1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2023, Microsoft Corporation.
4 *
5 * Hypercall helper functions used by the mshv_root module.
6 *
7 * Authors: Microsoft Linux virtualization team
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/mm.h>
12 #include <linux/export.h>
13 #include <asm/mshyperv.h>
14
15 #include "mshv_root.h"
16
17 /* Determined empirically */
18 #define HV_INIT_PARTITION_DEPOSIT_PAGES 208
19 #define HV_MAP_GPA_DEPOSIT_PAGES 256
20 #define HV_UMAP_GPA_PAGES 512
21
22 #define HV_PAGE_COUNT_2M_ALIGNED(pg_count) (!((pg_count) & (0x200 - 1)))
23
24 #define HV_WITHDRAW_BATCH_SIZE (HV_HYP_PAGE_SIZE / sizeof(u64))
25 #define HV_MAP_GPA_BATCH_SIZE \
26 ((HV_HYP_PAGE_SIZE - sizeof(struct hv_input_map_gpa_pages)) \
27 / sizeof(u64))
28 #define HV_GET_VP_STATE_BATCH_SIZE \
29 ((HV_HYP_PAGE_SIZE - sizeof(struct hv_input_get_vp_state)) \
30 / sizeof(u64))
31 #define HV_SET_VP_STATE_BATCH_SIZE \
32 ((HV_HYP_PAGE_SIZE - sizeof(struct hv_input_set_vp_state)) \
33 / sizeof(u64))
34 #define HV_GET_GPA_ACCESS_STATES_BATCH_SIZE \
35 ((HV_HYP_PAGE_SIZE - sizeof(union hv_gpa_page_access_state)) \
36 / sizeof(union hv_gpa_page_access_state))
37 #define HV_MODIFY_SPARSE_SPA_PAGE_HOST_ACCESS_MAX_PAGE_COUNT \
38 ((HV_HYP_PAGE_SIZE - \
39 sizeof(struct hv_input_modify_sparse_spa_page_host_access)) / \
40 sizeof(u64))
41
hv_call_withdraw_memory(u64 count,int node,u64 partition_id)42 int hv_call_withdraw_memory(u64 count, int node, u64 partition_id)
43 {
44 struct hv_input_withdraw_memory *input_page;
45 struct hv_output_withdraw_memory *output_page;
46 struct page *page;
47 u16 completed;
48 unsigned long remaining = count;
49 u64 status;
50 int i;
51 unsigned long flags;
52
53 page = alloc_page(GFP_KERNEL);
54 if (!page)
55 return -ENOMEM;
56 output_page = page_address(page);
57
58 while (remaining) {
59 local_irq_save(flags);
60
61 input_page = *this_cpu_ptr(hyperv_pcpu_input_arg);
62
63 memset(input_page, 0, sizeof(*input_page));
64 input_page->partition_id = partition_id;
65 status = hv_do_rep_hypercall(HVCALL_WITHDRAW_MEMORY,
66 min(remaining, HV_WITHDRAW_BATCH_SIZE),
67 0, input_page, output_page);
68
69 local_irq_restore(flags);
70
71 completed = hv_repcomp(status);
72
73 for (i = 0; i < completed; i++)
74 __free_page(pfn_to_page(output_page->gpa_page_list[i]));
75
76 if (!hv_result_success(status)) {
77 if (hv_result(status) == HV_STATUS_NO_RESOURCES)
78 status = HV_STATUS_SUCCESS;
79 break;
80 }
81
82 remaining -= completed;
83 }
84 free_page((unsigned long)output_page);
85
86 return hv_result_to_errno(status);
87 }
88
hv_call_create_partition(u64 flags,struct hv_partition_creation_properties creation_properties,union hv_partition_isolation_properties isolation_properties,u64 * partition_id)89 int hv_call_create_partition(u64 flags,
90 struct hv_partition_creation_properties creation_properties,
91 union hv_partition_isolation_properties isolation_properties,
92 u64 *partition_id)
93 {
94 struct hv_input_create_partition *input;
95 struct hv_output_create_partition *output;
96 u64 status;
97 int ret;
98 unsigned long irq_flags;
99
100 do {
101 local_irq_save(irq_flags);
102 input = *this_cpu_ptr(hyperv_pcpu_input_arg);
103 output = *this_cpu_ptr(hyperv_pcpu_output_arg);
104
105 memset(input, 0, sizeof(*input));
106 input->flags = flags;
107 input->compatibility_version = HV_COMPATIBILITY_21_H2;
108
109 memcpy(&input->partition_creation_properties, &creation_properties,
110 sizeof(creation_properties));
111
112 memcpy(&input->isolation_properties, &isolation_properties,
113 sizeof(isolation_properties));
114
115 status = hv_do_hypercall(HVCALL_CREATE_PARTITION,
116 input, output);
117
118 if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
119 if (hv_result_success(status))
120 *partition_id = output->partition_id;
121 local_irq_restore(irq_flags);
122 ret = hv_result_to_errno(status);
123 break;
124 }
125 local_irq_restore(irq_flags);
126 ret = hv_call_deposit_pages(NUMA_NO_NODE,
127 hv_current_partition_id, 1);
128 } while (!ret);
129
130 return ret;
131 }
132
hv_call_initialize_partition(u64 partition_id)133 int hv_call_initialize_partition(u64 partition_id)
134 {
135 struct hv_input_initialize_partition input;
136 u64 status;
137 int ret;
138
139 input.partition_id = partition_id;
140
141 ret = hv_call_deposit_pages(NUMA_NO_NODE, partition_id,
142 HV_INIT_PARTITION_DEPOSIT_PAGES);
143 if (ret)
144 return ret;
145
146 do {
147 status = hv_do_fast_hypercall8(HVCALL_INITIALIZE_PARTITION,
148 *(u64 *)&input);
149
150 if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
151 ret = hv_result_to_errno(status);
152 break;
153 }
154 ret = hv_call_deposit_pages(NUMA_NO_NODE, partition_id, 1);
155 } while (!ret);
156
157 return ret;
158 }
159
hv_call_finalize_partition(u64 partition_id)160 int hv_call_finalize_partition(u64 partition_id)
161 {
162 struct hv_input_finalize_partition input;
163 u64 status;
164
165 input.partition_id = partition_id;
166 status = hv_do_fast_hypercall8(HVCALL_FINALIZE_PARTITION,
167 *(u64 *)&input);
168
169 return hv_result_to_errno(status);
170 }
171
hv_call_delete_partition(u64 partition_id)172 int hv_call_delete_partition(u64 partition_id)
173 {
174 struct hv_input_delete_partition input;
175 u64 status;
176
177 input.partition_id = partition_id;
178 status = hv_do_fast_hypercall8(HVCALL_DELETE_PARTITION, *(u64 *)&input);
179
180 return hv_result_to_errno(status);
181 }
182
183 /* Ask the hypervisor to map guest ram pages or the guest mmio space */
hv_do_map_gpa_hcall(u64 partition_id,u64 gfn,u64 page_struct_count,u32 flags,struct page ** pages,u64 mmio_spa)184 static int hv_do_map_gpa_hcall(u64 partition_id, u64 gfn, u64 page_struct_count,
185 u32 flags, struct page **pages, u64 mmio_spa)
186 {
187 struct hv_input_map_gpa_pages *input_page;
188 u64 status, *pfnlist;
189 unsigned long irq_flags, large_shift = 0;
190 int ret = 0, done = 0;
191 u64 page_count = page_struct_count;
192
193 if (page_count == 0 || (pages && mmio_spa))
194 return -EINVAL;
195
196 if (flags & HV_MAP_GPA_LARGE_PAGE) {
197 if (mmio_spa)
198 return -EINVAL;
199
200 if (!HV_PAGE_COUNT_2M_ALIGNED(page_count))
201 return -EINVAL;
202
203 large_shift = HV_HYP_LARGE_PAGE_SHIFT - HV_HYP_PAGE_SHIFT;
204 page_count >>= large_shift;
205 }
206
207 while (done < page_count) {
208 ulong i, completed, remain = page_count - done;
209 int rep_count = min(remain, HV_MAP_GPA_BATCH_SIZE);
210
211 local_irq_save(irq_flags);
212 input_page = *this_cpu_ptr(hyperv_pcpu_input_arg);
213
214 input_page->target_partition_id = partition_id;
215 input_page->target_gpa_base = gfn + (done << large_shift);
216 input_page->map_flags = flags;
217 pfnlist = input_page->source_gpa_page_list;
218
219 for (i = 0; i < rep_count; i++)
220 if (flags & HV_MAP_GPA_NO_ACCESS) {
221 pfnlist[i] = 0;
222 } else if (pages) {
223 u64 index = (done + i) << large_shift;
224
225 if (index >= page_struct_count) {
226 ret = -EINVAL;
227 break;
228 }
229 pfnlist[i] = page_to_pfn(pages[index]);
230 } else {
231 pfnlist[i] = mmio_spa + done + i;
232 }
233 if (ret)
234 break;
235
236 status = hv_do_rep_hypercall(HVCALL_MAP_GPA_PAGES, rep_count, 0,
237 input_page, NULL);
238 local_irq_restore(irq_flags);
239
240 completed = hv_repcomp(status);
241
242 if (hv_result(status) == HV_STATUS_INSUFFICIENT_MEMORY) {
243 ret = hv_call_deposit_pages(NUMA_NO_NODE, partition_id,
244 HV_MAP_GPA_DEPOSIT_PAGES);
245 if (ret)
246 break;
247
248 } else if (!hv_result_success(status)) {
249 ret = hv_result_to_errno(status);
250 break;
251 }
252
253 done += completed;
254 }
255
256 if (ret && done) {
257 u32 unmap_flags = 0;
258
259 if (flags & HV_MAP_GPA_LARGE_PAGE)
260 unmap_flags |= HV_UNMAP_GPA_LARGE_PAGE;
261 hv_call_unmap_gpa_pages(partition_id, gfn, done, unmap_flags);
262 }
263
264 return ret;
265 }
266
267 /* Ask the hypervisor to map guest ram pages */
hv_call_map_gpa_pages(u64 partition_id,u64 gpa_target,u64 page_count,u32 flags,struct page ** pages)268 int hv_call_map_gpa_pages(u64 partition_id, u64 gpa_target, u64 page_count,
269 u32 flags, struct page **pages)
270 {
271 return hv_do_map_gpa_hcall(partition_id, gpa_target, page_count,
272 flags, pages, 0);
273 }
274
275 /* Ask the hypervisor to map guest mmio space */
hv_call_map_mmio_pages(u64 partition_id,u64 gfn,u64 mmio_spa,u64 numpgs)276 int hv_call_map_mmio_pages(u64 partition_id, u64 gfn, u64 mmio_spa, u64 numpgs)
277 {
278 int i;
279 u32 flags = HV_MAP_GPA_READABLE | HV_MAP_GPA_WRITABLE |
280 HV_MAP_GPA_NOT_CACHED;
281
282 for (i = 0; i < numpgs; i++)
283 if (page_is_ram(mmio_spa + i))
284 return -EINVAL;
285
286 return hv_do_map_gpa_hcall(partition_id, gfn, numpgs, flags, NULL,
287 mmio_spa);
288 }
289
hv_call_unmap_gpa_pages(u64 partition_id,u64 gfn,u64 page_count_4k,u32 flags)290 int hv_call_unmap_gpa_pages(u64 partition_id, u64 gfn, u64 page_count_4k,
291 u32 flags)
292 {
293 struct hv_input_unmap_gpa_pages *input_page;
294 u64 status, page_count = page_count_4k;
295 unsigned long irq_flags, large_shift = 0;
296 int ret = 0, done = 0;
297
298 if (page_count == 0)
299 return -EINVAL;
300
301 if (flags & HV_UNMAP_GPA_LARGE_PAGE) {
302 if (!HV_PAGE_COUNT_2M_ALIGNED(page_count))
303 return -EINVAL;
304
305 large_shift = HV_HYP_LARGE_PAGE_SHIFT - HV_HYP_PAGE_SHIFT;
306 page_count >>= large_shift;
307 }
308
309 while (done < page_count) {
310 ulong completed, remain = page_count - done;
311 int rep_count = min(remain, HV_UMAP_GPA_PAGES);
312
313 local_irq_save(irq_flags);
314 input_page = *this_cpu_ptr(hyperv_pcpu_input_arg);
315
316 input_page->target_partition_id = partition_id;
317 input_page->target_gpa_base = gfn + (done << large_shift);
318 input_page->unmap_flags = flags;
319 status = hv_do_rep_hypercall(HVCALL_UNMAP_GPA_PAGES, rep_count,
320 0, input_page, NULL);
321 local_irq_restore(irq_flags);
322
323 completed = hv_repcomp(status);
324 if (!hv_result_success(status)) {
325 ret = hv_result_to_errno(status);
326 break;
327 }
328
329 done += completed;
330 }
331
332 return ret;
333 }
334
hv_call_get_gpa_access_states(u64 partition_id,u32 count,u64 gpa_base_pfn,union hv_gpa_page_access_state_flags state_flags,int * written_total,union hv_gpa_page_access_state * states)335 int hv_call_get_gpa_access_states(u64 partition_id, u32 count, u64 gpa_base_pfn,
336 union hv_gpa_page_access_state_flags state_flags,
337 int *written_total,
338 union hv_gpa_page_access_state *states)
339 {
340 struct hv_input_get_gpa_pages_access_state *input_page;
341 union hv_gpa_page_access_state *output_page;
342 int completed = 0;
343 unsigned long remaining = count;
344 int rep_count, i;
345 u64 status = 0;
346 unsigned long flags;
347
348 *written_total = 0;
349 while (remaining) {
350 local_irq_save(flags);
351 input_page = *this_cpu_ptr(hyperv_pcpu_input_arg);
352 output_page = *this_cpu_ptr(hyperv_pcpu_output_arg);
353
354 input_page->partition_id = partition_id;
355 input_page->hv_gpa_page_number = gpa_base_pfn + *written_total;
356 input_page->flags = state_flags;
357 rep_count = min(remaining, HV_GET_GPA_ACCESS_STATES_BATCH_SIZE);
358
359 status = hv_do_rep_hypercall(HVCALL_GET_GPA_PAGES_ACCESS_STATES, rep_count,
360 0, input_page, output_page);
361 if (!hv_result_success(status)) {
362 local_irq_restore(flags);
363 break;
364 }
365 completed = hv_repcomp(status);
366 for (i = 0; i < completed; ++i)
367 states[i].as_uint8 = output_page[i].as_uint8;
368
369 local_irq_restore(flags);
370 states += completed;
371 *written_total += completed;
372 remaining -= completed;
373 }
374
375 return hv_result_to_errno(status);
376 }
377
hv_call_assert_virtual_interrupt(u64 partition_id,u32 vector,u64 dest_addr,union hv_interrupt_control control)378 int hv_call_assert_virtual_interrupt(u64 partition_id, u32 vector,
379 u64 dest_addr,
380 union hv_interrupt_control control)
381 {
382 struct hv_input_assert_virtual_interrupt *input;
383 unsigned long flags;
384 u64 status;
385
386 local_irq_save(flags);
387 input = *this_cpu_ptr(hyperv_pcpu_input_arg);
388 memset(input, 0, sizeof(*input));
389 input->partition_id = partition_id;
390 input->vector = vector;
391 input->dest_addr = dest_addr;
392 input->control = control;
393 status = hv_do_hypercall(HVCALL_ASSERT_VIRTUAL_INTERRUPT, input, NULL);
394 local_irq_restore(flags);
395
396 return hv_result_to_errno(status);
397 }
398
hv_call_delete_vp(u64 partition_id,u32 vp_index)399 int hv_call_delete_vp(u64 partition_id, u32 vp_index)
400 {
401 union hv_input_delete_vp input = {};
402 u64 status;
403
404 input.partition_id = partition_id;
405 input.vp_index = vp_index;
406
407 status = hv_do_fast_hypercall16(HVCALL_DELETE_VP,
408 input.as_uint64[0], input.as_uint64[1]);
409
410 return hv_result_to_errno(status);
411 }
412 EXPORT_SYMBOL_GPL(hv_call_delete_vp);
413
hv_call_get_vp_state(u32 vp_index,u64 partition_id,struct hv_vp_state_data state_data,u64 page_count,struct page ** pages,union hv_output_get_vp_state * ret_output)414 int hv_call_get_vp_state(u32 vp_index, u64 partition_id,
415 struct hv_vp_state_data state_data,
416 /* Choose between pages and ret_output */
417 u64 page_count, struct page **pages,
418 union hv_output_get_vp_state *ret_output)
419 {
420 struct hv_input_get_vp_state *input;
421 union hv_output_get_vp_state *output;
422 u64 status;
423 int i;
424 u64 control;
425 unsigned long flags;
426 int ret = 0;
427
428 if (page_count > HV_GET_VP_STATE_BATCH_SIZE)
429 return -EINVAL;
430
431 if (!page_count && !ret_output)
432 return -EINVAL;
433
434 do {
435 local_irq_save(flags);
436 input = *this_cpu_ptr(hyperv_pcpu_input_arg);
437 output = *this_cpu_ptr(hyperv_pcpu_output_arg);
438 memset(input, 0, sizeof(*input));
439 memset(output, 0, sizeof(*output));
440
441 input->partition_id = partition_id;
442 input->vp_index = vp_index;
443 input->state_data = state_data;
444 for (i = 0; i < page_count; i++)
445 input->output_data_pfns[i] = page_to_pfn(pages[i]);
446
447 control = (HVCALL_GET_VP_STATE) |
448 (page_count << HV_HYPERCALL_VARHEAD_OFFSET);
449
450 status = hv_do_hypercall(control, input, output);
451
452 if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
453 if (hv_result_success(status) && ret_output)
454 memcpy(ret_output, output, sizeof(*output));
455
456 local_irq_restore(flags);
457 ret = hv_result_to_errno(status);
458 break;
459 }
460 local_irq_restore(flags);
461
462 ret = hv_call_deposit_pages(NUMA_NO_NODE,
463 partition_id, 1);
464 } while (!ret);
465
466 return ret;
467 }
468
hv_call_set_vp_state(u32 vp_index,u64 partition_id,struct hv_vp_state_data state_data,u64 page_count,struct page ** pages,u32 num_bytes,u8 * bytes)469 int hv_call_set_vp_state(u32 vp_index, u64 partition_id,
470 /* Choose between pages and bytes */
471 struct hv_vp_state_data state_data, u64 page_count,
472 struct page **pages, u32 num_bytes, u8 *bytes)
473 {
474 struct hv_input_set_vp_state *input;
475 u64 status;
476 int i;
477 u64 control;
478 unsigned long flags;
479 int ret = 0;
480 u16 varhead_sz;
481
482 if (page_count > HV_SET_VP_STATE_BATCH_SIZE)
483 return -EINVAL;
484 if (sizeof(*input) + num_bytes > HV_HYP_PAGE_SIZE)
485 return -EINVAL;
486
487 if (num_bytes)
488 /* round up to 8 and divide by 8 */
489 varhead_sz = (num_bytes + 7) >> 3;
490 else if (page_count)
491 varhead_sz = page_count;
492 else
493 return -EINVAL;
494
495 do {
496 local_irq_save(flags);
497 input = *this_cpu_ptr(hyperv_pcpu_input_arg);
498 memset(input, 0, sizeof(*input));
499
500 input->partition_id = partition_id;
501 input->vp_index = vp_index;
502 input->state_data = state_data;
503 if (num_bytes) {
504 memcpy((u8 *)input->data, bytes, num_bytes);
505 } else {
506 for (i = 0; i < page_count; i++)
507 input->data[i].pfns = page_to_pfn(pages[i]);
508 }
509
510 control = (HVCALL_SET_VP_STATE) |
511 (varhead_sz << HV_HYPERCALL_VARHEAD_OFFSET);
512
513 status = hv_do_hypercall(control, input, NULL);
514
515 if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
516 local_irq_restore(flags);
517 ret = hv_result_to_errno(status);
518 break;
519 }
520 local_irq_restore(flags);
521
522 ret = hv_call_deposit_pages(NUMA_NO_NODE,
523 partition_id, 1);
524 } while (!ret);
525
526 return ret;
527 }
528
hv_call_map_vp_state_page(u64 partition_id,u32 vp_index,u32 type,union hv_input_vtl input_vtl,struct page ** state_page)529 int hv_call_map_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
530 union hv_input_vtl input_vtl,
531 struct page **state_page)
532 {
533 struct hv_input_map_vp_state_page *input;
534 struct hv_output_map_vp_state_page *output;
535 u64 status;
536 int ret;
537 unsigned long flags;
538
539 do {
540 local_irq_save(flags);
541
542 input = *this_cpu_ptr(hyperv_pcpu_input_arg);
543 output = *this_cpu_ptr(hyperv_pcpu_output_arg);
544
545 input->partition_id = partition_id;
546 input->vp_index = vp_index;
547 input->type = type;
548 input->input_vtl = input_vtl;
549
550 status = hv_do_hypercall(HVCALL_MAP_VP_STATE_PAGE, input, output);
551
552 if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
553 if (hv_result_success(status))
554 *state_page = pfn_to_page(output->map_location);
555 local_irq_restore(flags);
556 ret = hv_result_to_errno(status);
557 break;
558 }
559
560 local_irq_restore(flags);
561
562 ret = hv_call_deposit_pages(NUMA_NO_NODE, partition_id, 1);
563 } while (!ret);
564
565 return ret;
566 }
567
hv_call_unmap_vp_state_page(u64 partition_id,u32 vp_index,u32 type,union hv_input_vtl input_vtl)568 int hv_call_unmap_vp_state_page(u64 partition_id, u32 vp_index, u32 type,
569 union hv_input_vtl input_vtl)
570 {
571 unsigned long flags;
572 u64 status;
573 struct hv_input_unmap_vp_state_page *input;
574
575 local_irq_save(flags);
576
577 input = *this_cpu_ptr(hyperv_pcpu_input_arg);
578
579 memset(input, 0, sizeof(*input));
580
581 input->partition_id = partition_id;
582 input->vp_index = vp_index;
583 input->type = type;
584 input->input_vtl = input_vtl;
585
586 status = hv_do_hypercall(HVCALL_UNMAP_VP_STATE_PAGE, input, NULL);
587
588 local_irq_restore(flags);
589
590 return hv_result_to_errno(status);
591 }
592
593 int
hv_call_clear_virtual_interrupt(u64 partition_id)594 hv_call_clear_virtual_interrupt(u64 partition_id)
595 {
596 int status;
597
598 status = hv_do_fast_hypercall8(HVCALL_CLEAR_VIRTUAL_INTERRUPT,
599 partition_id);
600
601 return hv_result_to_errno(status);
602 }
603
604 int
hv_call_create_port(u64 port_partition_id,union hv_port_id port_id,u64 connection_partition_id,struct hv_port_info * port_info,u8 port_vtl,u8 min_connection_vtl,int node)605 hv_call_create_port(u64 port_partition_id, union hv_port_id port_id,
606 u64 connection_partition_id,
607 struct hv_port_info *port_info,
608 u8 port_vtl, u8 min_connection_vtl, int node)
609 {
610 struct hv_input_create_port *input;
611 unsigned long flags;
612 int ret = 0;
613 int status;
614
615 do {
616 local_irq_save(flags);
617 input = *this_cpu_ptr(hyperv_pcpu_input_arg);
618 memset(input, 0, sizeof(*input));
619
620 input->port_partition_id = port_partition_id;
621 input->port_id = port_id;
622 input->connection_partition_id = connection_partition_id;
623 input->port_info = *port_info;
624 input->port_vtl = port_vtl;
625 input->min_connection_vtl = min_connection_vtl;
626 input->proximity_domain_info = hv_numa_node_to_pxm_info(node);
627 status = hv_do_hypercall(HVCALL_CREATE_PORT, input, NULL);
628 local_irq_restore(flags);
629 if (hv_result_success(status))
630 break;
631
632 if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
633 ret = hv_result_to_errno(status);
634 break;
635 }
636 ret = hv_call_deposit_pages(NUMA_NO_NODE, port_partition_id, 1);
637
638 } while (!ret);
639
640 return ret;
641 }
642
643 int
hv_call_delete_port(u64 port_partition_id,union hv_port_id port_id)644 hv_call_delete_port(u64 port_partition_id, union hv_port_id port_id)
645 {
646 union hv_input_delete_port input = { 0 };
647 int status;
648
649 input.port_partition_id = port_partition_id;
650 input.port_id = port_id;
651 status = hv_do_fast_hypercall16(HVCALL_DELETE_PORT,
652 input.as_uint64[0],
653 input.as_uint64[1]);
654
655 return hv_result_to_errno(status);
656 }
657
658 int
hv_call_connect_port(u64 port_partition_id,union hv_port_id port_id,u64 connection_partition_id,union hv_connection_id connection_id,struct hv_connection_info * connection_info,u8 connection_vtl,int node)659 hv_call_connect_port(u64 port_partition_id, union hv_port_id port_id,
660 u64 connection_partition_id,
661 union hv_connection_id connection_id,
662 struct hv_connection_info *connection_info,
663 u8 connection_vtl, int node)
664 {
665 struct hv_input_connect_port *input;
666 unsigned long flags;
667 int ret = 0, status;
668
669 do {
670 local_irq_save(flags);
671 input = *this_cpu_ptr(hyperv_pcpu_input_arg);
672 memset(input, 0, sizeof(*input));
673 input->port_partition_id = port_partition_id;
674 input->port_id = port_id;
675 input->connection_partition_id = connection_partition_id;
676 input->connection_id = connection_id;
677 input->connection_info = *connection_info;
678 input->connection_vtl = connection_vtl;
679 input->proximity_domain_info = hv_numa_node_to_pxm_info(node);
680 status = hv_do_hypercall(HVCALL_CONNECT_PORT, input, NULL);
681
682 local_irq_restore(flags);
683 if (hv_result_success(status))
684 break;
685
686 if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
687 ret = hv_result_to_errno(status);
688 break;
689 }
690 ret = hv_call_deposit_pages(NUMA_NO_NODE,
691 connection_partition_id, 1);
692 } while (!ret);
693
694 return ret;
695 }
696
697 int
hv_call_disconnect_port(u64 connection_partition_id,union hv_connection_id connection_id)698 hv_call_disconnect_port(u64 connection_partition_id,
699 union hv_connection_id connection_id)
700 {
701 union hv_input_disconnect_port input = { 0 };
702 int status;
703
704 input.connection_partition_id = connection_partition_id;
705 input.connection_id = connection_id;
706 input.is_doorbell = 1;
707 status = hv_do_fast_hypercall16(HVCALL_DISCONNECT_PORT,
708 input.as_uint64[0],
709 input.as_uint64[1]);
710
711 return hv_result_to_errno(status);
712 }
713
714 int
hv_call_notify_port_ring_empty(u32 sint_index)715 hv_call_notify_port_ring_empty(u32 sint_index)
716 {
717 union hv_input_notify_port_ring_empty input = { 0 };
718 int status;
719
720 input.sint_index = sint_index;
721 status = hv_do_fast_hypercall8(HVCALL_NOTIFY_PORT_RING_EMPTY,
722 input.as_uint64);
723
724 return hv_result_to_errno(status);
725 }
726
hv_call_map_stat_page(enum hv_stats_object_type type,const union hv_stats_object_identity * identity,void ** addr)727 int hv_call_map_stat_page(enum hv_stats_object_type type,
728 const union hv_stats_object_identity *identity,
729 void **addr)
730 {
731 unsigned long flags;
732 struct hv_input_map_stats_page *input;
733 struct hv_output_map_stats_page *output;
734 u64 status, pfn;
735 int ret = 0;
736
737 do {
738 local_irq_save(flags);
739 input = *this_cpu_ptr(hyperv_pcpu_input_arg);
740 output = *this_cpu_ptr(hyperv_pcpu_output_arg);
741
742 memset(input, 0, sizeof(*input));
743 input->type = type;
744 input->identity = *identity;
745
746 status = hv_do_hypercall(HVCALL_MAP_STATS_PAGE, input, output);
747 pfn = output->map_location;
748
749 local_irq_restore(flags);
750 if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
751 ret = hv_result_to_errno(status);
752 if (hv_result_success(status))
753 break;
754 return ret;
755 }
756
757 ret = hv_call_deposit_pages(NUMA_NO_NODE,
758 hv_current_partition_id, 1);
759 if (ret)
760 return ret;
761 } while (!ret);
762
763 *addr = page_address(pfn_to_page(pfn));
764
765 return ret;
766 }
767
hv_call_unmap_stat_page(enum hv_stats_object_type type,const union hv_stats_object_identity * identity)768 int hv_call_unmap_stat_page(enum hv_stats_object_type type,
769 const union hv_stats_object_identity *identity)
770 {
771 unsigned long flags;
772 struct hv_input_unmap_stats_page *input;
773 u64 status;
774
775 local_irq_save(flags);
776 input = *this_cpu_ptr(hyperv_pcpu_input_arg);
777
778 memset(input, 0, sizeof(*input));
779 input->type = type;
780 input->identity = *identity;
781
782 status = hv_do_hypercall(HVCALL_UNMAP_STATS_PAGE, input, NULL);
783 local_irq_restore(flags);
784
785 return hv_result_to_errno(status);
786 }
787
hv_call_modify_spa_host_access(u64 partition_id,struct page ** pages,u64 page_struct_count,u32 host_access,u32 flags,u8 acquire)788 int hv_call_modify_spa_host_access(u64 partition_id, struct page **pages,
789 u64 page_struct_count, u32 host_access,
790 u32 flags, u8 acquire)
791 {
792 struct hv_input_modify_sparse_spa_page_host_access *input_page;
793 u64 status;
794 int done = 0;
795 unsigned long irq_flags, large_shift = 0;
796 u64 page_count = page_struct_count;
797 u16 code = acquire ? HVCALL_ACQUIRE_SPARSE_SPA_PAGE_HOST_ACCESS :
798 HVCALL_RELEASE_SPARSE_SPA_PAGE_HOST_ACCESS;
799
800 if (page_count == 0)
801 return -EINVAL;
802
803 if (flags & HV_MODIFY_SPA_PAGE_HOST_ACCESS_LARGE_PAGE) {
804 if (!HV_PAGE_COUNT_2M_ALIGNED(page_count))
805 return -EINVAL;
806 large_shift = HV_HYP_LARGE_PAGE_SHIFT - HV_HYP_PAGE_SHIFT;
807 page_count >>= large_shift;
808 }
809
810 while (done < page_count) {
811 ulong i, completed, remain = page_count - done;
812 int rep_count = min(remain,
813 HV_MODIFY_SPARSE_SPA_PAGE_HOST_ACCESS_MAX_PAGE_COUNT);
814
815 local_irq_save(irq_flags);
816 input_page = *this_cpu_ptr(hyperv_pcpu_input_arg);
817
818 memset(input_page, 0, sizeof(*input_page));
819 /* Only set the partition id if you are making the pages
820 * exclusive
821 */
822 if (flags & HV_MODIFY_SPA_PAGE_HOST_ACCESS_MAKE_EXCLUSIVE)
823 input_page->partition_id = partition_id;
824 input_page->flags = flags;
825 input_page->host_access = host_access;
826
827 for (i = 0; i < rep_count; i++) {
828 u64 index = (done + i) << large_shift;
829
830 if (index >= page_struct_count)
831 return -EINVAL;
832
833 input_page->spa_page_list[i] =
834 page_to_pfn(pages[index]);
835 }
836
837 status = hv_do_rep_hypercall(code, rep_count, 0, input_page,
838 NULL);
839 local_irq_restore(irq_flags);
840
841 completed = hv_repcomp(status);
842
843 if (!hv_result_success(status))
844 return hv_result_to_errno(status);
845
846 done += completed;
847 }
848
849 return 0;
850 }
851