 | } | |
268 | ||
269 | for (i = 0; i < s->nb_iova_ranges; i++) { | |
270 | s->usable_iova_ranges[i].start = cap_iova_range->iova_ranges[i].start; | |
271 | s->usable_iova_ranges[i].end = cap_iova_range->iova_ranges[i].end; | |
272 | } | |
273 | } | |
274 | ||
418026ca FZ |
275 | static int qemu_vfio_init_pci(QEMUVFIOState *s, const char *device, |
276 | Error **errp) | |
277 | { | |
278 | int ret; | |
279 | int i; | |
280 | uint16_t pci_cmd; | |
281 | struct vfio_group_status group_status = { .argsz = sizeof(group_status) }; | |
4487d420 EA |
282 | struct vfio_iommu_type1_info *iommu_info = NULL; |
283 | size_t iommu_info_size = sizeof(*iommu_info); | |
418026ca FZ |
284 | struct vfio_device_info device_info = { .argsz = sizeof(device_info) }; |
285 | char *group_file = NULL; | |
286 | ||
4487d420 EA |
287 | s->usable_iova_ranges = NULL; |
288 | ||
418026ca FZ |
289 | /* Create a new container */ |
290 | s->container = open("/dev/vfio/vfio", O_RDWR); | |
291 | ||
292 | if (s->container == -1) { | |
293 | error_setg_errno(errp, errno, "Failed to open /dev/vfio/vfio"); | |
294 | return -errno; | |
295 | } | |
296 | if (ioctl(s->container, VFIO_GET_API_VERSION) != VFIO_API_VERSION) { | |
297 | error_setg(errp, "Invalid VFIO version"); | |
298 | ret = -EINVAL; | |
299 | goto fail_container; | |
300 | } | |
301 | ||
302 | if (!ioctl(s->container, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU)) { | |
303 | error_setg_errno(errp, errno, "VFIO IOMMU check failed"); | |
304 | ret = -EINVAL; | |
305 | goto fail_container; | |
306 | } | |
307 | ||
308 | /* Open the group */ | |
309 | group_file = sysfs_find_group_file(device, errp); | |
310 | if (!group_file) { | |
311 | ret = -EINVAL; | |
312 | goto fail_container; | |
313 | } | |
314 | ||
315 | s->group = open(group_file, O_RDWR); | |
316 | if (s->group == -1) { | |
317 | error_setg_errno(errp, errno, "Failed to open VFIO group file: %s", | |
318 | group_file); | |
319 | g_free(group_file); | |
320 | ret = -errno; | |
321 | goto fail_container; | |
322 | } | |
323 | g_free(group_file); | |
324 | ||
325 | /* Test the group is viable and available */ | |
326 | if (ioctl(s->group, VFIO_GROUP_GET_STATUS, &group_status)) { | |
327 | error_setg_errno(errp, errno, "Failed to get VFIO group status"); | |
328 | ret = -errno; | |
329 | goto fail; | |
330 | } | |
331 | ||
332 | if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE)) { | |
333 | error_setg(errp, "VFIO group is not viable"); | |
334 | ret = -EINVAL; | |
335 | goto fail; | |
336 | } | |
337 | ||
338 | /* Add the group to the container */ | |
339 | if (ioctl(s->group, VFIO_GROUP_SET_CONTAINER, &s->container)) { | |
340 | error_setg_errno(errp, errno, "Failed to add group to VFIO container"); | |
341 | ret = -errno; | |
342 | goto fail; | |
343 | } | |
344 | ||
345 | /* Enable the IOMMU model we want */ | |
346 | if (ioctl(s->container, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU)) { | |
347 | error_setg_errno(errp, errno, "Failed to set VFIO IOMMU type"); | |
348 | ret = -errno; | |
349 | goto fail; | |
350 | } | |
351 | ||
4487d420 EA |
352 | iommu_info = g_malloc0(iommu_info_size); |
353 | iommu_info->argsz = iommu_info_size; | |
354 | ||
418026ca | 355 | /* Get additional IOMMU info */ |
4487d420 | 356 | if (ioctl(s->container, VFIO_IOMMU_GET_INFO, iommu_info)) { |
418026ca FZ |
357 | error_setg_errno(errp, errno, "Failed to get IOMMU info"); |
358 | ret = -errno; | |
359 | goto fail; | |
360 | } | |
361 | ||
4487d420 EA |
362 | /* |
363 | * if the kernel does not report usable IOVA regions, choose | |
364 | * the legacy [QEMU_VFIO_IOVA_MIN, QEMU_VFIO_IOVA_MAX -1] region | |
365 | */ | |
366 | s->nb_iova_ranges = 1; | |
367 | s->usable_iova_ranges = g_new0(struct IOVARange, 1); | |
368 | s->usable_iova_ranges[0].start = QEMU_VFIO_IOVA_MIN; | |
369 | s->usable_iova_ranges[0].end = QEMU_VFIO_IOVA_MAX - 1; | |
370 | ||
371 | if (iommu_info->argsz > iommu_info_size) { | |
372 | iommu_info_size = iommu_info->argsz; | |
373 | iommu_info = g_realloc(iommu_info, iommu_info_size); | |
374 | if (ioctl(s->container, VFIO_IOMMU_GET_INFO, iommu_info)) { | |
375 | ret = -errno; | |
376 | goto fail; | |
377 | } | |
378 | collect_usable_iova_ranges(s, iommu_info); | |
379 | } | |
380 | ||
418026ca FZ |
381 | s->device = ioctl(s->group, VFIO_GROUP_GET_DEVICE_FD, device); |
382 | ||
383 | if (s->device < 0) { | |
384 | error_setg_errno(errp, errno, "Failed to get device fd"); | |
385 | ret = -errno; | |
386 | goto fail; | |
387 | } | |
388 | ||
389 | /* Test and setup the device */ | |
390 | if (ioctl(s->device, VFIO_DEVICE_GET_INFO, &device_info)) { | |
391 | error_setg_errno(errp, errno, "Failed to get device info"); | |
392 | ret = -errno; | |
393 | goto fail; | |
394 | } | |
395 | ||
396 | if (device_info.num_regions < VFIO_PCI_CONFIG_REGION_INDEX) { | |
397 | error_setg(errp, "Invalid device regions"); | |
398 | ret = -EINVAL; | |
399 | goto fail; | |
400 | } | |
401 | ||
402 | s->config_region_info = (struct vfio_region_info) { | |
403 | .index = VFIO_PCI_CONFIG_REGION_INDEX, | |
404 | .argsz = sizeof(struct vfio_region_info), | |
405 | }; | |
406 | if (ioctl(s->device, VFIO_DEVICE_GET_REGION_INFO, &s->config_region_info)) { | |
407 | error_setg_errno(errp, errno, "Failed to get config region info"); | |
408 | ret = -errno; | |
409 | goto fail; | |
410 | } | |
411 | ||
9e722ebc | 412 | for (i = 0; i < ARRAY_SIZE(s->bar_region_info); i++) { |
418026ca FZ |
413 | ret = qemu_vfio_pci_init_bar(s, i, errp); |
414 | if (ret) { | |
415 | goto fail; | |
416 | } | |
417 | } | |
418 | ||
419 | /* Enable bus master */ | |
420 | ret = qemu_vfio_pci_read_config(s, &pci_cmd, sizeof(pci_cmd), PCI_COMMAND); | |
421 | if (ret) { | |
422 | goto fail; | |
423 | } | |
424 | pci_cmd |= PCI_COMMAND_MASTER; | |
425 | ret = qemu_vfio_pci_write_config(s, &pci_cmd, sizeof(pci_cmd), PCI_COMMAND); | |
426 | if (ret) { | |
427 | goto fail; | |
428 | } | |
4487d420 | 429 | g_free(iommu_info); |
418026ca FZ |
430 | return 0; |
431 | fail: | |
4487d420 EA |
432 | g_free(s->usable_iova_ranges); |
433 | s->usable_iova_ranges = NULL; | |
434 | s->nb_iova_ranges = 0; | |
435 | g_free(iommu_info); | |
418026ca FZ |
436 | close(s->group); |
437 | fail_container: | |
438 | close(s->container); | |
439 | return ret; | |
440 | } | |
441 | ||
442 | static void qemu_vfio_ram_block_added(RAMBlockNotifier *n, | |
443 | void *host, size_t size) | |
444 | { | |
445 | QEMUVFIOState *s = container_of(n, QEMUVFIOState, ram_notifier); | |
446 | trace_qemu_vfio_ram_block_added(s, host, size); | |
447 | qemu_vfio_dma_map(s, host, size, false, NULL); | |
448 | } | |
449 | ||
450 | static void qemu_vfio_ram_block_removed(RAMBlockNotifier *n, | |
451 | void *host, size_t size) | |
452 | { | |
453 | QEMUVFIOState *s = container_of(n, QEMUVFIOState, ram_notifier); | |
454 | if (host) { | |
455 | trace_qemu_vfio_ram_block_removed(s, host, size); | |
456 | qemu_vfio_dma_unmap(s, host); | |
457 | } | |
458 | } | |
459 | ||
754cb9c0 | 460 | static int qemu_vfio_init_ramblock(RAMBlock *rb, void *opaque) |
418026ca | 461 | { |
754cb9c0 YK |
462 | void *host_addr = qemu_ram_get_host_addr(rb); |
463 | ram_addr_t length = qemu_ram_get_used_length(rb); | |
418026ca FZ |
464 | int ret; |
465 | QEMUVFIOState *s = opaque; | |
466 | ||
467 | if (!host_addr) { | |
468 | return 0; | |
469 | } | |
470 | ret = qemu_vfio_dma_map(s, host_addr, length, false, NULL); | |
471 | if (ret) { | |
472 | fprintf(stderr, "qemu_vfio_init_ramblock: failed %p %" PRId64 "\n", | |
473 | host_addr, (uint64_t)length); | |
474 | } | |
475 | return 0; | |
476 | } | |
477 | ||
478 | static void qemu_vfio_open_common(QEMUVFIOState *s) | |
479 | { | |
549b50a3 | 480 | qemu_mutex_init(&s->lock); |
418026ca FZ |
481 | s->ram_notifier.ram_block_added = qemu_vfio_ram_block_added; |
482 | s->ram_notifier.ram_block_removed = qemu_vfio_ram_block_removed; | |
483 | ram_block_notifier_add(&s->ram_notifier); | |
484 | s->low_water_mark = QEMU_VFIO_IOVA_MIN; | |
485 | s->high_water_mark = QEMU_VFIO_IOVA_MAX; | |
486 | qemu_ram_foreach_block(qemu_vfio_init_ramblock, s); | |
418026ca FZ |
487 | } |
488 | ||
489 | /** | |
490 | * Open a PCI device, e.g. "0000:00:01.0". | |
491 | */ | |
492 | QEMUVFIOState *qemu_vfio_open_pci(const char *device, Error **errp) | |
493 | { | |
494 | int r; | |
495 | QEMUVFIOState *s = g_new0(QEMUVFIOState, 1); | |
496 | ||
497 | r = qemu_vfio_init_pci(s, device, errp); | |
498 | if (r) { | |
499 | g_free(s); | |
500 | return NULL; | |
501 | } | |
502 | qemu_vfio_open_common(s); | |
503 | return s; | |
504 | } | |
505 | ||
506 | static void qemu_vfio_dump_mapping(IOVAMapping *m) | |
507 | { | |
508 | if (QEMU_VFIO_DEBUG) { | |
509 | printf(" vfio mapping %p %" PRIx64 " to %" PRIx64 "\n", m->host, | |
510 | (uint64_t)m->size, (uint64_t)m->iova); | |
511 | } | |
512 | } | |
513 | ||
514 | static void qemu_vfio_dump_mappings(QEMUVFIOState *s) | |
515 | { | |
516 | int i; | |
517 | ||
518 | if (QEMU_VFIO_DEBUG) { | |
519 | printf("vfio mappings\n"); | |
520 | for (i = 0; i < s->nr_mappings; ++i) { | |
521 | qemu_vfio_dump_mapping(&s->mappings[i]); | |
522 | } | |
523 | } | |
524 | } | |
525 | ||
526 | /** | |
527 | * Find the mapping entry that contains [host, host + size) and set @index to | |
528 | * the position. If no entry contains it, @index is the position _after_ which | |
529 | * to insert the new mapping. IOW, it is the index of the largest element that | |
530 | * is smaller than @host, or -1 if no entry is. | |
531 | */ | |
532 | static IOVAMapping *qemu_vfio_find_mapping(QEMUVFIOState *s, void *host, | |
533 | int *index) | |
534 | { | |
535 | IOVAMapping *p = s->mappings; | |
536 | IOVAMapping *q = p ? p + s->nr_mappings - 1 : NULL; | |
537 | IOVAMapping *mid; | |
538 | trace_qemu_vfio_find_mapping(s, host); | |
539 | if (!p) { | |
540 | *index = -1; | |
541 | return NULL; | |
542 | } | |
543 | while (true) { | |
544 | mid = p + (q - p) / 2; | |
545 | if (mid == p) { | |
546 | break; | |
547 | } | |
548 | if (mid->host > host) { | |
549 | q = mid; | |
550 | } else if (mid->host < host) { | |
551 | p = mid; | |
552 | } else { | |
553 | break; | |
554 | } | |
555 | } | |
556 | if (mid->host > host) { | |
557 | mid--; | |
558 | } else if (mid < &s->mappings[s->nr_mappings - 1] | |
559 | && (mid + 1)->host <= host) { | |
560 | mid++; | |
561 | } | |
562 | *index = mid - &s->mappings[0]; | |
563 | if (mid >= &s->mappings[0] && | |
564 | mid->host <= host && mid->host + mid->size > host) { | |
565 | assert(mid < &s->mappings[s->nr_mappings]); | |
566 | return mid; | |
567 | } | |
568 | /* At this point *index + 1 is the right position to insert the new | |
569 | * mapping.*/ | |
570 | return NULL; | |
571 | } | |
572 | ||
573 | /** | |
a6da793a | 574 | * Allocate IOVA and create a new mapping record and insert it in @s. |
418026ca FZ |
575 | */ |
576 | static IOVAMapping *qemu_vfio_add_mapping(QEMUVFIOState *s, | |
577 | void *host, size_t size, | |
578 | int index, uint64_t iova) | |
579 | { | |
580 | int shift; | |
581 | IOVAMapping m = {.host = host, .size = size, .iova = iova}; | |
582 | IOVAMapping *insert; | |
583 | ||
038adc2f WY |
584 | assert(QEMU_IS_ALIGNED(size, qemu_real_host_page_size)); |
585 | assert(QEMU_IS_ALIGNED(s->low_water_mark, qemu_real_host_page_size)); | |
586 | assert(QEMU_IS_ALIGNED(s->high_water_mark, qemu_real_host_page_size)); | |
418026ca FZ |
587 | trace_qemu_vfio_new_mapping(s, host, size, index, iova); |
588 | ||
589 | assert(index >= 0); | |
590 | s->nr_mappings++; | |
d29eb678 | 591 | s->mappings = g_renew(IOVAMapping, s->mappings, s->nr_mappings); |
418026ca FZ |
592 | insert = &s->mappings[index]; |
593 | shift = s->nr_mappings - index - 1; | |
594 | if (shift) { | |
595 | memmove(insert + 1, insert, shift * sizeof(s->mappings[0])); | |
596 | } | |
597 | *insert = m; | |
598 | return insert; | |
599 | } | |
600 | ||
601 | /* Do the DMA mapping with VFIO. */ | |
602 | static int qemu_vfio_do_mapping(QEMUVFIOState *s, void *host, size_t size, | |
603 | uint64_t iova) | |
604 | { | |
605 | struct vfio_iommu_type1_dma_map dma_map = { | |
606 | .argsz = sizeof(dma_map), | |
607 | .flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE, | |
608 | .iova = iova, | |
609 | .vaddr = (uintptr_t)host, | |
610 | .size = size, | |
611 | }; | |
612 | trace_qemu_vfio_do_mapping(s, host, size, iova); | |
613 | ||
614 | if (ioctl(s->container, VFIO_IOMMU_MAP_DMA, &dma_map)) { | |
b09d51c9 | 615 | error_report("VFIO_MAP_DMA failed: %s", strerror(errno)); |
418026ca FZ |
616 | return -errno; |
617 | } | |
618 | return 0; | |
619 | } | |
620 | ||
621 | /** | |
622 | * Undo the DMA mapping from @s with VFIO, and remove from mapping list. | |
623 | */ | |
624 | static void qemu_vfio_undo_mapping(QEMUVFIOState *s, IOVAMapping *mapping, | |
625 | Error **errp) | |
626 | { | |
627 | int index; | |
628 | struct vfio_iommu_type1_dma_unmap unmap = { | |
629 | .argsz = sizeof(unmap), | |
630 | .flags = 0, | |
631 | .iova = mapping->iova, | |
632 | .size = mapping->size, | |
633 | }; | |
634 | ||
635 | index = mapping - s->mappings; | |
636 | assert(mapping->size > 0); | |
038adc2f | 637 | assert(QEMU_IS_ALIGNED(mapping->size, qemu_real_host_page_size)); |
418026ca FZ |
638 | assert(index >= 0 && index < s->nr_mappings); |
639 | if (ioctl(s->container, VFIO_IOMMU_UNMAP_DMA, &unmap)) { | |
b09d51c9 | 640 | error_setg_errno(errp, errno, "VFIO_UNMAP_DMA failed"); |
418026ca FZ |
641 | } |
642 | memmove(mapping, &s->mappings[index + 1], | |
643 | sizeof(s->mappings[0]) * (s->nr_mappings - index - 1)); | |
644 | s->nr_mappings--; | |
d29eb678 | 645 | s->mappings = g_renew(IOVAMapping, s->mappings, s->nr_mappings); |
418026ca FZ |
646 | } |
647 | ||
648 | /* Check if the mapping list is (ascending) ordered. */ | |
649 | static bool qemu_vfio_verify_mappings(QEMUVFIOState *s) | |
650 | { | |
651 | int i; | |
652 | if (QEMU_VFIO_DEBUG) { | |
653 | for (i = 0; i < s->nr_mappings - 1; ++i) { | |
654 | if (!(s->mappings[i].host < s->mappings[i + 1].host)) { | |
655 | fprintf(stderr, "item %d not sorted!\n", i); | |
656 | qemu_vfio_dump_mappings(s); | |
657 | return false; | |
658 | } | |
659 | if (!(s->mappings[i].host + s->mappings[i].size <= | |
660 | s->mappings[i + 1].host)) { | |
661 | fprintf(stderr, "item %d overlap with next!\n", i); | |
662 | qemu_vfio_dump_mappings(s); | |
663 | return false; | |
664 | } | |
665 | } | |
666 | } | |
667 | return true; | |
668 | } | |
669 | ||
9ab57411 EA |
670 | static int |
671 | qemu_vfio_find_fixed_iova(QEMUVFIOState *s, size_t size, uint64_t *iova) | |
672 | { | |
673 | int i; | |
674 | ||
675 | for (i = 0; i < s->nb_iova_ranges; i++) { | |
676 | if (s->usable_iova_ranges[i].end < s->low_water_mark) { | |
677 | continue; | |
678 | } | |
679 | s->low_water_mark = | |
680 | MAX(s->low_water_mark, s->usable_iova_ranges[i].start); | |
681 | ||
682 | if (s->usable_iova_ranges[i].end - s->low_water_mark + 1 >= size || | |
683 | s->usable_iova_ranges[i].end - s->low_water_mark + 1 == 0) { | |
684 | *iova = s->low_water_mark; | |
685 | s->low_water_mark += size; | |
686 | return 0; | |
687 | } | |
688 | } | |
689 | return -ENOMEM; | |
690 | } | |
691 | ||
692 | static int | |
693 | qemu_vfio_find_temp_iova(QEMUVFIOState *s, size_t size, uint64_t *iova) | |
694 | { | |
695 | int i; | |
696 | ||
697 | for (i = s->nb_iova_ranges - 1; i >= 0; i--) { | |
698 | if (s->usable_iova_ranges[i].start > s->high_water_mark) { | |
699 | continue; | |
700 | } | |
701 | s->high_water_mark = | |
702 | MIN(s->high_water_mark, s->usable_iova_ranges[i].end + 1); | |
703 | ||
704 | if (s->high_water_mark - s->usable_iova_ranges[i].start + 1 >= size || | |
705 | s->high_water_mark - s->usable_iova_ranges[i].start + 1 == 0) { | |
706 | *iova = s->high_water_mark - size; | |
707 | s->high_water_mark = *iova; | |
708 | return 0; | |
709 | } | |
710 | } | |
711 | return -ENOMEM; | |
712 | } | |
713 | ||
418026ca FZ |
714 | /* Map [host, host + size) area into a contiguous IOVA address space, and store |
715 | * the result in @iova if not NULL. The caller need to make sure the area is | |
716 | * aligned to page size, and mustn't overlap with existing mapping areas (split | |
717 | * mapping status within this area is not allowed). | |
718 | */ | |
719 | int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, size_t size, | |
720 | bool temporary, uint64_t *iova) | |
721 | { | |
722 | int ret = 0; | |
723 | int index; | |
724 | IOVAMapping *mapping; | |
725 | uint64_t iova0; | |
726 | ||
038adc2f WY |
727 | assert(QEMU_PTR_IS_ALIGNED(host, qemu_real_host_page_size)); |
728 | assert(QEMU_IS_ALIGNED(size, qemu_real_host_page_size)); | |
418026ca FZ |
729 | trace_qemu_vfio_dma_map(s, host, size, temporary, iova); |
730 | qemu_mutex_lock(&s->lock); | |
731 | mapping = qemu_vfio_find_mapping(s, host, &index); | |
732 | if (mapping) { | |
733 | iova0 = mapping->iova + ((uint8_t *)host - (uint8_t *)mapping->host); | |
734 | } else { | |
735 | if (s->high_water_mark - s->low_water_mark + 1 < size) { | |
736 | ret = -ENOMEM; | |
737 | goto out; | |
738 | } | |
739 | if (!temporary) { | |
9ab57411 EA |
740 | if (qemu_vfio_find_fixed_iova(s, size, &iova0)) { |
741 | ret = -ENOMEM; | |
742 | goto out; | |
743 | } | |
744 | ||
418026ca FZ |
745 | mapping = qemu_vfio_add_mapping(s, host, size, index + 1, iova0); |
746 | if (!mapping) { | |
747 | ret = -ENOMEM; | |
748 | goto out; | |
749 | } | |
750 | assert(qemu_vfio_verify_mappings(s)); | |
751 | ret = qemu_vfio_do_mapping(s, host, size, iova0); | |
752 | if (ret) { | |
753 | qemu_vfio_undo_mapping(s, mapping, NULL); | |
754 | goto out; | |
755 | } | |
418026ca FZ |
756 | qemu_vfio_dump_mappings(s); |
757 | } else { | |
9ab57411 EA |
758 | if (qemu_vfio_find_temp_iova(s, size, &iova0)) { |
759 | ret = -ENOMEM; | |
760 | goto out; | |
761 | } | |
418026ca FZ |
762 | ret = qemu_vfio_do_mapping(s, host, size, iova0); |
763 | if (ret) { | |
764 | goto out; | |
765 | } | |
418026ca FZ |
766 | } |
767 | } | |
768 | if (iova) { | |
769 | *iova = iova0; | |
770 | } | |
771 | out: | |
772 | qemu_mutex_unlock(&s->lock); | |
773 | return ret; | |
774 | } | |
775 | ||
776 | /* Reset the high watermark and free all "temporary" mappings. */ | |
777 | int qemu_vfio_dma_reset_temporary(QEMUVFIOState *s) | |
778 | { | |
779 | struct vfio_iommu_type1_dma_unmap unmap = { | |
780 | .argsz = sizeof(unmap), | |
781 | .flags = 0, | |
782 | .iova = s->high_water_mark, | |
783 | .size = QEMU_VFIO_IOVA_MAX - s->high_water_mark, | |
784 | }; | |
785 | trace_qemu_vfio_dma_reset_temporary(s); | |
6e8a355d | 786 | QEMU_LOCK_GUARD(&s->lock); |
418026ca | 787 | if (ioctl(s->container, VFIO_IOMMU_UNMAP_DMA, &unmap)) { |
b09d51c9 | 788 | error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno)); |
418026ca FZ |
789 | return -errno; |
790 | } | |
791 | s->high_water_mark = QEMU_VFIO_IOVA_MAX; | |
418026ca FZ |
792 | return 0; |
793 | } | |
794 | ||
795 | /* Unmapping the whole area that was previously mapped with | |
796 | * qemu_vfio_dma_map(). */ | |
797 | void qemu_vfio_dma_unmap(QEMUVFIOState *s, void *host) | |
798 | { | |
799 | int index = 0; | |
800 | IOVAMapping *m; | |
801 | ||
802 | if (!host) { | |
803 | return; | |
804 | } | |
805 | ||
806 | trace_qemu_vfio_dma_unmap(s, host); | |
807 | qemu_mutex_lock(&s->lock); | |
808 | m = qemu_vfio_find_mapping(s, host, &index); | |
809 | if (!m) { | |
810 | goto out; | |
811 | } | |
812 | qemu_vfio_undo_mapping(s, m, NULL); | |
813 | out: | |
814 | qemu_mutex_unlock(&s->lock); | |
815 | } | |
816 | ||
817 | static void qemu_vfio_reset(QEMUVFIOState *s) | |
818 | { | |
819 | ioctl(s->device, VFIO_DEVICE_RESET); | |
820 | } | |
821 | ||
822 | /* Close and free the VFIO resources. */ | |
823 | void qemu_vfio_close(QEMUVFIOState *s) | |
824 | { | |
825 | int i; | |
826 | ||
827 | if (!s) { | |
828 | return; | |
829 | } | |
830 | for (i = 0; i < s->nr_mappings; ++i) { | |
831 | qemu_vfio_undo_mapping(s, &s->mappings[i], NULL); | |
832 | } | |
833 | ram_block_notifier_remove(&s->ram_notifier); | |
4487d420 EA |
834 | g_free(s->usable_iova_ranges); |
835 | s->nb_iova_ranges = 0; | |
418026ca FZ |
836 | qemu_vfio_reset(s); |
837 | close(s->device); | |
838 | close(s->group); | |
839 | close(s->container); | |
840 | } |