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1/*
2 * GTT virtualization
3 *
4 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Authors:
26 * Zhi Wang <zhi.a.wang@intel.com>
27 * Zhenyu Wang <zhenyuw@linux.intel.com>
28 * Xiao Zheng <xiao.zheng@intel.com>
29 *
30 * Contributors:
31 * Min He <min.he@intel.com>
32 * Bing Niu <bing.niu@intel.com>
33 *
34 */
35
36#include "i915_drv.h"
37#include "gvt.h"
38#include "i915_pvinfo.h"
39#include "trace.h"
40
41static bool enable_out_of_sync = false;
42static int preallocated_oos_pages = 8192;
43
44/*
45 * validate a gm address and related range size,
46 * translate it to host gm address
47 */
48bool intel_gvt_ggtt_validate_range(struct intel_vgpu *vgpu, u64 addr, u32 size)
49{
50 if ((!vgpu_gmadr_is_valid(vgpu, addr)) || (size
51 && !vgpu_gmadr_is_valid(vgpu, addr + size - 1))) {
52 gvt_err("vgpu%d: invalid range gmadr 0x%llx size 0x%x\n",
53 vgpu->id, addr, size);
54 return false;
55 }
56 return true;
57}
58
59/* translate a guest gmadr to host gmadr */
60int intel_gvt_ggtt_gmadr_g2h(struct intel_vgpu *vgpu, u64 g_addr, u64 *h_addr)
61{
62 if (WARN(!vgpu_gmadr_is_valid(vgpu, g_addr),
63 "invalid guest gmadr %llx\n", g_addr))
64 return -EACCES;
65
66 if (vgpu_gmadr_is_aperture(vgpu, g_addr))
67 *h_addr = vgpu_aperture_gmadr_base(vgpu)
68 + (g_addr - vgpu_aperture_offset(vgpu));
69 else
70 *h_addr = vgpu_hidden_gmadr_base(vgpu)
71 + (g_addr - vgpu_hidden_offset(vgpu));
72 return 0;
73}
74
75/* translate a host gmadr to guest gmadr */
76int intel_gvt_ggtt_gmadr_h2g(struct intel_vgpu *vgpu, u64 h_addr, u64 *g_addr)
77{
78 if (WARN(!gvt_gmadr_is_valid(vgpu->gvt, h_addr),
79 "invalid host gmadr %llx\n", h_addr))
80 return -EACCES;
81
82 if (gvt_gmadr_is_aperture(vgpu->gvt, h_addr))
83 *g_addr = vgpu_aperture_gmadr_base(vgpu)
84 + (h_addr - gvt_aperture_gmadr_base(vgpu->gvt));
85 else
86 *g_addr = vgpu_hidden_gmadr_base(vgpu)
87 + (h_addr - gvt_hidden_gmadr_base(vgpu->gvt));
88 return 0;
89}
90
91int intel_gvt_ggtt_index_g2h(struct intel_vgpu *vgpu, unsigned long g_index,
92 unsigned long *h_index)
93{
94 u64 h_addr;
95 int ret;
96
97 ret = intel_gvt_ggtt_gmadr_g2h(vgpu, g_index << GTT_PAGE_SHIFT,
98 &h_addr);
99 if (ret)
100 return ret;
101
102 *h_index = h_addr >> GTT_PAGE_SHIFT;
103 return 0;
104}
105
106int intel_gvt_ggtt_h2g_index(struct intel_vgpu *vgpu, unsigned long h_index,
107 unsigned long *g_index)
108{
109 u64 g_addr;
110 int ret;
111
112 ret = intel_gvt_ggtt_gmadr_h2g(vgpu, h_index << GTT_PAGE_SHIFT,
113 &g_addr);
114 if (ret)
115 return ret;
116
117 *g_index = g_addr >> GTT_PAGE_SHIFT;
118 return 0;
119}
120
121#define gtt_type_is_entry(type) \
122 (type > GTT_TYPE_INVALID && type < GTT_TYPE_PPGTT_ENTRY \
123 && type != GTT_TYPE_PPGTT_PTE_ENTRY \
124 && type != GTT_TYPE_PPGTT_ROOT_ENTRY)
125
126#define gtt_type_is_pt(type) \
127 (type >= GTT_TYPE_PPGTT_PTE_PT && type < GTT_TYPE_MAX)
128
129#define gtt_type_is_pte_pt(type) \
130 (type == GTT_TYPE_PPGTT_PTE_PT)
131
132#define gtt_type_is_root_pointer(type) \
133 (gtt_type_is_entry(type) && type > GTT_TYPE_PPGTT_ROOT_ENTRY)
134
135#define gtt_init_entry(e, t, p, v) do { \
136 (e)->type = t; \
137 (e)->pdev = p; \
138 memcpy(&(e)->val64, &v, sizeof(v)); \
139} while (0)
140
141/*
142 * Mappings between GTT_TYPE* enumerations.
143 * Following information can be found according to the given type:
144 * - type of next level page table
145 * - type of entry inside this level page table
146 * - type of entry with PSE set
147 *
148 * If the given type doesn't have such a kind of information,
149 * e.g. give a l4 root entry type, then request to get its PSE type,
150 * give a PTE page table type, then request to get its next level page
151 * table type, as we know l4 root entry doesn't have a PSE bit,
152 * and a PTE page table doesn't have a next level page table type,
153 * GTT_TYPE_INVALID will be returned. This is useful when traversing a
154 * page table.
155 */
156
157struct gtt_type_table_entry {
158 int entry_type;
159 int next_pt_type;
160 int pse_entry_type;
161};
162
163#define GTT_TYPE_TABLE_ENTRY(type, e_type, npt_type, pse_type) \
164 [type] = { \
165 .entry_type = e_type, \
166 .next_pt_type = npt_type, \
167 .pse_entry_type = pse_type, \
168 }
169
170static struct gtt_type_table_entry gtt_type_table[] = {
171 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_ROOT_L4_ENTRY,
172 GTT_TYPE_PPGTT_ROOT_L4_ENTRY,
173 GTT_TYPE_PPGTT_PML4_PT,
174 GTT_TYPE_INVALID),
175 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PML4_PT,
176 GTT_TYPE_PPGTT_PML4_ENTRY,
177 GTT_TYPE_PPGTT_PDP_PT,
178 GTT_TYPE_INVALID),
179 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PML4_ENTRY,
180 GTT_TYPE_PPGTT_PML4_ENTRY,
181 GTT_TYPE_PPGTT_PDP_PT,
182 GTT_TYPE_INVALID),
183 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PDP_PT,
184 GTT_TYPE_PPGTT_PDP_ENTRY,
185 GTT_TYPE_PPGTT_PDE_PT,
186 GTT_TYPE_PPGTT_PTE_1G_ENTRY),
187 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_ROOT_L3_ENTRY,
188 GTT_TYPE_PPGTT_ROOT_L3_ENTRY,
189 GTT_TYPE_PPGTT_PDE_PT,
190 GTT_TYPE_PPGTT_PTE_1G_ENTRY),
191 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PDP_ENTRY,
192 GTT_TYPE_PPGTT_PDP_ENTRY,
193 GTT_TYPE_PPGTT_PDE_PT,
194 GTT_TYPE_PPGTT_PTE_1G_ENTRY),
195 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PDE_PT,
196 GTT_TYPE_PPGTT_PDE_ENTRY,
197 GTT_TYPE_PPGTT_PTE_PT,
198 GTT_TYPE_PPGTT_PTE_2M_ENTRY),
199 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PDE_ENTRY,
200 GTT_TYPE_PPGTT_PDE_ENTRY,
201 GTT_TYPE_PPGTT_PTE_PT,
202 GTT_TYPE_PPGTT_PTE_2M_ENTRY),
203 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_PT,
204 GTT_TYPE_PPGTT_PTE_4K_ENTRY,
205 GTT_TYPE_INVALID,
206 GTT_TYPE_INVALID),
207 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_4K_ENTRY,
208 GTT_TYPE_PPGTT_PTE_4K_ENTRY,
209 GTT_TYPE_INVALID,
210 GTT_TYPE_INVALID),
211 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_2M_ENTRY,
212 GTT_TYPE_PPGTT_PDE_ENTRY,
213 GTT_TYPE_INVALID,
214 GTT_TYPE_PPGTT_PTE_2M_ENTRY),
215 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_1G_ENTRY,
216 GTT_TYPE_PPGTT_PDP_ENTRY,
217 GTT_TYPE_INVALID,
218 GTT_TYPE_PPGTT_PTE_1G_ENTRY),
219 GTT_TYPE_TABLE_ENTRY(GTT_TYPE_GGTT_PTE,
220 GTT_TYPE_GGTT_PTE,
221 GTT_TYPE_INVALID,
222 GTT_TYPE_INVALID),
223};
224
225static inline int get_next_pt_type(int type)
226{
227 return gtt_type_table[type].next_pt_type;
228}
229
230static inline int get_entry_type(int type)
231{
232 return gtt_type_table[type].entry_type;
233}
234
235static inline int get_pse_type(int type)
236{
237 return gtt_type_table[type].pse_entry_type;
238}
239
240static u64 read_pte64(struct drm_i915_private *dev_priv, unsigned long index)
241{
242 void __iomem *addr = (gen8_pte_t __iomem *)dev_priv->ggtt.gsm + index;
243
244 return readq(addr);
245}
246
247static void write_pte64(struct drm_i915_private *dev_priv,
248 unsigned long index, u64 pte)
249{
250 void __iomem *addr = (gen8_pte_t __iomem *)dev_priv->ggtt.gsm + index;
251
252 writeq(pte, addr);
253
254 I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
255 POSTING_READ(GFX_FLSH_CNTL_GEN6);
256}
257
258static inline struct intel_gvt_gtt_entry *gtt_get_entry64(void *pt,
259 struct intel_gvt_gtt_entry *e,
260 unsigned long index, bool hypervisor_access, unsigned long gpa,
261 struct intel_vgpu *vgpu)
262{
263 const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
264 int ret;
265
266 if (WARN_ON(info->gtt_entry_size != 8))
267 return e;
268
269 if (hypervisor_access) {
270 ret = intel_gvt_hypervisor_read_gpa(vgpu, gpa +
271 (index << info->gtt_entry_size_shift),
272 &e->val64, 8);
273 WARN_ON(ret);
274 } else if (!pt) {
275 e->val64 = read_pte64(vgpu->gvt->dev_priv, index);
276 } else {
277 e->val64 = *((u64 *)pt + index);
278 }
279 return e;
280}
281
282static inline struct intel_gvt_gtt_entry *gtt_set_entry64(void *pt,
283 struct intel_gvt_gtt_entry *e,
284 unsigned long index, bool hypervisor_access, unsigned long gpa,
285 struct intel_vgpu *vgpu)
286{
287 const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
288 int ret;
289
290 if (WARN_ON(info->gtt_entry_size != 8))
291 return e;
292
293 if (hypervisor_access) {
294 ret = intel_gvt_hypervisor_write_gpa(vgpu, gpa +
295 (index << info->gtt_entry_size_shift),
296 &e->val64, 8);
297 WARN_ON(ret);
298 } else if (!pt) {
299 write_pte64(vgpu->gvt->dev_priv, index, e->val64);
300 } else {
301 *((u64 *)pt + index) = e->val64;
302 }
303 return e;
304}
305
306#define GTT_HAW 46
307
308#define ADDR_1G_MASK (((1UL << (GTT_HAW - 30 + 1)) - 1) << 30)
309#define ADDR_2M_MASK (((1UL << (GTT_HAW - 21 + 1)) - 1) << 21)
310#define ADDR_4K_MASK (((1UL << (GTT_HAW - 12 + 1)) - 1) << 12)
311
312static unsigned long gen8_gtt_get_pfn(struct intel_gvt_gtt_entry *e)
313{
314 unsigned long pfn;
315
316 if (e->type == GTT_TYPE_PPGTT_PTE_1G_ENTRY)
317 pfn = (e->val64 & ADDR_1G_MASK) >> 12;
318 else if (e->type == GTT_TYPE_PPGTT_PTE_2M_ENTRY)
319 pfn = (e->val64 & ADDR_2M_MASK) >> 12;
320 else
321 pfn = (e->val64 & ADDR_4K_MASK) >> 12;
322 return pfn;
323}
324
325static void gen8_gtt_set_pfn(struct intel_gvt_gtt_entry *e, unsigned long pfn)
326{
327 if (e->type == GTT_TYPE_PPGTT_PTE_1G_ENTRY) {
328 e->val64 &= ~ADDR_1G_MASK;
329 pfn &= (ADDR_1G_MASK >> 12);
330 } else if (e->type == GTT_TYPE_PPGTT_PTE_2M_ENTRY) {
331 e->val64 &= ~ADDR_2M_MASK;
332 pfn &= (ADDR_2M_MASK >> 12);
333 } else {
334 e->val64 &= ~ADDR_4K_MASK;
335 pfn &= (ADDR_4K_MASK >> 12);
336 }
337
338 e->val64 |= (pfn << 12);
339}
340
341static bool gen8_gtt_test_pse(struct intel_gvt_gtt_entry *e)
342{
343 /* Entry doesn't have PSE bit. */
344 if (get_pse_type(e->type) == GTT_TYPE_INVALID)
345 return false;
346
347 e->type = get_entry_type(e->type);
348 if (!(e->val64 & (1 << 7)))
349 return false;
350
351 e->type = get_pse_type(e->type);
352 return true;
353}
354
355static bool gen8_gtt_test_present(struct intel_gvt_gtt_entry *e)
356{
357 /*
358 * i915 writes PDP root pointer registers without present bit,
359 * it also works, so we need to treat root pointer entry
360 * specifically.
361 */
362 if (e->type == GTT_TYPE_PPGTT_ROOT_L3_ENTRY
363 || e->type == GTT_TYPE_PPGTT_ROOT_L4_ENTRY)
364 return (e->val64 != 0);
365 else
366 return (e->val64 & (1 << 0));
367}
368
369static void gtt_entry_clear_present(struct intel_gvt_gtt_entry *e)
370{
371 e->val64 &= ~(1 << 0);
372}
373
374/*
375 * Per-platform GMA routines.
376 */
377static unsigned long gma_to_ggtt_pte_index(unsigned long gma)
378{
379 unsigned long x = (gma >> GTT_PAGE_SHIFT);
380
381 trace_gma_index(__func__, gma, x);
382 return x;
383}
384
385#define DEFINE_PPGTT_GMA_TO_INDEX(prefix, ename, exp) \
386static unsigned long prefix##_gma_to_##ename##_index(unsigned long gma) \
387{ \
388 unsigned long x = (exp); \
389 trace_gma_index(__func__, gma, x); \
390 return x; \
391}
392
393DEFINE_PPGTT_GMA_TO_INDEX(gen8, pte, (gma >> 12 & 0x1ff));
394DEFINE_PPGTT_GMA_TO_INDEX(gen8, pde, (gma >> 21 & 0x1ff));
395DEFINE_PPGTT_GMA_TO_INDEX(gen8, l3_pdp, (gma >> 30 & 0x3));
396DEFINE_PPGTT_GMA_TO_INDEX(gen8, l4_pdp, (gma >> 30 & 0x1ff));
397DEFINE_PPGTT_GMA_TO_INDEX(gen8, pml4, (gma >> 39 & 0x1ff));
398
399static struct intel_gvt_gtt_pte_ops gen8_gtt_pte_ops = {
400 .get_entry = gtt_get_entry64,
401 .set_entry = gtt_set_entry64,
402 .clear_present = gtt_entry_clear_present,
403 .test_present = gen8_gtt_test_present,
404 .test_pse = gen8_gtt_test_pse,
405 .get_pfn = gen8_gtt_get_pfn,
406 .set_pfn = gen8_gtt_set_pfn,
407};
408
409static struct intel_gvt_gtt_gma_ops gen8_gtt_gma_ops = {
410 .gma_to_ggtt_pte_index = gma_to_ggtt_pte_index,
411 .gma_to_pte_index = gen8_gma_to_pte_index,
412 .gma_to_pde_index = gen8_gma_to_pde_index,
413 .gma_to_l3_pdp_index = gen8_gma_to_l3_pdp_index,
414 .gma_to_l4_pdp_index = gen8_gma_to_l4_pdp_index,
415 .gma_to_pml4_index = gen8_gma_to_pml4_index,
416};
417
418static int gtt_entry_p2m(struct intel_vgpu *vgpu, struct intel_gvt_gtt_entry *p,
419 struct intel_gvt_gtt_entry *m)
420{
421 struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
422 unsigned long gfn, mfn;
423
424 *m = *p;
425
426 if (!ops->test_present(p))
427 return 0;
428
429 gfn = ops->get_pfn(p);
430
431 mfn = intel_gvt_hypervisor_gfn_to_mfn(vgpu, gfn);
432 if (mfn == INTEL_GVT_INVALID_ADDR) {
433 gvt_err("fail to translate gfn: 0x%lx\n", gfn);
434 return -ENXIO;
435 }
436
437 ops->set_pfn(m, mfn);
438 return 0;
439}
440
441/*
442 * MM helpers.
443 */
444struct intel_gvt_gtt_entry *intel_vgpu_mm_get_entry(struct intel_vgpu_mm *mm,
445 void *page_table, struct intel_gvt_gtt_entry *e,
446 unsigned long index)
447{
448 struct intel_gvt *gvt = mm->vgpu->gvt;
449 struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
450
451 e->type = mm->page_table_entry_type;
452
453 ops->get_entry(page_table, e, index, false, 0, mm->vgpu);
454 ops->test_pse(e);
455 return e;
456}
457
458struct intel_gvt_gtt_entry *intel_vgpu_mm_set_entry(struct intel_vgpu_mm *mm,
459 void *page_table, struct intel_gvt_gtt_entry *e,
460 unsigned long index)
461{
462 struct intel_gvt *gvt = mm->vgpu->gvt;
463 struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
464
465 return ops->set_entry(page_table, e, index, false, 0, mm->vgpu);
466}
467
468/*
469 * PPGTT shadow page table helpers.
470 */
471static inline struct intel_gvt_gtt_entry *ppgtt_spt_get_entry(
472 struct intel_vgpu_ppgtt_spt *spt,
473 void *page_table, int type,
474 struct intel_gvt_gtt_entry *e, unsigned long index,
475 bool guest)
476{
477 struct intel_gvt *gvt = spt->vgpu->gvt;
478 struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
479
480 e->type = get_entry_type(type);
481
482 if (WARN(!gtt_type_is_entry(e->type), "invalid entry type\n"))
483 return e;
484
485 ops->get_entry(page_table, e, index, guest,
486 spt->guest_page.gfn << GTT_PAGE_SHIFT,
487 spt->vgpu);
488 ops->test_pse(e);
489 return e;
490}
491
492static inline struct intel_gvt_gtt_entry *ppgtt_spt_set_entry(
493 struct intel_vgpu_ppgtt_spt *spt,
494 void *page_table, int type,
495 struct intel_gvt_gtt_entry *e, unsigned long index,
496 bool guest)
497{
498 struct intel_gvt *gvt = spt->vgpu->gvt;
499 struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
500
501 if (WARN(!gtt_type_is_entry(e->type), "invalid entry type\n"))
502 return e;
503
504 return ops->set_entry(page_table, e, index, guest,
505 spt->guest_page.gfn << GTT_PAGE_SHIFT,
506 spt->vgpu);
507}
508
509#define ppgtt_get_guest_entry(spt, e, index) \
510 ppgtt_spt_get_entry(spt, NULL, \
511 spt->guest_page_type, e, index, true)
512
513#define ppgtt_set_guest_entry(spt, e, index) \
514 ppgtt_spt_set_entry(spt, NULL, \
515 spt->guest_page_type, e, index, true)
516
517#define ppgtt_get_shadow_entry(spt, e, index) \
518 ppgtt_spt_get_entry(spt, spt->shadow_page.vaddr, \
519 spt->shadow_page.type, e, index, false)
520
521#define ppgtt_set_shadow_entry(spt, e, index) \
522 ppgtt_spt_set_entry(spt, spt->shadow_page.vaddr, \
523 spt->shadow_page.type, e, index, false)
524
525/**
526 * intel_vgpu_init_guest_page - init a guest page data structure
527 * @vgpu: a vGPU
528 * @p: a guest page data structure
529 * @gfn: guest memory page frame number
530 * @handler: function will be called when target guest memory page has
531 * been modified.
532 *
533 * This function is called when user wants to track a guest memory page.
534 *
535 * Returns:
536 * Zero on success, negative error code if failed.
537 */
538int intel_vgpu_init_guest_page(struct intel_vgpu *vgpu,
539 struct intel_vgpu_guest_page *p,
540 unsigned long gfn,
541 int (*handler)(void *, u64, void *, int),
542 void *data)
543{
544 INIT_HLIST_NODE(&p->node);
545
546 p->writeprotection = false;
547 p->gfn = gfn;
548 p->handler = handler;
549 p->data = data;
550 p->oos_page = NULL;
551 p->write_cnt = 0;
552
553 hash_add(vgpu->gtt.guest_page_hash_table, &p->node, p->gfn);
554 return 0;
555}
556
557static int detach_oos_page(struct intel_vgpu *vgpu,
558 struct intel_vgpu_oos_page *oos_page);
559
560/**
561 * intel_vgpu_clean_guest_page - release the resource owned by guest page data
562 * structure
563 * @vgpu: a vGPU
564 * @p: a tracked guest page
565 *
566 * This function is called when user tries to stop tracking a guest memory
567 * page.
568 */
569void intel_vgpu_clean_guest_page(struct intel_vgpu *vgpu,
570 struct intel_vgpu_guest_page *p)
571{
572 if (!hlist_unhashed(&p->node))
573 hash_del(&p->node);
574
575 if (p->oos_page)
576 detach_oos_page(vgpu, p->oos_page);
577
578 if (p->writeprotection)
579 intel_gvt_hypervisor_unset_wp_page(vgpu, p);
580}
581
582/**
583 * intel_vgpu_find_guest_page - find a guest page data structure by GFN.
584 * @vgpu: a vGPU
585 * @gfn: guest memory page frame number
586 *
587 * This function is called when emulation logic wants to know if a trapped GFN
588 * is a tracked guest page.
589 *
590 * Returns:
591 * Pointer to guest page data structure, NULL if failed.
592 */
593struct intel_vgpu_guest_page *intel_vgpu_find_guest_page(
594 struct intel_vgpu *vgpu, unsigned long gfn)
595{
596 struct intel_vgpu_guest_page *p;
597
598 hash_for_each_possible(vgpu->gtt.guest_page_hash_table,
599 p, node, gfn) {
600 if (p->gfn == gfn)
601 return p;
602 }
603 return NULL;
604}
605
606static inline int init_shadow_page(struct intel_vgpu *vgpu,
607 struct intel_vgpu_shadow_page *p, int type)
608{
609 p->vaddr = page_address(p->page);
610 p->type = type;
611
612 INIT_HLIST_NODE(&p->node);
613
614 p->mfn = intel_gvt_hypervisor_virt_to_mfn(p->vaddr);
615 if (p->mfn == INTEL_GVT_INVALID_ADDR)
616 return -EFAULT;
617
618 hash_add(vgpu->gtt.shadow_page_hash_table, &p->node, p->mfn);
619 return 0;
620}
621
622static inline void clean_shadow_page(struct intel_vgpu_shadow_page *p)
623{
624 if (!hlist_unhashed(&p->node))
625 hash_del(&p->node);
626}
627
628static inline struct intel_vgpu_shadow_page *find_shadow_page(
629 struct intel_vgpu *vgpu, unsigned long mfn)
630{
631 struct intel_vgpu_shadow_page *p;
632
633 hash_for_each_possible(vgpu->gtt.shadow_page_hash_table,
634 p, node, mfn) {
635 if (p->mfn == mfn)
636 return p;
637 }
638 return NULL;
639}
640
641#define guest_page_to_ppgtt_spt(ptr) \
642 container_of(ptr, struct intel_vgpu_ppgtt_spt, guest_page)
643
644#define shadow_page_to_ppgtt_spt(ptr) \
645 container_of(ptr, struct intel_vgpu_ppgtt_spt, shadow_page)
646
647static void *alloc_spt(gfp_t gfp_mask)
648{
649 struct intel_vgpu_ppgtt_spt *spt;
650
651 spt = kzalloc(sizeof(*spt), gfp_mask);
652 if (!spt)
653 return NULL;
654
655 spt->shadow_page.page = alloc_page(gfp_mask);
656 if (!spt->shadow_page.page) {
657 kfree(spt);
658 return NULL;
659 }
660 return spt;
661}
662
663static void free_spt(struct intel_vgpu_ppgtt_spt *spt)
664{
665 __free_page(spt->shadow_page.page);
666 kfree(spt);
667}
668
669static void ppgtt_free_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
670{
671 trace_spt_free(spt->vgpu->id, spt, spt->shadow_page.type);
672
673 clean_shadow_page(&spt->shadow_page);
674 intel_vgpu_clean_guest_page(spt->vgpu, &spt->guest_page);
675 list_del_init(&spt->post_shadow_list);
676
677 free_spt(spt);
678}
679
680static void ppgtt_free_all_shadow_page(struct intel_vgpu *vgpu)
681{
682 struct hlist_node *n;
683 struct intel_vgpu_shadow_page *sp;
684 int i;
685
686 hash_for_each_safe(vgpu->gtt.shadow_page_hash_table, i, n, sp, node)
687 ppgtt_free_shadow_page(shadow_page_to_ppgtt_spt(sp));
688}
689
690static int ppgtt_handle_guest_write_page_table_bytes(void *gp,
691 u64 pa, void *p_data, int bytes);
692
693static int ppgtt_write_protection_handler(void *gp, u64 pa,
694 void *p_data, int bytes)
695{
696 struct intel_vgpu_guest_page *gpt = (struct intel_vgpu_guest_page *)gp;
697 int ret;
698
699 if (bytes != 4 && bytes != 8)
700 return -EINVAL;
701
702 if (!gpt->writeprotection)
703 return -EINVAL;
704
705 ret = ppgtt_handle_guest_write_page_table_bytes(gp,
706 pa, p_data, bytes);
707 if (ret)
708 return ret;
709 return ret;
710}
711
712static int reclaim_one_mm(struct intel_gvt *gvt);
713
714static struct intel_vgpu_ppgtt_spt *ppgtt_alloc_shadow_page(
715 struct intel_vgpu *vgpu, int type, unsigned long gfn)
716{
717 struct intel_vgpu_ppgtt_spt *spt = NULL;
718 int ret;
719
720retry:
721 spt = alloc_spt(GFP_KERNEL | __GFP_ZERO);
722 if (!spt) {
723 if (reclaim_one_mm(vgpu->gvt))
724 goto retry;
725
726 gvt_err("fail to allocate ppgtt shadow page\n");
727 return ERR_PTR(-ENOMEM);
728 }
729
730 spt->vgpu = vgpu;
731 spt->guest_page_type = type;
732 atomic_set(&spt->refcount, 1);
733 INIT_LIST_HEAD(&spt->post_shadow_list);
734
735 /*
736 * TODO: guest page type may be different with shadow page type,
737 * when we support PSE page in future.
738 */
739 ret = init_shadow_page(vgpu, &spt->shadow_page, type);
740 if (ret) {
741 gvt_err("fail to initialize shadow page for spt\n");
742 goto err;
743 }
744
745 ret = intel_vgpu_init_guest_page(vgpu, &spt->guest_page,
746 gfn, ppgtt_write_protection_handler, NULL);
747 if (ret) {
748 gvt_err("fail to initialize guest page for spt\n");
749 goto err;
750 }
751
752 trace_spt_alloc(vgpu->id, spt, type, spt->shadow_page.mfn, gfn);
753 return spt;
754err:
755 ppgtt_free_shadow_page(spt);
756 return ERR_PTR(ret);
757}
758
759static struct intel_vgpu_ppgtt_spt *ppgtt_find_shadow_page(
760 struct intel_vgpu *vgpu, unsigned long mfn)
761{
762 struct intel_vgpu_shadow_page *p = find_shadow_page(vgpu, mfn);
763
764 if (p)
765 return shadow_page_to_ppgtt_spt(p);
766
767 gvt_err("vgpu%d: fail to find ppgtt shadow page: 0x%lx\n",
768 vgpu->id, mfn);
769 return NULL;
770}
771
772#define pt_entry_size_shift(spt) \
773 ((spt)->vgpu->gvt->device_info.gtt_entry_size_shift)
774
775#define pt_entries(spt) \
776 (GTT_PAGE_SIZE >> pt_entry_size_shift(spt))
777
778#define for_each_present_guest_entry(spt, e, i) \
779 for (i = 0; i < pt_entries(spt); i++) \
780 if (spt->vgpu->gvt->gtt.pte_ops->test_present( \
781 ppgtt_get_guest_entry(spt, e, i)))
782
783#define for_each_present_shadow_entry(spt, e, i) \
784 for (i = 0; i < pt_entries(spt); i++) \
785 if (spt->vgpu->gvt->gtt.pte_ops->test_present( \
786 ppgtt_get_shadow_entry(spt, e, i)))
787
788static void ppgtt_get_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
789{
790 int v = atomic_read(&spt->refcount);
791
792 trace_spt_refcount(spt->vgpu->id, "inc", spt, v, (v + 1));
793
794 atomic_inc(&spt->refcount);
795}
796
797static int ppgtt_invalidate_shadow_page(struct intel_vgpu_ppgtt_spt *spt);
798
799static int ppgtt_invalidate_shadow_page_by_shadow_entry(struct intel_vgpu *vgpu,
800 struct intel_gvt_gtt_entry *e)
801{
802 struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
803 struct intel_vgpu_ppgtt_spt *s;
804 intel_gvt_gtt_type_t cur_pt_type;
805
806 if (WARN_ON(!gtt_type_is_pt(get_next_pt_type(e->type))))
807 return -EINVAL;
808
809 if (e->type != GTT_TYPE_PPGTT_ROOT_L3_ENTRY
810 && e->type != GTT_TYPE_PPGTT_ROOT_L4_ENTRY) {
811 cur_pt_type = get_next_pt_type(e->type) + 1;
812 if (ops->get_pfn(e) ==
813 vgpu->gtt.scratch_pt[cur_pt_type].page_mfn)
814 return 0;
815 }
816 s = ppgtt_find_shadow_page(vgpu, ops->get_pfn(e));
817 if (!s) {
818 gvt_err("vgpu%d: fail to find shadow page: mfn: 0x%lx\n",
819 vgpu->id, ops->get_pfn(e));
820 return -ENXIO;
821 }
822 return ppgtt_invalidate_shadow_page(s);
823}
824
825static int ppgtt_invalidate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
826{
827 struct intel_gvt_gtt_entry e;
828 unsigned long index;
829 int ret;
830 int v = atomic_read(&spt->refcount);
831
832 trace_spt_change(spt->vgpu->id, "die", spt,
833 spt->guest_page.gfn, spt->shadow_page.type);
834
835 trace_spt_refcount(spt->vgpu->id, "dec", spt, v, (v - 1));
836
837 if (atomic_dec_return(&spt->refcount) > 0)
838 return 0;
839
840 if (gtt_type_is_pte_pt(spt->shadow_page.type))
841 goto release;
842
843 for_each_present_shadow_entry(spt, &e, index) {
844 if (!gtt_type_is_pt(get_next_pt_type(e.type))) {
845 gvt_err("GVT doesn't support pse bit for now\n");
846 return -EINVAL;
847 }
848 ret = ppgtt_invalidate_shadow_page_by_shadow_entry(
849 spt->vgpu, &e);
850 if (ret)
851 goto fail;
852 }
853release:
854 trace_spt_change(spt->vgpu->id, "release", spt,
855 spt->guest_page.gfn, spt->shadow_page.type);
856 ppgtt_free_shadow_page(spt);
857 return 0;
858fail:
859 gvt_err("vgpu%d: fail: shadow page %p shadow entry 0x%llx type %d\n",
860 spt->vgpu->id, spt, e.val64, e.type);
861 return ret;
862}
863
864static int ppgtt_populate_shadow_page(struct intel_vgpu_ppgtt_spt *spt);
865
866static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry(
867 struct intel_vgpu *vgpu, struct intel_gvt_gtt_entry *we)
868{
869 struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
870 struct intel_vgpu_ppgtt_spt *s = NULL;
871 struct intel_vgpu_guest_page *g;
872 int ret;
873
874 if (WARN_ON(!gtt_type_is_pt(get_next_pt_type(we->type)))) {
875 ret = -EINVAL;
876 goto fail;
877 }
878
879 g = intel_vgpu_find_guest_page(vgpu, ops->get_pfn(we));
880 if (g) {
881 s = guest_page_to_ppgtt_spt(g);
882 ppgtt_get_shadow_page(s);
883 } else {
884 int type = get_next_pt_type(we->type);
885
886 s = ppgtt_alloc_shadow_page(vgpu, type, ops->get_pfn(we));
887 if (IS_ERR(s)) {
888 ret = PTR_ERR(s);
889 goto fail;
890 }
891
892 ret = intel_gvt_hypervisor_set_wp_page(vgpu, &s->guest_page);
893 if (ret)
894 goto fail;
895
896 ret = ppgtt_populate_shadow_page(s);
897 if (ret)
898 goto fail;
899
900 trace_spt_change(vgpu->id, "new", s, s->guest_page.gfn,
901 s->shadow_page.type);
902 }
903 return s;
904fail:
905 gvt_err("vgpu%d: fail: shadow page %p guest entry 0x%llx type %d\n",
906 vgpu->id, s, we->val64, we->type);
907 return ERR_PTR(ret);
908}
909
910static inline void ppgtt_generate_shadow_entry(struct intel_gvt_gtt_entry *se,
911 struct intel_vgpu_ppgtt_spt *s, struct intel_gvt_gtt_entry *ge)
912{
913 struct intel_gvt_gtt_pte_ops *ops = s->vgpu->gvt->gtt.pte_ops;
914
915 se->type = ge->type;
916 se->val64 = ge->val64;
917
918 ops->set_pfn(se, s->shadow_page.mfn);
919}
920
921static int ppgtt_populate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
922{
923 struct intel_vgpu *vgpu = spt->vgpu;
924 struct intel_vgpu_ppgtt_spt *s;
925 struct intel_gvt_gtt_entry se, ge;
926 unsigned long i;
927 int ret;
928
929 trace_spt_change(spt->vgpu->id, "born", spt,
930 spt->guest_page.gfn, spt->shadow_page.type);
931
932 if (gtt_type_is_pte_pt(spt->shadow_page.type)) {
933 for_each_present_guest_entry(spt, &ge, i) {
934 ret = gtt_entry_p2m(vgpu, &ge, &se);
935 if (ret)
936 goto fail;
937 ppgtt_set_shadow_entry(spt, &se, i);
938 }
939 return 0;
940 }
941
942 for_each_present_guest_entry(spt, &ge, i) {
943 if (!gtt_type_is_pt(get_next_pt_type(ge.type))) {
944 gvt_err("GVT doesn't support pse bit now\n");
945 ret = -EINVAL;
946 goto fail;
947 }
948
949 s = ppgtt_populate_shadow_page_by_guest_entry(vgpu, &ge);
950 if (IS_ERR(s)) {
951 ret = PTR_ERR(s);
952 goto fail;
953 }
954 ppgtt_get_shadow_entry(spt, &se, i);
955 ppgtt_generate_shadow_entry(&se, s, &ge);
956 ppgtt_set_shadow_entry(spt, &se, i);
957 }
958 return 0;
959fail:
960 gvt_err("vgpu%d: fail: shadow page %p guest entry 0x%llx type %d\n",
961 vgpu->id, spt, ge.val64, ge.type);
962 return ret;
963}
964
965static int ppgtt_handle_guest_entry_removal(struct intel_vgpu_guest_page *gpt,
966 unsigned long index)
967{
968 struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt);
969 struct intel_vgpu_shadow_page *sp = &spt->shadow_page;
970 struct intel_vgpu *vgpu = spt->vgpu;
971 struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
972 struct intel_gvt_gtt_entry e;
973 int ret;
974
975 ppgtt_get_shadow_entry(spt, &e, index);
976
977 trace_gpt_change(spt->vgpu->id, "remove", spt, sp->type, e.val64,
978 index);
979
980 if (!ops->test_present(&e))
981 return 0;
982
983 if (ops->get_pfn(&e) == vgpu->gtt.scratch_pt[sp->type].page_mfn)
984 return 0;
985
986 if (gtt_type_is_pt(get_next_pt_type(e.type))) {
987 struct intel_vgpu_ppgtt_spt *s =
988 ppgtt_find_shadow_page(vgpu, ops->get_pfn(&e));
989 if (!s) {
990 gvt_err("fail to find guest page\n");
991 ret = -ENXIO;
992 goto fail;
993 }
994 ret = ppgtt_invalidate_shadow_page(s);
995 if (ret)
996 goto fail;
997 }
998 ops->set_pfn(&e, vgpu->gtt.scratch_pt[sp->type].page_mfn);
999 ppgtt_set_shadow_entry(spt, &e, index);
1000 return 0;
1001fail:
1002 gvt_err("vgpu%d: fail: shadow page %p guest entry 0x%llx type %d\n",
1003 vgpu->id, spt, e.val64, e.type);
1004 return ret;
1005}
1006
1007static int ppgtt_handle_guest_entry_add(struct intel_vgpu_guest_page *gpt,
1008 struct intel_gvt_gtt_entry *we, unsigned long index)
1009{
1010 struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt);
1011 struct intel_vgpu_shadow_page *sp = &spt->shadow_page;
1012 struct intel_vgpu *vgpu = spt->vgpu;
1013 struct intel_gvt_gtt_entry m;
1014 struct intel_vgpu_ppgtt_spt *s;
1015 int ret;
1016
1017 trace_gpt_change(spt->vgpu->id, "add", spt, sp->type,
1018 we->val64, index);
1019
1020 if (gtt_type_is_pt(get_next_pt_type(we->type))) {
1021 s = ppgtt_populate_shadow_page_by_guest_entry(vgpu, we);
1022 if (IS_ERR(s)) {
1023 ret = PTR_ERR(s);
1024 goto fail;
1025 }
1026 ppgtt_get_shadow_entry(spt, &m, index);
1027 ppgtt_generate_shadow_entry(&m, s, we);
1028 ppgtt_set_shadow_entry(spt, &m, index);
1029 } else {
1030 ret = gtt_entry_p2m(vgpu, we, &m);
1031 if (ret)
1032 goto fail;
1033 ppgtt_set_shadow_entry(spt, &m, index);
1034 }
1035 return 0;
1036fail:
1037 gvt_err("vgpu%d: fail: spt %p guest entry 0x%llx type %d\n", vgpu->id,
1038 spt, we->val64, we->type);
1039 return ret;
1040}
1041
1042static int sync_oos_page(struct intel_vgpu *vgpu,
1043 struct intel_vgpu_oos_page *oos_page)
1044{
1045 const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
1046 struct intel_gvt *gvt = vgpu->gvt;
1047 struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
1048 struct intel_vgpu_ppgtt_spt *spt =
1049 guest_page_to_ppgtt_spt(oos_page->guest_page);
1050 struct intel_gvt_gtt_entry old, new, m;
1051 int index;
1052 int ret;
1053
1054 trace_oos_change(vgpu->id, "sync", oos_page->id,
1055 oos_page->guest_page, spt->guest_page_type);
1056
1057 old.type = new.type = get_entry_type(spt->guest_page_type);
1058 old.val64 = new.val64 = 0;
1059
1060 for (index = 0; index < (GTT_PAGE_SIZE >> info->gtt_entry_size_shift);
1061 index++) {
1062 ops->get_entry(oos_page->mem, &old, index, false, 0, vgpu);
1063 ops->get_entry(NULL, &new, index, true,
1064 oos_page->guest_page->gfn << PAGE_SHIFT, vgpu);
1065
1066 if (old.val64 == new.val64
1067 && !test_and_clear_bit(index, spt->post_shadow_bitmap))
1068 continue;
1069
1070 trace_oos_sync(vgpu->id, oos_page->id,
1071 oos_page->guest_page, spt->guest_page_type,
1072 new.val64, index);
1073
1074 ret = gtt_entry_p2m(vgpu, &new, &m);
1075 if (ret)
1076 return ret;
1077
1078 ops->set_entry(oos_page->mem, &new, index, false, 0, vgpu);
1079 ppgtt_set_shadow_entry(spt, &m, index);
1080 }
1081
1082 oos_page->guest_page->write_cnt = 0;
1083 list_del_init(&spt->post_shadow_list);
1084 return 0;
1085}
1086
1087static int detach_oos_page(struct intel_vgpu *vgpu,
1088 struct intel_vgpu_oos_page *oos_page)
1089{
1090 struct intel_gvt *gvt = vgpu->gvt;
1091 struct intel_vgpu_ppgtt_spt *spt =
1092 guest_page_to_ppgtt_spt(oos_page->guest_page);
1093
1094 trace_oos_change(vgpu->id, "detach", oos_page->id,
1095 oos_page->guest_page, spt->guest_page_type);
1096
1097 oos_page->guest_page->write_cnt = 0;
1098 oos_page->guest_page->oos_page = NULL;
1099 oos_page->guest_page = NULL;
1100
1101 list_del_init(&oos_page->vm_list);
1102 list_move_tail(&oos_page->list, &gvt->gtt.oos_page_free_list_head);
1103
1104 return 0;
1105}
1106
1107static int attach_oos_page(struct intel_vgpu *vgpu,
1108 struct intel_vgpu_oos_page *oos_page,
1109 struct intel_vgpu_guest_page *gpt)
1110{
1111 struct intel_gvt *gvt = vgpu->gvt;
1112 int ret;
1113
1114 ret = intel_gvt_hypervisor_read_gpa(vgpu, gpt->gfn << GTT_PAGE_SHIFT,
1115 oos_page->mem, GTT_PAGE_SIZE);
1116 if (ret)
1117 return ret;
1118
1119 oos_page->guest_page = gpt;
1120 gpt->oos_page = oos_page;
1121
1122 list_move_tail(&oos_page->list, &gvt->gtt.oos_page_use_list_head);
1123
1124 trace_oos_change(vgpu->id, "attach", gpt->oos_page->id,
1125 gpt, guest_page_to_ppgtt_spt(gpt)->guest_page_type);
1126 return 0;
1127}
1128
1129static int ppgtt_set_guest_page_sync(struct intel_vgpu *vgpu,
1130 struct intel_vgpu_guest_page *gpt)
1131{
1132 int ret;
1133
1134 ret = intel_gvt_hypervisor_set_wp_page(vgpu, gpt);
1135 if (ret)
1136 return ret;
1137
1138 trace_oos_change(vgpu->id, "set page sync", gpt->oos_page->id,
1139 gpt, guest_page_to_ppgtt_spt(gpt)->guest_page_type);
1140
1141 list_del_init(&gpt->oos_page->vm_list);
1142 return sync_oos_page(vgpu, gpt->oos_page);
1143}
1144
1145static int ppgtt_allocate_oos_page(struct intel_vgpu *vgpu,
1146 struct intel_vgpu_guest_page *gpt)
1147{
1148 struct intel_gvt *gvt = vgpu->gvt;
1149 struct intel_gvt_gtt *gtt = &gvt->gtt;
1150 struct intel_vgpu_oos_page *oos_page = gpt->oos_page;
1151 int ret;
1152
1153 WARN(oos_page, "shadow PPGTT page has already has a oos page\n");
1154
1155 if (list_empty(>t->oos_page_free_list_head)) {
1156 oos_page = container_of(gtt->oos_page_use_list_head.next,
1157 struct intel_vgpu_oos_page, list);
1158 ret = ppgtt_set_guest_page_sync(vgpu, oos_page->guest_page);
1159 if (ret)
1160 return ret;
1161 ret = detach_oos_page(vgpu, oos_page);
1162 if (ret)
1163 return ret;
1164 } else
1165 oos_page = container_of(gtt->oos_page_free_list_head.next,
1166 struct intel_vgpu_oos_page, list);
1167 return attach_oos_page(vgpu, oos_page, gpt);
1168}
1169
1170static int ppgtt_set_guest_page_oos(struct intel_vgpu *vgpu,
1171 struct intel_vgpu_guest_page *gpt)
1172{
1173 struct intel_vgpu_oos_page *oos_page = gpt->oos_page;
1174
1175 if (WARN(!oos_page, "shadow PPGTT page should have a oos page\n"))
1176 return -EINVAL;
1177
1178 trace_oos_change(vgpu->id, "set page out of sync", gpt->oos_page->id,
1179 gpt, guest_page_to_ppgtt_spt(gpt)->guest_page_type);
1180
1181 list_add_tail(&oos_page->vm_list, &vgpu->gtt.oos_page_list_head);
1182 return intel_gvt_hypervisor_unset_wp_page(vgpu, gpt);
1183}
1184
1185/**
1186 * intel_vgpu_sync_oos_pages - sync all the out-of-synced shadow for vGPU
1187 * @vgpu: a vGPU
1188 *
1189 * This function is called before submitting a guest workload to host,
1190 * to sync all the out-of-synced shadow for vGPU
1191 *
1192 * Returns:
1193 * Zero on success, negative error code if failed.
1194 */
1195int intel_vgpu_sync_oos_pages(struct intel_vgpu *vgpu)
1196{
1197 struct list_head *pos, *n;
1198 struct intel_vgpu_oos_page *oos_page;
1199 int ret;
1200
1201 if (!enable_out_of_sync)
1202 return 0;
1203
1204 list_for_each_safe(pos, n, &vgpu->gtt.oos_page_list_head) {
1205 oos_page = container_of(pos,
1206 struct intel_vgpu_oos_page, vm_list);
1207 ret = ppgtt_set_guest_page_sync(vgpu, oos_page->guest_page);
1208 if (ret)
1209 return ret;
1210 }
1211 return 0;
1212}
1213
1214/*
1215 * The heart of PPGTT shadow page table.
1216 */
1217static int ppgtt_handle_guest_write_page_table(
1218 struct intel_vgpu_guest_page *gpt,
1219 struct intel_gvt_gtt_entry *we, unsigned long index)
1220{
1221 struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt);
1222 struct intel_vgpu *vgpu = spt->vgpu;
1223 struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
1224
1225 int ret;
1226 int new_present;
1227
1228 new_present = ops->test_present(we);
1229
1230 ret = ppgtt_handle_guest_entry_removal(gpt, index);
1231 if (ret)
1232 goto fail;
1233
1234 if (new_present) {
1235 ret = ppgtt_handle_guest_entry_add(gpt, we, index);
1236 if (ret)
1237 goto fail;
1238 }
1239 return 0;
1240fail:
1241 gvt_err("vgpu%d: fail: shadow page %p guest entry 0x%llx type %d.\n",
1242 vgpu->id, spt, we->val64, we->type);
1243 return ret;
1244}
1245
1246static inline bool can_do_out_of_sync(struct intel_vgpu_guest_page *gpt)
1247{
1248 return enable_out_of_sync
1249 && gtt_type_is_pte_pt(
1250 guest_page_to_ppgtt_spt(gpt)->guest_page_type)
1251 && gpt->write_cnt >= 2;
1252}
1253
1254static void ppgtt_set_post_shadow(struct intel_vgpu_ppgtt_spt *spt,
1255 unsigned long index)
1256{
1257 set_bit(index, spt->post_shadow_bitmap);
1258 if (!list_empty(&spt->post_shadow_list))
1259 return;
1260
1261 list_add_tail(&spt->post_shadow_list,
1262 &spt->vgpu->gtt.post_shadow_list_head);
1263}
1264
1265/**
1266 * intel_vgpu_flush_post_shadow - flush the post shadow transactions
1267 * @vgpu: a vGPU
1268 *
1269 * This function is called before submitting a guest workload to host,
1270 * to flush all the post shadows for a vGPU.
1271 *
1272 * Returns:
1273 * Zero on success, negative error code if failed.
1274 */
1275int intel_vgpu_flush_post_shadow(struct intel_vgpu *vgpu)
1276{
1277 struct list_head *pos, *n;
1278 struct intel_vgpu_ppgtt_spt *spt;
1279 struct intel_gvt_gtt_entry ge;
1280 unsigned long index;
1281 int ret;
1282
1283 list_for_each_safe(pos, n, &vgpu->gtt.post_shadow_list_head) {
1284 spt = container_of(pos, struct intel_vgpu_ppgtt_spt,
1285 post_shadow_list);
1286
1287 for_each_set_bit(index, spt->post_shadow_bitmap,
1288 GTT_ENTRY_NUM_IN_ONE_PAGE) {
1289 ppgtt_get_guest_entry(spt, &ge, index);
1290
1291 ret = ppgtt_handle_guest_write_page_table(
1292 &spt->guest_page, &ge, index);
1293 if (ret)
1294 return ret;
1295 clear_bit(index, spt->post_shadow_bitmap);
1296 }
1297 list_del_init(&spt->post_shadow_list);
1298 }
1299 return 0;
1300}
1301
1302static int ppgtt_handle_guest_write_page_table_bytes(void *gp,
1303 u64 pa, void *p_data, int bytes)
1304{
1305 struct intel_vgpu_guest_page *gpt = (struct intel_vgpu_guest_page *)gp;
1306 struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt);
1307 struct intel_vgpu *vgpu = spt->vgpu;
1308 struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
1309 const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
1310 struct intel_gvt_gtt_entry we;
1311 unsigned long index;
1312 int ret;
1313
1314 index = (pa & (PAGE_SIZE - 1)) >> info->gtt_entry_size_shift;
1315
1316 ppgtt_get_guest_entry(spt, &we, index);
1317
1318 ops->test_pse(&we);
1319
1320 if (bytes == info->gtt_entry_size) {
1321 ret = ppgtt_handle_guest_write_page_table(gpt, &we, index);
1322 if (ret)
1323 return ret;
1324 } else {
1325 if (!test_bit(index, spt->post_shadow_bitmap)) {
1326 ret = ppgtt_handle_guest_entry_removal(gpt, index);
1327 if (ret)
1328 return ret;
1329 }
1330
1331 ppgtt_set_post_shadow(spt, index);
1332 }
1333
1334 if (!enable_out_of_sync)
1335 return 0;
1336
1337 gpt->write_cnt++;
1338
1339 if (gpt->oos_page)
1340 ops->set_entry(gpt->oos_page->mem, &we, index,
1341 false, 0, vgpu);
1342
1343 if (can_do_out_of_sync(gpt)) {
1344 if (!gpt->oos_page)
1345 ppgtt_allocate_oos_page(vgpu, gpt);
1346
1347 ret = ppgtt_set_guest_page_oos(vgpu, gpt);
1348 if (ret < 0)
1349 return ret;
1350 }
1351 return 0;
1352}
1353
1354/*
1355 * mm page table allocation policy for bdw+
1356 * - for ggtt, only virtual page table will be allocated.
1357 * - for ppgtt, dedicated virtual/shadow page table will be allocated.
1358 */
1359static int gen8_mm_alloc_page_table(struct intel_vgpu_mm *mm)
1360{
1361 struct intel_vgpu *vgpu = mm->vgpu;
1362 struct intel_gvt *gvt = vgpu->gvt;
1363 const struct intel_gvt_device_info *info = &gvt->device_info;
1364 void *mem;
1365
1366 if (mm->type == INTEL_GVT_MM_PPGTT) {
1367 mm->page_table_entry_cnt = 4;
1368 mm->page_table_entry_size = mm->page_table_entry_cnt *
1369 info->gtt_entry_size;
1370 mem = kzalloc(mm->has_shadow_page_table ?
1371 mm->page_table_entry_size * 2
1372 : mm->page_table_entry_size, GFP_KERNEL);
1373 if (!mem)
1374 return -ENOMEM;
1375 mm->virtual_page_table = mem;
1376 if (!mm->has_shadow_page_table)
1377 return 0;
1378 mm->shadow_page_table = mem + mm->page_table_entry_size;
1379 } else if (mm->type == INTEL_GVT_MM_GGTT) {
1380 mm->page_table_entry_cnt =
1381 (gvt_ggtt_gm_sz(gvt) >> GTT_PAGE_SHIFT);
1382 mm->page_table_entry_size = mm->page_table_entry_cnt *
1383 info->gtt_entry_size;
1384 mem = vzalloc(mm->page_table_entry_size);
1385 if (!mem)
1386 return -ENOMEM;
1387 mm->virtual_page_table = mem;
1388 }
1389 return 0;
1390}
1391
1392static void gen8_mm_free_page_table(struct intel_vgpu_mm *mm)
1393{
1394 if (mm->type == INTEL_GVT_MM_PPGTT) {
1395 kfree(mm->virtual_page_table);
1396 } else if (mm->type == INTEL_GVT_MM_GGTT) {
1397 if (mm->virtual_page_table)
1398 vfree(mm->virtual_page_table);
1399 }
1400 mm->virtual_page_table = mm->shadow_page_table = NULL;
1401}
1402
1403static void invalidate_mm(struct intel_vgpu_mm *mm)
1404{
1405 struct intel_vgpu *vgpu = mm->vgpu;
1406 struct intel_gvt *gvt = vgpu->gvt;
1407 struct intel_gvt_gtt *gtt = &gvt->gtt;
1408 struct intel_gvt_gtt_pte_ops *ops = gtt->pte_ops;
1409 struct intel_gvt_gtt_entry se;
1410 int i;
1411
1412 if (WARN_ON(!mm->has_shadow_page_table || !mm->shadowed))
1413 return;
1414
1415 for (i = 0; i < mm->page_table_entry_cnt; i++) {
1416 ppgtt_get_shadow_root_entry(mm, &se, i);
1417 if (!ops->test_present(&se))
1418 continue;
1419 ppgtt_invalidate_shadow_page_by_shadow_entry(
1420 vgpu, &se);
1421 se.val64 = 0;
1422 ppgtt_set_shadow_root_entry(mm, &se, i);
1423
1424 trace_gpt_change(vgpu->id, "destroy root pointer",
1425 NULL, se.type, se.val64, i);
1426 }
1427 mm->shadowed = false;
1428}
1429
1430/**
1431 * intel_vgpu_destroy_mm - destroy a mm object
1432 * @mm: a kref object
1433 *
1434 * This function is used to destroy a mm object for vGPU
1435 *
1436 */
1437void intel_vgpu_destroy_mm(struct kref *mm_ref)
1438{
1439 struct intel_vgpu_mm *mm = container_of(mm_ref, typeof(*mm), ref);
1440 struct intel_vgpu *vgpu = mm->vgpu;
1441 struct intel_gvt *gvt = vgpu->gvt;
1442 struct intel_gvt_gtt *gtt = &gvt->gtt;
1443
1444 if (!mm->initialized)
1445 goto out;
1446
1447 list_del(&mm->list);
1448 list_del(&mm->lru_list);
1449
1450 if (mm->has_shadow_page_table)
1451 invalidate_mm(mm);
1452
1453 gtt->mm_free_page_table(mm);
1454out:
1455 kfree(mm);
1456}
1457
1458static int shadow_mm(struct intel_vgpu_mm *mm)
1459{
1460 struct intel_vgpu *vgpu = mm->vgpu;
1461 struct intel_gvt *gvt = vgpu->gvt;
1462 struct intel_gvt_gtt *gtt = &gvt->gtt;
1463 struct intel_gvt_gtt_pte_ops *ops = gtt->pte_ops;
1464 struct intel_vgpu_ppgtt_spt *spt;
1465 struct intel_gvt_gtt_entry ge, se;
1466 int i;
1467 int ret;
1468
1469 if (WARN_ON(!mm->has_shadow_page_table || mm->shadowed))
1470 return 0;
1471
1472 mm->shadowed = true;
1473
1474 for (i = 0; i < mm->page_table_entry_cnt; i++) {
1475 ppgtt_get_guest_root_entry(mm, &ge, i);
1476 if (!ops->test_present(&ge))
1477 continue;
1478
1479 trace_gpt_change(vgpu->id, __func__, NULL,
1480 ge.type, ge.val64, i);
1481
1482 spt = ppgtt_populate_shadow_page_by_guest_entry(vgpu, &ge);
1483 if (IS_ERR(spt)) {
1484 gvt_err("fail to populate guest root pointer\n");
1485 ret = PTR_ERR(spt);
1486 goto fail;
1487 }
1488 ppgtt_generate_shadow_entry(&se, spt, &ge);
1489 ppgtt_set_shadow_root_entry(mm, &se, i);
1490
1491 trace_gpt_change(vgpu->id, "populate root pointer",
1492 NULL, se.type, se.val64, i);
1493 }
1494 return 0;
1495fail:
1496 invalidate_mm(mm);
1497 return ret;
1498}
1499
1500/**
1501 * intel_vgpu_create_mm - create a mm object for a vGPU
1502 * @vgpu: a vGPU
1503 * @mm_type: mm object type, should be PPGTT or GGTT
1504 * @virtual_page_table: page table root pointers. Could be NULL if user wants
1505 * to populate shadow later.
1506 * @page_table_level: describe the page table level of the mm object
1507 * @pde_base_index: pde root pointer base in GGTT MMIO.
1508 *
1509 * This function is used to create a mm object for a vGPU.
1510 *
1511 * Returns:
1512 * Zero on success, negative error code in pointer if failed.
1513 */
1514struct intel_vgpu_mm *intel_vgpu_create_mm(struct intel_vgpu *vgpu,
1515 int mm_type, void *virtual_page_table, int page_table_level,
1516 u32 pde_base_index)
1517{
1518 struct intel_gvt *gvt = vgpu->gvt;
1519 struct intel_gvt_gtt *gtt = &gvt->gtt;
1520 struct intel_vgpu_mm *mm;
1521 int ret;
1522
1523 mm = kzalloc(sizeof(*mm), GFP_KERNEL);
1524 if (!mm) {
1525 ret = -ENOMEM;
1526 goto fail;
1527 }
1528
1529 mm->type = mm_type;
1530
1531 if (page_table_level == 1)
1532 mm->page_table_entry_type = GTT_TYPE_GGTT_PTE;
1533 else if (page_table_level == 3)
1534 mm->page_table_entry_type = GTT_TYPE_PPGTT_ROOT_L3_ENTRY;
1535 else if (page_table_level == 4)
1536 mm->page_table_entry_type = GTT_TYPE_PPGTT_ROOT_L4_ENTRY;
1537 else {
1538 WARN_ON(1);
1539 ret = -EINVAL;
1540 goto fail;
1541 }
1542
1543 mm->page_table_level = page_table_level;
1544 mm->pde_base_index = pde_base_index;
1545
1546 mm->vgpu = vgpu;
1547 mm->has_shadow_page_table = !!(mm_type == INTEL_GVT_MM_PPGTT);
1548
1549 kref_init(&mm->ref);
1550 atomic_set(&mm->pincount, 0);
1551 INIT_LIST_HEAD(&mm->list);
1552 INIT_LIST_HEAD(&mm->lru_list);
1553 list_add_tail(&mm->list, &vgpu->gtt.mm_list_head);
1554
1555 ret = gtt->mm_alloc_page_table(mm);
1556 if (ret) {
1557 gvt_err("fail to allocate page table for mm\n");
1558 goto fail;
1559 }
1560
1561 mm->initialized = true;
1562
1563 if (virtual_page_table)
1564 memcpy(mm->virtual_page_table, virtual_page_table,
1565 mm->page_table_entry_size);
1566
1567 if (mm->has_shadow_page_table) {
1568 ret = shadow_mm(mm);
1569 if (ret)
1570 goto fail;
1571 list_add_tail(&mm->lru_list, &gvt->gtt.mm_lru_list_head);
1572 }
1573 return mm;
1574fail:
1575 gvt_err("fail to create mm\n");
1576 if (mm)
1577 intel_gvt_mm_unreference(mm);
1578 return ERR_PTR(ret);
1579}
1580
1581/**
1582 * intel_vgpu_unpin_mm - decrease the pin count of a vGPU mm object
1583 * @mm: a vGPU mm object
1584 *
1585 * This function is called when user doesn't want to use a vGPU mm object
1586 */
1587void intel_vgpu_unpin_mm(struct intel_vgpu_mm *mm)
1588{
1589 if (WARN_ON(mm->type != INTEL_GVT_MM_PPGTT))
1590 return;
1591
1592 atomic_dec(&mm->pincount);
1593}
1594
1595/**
1596 * intel_vgpu_pin_mm - increase the pin count of a vGPU mm object
1597 * @vgpu: a vGPU
1598 *
1599 * This function is called when user wants to use a vGPU mm object. If this
1600 * mm object hasn't been shadowed yet, the shadow will be populated at this
1601 * time.
1602 *
1603 * Returns:
1604 * Zero on success, negative error code if failed.
1605 */
1606int intel_vgpu_pin_mm(struct intel_vgpu_mm *mm)
1607{
1608 int ret;
1609
1610 if (WARN_ON(mm->type != INTEL_GVT_MM_PPGTT))
1611 return 0;
1612
1613 atomic_inc(&mm->pincount);
1614
1615 if (!mm->shadowed) {
1616 ret = shadow_mm(mm);
1617 if (ret)
1618 return ret;
1619 }
1620
1621 list_del_init(&mm->lru_list);
1622 list_add_tail(&mm->lru_list, &mm->vgpu->gvt->gtt.mm_lru_list_head);
1623 return 0;
1624}
1625
1626static int reclaim_one_mm(struct intel_gvt *gvt)
1627{
1628 struct intel_vgpu_mm *mm;
1629 struct list_head *pos, *n;
1630
1631 list_for_each_safe(pos, n, &gvt->gtt.mm_lru_list_head) {
1632 mm = container_of(pos, struct intel_vgpu_mm, lru_list);
1633
1634 if (mm->type != INTEL_GVT_MM_PPGTT)
1635 continue;
1636 if (atomic_read(&mm->pincount))
1637 continue;
1638
1639 list_del_init(&mm->lru_list);
1640 invalidate_mm(mm);
1641 return 1;
1642 }
1643 return 0;
1644}
1645
1646/*
1647 * GMA translation APIs.
1648 */
1649static inline int ppgtt_get_next_level_entry(struct intel_vgpu_mm *mm,
1650 struct intel_gvt_gtt_entry *e, unsigned long index, bool guest)
1651{
1652 struct intel_vgpu *vgpu = mm->vgpu;
1653 struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
1654 struct intel_vgpu_ppgtt_spt *s;
1655
1656 if (WARN_ON(!mm->has_shadow_page_table))
1657 return -EINVAL;
1658
1659 s = ppgtt_find_shadow_page(vgpu, ops->get_pfn(e));
1660 if (!s)
1661 return -ENXIO;
1662
1663 if (!guest)
1664 ppgtt_get_shadow_entry(s, e, index);
1665 else
1666 ppgtt_get_guest_entry(s, e, index);
1667 return 0;
1668}
1669
1670/**
1671 * intel_vgpu_gma_to_gpa - translate a gma to GPA
1672 * @mm: mm object. could be a PPGTT or GGTT mm object
1673 * @gma: graphics memory address in this mm object
1674 *
1675 * This function is used to translate a graphics memory address in specific
1676 * graphics memory space to guest physical address.
1677 *
1678 * Returns:
1679 * Guest physical address on success, INTEL_GVT_INVALID_ADDR if failed.
1680 */
1681unsigned long intel_vgpu_gma_to_gpa(struct intel_vgpu_mm *mm, unsigned long gma)
1682{
1683 struct intel_vgpu *vgpu = mm->vgpu;
1684 struct intel_gvt *gvt = vgpu->gvt;
1685 struct intel_gvt_gtt_pte_ops *pte_ops = gvt->gtt.pte_ops;
1686 struct intel_gvt_gtt_gma_ops *gma_ops = gvt->gtt.gma_ops;
1687 unsigned long gpa = INTEL_GVT_INVALID_ADDR;
1688 unsigned long gma_index[4];
1689 struct intel_gvt_gtt_entry e;
1690 int i, index;
1691 int ret;
1692
1693 if (mm->type != INTEL_GVT_MM_GGTT && mm->type != INTEL_GVT_MM_PPGTT)
1694 return INTEL_GVT_INVALID_ADDR;
1695
1696 if (mm->type == INTEL_GVT_MM_GGTT) {
1697 if (!vgpu_gmadr_is_valid(vgpu, gma))
1698 goto err;
1699
1700 ggtt_get_guest_entry(mm, &e,
1701 gma_ops->gma_to_ggtt_pte_index(gma));
1702 gpa = (pte_ops->get_pfn(&e) << GTT_PAGE_SHIFT)
1703 + (gma & ~GTT_PAGE_MASK);
1704
1705 trace_gma_translate(vgpu->id, "ggtt", 0, 0, gma, gpa);
1706 return gpa;
1707 }
1708
1709 switch (mm->page_table_level) {
1710 case 4:
1711 ppgtt_get_shadow_root_entry(mm, &e, 0);
1712 gma_index[0] = gma_ops->gma_to_pml4_index(gma);
1713 gma_index[1] = gma_ops->gma_to_l4_pdp_index(gma);
1714 gma_index[2] = gma_ops->gma_to_pde_index(gma);
1715 gma_index[3] = gma_ops->gma_to_pte_index(gma);
1716 index = 4;
1717 break;
1718 case 3:
1719 ppgtt_get_shadow_root_entry(mm, &e,
1720 gma_ops->gma_to_l3_pdp_index(gma));
1721 gma_index[0] = gma_ops->gma_to_pde_index(gma);
1722 gma_index[1] = gma_ops->gma_to_pte_index(gma);
1723 index = 2;
1724 break;
1725 case 2:
1726 ppgtt_get_shadow_root_entry(mm, &e,
1727 gma_ops->gma_to_pde_index(gma));
1728 gma_index[0] = gma_ops->gma_to_pte_index(gma);
1729 index = 1;
1730 break;
1731 default:
1732 WARN_ON(1);
1733 goto err;
1734 }
1735
1736 /* walk into the shadow page table and get gpa from guest entry */
1737 for (i = 0; i < index; i++) {
1738 ret = ppgtt_get_next_level_entry(mm, &e, gma_index[i],
1739 (i == index - 1));
1740 if (ret)
1741 goto err;
1742 }
1743
1744 gpa = (pte_ops->get_pfn(&e) << GTT_PAGE_SHIFT)
1745 + (gma & ~GTT_PAGE_MASK);
1746
1747 trace_gma_translate(vgpu->id, "ppgtt", 0,
1748 mm->page_table_level, gma, gpa);
1749 return gpa;
1750err:
1751 gvt_err("invalid mm type: %d gma %lx\n", mm->type, gma);
1752 return INTEL_GVT_INVALID_ADDR;
1753}
1754
1755static int emulate_gtt_mmio_read(struct intel_vgpu *vgpu,
1756 unsigned int off, void *p_data, unsigned int bytes)
1757{
1758 struct intel_vgpu_mm *ggtt_mm = vgpu->gtt.ggtt_mm;
1759 const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
1760 unsigned long index = off >> info->gtt_entry_size_shift;
1761 struct intel_gvt_gtt_entry e;
1762
1763 if (bytes != 4 && bytes != 8)
1764 return -EINVAL;
1765
1766 ggtt_get_guest_entry(ggtt_mm, &e, index);
1767 memcpy(p_data, (void *)&e.val64 + (off & (info->gtt_entry_size - 1)),
1768 bytes);
1769 return 0;
1770}
1771
1772/**
1773 * intel_vgpu_emulate_gtt_mmio_read - emulate GTT MMIO register read
1774 * @vgpu: a vGPU
1775 * @off: register offset
1776 * @p_data: data will be returned to guest
1777 * @bytes: data length
1778 *
1779 * This function is used to emulate the GTT MMIO register read
1780 *
1781 * Returns:
1782 * Zero on success, error code if failed.
1783 */
1784int intel_vgpu_emulate_gtt_mmio_read(struct intel_vgpu *vgpu, unsigned int off,
1785 void *p_data, unsigned int bytes)
1786{
1787 const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
1788 int ret;
1789
1790 if (bytes != 4 && bytes != 8)
1791 return -EINVAL;
1792
1793 off -= info->gtt_start_offset;
1794 ret = emulate_gtt_mmio_read(vgpu, off, p_data, bytes);
1795 return ret;
1796}
1797
1798static int emulate_gtt_mmio_write(struct intel_vgpu *vgpu, unsigned int off,
1799 void *p_data, unsigned int bytes)
1800{
1801 struct intel_gvt *gvt = vgpu->gvt;
1802 const struct intel_gvt_device_info *info = &gvt->device_info;
1803 struct intel_vgpu_mm *ggtt_mm = vgpu->gtt.ggtt_mm;
1804 struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
1805 unsigned long g_gtt_index = off >> info->gtt_entry_size_shift;
1806 unsigned long gma;
1807 struct intel_gvt_gtt_entry e, m;
1808 int ret;
1809
1810 if (bytes != 4 && bytes != 8)
1811 return -EINVAL;
1812
1813 gma = g_gtt_index << GTT_PAGE_SHIFT;
1814
1815 /* the VM may configure the whole GM space when ballooning is used */
1816 if (WARN_ONCE(!vgpu_gmadr_is_valid(vgpu, gma),
1817 "vgpu%d: found oob ggtt write, offset %x\n",
1818 vgpu->id, off)) {
1819 return 0;
1820 }
1821
1822 ggtt_get_guest_entry(ggtt_mm, &e, g_gtt_index);
1823
1824 memcpy((void *)&e.val64 + (off & (info->gtt_entry_size - 1)), p_data,
1825 bytes);
1826
1827 if (ops->test_present(&e)) {
1828 ret = gtt_entry_p2m(vgpu, &e, &m);
1829 if (ret) {
1830 gvt_err("vgpu%d: fail to translate guest gtt entry\n",
1831 vgpu->id);
1832 return ret;
1833 }
1834 } else {
1835 m = e;
1836 m.val64 = 0;
1837 }
1838
1839 ggtt_set_shadow_entry(ggtt_mm, &m, g_gtt_index);
1840 ggtt_set_guest_entry(ggtt_mm, &e, g_gtt_index);
1841 return 0;
1842}
1843
1844/*
1845 * intel_vgpu_emulate_gtt_mmio_write - emulate GTT MMIO register write
1846 * @vgpu: a vGPU
1847 * @off: register offset
1848 * @p_data: data from guest write
1849 * @bytes: data length
1850 *
1851 * This function is used to emulate the GTT MMIO register write
1852 *
1853 * Returns:
1854 * Zero on success, error code if failed.
1855 */
1856int intel_vgpu_emulate_gtt_mmio_write(struct intel_vgpu *vgpu, unsigned int off,
1857 void *p_data, unsigned int bytes)
1858{
1859 const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
1860 int ret;
1861
1862 if (bytes != 4 && bytes != 8)
1863 return -EINVAL;
1864
1865 off -= info->gtt_start_offset;
1866 ret = emulate_gtt_mmio_write(vgpu, off, p_data, bytes);
1867 return ret;
1868}
1869
1870static int alloc_scratch_pages(struct intel_vgpu *vgpu,
1871 intel_gvt_gtt_type_t type)
1872{
1873 struct intel_vgpu_gtt *gtt = &vgpu->gtt;
1874 struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
1875 int page_entry_num = GTT_PAGE_SIZE >>
1876 vgpu->gvt->device_info.gtt_entry_size_shift;
1877 void *scratch_pt;
1878 unsigned long mfn;
1879 int i;
1880
1881 if (WARN_ON(type < GTT_TYPE_PPGTT_PTE_PT || type >= GTT_TYPE_MAX))
1882 return -EINVAL;
1883
1884 scratch_pt = (void *)get_zeroed_page(GFP_KERNEL);
1885 if (!scratch_pt) {
1886 gvt_err("fail to allocate scratch page\n");
1887 return -ENOMEM;
1888 }
1889
1890 mfn = intel_gvt_hypervisor_virt_to_mfn(scratch_pt);
1891 if (mfn == INTEL_GVT_INVALID_ADDR) {
1892 gvt_err("fail to translate vaddr:0x%lx\n", (unsigned long)scratch_pt);
1893 free_page((unsigned long)scratch_pt);
1894 return -EFAULT;
1895 }
1896 gtt->scratch_pt[type].page_mfn = mfn;
1897 gtt->scratch_pt[type].page = virt_to_page(scratch_pt);
1898 gvt_dbg_mm("vgpu%d create scratch_pt: type %d mfn=0x%lx\n",
1899 vgpu->id, type, mfn);
1900
1901 /* Build the tree by full filled the scratch pt with the entries which
1902 * point to the next level scratch pt or scratch page. The
1903 * scratch_pt[type] indicate the scratch pt/scratch page used by the
1904 * 'type' pt.
1905 * e.g. scratch_pt[GTT_TYPE_PPGTT_PDE_PT] is used by
1906 * GTT_TYPE_PPGTT_PDE_PT level pt, that means this scratch_pt it self
1907 * is GTT_TYPE_PPGTT_PTE_PT, and full filled by scratch page mfn.
1908 */
1909 if (type > GTT_TYPE_PPGTT_PTE_PT && type < GTT_TYPE_MAX) {
1910 struct intel_gvt_gtt_entry se;
1911
1912 memset(&se, 0, sizeof(struct intel_gvt_gtt_entry));
1913 se.type = get_entry_type(type - 1);
1914 ops->set_pfn(&se, gtt->scratch_pt[type - 1].page_mfn);
1915
1916 /* The entry parameters like present/writeable/cache type
1917 * set to the same as i915's scratch page tree.
1918 */
1919 se.val64 |= _PAGE_PRESENT | _PAGE_RW;
1920 if (type == GTT_TYPE_PPGTT_PDE_PT)
1921 se.val64 |= PPAT_CACHED_INDEX;
1922
1923 for (i = 0; i < page_entry_num; i++)
1924 ops->set_entry(scratch_pt, &se, i, false, 0, vgpu);
1925 }
1926
1927 return 0;
1928}
1929
1930static int release_scratch_page_tree(struct intel_vgpu *vgpu)
1931{
1932 int i;
1933
1934 for (i = GTT_TYPE_PPGTT_PTE_PT; i < GTT_TYPE_MAX; i++) {
1935 if (vgpu->gtt.scratch_pt[i].page != NULL) {
1936 __free_page(vgpu->gtt.scratch_pt[i].page);
1937 vgpu->gtt.scratch_pt[i].page = NULL;
1938 vgpu->gtt.scratch_pt[i].page_mfn = 0;
1939 }
1940 }
1941
1942 return 0;
1943}
1944
1945static int create_scratch_page_tree(struct intel_vgpu *vgpu)
1946{
1947 int i, ret;
1948
1949 for (i = GTT_TYPE_PPGTT_PTE_PT; i < GTT_TYPE_MAX; i++) {
1950 ret = alloc_scratch_pages(vgpu, i);
1951 if (ret)
1952 goto err;
1953 }
1954
1955 return 0;
1956
1957err:
1958 release_scratch_page_tree(vgpu);
1959 return ret;
1960}
1961
1962/**
1963 * intel_vgpu_init_gtt - initialize per-vGPU graphics memory virulization
1964 * @vgpu: a vGPU
1965 *
1966 * This function is used to initialize per-vGPU graphics memory virtualization
1967 * components.
1968 *
1969 * Returns:
1970 * Zero on success, error code if failed.
1971 */
1972int intel_vgpu_init_gtt(struct intel_vgpu *vgpu)
1973{
1974 struct intel_vgpu_gtt *gtt = &vgpu->gtt;
1975 struct intel_vgpu_mm *ggtt_mm;
1976
1977 hash_init(gtt->guest_page_hash_table);
1978 hash_init(gtt->shadow_page_hash_table);
1979
1980 INIT_LIST_HEAD(>t->mm_list_head);
1981 INIT_LIST_HEAD(>t->oos_page_list_head);
1982 INIT_LIST_HEAD(>t->post_shadow_list_head);
1983
1984 intel_vgpu_reset_ggtt(vgpu);
1985
1986 ggtt_mm = intel_vgpu_create_mm(vgpu, INTEL_GVT_MM_GGTT,
1987 NULL, 1, 0);
1988 if (IS_ERR(ggtt_mm)) {
1989 gvt_err("fail to create mm for ggtt.\n");
1990 return PTR_ERR(ggtt_mm);
1991 }
1992
1993 gtt->ggtt_mm = ggtt_mm;
1994
1995 return create_scratch_page_tree(vgpu);
1996}
1997
1998/**
1999 * intel_vgpu_clean_gtt - clean up per-vGPU graphics memory virulization
2000 * @vgpu: a vGPU
2001 *
2002 * This function is used to clean up per-vGPU graphics memory virtualization
2003 * components.
2004 *
2005 * Returns:
2006 * Zero on success, error code if failed.
2007 */
2008void intel_vgpu_clean_gtt(struct intel_vgpu *vgpu)
2009{
2010 struct list_head *pos, *n;
2011 struct intel_vgpu_mm *mm;
2012
2013 ppgtt_free_all_shadow_page(vgpu);
2014 release_scratch_page_tree(vgpu);
2015
2016 list_for_each_safe(pos, n, &vgpu->gtt.mm_list_head) {
2017 mm = container_of(pos, struct intel_vgpu_mm, list);
2018 vgpu->gvt->gtt.mm_free_page_table(mm);
2019 list_del(&mm->list);
2020 list_del(&mm->lru_list);
2021 kfree(mm);
2022 }
2023}
2024
2025static void clean_spt_oos(struct intel_gvt *gvt)
2026{
2027 struct intel_gvt_gtt *gtt = &gvt->gtt;
2028 struct list_head *pos, *n;
2029 struct intel_vgpu_oos_page *oos_page;
2030
2031 WARN(!list_empty(>t->oos_page_use_list_head),
2032 "someone is still using oos page\n");
2033
2034 list_for_each_safe(pos, n, >t->oos_page_free_list_head) {
2035 oos_page = container_of(pos, struct intel_vgpu_oos_page, list);
2036 list_del(&oos_page->list);
2037 kfree(oos_page);
2038 }
2039}
2040
2041static int setup_spt_oos(struct intel_gvt *gvt)
2042{
2043 struct intel_gvt_gtt *gtt = &gvt->gtt;
2044 struct intel_vgpu_oos_page *oos_page;
2045 int i;
2046 int ret;
2047
2048 INIT_LIST_HEAD(>t->oos_page_free_list_head);
2049 INIT_LIST_HEAD(>t->oos_page_use_list_head);
2050
2051 for (i = 0; i < preallocated_oos_pages; i++) {
2052 oos_page = kzalloc(sizeof(*oos_page), GFP_KERNEL);
2053 if (!oos_page) {
2054 gvt_err("fail to pre-allocate oos page\n");
2055 ret = -ENOMEM;
2056 goto fail;
2057 }
2058
2059 INIT_LIST_HEAD(&oos_page->list);
2060 INIT_LIST_HEAD(&oos_page->vm_list);
2061 oos_page->id = i;
2062 list_add_tail(&oos_page->list, >t->oos_page_free_list_head);
2063 }
2064
2065 gvt_dbg_mm("%d oos pages preallocated\n", i);
2066
2067 return 0;
2068fail:
2069 clean_spt_oos(gvt);
2070 return ret;
2071}
2072
2073/**
2074 * intel_vgpu_find_ppgtt_mm - find a PPGTT mm object
2075 * @vgpu: a vGPU
2076 * @page_table_level: PPGTT page table level
2077 * @root_entry: PPGTT page table root pointers
2078 *
2079 * This function is used to find a PPGTT mm object from mm object pool
2080 *
2081 * Returns:
2082 * pointer to mm object on success, NULL if failed.
2083 */
2084struct intel_vgpu_mm *intel_vgpu_find_ppgtt_mm(struct intel_vgpu *vgpu,
2085 int page_table_level, void *root_entry)
2086{
2087 struct list_head *pos;
2088 struct intel_vgpu_mm *mm;
2089 u64 *src, *dst;
2090
2091 list_for_each(pos, &vgpu->gtt.mm_list_head) {
2092 mm = container_of(pos, struct intel_vgpu_mm, list);
2093 if (mm->type != INTEL_GVT_MM_PPGTT)
2094 continue;
2095
2096 if (mm->page_table_level != page_table_level)
2097 continue;
2098
2099 src = root_entry;
2100 dst = mm->virtual_page_table;
2101
2102 if (page_table_level == 3) {
2103 if (src[0] == dst[0]
2104 && src[1] == dst[1]
2105 && src[2] == dst[2]
2106 && src[3] == dst[3])
2107 return mm;
2108 } else {
2109 if (src[0] == dst[0])
2110 return mm;
2111 }
2112 }
2113 return NULL;
2114}
2115
2116/**
2117 * intel_vgpu_g2v_create_ppgtt_mm - create a PPGTT mm object from
2118 * g2v notification
2119 * @vgpu: a vGPU
2120 * @page_table_level: PPGTT page table level
2121 *
2122 * This function is used to create a PPGTT mm object from a guest to GVT-g
2123 * notification.
2124 *
2125 * Returns:
2126 * Zero on success, negative error code if failed.
2127 */
2128int intel_vgpu_g2v_create_ppgtt_mm(struct intel_vgpu *vgpu,
2129 int page_table_level)
2130{
2131 u64 *pdp = (u64 *)&vgpu_vreg64(vgpu, vgtif_reg(pdp[0]));
2132 struct intel_vgpu_mm *mm;
2133
2134 if (WARN_ON((page_table_level != 4) && (page_table_level != 3)))
2135 return -EINVAL;
2136
2137 mm = intel_vgpu_find_ppgtt_mm(vgpu, page_table_level, pdp);
2138 if (mm) {
2139 intel_gvt_mm_reference(mm);
2140 } else {
2141 mm = intel_vgpu_create_mm(vgpu, INTEL_GVT_MM_PPGTT,
2142 pdp, page_table_level, 0);
2143 if (IS_ERR(mm)) {
2144 gvt_err("fail to create mm\n");
2145 return PTR_ERR(mm);
2146 }
2147 }
2148 return 0;
2149}
2150
2151/**
2152 * intel_vgpu_g2v_destroy_ppgtt_mm - destroy a PPGTT mm object from
2153 * g2v notification
2154 * @vgpu: a vGPU
2155 * @page_table_level: PPGTT page table level
2156 *
2157 * This function is used to create a PPGTT mm object from a guest to GVT-g
2158 * notification.
2159 *
2160 * Returns:
2161 * Zero on success, negative error code if failed.
2162 */
2163int intel_vgpu_g2v_destroy_ppgtt_mm(struct intel_vgpu *vgpu,
2164 int page_table_level)
2165{
2166 u64 *pdp = (u64 *)&vgpu_vreg64(vgpu, vgtif_reg(pdp[0]));
2167 struct intel_vgpu_mm *mm;
2168
2169 if (WARN_ON((page_table_level != 4) && (page_table_level != 3)))
2170 return -EINVAL;
2171
2172 mm = intel_vgpu_find_ppgtt_mm(vgpu, page_table_level, pdp);
2173 if (!mm) {
2174 gvt_err("fail to find ppgtt instance.\n");
2175 return -EINVAL;
2176 }
2177 intel_gvt_mm_unreference(mm);
2178 return 0;
2179}
2180
2181/**
2182 * intel_gvt_init_gtt - initialize mm components of a GVT device
2183 * @gvt: GVT device
2184 *
2185 * This function is called at the initialization stage, to initialize
2186 * the mm components of a GVT device.
2187 *
2188 * Returns:
2189 * zero on success, negative error code if failed.
2190 */
2191int intel_gvt_init_gtt(struct intel_gvt *gvt)
2192{
2193 int ret;
2194 void *page;
2195
2196 gvt_dbg_core("init gtt\n");
2197
2198 if (IS_BROADWELL(gvt->dev_priv) || IS_SKYLAKE(gvt->dev_priv)) {
2199 gvt->gtt.pte_ops = &gen8_gtt_pte_ops;
2200 gvt->gtt.gma_ops = &gen8_gtt_gma_ops;
2201 gvt->gtt.mm_alloc_page_table = gen8_mm_alloc_page_table;
2202 gvt->gtt.mm_free_page_table = gen8_mm_free_page_table;
2203 } else {
2204 return -ENODEV;
2205 }
2206
2207 page = (void *)get_zeroed_page(GFP_KERNEL);
2208 if (!page) {
2209 gvt_err("fail to allocate scratch ggtt page\n");
2210 return -ENOMEM;
2211 }
2212 gvt->gtt.scratch_ggtt_page = virt_to_page(page);
2213
2214 gvt->gtt.scratch_ggtt_mfn = intel_gvt_hypervisor_virt_to_mfn(page);
2215 if (gvt->gtt.scratch_ggtt_mfn == INTEL_GVT_INVALID_ADDR) {
2216 gvt_err("fail to translate scratch ggtt page\n");
2217 __free_page(gvt->gtt.scratch_ggtt_page);
2218 return -EFAULT;
2219 }
2220
2221 if (enable_out_of_sync) {
2222 ret = setup_spt_oos(gvt);
2223 if (ret) {
2224 gvt_err("fail to initialize SPT oos\n");
2225 return ret;
2226 }
2227 }
2228 INIT_LIST_HEAD(&gvt->gtt.mm_lru_list_head);
2229 return 0;
2230}
2231
2232/**
2233 * intel_gvt_clean_gtt - clean up mm components of a GVT device
2234 * @gvt: GVT device
2235 *
2236 * This function is called at the driver unloading stage, to clean up the
2237 * the mm components of a GVT device.
2238 *
2239 */
2240void intel_gvt_clean_gtt(struct intel_gvt *gvt)
2241{
2242 __free_page(gvt->gtt.scratch_ggtt_page);
2243
2244 if (enable_out_of_sync)
2245 clean_spt_oos(gvt);
2246}
2247
2248/**
2249 * intel_vgpu_reset_ggtt - reset the GGTT entry
2250 * @vgpu: a vGPU
2251 *
2252 * This function is called at the vGPU create stage
2253 * to reset all the GGTT entries.
2254 *
2255 */
2256void intel_vgpu_reset_ggtt(struct intel_vgpu *vgpu)
2257{
2258 struct intel_gvt *gvt = vgpu->gvt;
2259 struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
2260 u32 index;
2261 u32 offset;
2262 u32 num_entries;
2263 struct intel_gvt_gtt_entry e;
2264
2265 memset(&e, 0, sizeof(struct intel_gvt_gtt_entry));
2266 e.type = GTT_TYPE_GGTT_PTE;
2267 ops->set_pfn(&e, gvt->gtt.scratch_ggtt_mfn);
2268 e.val64 |= _PAGE_PRESENT;
2269
2270 index = vgpu_aperture_gmadr_base(vgpu) >> PAGE_SHIFT;
2271 num_entries = vgpu_aperture_sz(vgpu) >> PAGE_SHIFT;
2272 for (offset = 0; offset < num_entries; offset++)
2273 ops->set_entry(NULL, &e, index + offset, false, 0, vgpu);
2274
2275 index = vgpu_hidden_gmadr_base(vgpu) >> PAGE_SHIFT;
2276 num_entries = vgpu_hidden_sz(vgpu) >> PAGE_SHIFT;
2277 for (offset = 0; offset < num_entries; offset++)
2278 ops->set_entry(NULL, &e, index + offset, false, 0, vgpu);
2279}
2280
2281/**
2282 * intel_vgpu_reset_gtt - reset the all GTT related status
2283 * @vgpu: a vGPU
2284 * @dmlr: true for vGPU Device Model Level Reset, false for GT Reset
2285 *
2286 * This function is called from vfio core to reset reset all
2287 * GTT related status, including GGTT, PPGTT, scratch page.
2288 *
2289 */
2290void intel_vgpu_reset_gtt(struct intel_vgpu *vgpu, bool dmlr)
2291{
2292 int i;
2293
2294 ppgtt_free_all_shadow_page(vgpu);
2295 if (!dmlr)
2296 return;
2297
2298 intel_vgpu_reset_ggtt(vgpu);
2299
2300 /* clear scratch page for security */
2301 for (i = GTT_TYPE_PPGTT_PTE_PT; i < GTT_TYPE_MAX; i++) {
2302 if (vgpu->gtt.scratch_pt[i].page != NULL)
2303 memset(page_address(vgpu->gtt.scratch_pt[i].page),
2304 0, PAGE_SIZE);
2305 }
2306}