1 // SPDX-License-Identifier: GPL-2.0
2
3 #include "asm/hvcall.h"
4 #include <linux/log2.h>
5 #include <asm/pgalloc.h>
6 #include <asm/guest-state-buffer.h>
7
8 static const u16 kvmppc_gse_iden_len[__KVMPPC_GSE_TYPE_MAX] = {
9 [KVMPPC_GSE_BE32] = sizeof(__be32),
10 [KVMPPC_GSE_BE64] = sizeof(__be64),
11 [KVMPPC_GSE_VEC128] = sizeof(vector128),
12 [KVMPPC_GSE_PARTITION_TABLE] = sizeof(struct kvmppc_gs_part_table),
13 [KVMPPC_GSE_PROCESS_TABLE] = sizeof(struct kvmppc_gs_proc_table),
14 [KVMPPC_GSE_BUFFER] = sizeof(struct kvmppc_gs_buff_info),
15 };
16
17 /**
18 * kvmppc_gsb_new() - create a new guest state buffer
19 * @size: total size of the guest state buffer (includes header)
20 * @guest_id: guest_id
21 * @vcpu_id: vcpu_id
22 * @flags: GFP flags
23 *
24 * Returns a guest state buffer.
25 */
26 struct kvmppc_gs_buff *kvmppc_gsb_new(size_t size, unsigned long guest_id,
27 unsigned long vcpu_id, gfp_t flags)
28 {
29 struct kvmppc_gs_buff *gsb;
30
31 gsb = kzalloc(sizeof(*gsb), flags);
32 if (!gsb)
33 return NULL;
34
35 size = roundup_pow_of_two(size);
36 gsb->hdr = kzalloc(size, GFP_KERNEL);
37 if (!gsb->hdr)
38 goto free;
39
40 gsb->capacity = size;
41 gsb->len = sizeof(struct kvmppc_gs_header);
42 gsb->vcpu_id = vcpu_id;
43 gsb->guest_id = guest_id;
44
45 gsb->hdr->nelems = cpu_to_be32(0);
46
47 return gsb;
48
49 free:
50 kfree(gsb);
51 return NULL;
52 }
53 EXPORT_SYMBOL_GPL(kvmppc_gsb_new);
54
55 /**
56 * kvmppc_gsb_free() - free a guest state buffer
57 * @gsb: guest state buffer
58 */
59 void kvmppc_gsb_free(struct kvmppc_gs_buff *gsb)
60 {
61 kfree(gsb->hdr);
62 kfree(gsb);
63 }
64 EXPORT_SYMBOL_GPL(kvmppc_gsb_free);
65
66 /**
67 * kvmppc_gsb_put() - allocate space in a guest state buffer
68 * @gsb: buffer to allocate in
69 * @size: amount of space to allocate
70 *
71 * Returns a pointer to the amount of space requested within the buffer and
72 * increments the count of elements in the buffer.
73 *
74 * Does not check if there is enough space in the buffer.
75 */
76 void *kvmppc_gsb_put(struct kvmppc_gs_buff *gsb, size_t size)
77 {
78 u32 nelems = kvmppc_gsb_nelems(gsb);
79 void *p;
80
81 p = (void *)kvmppc_gsb_header(gsb) + kvmppc_gsb_len(gsb);
82 gsb->len += size;
83
84 kvmppc_gsb_header(gsb)->nelems = cpu_to_be32(nelems + 1);
85 return p;
86 }
87 EXPORT_SYMBOL_GPL(kvmppc_gsb_put);
88
89 static int kvmppc_gsid_class(u16 iden)
90 {
91 if ((iden >= KVMPPC_GSE_GUESTWIDE_START) &&
92 (iden <= KVMPPC_GSE_GUESTWIDE_END))
93 return KVMPPC_GS_CLASS_GUESTWIDE;
94
95 if ((iden >= KVMPPC_GSE_META_START) && (iden <= KVMPPC_GSE_META_END))
96 return KVMPPC_GS_CLASS_META;
97
98 if ((iden >= KVMPPC_GSE_DW_REGS_START) &&
99 (iden <= KVMPPC_GSE_DW_REGS_END))
100 return KVMPPC_GS_CLASS_DWORD_REG;
101
102 if ((iden >= KVMPPC_GSE_W_REGS_START) &&
103 (iden <= KVMPPC_GSE_W_REGS_END))
104 return KVMPPC_GS_CLASS_WORD_REG;
105
106 if ((iden >= KVMPPC_GSE_VSRS_START) && (iden <= KVMPPC_GSE_VSRS_END))
107 return KVMPPC_GS_CLASS_VECTOR;
108
109 if ((iden >= KVMPPC_GSE_INTR_REGS_START) &&
110 (iden <= KVMPPC_GSE_INTR_REGS_END))
111 return KVMPPC_GS_CLASS_INTR;
112
113 return -1;
114 }
115
116 static int kvmppc_gsid_type(u16 iden)
117 {
118 int type = -1;
119
120 switch (kvmppc_gsid_class(iden)) {
121 case KVMPPC_GS_CLASS_GUESTWIDE:
122 switch (iden) {
123 case KVMPPC_GSID_HOST_STATE_SIZE:
124 case KVMPPC_GSID_RUN_OUTPUT_MIN_SIZE:
125 case KVMPPC_GSID_TB_OFFSET:
126 type = KVMPPC_GSE_BE64;
127 break;
128 case KVMPPC_GSID_PARTITION_TABLE:
129 type = KVMPPC_GSE_PARTITION_TABLE;
130 break;
131 case KVMPPC_GSID_PROCESS_TABLE:
132 type = KVMPPC_GSE_PROCESS_TABLE;
133 break;
134 case KVMPPC_GSID_LOGICAL_PVR:
135 type = KVMPPC_GSE_BE32;
136 break;
137 }
138 break;
139 case KVMPPC_GS_CLASS_META:
140 switch (iden) {
141 case KVMPPC_GSID_RUN_INPUT:
142 case KVMPPC_GSID_RUN_OUTPUT:
143 type = KVMPPC_GSE_BUFFER;
144 break;
145 case KVMPPC_GSID_VPA:
146 type = KVMPPC_GSE_BE64;
147 break;
148 }
149 break;
150 case KVMPPC_GS_CLASS_DWORD_REG:
151 type = KVMPPC_GSE_BE64;
152 break;
153 case KVMPPC_GS_CLASS_WORD_REG:
154 type = KVMPPC_GSE_BE32;
155 break;
156 case KVMPPC_GS_CLASS_VECTOR:
157 type = KVMPPC_GSE_VEC128;
158 break;
159 case KVMPPC_GS_CLASS_INTR:
160 switch (iden) {
161 case KVMPPC_GSID_HDAR:
162 case KVMPPC_GSID_ASDR:
163 case KVMPPC_GSID_HEIR:
164 type = KVMPPC_GSE_BE64;
165 break;
166 case KVMPPC_GSID_HDSISR:
167 type = KVMPPC_GSE_BE32;
168 break;
169 }
170 break;
171 }
172
173 return type;
174 }
175
176 /**
177 * kvmppc_gsid_flags() - the flags for a guest state ID
178 * @iden: guest state ID
179 *
180 * Returns any flags for the guest state ID.
181 */
182 unsigned long kvmppc_gsid_flags(u16 iden)
183 {
184 unsigned long flags = 0;
185
186 switch (kvmppc_gsid_class(iden)) {
187 case KVMPPC_GS_CLASS_GUESTWIDE:
188 flags = KVMPPC_GS_FLAGS_WIDE;
189 break;
190 case KVMPPC_GS_CLASS_META:
191 case KVMPPC_GS_CLASS_DWORD_REG:
192 case KVMPPC_GS_CLASS_WORD_REG:
193 case KVMPPC_GS_CLASS_VECTOR:
194 case KVMPPC_GS_CLASS_INTR:
195 break;
196 }
197
198 return flags;
199 }
200 EXPORT_SYMBOL_GPL(kvmppc_gsid_flags);
201
202 /**
203 * kvmppc_gsid_size() - the size of a guest state ID
204 * @iden: guest state ID
205 *
206 * Returns the size of guest state ID.
207 */
208 u16 kvmppc_gsid_size(u16 iden)
209 {
210 int type;
211
212 type = kvmppc_gsid_type(iden);
213 if (type == -1)
214 return 0;
215
216 if (type >= __KVMPPC_GSE_TYPE_MAX)
217 return 0;
218
219 return kvmppc_gse_iden_len[type];
220 }
221 EXPORT_SYMBOL_GPL(kvmppc_gsid_size);
222
223 /**
224 * kvmppc_gsid_mask() - the settable bits of a guest state ID
225 * @iden: guest state ID
226 *
227 * Returns a mask of settable bits for a guest state ID.
228 */
229 u64 kvmppc_gsid_mask(u16 iden)
230 {
231 u64 mask = ~0ull;
232
233 switch (iden) {
234 case KVMPPC_GSID_LPCR:
235 mask = LPCR_DPFD | LPCR_ILE | LPCR_AIL | LPCR_LD | LPCR_MER |
236 LPCR_GTSE;
237 break;
238 case KVMPPC_GSID_MSR:
239 mask = ~(MSR_HV | MSR_S | MSR_ME);
240 break;
241 }
242
243 return mask;
244 }
245 EXPORT_SYMBOL_GPL(kvmppc_gsid_mask);
246
247 /**
248 * __kvmppc_gse_put() - add a guest state element to a buffer
249 * @gsb: buffer to the element to
250 * @iden: guest state ID
251 * @size: length of data
252 * @data: pointer to data
253 */
254 int __kvmppc_gse_put(struct kvmppc_gs_buff *gsb, u16 iden, u16 size,
255 const void *data)
256 {
257 struct kvmppc_gs_elem *gse;
258 u16 total_size;
259
260 total_size = sizeof(*gse) + size;
261 if (total_size + kvmppc_gsb_len(gsb) > kvmppc_gsb_capacity(gsb))
262 return -ENOMEM;
263
264 if (kvmppc_gsid_size(iden) != size)
265 return -EINVAL;
266
267 gse = kvmppc_gsb_put(gsb, total_size);
268 gse->iden = cpu_to_be16(iden);
269 gse->len = cpu_to_be16(size);
270 memcpy(gse->data, data, size);
271
272 return 0;
273 }
274 EXPORT_SYMBOL_GPL(__kvmppc_gse_put);
275
276 /**
277 * kvmppc_gse_parse() - create a parse map from a guest state buffer
278 * @gsp: guest state parser
279 * @gsb: guest state buffer
280 */
281 int kvmppc_gse_parse(struct kvmppc_gs_parser *gsp, struct kvmppc_gs_buff *gsb)
282 {
283 struct kvmppc_gs_elem *curr;
284 int rem, i;
285
286 kvmppc_gsb_for_each_elem(i, curr, gsb, rem) {
287 if (kvmppc_gse_len(curr) !=
288 kvmppc_gsid_size(kvmppc_gse_iden(curr)))
289 return -EINVAL;
290 kvmppc_gsp_insert(gsp, kvmppc_gse_iden(curr), curr);
291 }
292
293 if (kvmppc_gsb_nelems(gsb) != i)
294 return -EINVAL;
295 return 0;
296 }
297 EXPORT_SYMBOL_GPL(kvmppc_gse_parse);
298
299 static inline int kvmppc_gse_flatten_iden(u16 iden)
300 {
301 int bit = 0;
302 int class;
303
304 class = kvmppc_gsid_class(iden);
305
306 if (class == KVMPPC_GS_CLASS_GUESTWIDE) {
307 bit += iden - KVMPPC_GSE_GUESTWIDE_START;
308 return bit;
309 }
310
311 bit += KVMPPC_GSE_GUESTWIDE_COUNT;
312
313 if (class == KVMPPC_GS_CLASS_META) {
314 bit += iden - KVMPPC_GSE_META_START;
315 return bit;
316 }
317
318 bit += KVMPPC_GSE_META_COUNT;
319
320 if (class == KVMPPC_GS_CLASS_DWORD_REG) {
321 bit += iden - KVMPPC_GSE_DW_REGS_START;
322 return bit;
323 }
324
325 bit += KVMPPC_GSE_DW_REGS_COUNT;
326
327 if (class == KVMPPC_GS_CLASS_WORD_REG) {
328 bit += iden - KVMPPC_GSE_W_REGS_START;
329 return bit;
330 }
331
332 bit += KVMPPC_GSE_W_REGS_COUNT;
333
334 if (class == KVMPPC_GS_CLASS_VECTOR) {
335 bit += iden - KVMPPC_GSE_VSRS_START;
336 return bit;
337 }
338
339 bit += KVMPPC_GSE_VSRS_COUNT;
340
341 if (class == KVMPPC_GS_CLASS_INTR) {
342 bit += iden - KVMPPC_GSE_INTR_REGS_START;
343 return bit;
344 }
345
346 return 0;
347 }
348
349 static inline u16 kvmppc_gse_unflatten_iden(int bit)
350 {
351 u16 iden;
352
353 if (bit < KVMPPC_GSE_GUESTWIDE_COUNT) {
354 iden = KVMPPC_GSE_GUESTWIDE_START + bit;
355 return iden;
356 }
357 bit -= KVMPPC_GSE_GUESTWIDE_COUNT;
358
359 if (bit < KVMPPC_GSE_META_COUNT) {
360 iden = KVMPPC_GSE_META_START + bit;
361 return iden;
362 }
363 bit -= KVMPPC_GSE_META_COUNT;
364
365 if (bit < KVMPPC_GSE_DW_REGS_COUNT) {
366 iden = KVMPPC_GSE_DW_REGS_START + bit;
367 return iden;
368 }
369 bit -= KVMPPC_GSE_DW_REGS_COUNT;
370
371 if (bit < KVMPPC_GSE_W_REGS_COUNT) {
372 iden = KVMPPC_GSE_W_REGS_START + bit;
373 return iden;
374 }
375 bit -= KVMPPC_GSE_W_REGS_COUNT;
376
377 if (bit < KVMPPC_GSE_VSRS_COUNT) {
378 iden = KVMPPC_GSE_VSRS_START + bit;
379 return iden;
380 }
381 bit -= KVMPPC_GSE_VSRS_COUNT;
382
383 if (bit < KVMPPC_GSE_IDEN_COUNT) {
384 iden = KVMPPC_GSE_INTR_REGS_START + bit;
385 return iden;
386 }
387
388 return 0;
389 }
390
391 /**
392 * kvmppc_gsp_insert() - add a mapping from an guest state ID to an element
393 * @gsp: guest state parser
394 * @iden: guest state id (key)
395 * @gse: guest state element (value)
396 */
397 void kvmppc_gsp_insert(struct kvmppc_gs_parser *gsp, u16 iden,
398 struct kvmppc_gs_elem *gse)
399 {
400 int i;
401
402 i = kvmppc_gse_flatten_iden(iden);
403 kvmppc_gsbm_set(&gsp->iterator, iden);
404 gsp->gses[i] = gse;
405 }
406 EXPORT_SYMBOL_GPL(kvmppc_gsp_insert);
407
408 /**
409 * kvmppc_gsp_lookup() - lookup an element from a guest state ID
410 * @gsp: guest state parser
411 * @iden: guest state ID (key)
412 *
413 * Returns the guest state element if present.
414 */
415 struct kvmppc_gs_elem *kvmppc_gsp_lookup(struct kvmppc_gs_parser *gsp, u16 iden)
416 {
417 int i;
418
419 i = kvmppc_gse_flatten_iden(iden);
420 return gsp->gses[i];
421 }
422 EXPORT_SYMBOL_GPL(kvmppc_gsp_lookup);
423
424 /**
425 * kvmppc_gsbm_set() - set the guest state ID
426 * @gsbm: guest state bitmap
427 * @iden: guest state ID
428 */
429 void kvmppc_gsbm_set(struct kvmppc_gs_bitmap *gsbm, u16 iden)
430 {
431 set_bit(kvmppc_gse_flatten_iden(iden), gsbm->bitmap);
432 }
433 EXPORT_SYMBOL_GPL(kvmppc_gsbm_set);
434
435 /**
436 * kvmppc_gsbm_clear() - clear the guest state ID
437 * @gsbm: guest state bitmap
438 * @iden: guest state ID
439 */
440 void kvmppc_gsbm_clear(struct kvmppc_gs_bitmap *gsbm, u16 iden)
441 {
442 clear_bit(kvmppc_gse_flatten_iden(iden), gsbm->bitmap);
443 }
444 EXPORT_SYMBOL_GPL(kvmppc_gsbm_clear);
445
446 /**
447 * kvmppc_gsbm_test() - test the guest state ID
448 * @gsbm: guest state bitmap
449 * @iden: guest state ID
450 */
451 bool kvmppc_gsbm_test(struct kvmppc_gs_bitmap *gsbm, u16 iden)
452 {
453 return test_bit(kvmppc_gse_flatten_iden(iden), gsbm->bitmap);
454 }
455 EXPORT_SYMBOL_GPL(kvmppc_gsbm_test);
456
457 /**
458 * kvmppc_gsbm_next() - return the next set guest state ID
459 * @gsbm: guest state bitmap
460 * @prev: last guest state ID
461 */
462 u16 kvmppc_gsbm_next(struct kvmppc_gs_bitmap *gsbm, u16 prev)
463 {
464 int bit, pbit;
465
466 pbit = prev ? kvmppc_gse_flatten_iden(prev) + 1 : 0;
467 bit = find_next_bit(gsbm->bitmap, KVMPPC_GSE_IDEN_COUNT, pbit);
468
469 if (bit < KVMPPC_GSE_IDEN_COUNT)
470 return kvmppc_gse_unflatten_iden(bit);
471 return 0;
472 }
473 EXPORT_SYMBOL_GPL(kvmppc_gsbm_next);
474
475 /**
476 * kvmppc_gsm_init() - initialize a guest state message
477 * @gsm: guest state message
478 * @ops: callbacks
479 * @data: private data
480 * @flags: guest wide or thread wide
481 */
482 int kvmppc_gsm_init(struct kvmppc_gs_msg *gsm, struct kvmppc_gs_msg_ops *ops,
483 void *data, unsigned long flags)
484 {
485 memset(gsm, 0, sizeof(*gsm));
486 gsm->ops = ops;
487 gsm->data = data;
488 gsm->flags = flags;
489
490 return 0;
491 }
492 EXPORT_SYMBOL_GPL(kvmppc_gsm_init);
493
494 /**
495 * kvmppc_gsm_new() - creates a new guest state message
496 * @ops: callbacks
497 * @data: private data
498 * @flags: guest wide or thread wide
499 * @gfp_flags: GFP allocation flags
500 *
501 * Returns an initialized guest state message.
502 */
503 struct kvmppc_gs_msg *kvmppc_gsm_new(struct kvmppc_gs_msg_ops *ops, void *data,
504 unsigned long flags, gfp_t gfp_flags)
505 {
506 struct kvmppc_gs_msg *gsm;
507
508 gsm = kzalloc(sizeof(*gsm), gfp_flags);
509 if (!gsm)
510 return NULL;
511
512 kvmppc_gsm_init(gsm, ops, data, flags);
513
514 return gsm;
515 }
516 EXPORT_SYMBOL_GPL(kvmppc_gsm_new);
517
518 /**
519 * kvmppc_gsm_size() - creates a new guest state message
520 * @gsm: self
521 *
522 * Returns the size required for the message.
523 */
524 size_t kvmppc_gsm_size(struct kvmppc_gs_msg *gsm)
525 {
526 if (gsm->ops->get_size)
527 return gsm->ops->get_size(gsm);
528 return 0;
529 }
530 EXPORT_SYMBOL_GPL(kvmppc_gsm_size);
531
532 /**
533 * kvmppc_gsm_free() - free guest state message
534 * @gsm: guest state message
535 *
536 * Returns the size required for the message.
537 */
538 void kvmppc_gsm_free(struct kvmppc_gs_msg *gsm)
539 {
540 kfree(gsm);
541 }
542 EXPORT_SYMBOL_GPL(kvmppc_gsm_free);
543
544 /**
545 * kvmppc_gsm_fill_info() - serialises message to guest state buffer format
546 * @gsm: self
547 * @gsb: buffer to serialise into
548 */
549 int kvmppc_gsm_fill_info(struct kvmppc_gs_msg *gsm, struct kvmppc_gs_buff *gsb)
550 {
551 if (!gsm->ops->fill_info)
552 return -EINVAL;
553
554 return gsm->ops->fill_info(gsb, gsm);
555 }
556 EXPORT_SYMBOL_GPL(kvmppc_gsm_fill_info);
557
558 /**
559 * kvmppc_gsm_refresh_info() - deserialises from guest state buffer
560 * @gsm: self
561 * @gsb: buffer to serialise from
562 */
563 int kvmppc_gsm_refresh_info(struct kvmppc_gs_msg *gsm,
564 struct kvmppc_gs_buff *gsb)
565 {
566 if (!gsm->ops->fill_info)
567 return -EINVAL;
568
569 return gsm->ops->refresh_info(gsm, gsb);
570 }
571 EXPORT_SYMBOL_GPL(kvmppc_gsm_refresh_info);
572
573 /**
574 * kvmppc_gsb_send - send all elements in the buffer to the hypervisor.
575 * @gsb: guest state buffer
576 * @flags: guest wide or thread wide
577 *
578 * Performs the H_GUEST_SET_STATE hcall for the guest state buffer.
579 */
580 int kvmppc_gsb_send(struct kvmppc_gs_buff *gsb, unsigned long flags)
581 {
582 unsigned long hflags = 0;
583 unsigned long i;
584 int rc;
585
586 if (kvmppc_gsb_nelems(gsb) == 0)
587 return 0;
588
589 if (flags & KVMPPC_GS_FLAGS_WIDE)
590 hflags |= H_GUEST_FLAGS_WIDE;
591
592 rc = plpar_guest_set_state(hflags, gsb->guest_id, gsb->vcpu_id,
593 __pa(gsb->hdr), gsb->capacity, &i);
594 return rc;
595 }
596 EXPORT_SYMBOL_GPL(kvmppc_gsb_send);
597
598 /**
599 * kvmppc_gsb_recv - request all elements in the buffer have their value
600 * updated.
601 * @gsb: guest state buffer
602 * @flags: guest wide or thread wide
603 *
604 * Performs the H_GUEST_GET_STATE hcall for the guest state buffer.
605 * After returning from the hcall the guest state elements that were
606 * present in the buffer will have updated values from the hypervisor.
607 */
608 int kvmppc_gsb_recv(struct kvmppc_gs_buff *gsb, unsigned long flags)
609 {
610 unsigned long hflags = 0;
611 unsigned long i;
612 int rc;
613
614 if (flags & KVMPPC_GS_FLAGS_WIDE)
615 hflags |= H_GUEST_FLAGS_WIDE;
616
617 rc = plpar_guest_get_state(hflags, gsb->guest_id, gsb->vcpu_id,
618 __pa(gsb->hdr), gsb->capacity, &i);
619 return rc;
620 }
621 EXPORT_SYMBOL_GPL(kvmppc_gsb_recv);
622
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