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KVM/MIPS32: MMU/TLB operations for the Guest.
[linux-2.6-block.git] / arch / mips / kvm / kvm_tlb.c
CommitLineData
858dd5d4
SL		 1/*
2* This file is subject to the terms and conditions of the GNU General Public
3* License. See the file "COPYING" in the main directory of this archive
4* for more details.
5*
6* KVM/MIPS TLB handling, this file is part of the Linux host kernel so that
7* TLB handlers run from KSEG0
8*
9* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
10* Authors: Sanjay Lal <sanjayl@kymasys.com>
11*/
12
13#include <linux/init.h>
14#include <linux/sched.h>
15#include <linux/smp.h>
16#include <linux/mm.h>
17#include <linux/delay.h>
18#include <linux/module.h>
19#include <linux/kvm_host.h>
20
21#include <asm/cpu.h>
22#include <asm/bootinfo.h>
23#include <asm/mmu_context.h>
24#include <asm/pgtable.h>
25#include <asm/cacheflush.h>
26
27#undef CONFIG_MIPS_MT
28#include <asm/r4kcache.h>
29#define CONFIG_MIPS_MT
30
31#define KVM_GUEST_PC_TLB 0
32#define KVM_GUEST_SP_TLB 1
33
34#define PRIx64 "llx"
35
36/* Use VZ EntryHi.EHINV to invalidate TLB entries */
37#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
38
39atomic_t kvm_mips_instance;
40EXPORT_SYMBOL(kvm_mips_instance);
41
42/* These function pointers are initialized once the KVM module is loaded */
43pfn_t(*kvm_mips_gfn_to_pfn) (struct kvm *kvm, gfn_t gfn);
44EXPORT_SYMBOL(kvm_mips_gfn_to_pfn);
45
46void (*kvm_mips_release_pfn_clean) (pfn_t pfn);
47EXPORT_SYMBOL(kvm_mips_release_pfn_clean);
48
49bool(*kvm_mips_is_error_pfn) (pfn_t pfn);
50EXPORT_SYMBOL(kvm_mips_is_error_pfn);
51
52uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
53{
54 return vcpu->arch.guest_kernel_asid[smp_processor_id()] & ASID_MASK;
55}
56
57
58uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
59{
60 return vcpu->arch.guest_user_asid[smp_processor_id()] & ASID_MASK;
61}
62
63inline uint32_t kvm_mips_get_commpage_asid (struct kvm_vcpu *vcpu)
64{
65 return vcpu->kvm->arch.commpage_tlb;
66}
67
68
69/*
70 * Structure defining an tlb entry data set.
71 */
72
73void kvm_mips_dump_host_tlbs(void)
74{
75 unsigned long old_entryhi;
76 unsigned long old_pagemask;
77 struct kvm_mips_tlb tlb;
78 unsigned long flags;
79 int i;
80
81 local_irq_save(flags);
82
83 old_entryhi = read_c0_entryhi();
84 old_pagemask = read_c0_pagemask();
85
86 printk("HOST TLBs:\n");
87 printk("ASID: %#lx\n", read_c0_entryhi() & ASID_MASK);
88
89 for (i = 0; i < current_cpu_data.tlbsize; i++) {
90 write_c0_index(i);
91 mtc0_tlbw_hazard();
92
93 tlb_read();
94 tlbw_use_hazard();
95
96 tlb.tlb_hi = read_c0_entryhi();
97 tlb.tlb_lo0 = read_c0_entrylo0();
98 tlb.tlb_lo1 = read_c0_entrylo1();
99 tlb.tlb_mask = read_c0_pagemask();
100
101 printk("TLB%c%3d Hi 0x%08lx ",
102 (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*',
103 i, tlb.tlb_hi);
104 printk("Lo0=0x%09" PRIx64 " %c%c attr %lx ",
105 (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0),
106 (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ',
107 (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ',
108 (tlb.tlb_lo0 >> 3) & 7);
109 printk("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n",
110 (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1),
111 (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ',
112 (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ',
113 (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask);
114 }
115 write_c0_entryhi(old_entryhi);
116 write_c0_pagemask(old_pagemask);
117 mtc0_tlbw_hazard();
118 local_irq_restore(flags);
119}
120
121void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu)
122{
123 struct mips_coproc *cop0 = vcpu->arch.cop0;
124 struct kvm_mips_tlb tlb;
125 int i;
126
127 printk("Guest TLBs:\n");
128 printk("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0));
129
130 for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) {
131 tlb = vcpu->arch.guest_tlb[i];
132 printk("TLB%c%3d Hi 0x%08lx ",
133 (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*',
134 i, tlb.tlb_hi);
135 printk("Lo0=0x%09" PRIx64 " %c%c attr %lx ",
136 (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0),
137 (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ',
138 (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ',
139 (tlb.tlb_lo0 >> 3) & 7);
140 printk("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n",
141 (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1),
142 (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ',
143 (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ',
144 (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask);
145 }
146}
147
148void kvm_mips_dump_shadow_tlbs(struct kvm_vcpu *vcpu)
149{
150 int i;
151 volatile struct kvm_mips_tlb tlb;
152
153 printk("Shadow TLBs:\n");
154 for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) {
155 tlb = vcpu->arch.shadow_tlb[smp_processor_id()][i];
156 printk("TLB%c%3d Hi 0x%08lx ",
157 (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*',
158 i, tlb.tlb_hi);
159 printk("Lo0=0x%09" PRIx64 " %c%c attr %lx ",
160 (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0),
161 (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ',
162 (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ',
163 (tlb.tlb_lo0 >> 3) & 7);
164 printk("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n",
165 (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1),
166 (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ',
167 (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ',
168 (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask);
169 }
170}
171
172static void kvm_mips_map_page(struct kvm *kvm, gfn_t gfn)
173{
174 pfn_t pfn;
175
176 if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE)
177 return;
178
179 pfn = kvm_mips_gfn_to_pfn(kvm, gfn);
180
181 if (kvm_mips_is_error_pfn(pfn)) {
182 panic("Couldn't get pfn for gfn %#" PRIx64 "!\n", gfn);
183 }
184
185 kvm->arch.guest_pmap[gfn] = pfn;
186 return;
187}
188
189/* Translate guest KSEG0 addresses to Host PA */
190unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
191 unsigned long gva)
192{
193 gfn_t gfn;
194 uint32_t offset = gva & ~PAGE_MASK;
195 struct kvm *kvm = vcpu->kvm;
196
197 if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) {
198 kvm_err("%s/%p: Invalid gva: %#lx\n", __func__,
199 __builtin_return_address(0), gva);
200 return KVM_INVALID_PAGE;
201 }
202
203 gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT);
204
205 if (gfn >= kvm->arch.guest_pmap_npages) {
206 kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn,
207 gva);
208 return KVM_INVALID_PAGE;
209 }
210 kvm_mips_map_page(vcpu->kvm, gfn);
211 return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset;
212}
213
214/* XXXKYMA: Must be called with interrupts disabled */
215/* set flush_dcache_mask == 0 if no dcache flush required */
216int
217kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
218 unsigned long entrylo0, unsigned long entrylo1, int flush_dcache_mask)
219{
220 unsigned long flags;
221 unsigned long old_entryhi;
222 volatile int idx;
223
224 local_irq_save(flags);
225
226
227 old_entryhi = read_c0_entryhi();
228 write_c0_entryhi(entryhi);
229 mtc0_tlbw_hazard();
230
231 tlb_probe();
232 tlb_probe_hazard();
233 idx = read_c0_index();
234
235 if (idx > current_cpu_data.tlbsize) {
236 kvm_err("%s: Invalid Index: %d\n", __func__, idx);
237 kvm_mips_dump_host_tlbs();
238 return -1;
239 }
240
241 if (idx < 0) {
242 idx = read_c0_random() % current_cpu_data.tlbsize;
243 write_c0_index(idx);
244 mtc0_tlbw_hazard();
245 }
246 write_c0_entrylo0(entrylo0);
247 write_c0_entrylo1(entrylo1);
248 mtc0_tlbw_hazard();
249
250 tlb_write_indexed();
251 tlbw_use_hazard();
252
253#ifdef DEBUG
254 if (debug) {
255 kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] "
256 "entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n",
257 vcpu->arch.pc, idx, read_c0_entryhi(),
258 read_c0_entrylo0(), read_c0_entrylo1());
259 }
260#endif
261
262 /* Flush D-cache */
263 if (flush_dcache_mask) {
264 if (entrylo0 & MIPS3_PG_V) {
265 ++vcpu->stat.flush_dcache_exits;
266 flush_data_cache_page((entryhi & VPN2_MASK) & ~flush_dcache_mask);
267 }
268 if (entrylo1 & MIPS3_PG_V) {
269 ++vcpu->stat.flush_dcache_exits;
270 flush_data_cache_page(((entryhi & VPN2_MASK) & ~flush_dcache_mask) |
271 (0x1 << PAGE_SHIFT));
272 }
273 }
274
275 /* Restore old ASID */
276 write_c0_entryhi(old_entryhi);
277 mtc0_tlbw_hazard();
278 tlbw_use_hazard();
279 local_irq_restore(flags);
280 return 0;
281}
282
283
284/* XXXKYMA: Must be called with interrupts disabled */
285int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
286 struct kvm_vcpu *vcpu)
287{
288 gfn_t gfn;
289 pfn_t pfn0, pfn1;
290 unsigned long vaddr = 0;
291 unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
292 int even;
293 struct kvm *kvm = vcpu->kvm;
294 const int flush_dcache_mask = 0;
295
296
297 if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) {
298 kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr);
299 kvm_mips_dump_host_tlbs();
300 return -1;
301 }
302
303 gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT);
304 if (gfn >= kvm->arch.guest_pmap_npages) {
305 kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__,
306 gfn, badvaddr);
307 kvm_mips_dump_host_tlbs();
308 return -1;
309 }
310 even = !(gfn & 0x1);
311 vaddr = badvaddr & (PAGE_MASK << 1);
312
313 kvm_mips_map_page(vcpu->kvm, gfn);
314 kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1);
315
316 if (even) {
317 pfn0 = kvm->arch.guest_pmap[gfn];
318 pfn1 = kvm->arch.guest_pmap[gfn ^ 0x1];
319 } else {
320 pfn0 = kvm->arch.guest_pmap[gfn ^ 0x1];
321 pfn1 = kvm->arch.guest_pmap[gfn];
322 }
323
324 entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu));
325 entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | (1 << 2) |
326 (0x1 << 1);
327 entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | (1 << 2) |
328 (0x1 << 1);
329
330 return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
331 flush_dcache_mask);
332}
333
334int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
335 struct kvm_vcpu *vcpu)
336{
337 pfn_t pfn0, pfn1;
338 unsigned long flags, old_entryhi = 0, vaddr = 0;
339 unsigned long entrylo0 = 0, entrylo1 = 0;
340
341
342 pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT;
343 pfn1 = 0;
344 entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | (1 << 2) |
345 (0x1 << 1);
346 entrylo1 = 0;
347
348 local_irq_save(flags);
349
350 old_entryhi = read_c0_entryhi();
351 vaddr = badvaddr & (PAGE_MASK << 1);
352 write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu));
353 mtc0_tlbw_hazard();
354 write_c0_entrylo0(entrylo0);
355 mtc0_tlbw_hazard();
356 write_c0_entrylo1(entrylo1);
357 mtc0_tlbw_hazard();
358 write_c0_index(kvm_mips_get_commpage_asid(vcpu));
359 mtc0_tlbw_hazard();
360 tlb_write_indexed();
361 mtc0_tlbw_hazard();
362 tlbw_use_hazard();
363
364#ifdef DEBUG
365 kvm_debug ("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n",
366 vcpu->arch.pc, read_c0_index(), read_c0_entryhi(),
367 read_c0_entrylo0(), read_c0_entrylo1());
368#endif
369
370 /* Restore old ASID */
371 write_c0_entryhi(old_entryhi);
372 mtc0_tlbw_hazard();
373 tlbw_use_hazard();
374 local_irq_restore(flags);
375
376 return 0;
377}
378
379int
380kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
381 struct kvm_mips_tlb *tlb, unsigned long *hpa0, unsigned long *hpa1)
382{
383 unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
384 struct kvm *kvm = vcpu->kvm;
385 pfn_t pfn0, pfn1;
386
387
388 if ((tlb->tlb_hi & VPN2_MASK) == 0) {
389 pfn0 = 0;
390 pfn1 = 0;
391 } else {
392 kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0) >> PAGE_SHIFT);
393 kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1) >> PAGE_SHIFT);
394
395 pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0) >> PAGE_SHIFT];
396 pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1) >> PAGE_SHIFT];
397 }
398
399 if (hpa0)
400 *hpa0 = pfn0 << PAGE_SHIFT;
401
402 if (hpa1)
403 *hpa1 = pfn1 << PAGE_SHIFT;
404
405 /* Get attributes from the Guest TLB */
406 entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ?
407 kvm_mips_get_kernel_asid(vcpu) : kvm_mips_get_user_asid(vcpu));
408 entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) |
409 (tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V);
410 entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) |
411 (tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V);
412
413#ifdef DEBUG
414 kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
415 tlb->tlb_lo0, tlb->tlb_lo1);
416#endif
417
418 return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
419 tlb->tlb_mask);
420}
421
422int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
423{
424 int i;
425 int index = -1;
426 struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb;
427
428
429 for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) {
430 if (((TLB_VPN2(tlb[i]) & ~tlb[i].tlb_mask) == ((entryhi & VPN2_MASK) & ~tlb[i].tlb_mask)) &&
431 (TLB_IS_GLOBAL(tlb[i]) || (TLB_ASID(tlb[i]) == (entryhi & ASID_MASK)))) {
432 index = i;
433 break;
434 }
435 }
436
437#ifdef DEBUG
438 kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n",
439 __func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1);
440#endif
441
442 return index;
443}
444
445int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr)
446{
447 unsigned long old_entryhi, flags;
448 volatile int idx;
449
450
451 local_irq_save(flags);
452
453 old_entryhi = read_c0_entryhi();
454
455 if (KVM_GUEST_KERNEL_MODE(vcpu))
456 write_c0_entryhi((vaddr & VPN2_MASK) | kvm_mips_get_kernel_asid(vcpu));
457 else {
458 write_c0_entryhi((vaddr & VPN2_MASK) | kvm_mips_get_user_asid(vcpu));
459 }
460
461 mtc0_tlbw_hazard();
462
463 tlb_probe();
464 tlb_probe_hazard();
465 idx = read_c0_index();
466
467 /* Restore old ASID */
468 write_c0_entryhi(old_entryhi);
469 mtc0_tlbw_hazard();
470 tlbw_use_hazard();
471
472 local_irq_restore(flags);
473
474#ifdef DEBUG
475 kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx);
476#endif
477
478 return idx;
479}
480
481int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
482{
483 int idx;
484 unsigned long flags, old_entryhi;
485
486 local_irq_save(flags);
487
488
489 old_entryhi = read_c0_entryhi();
490
491 write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu));
492 mtc0_tlbw_hazard();
493
494 tlb_probe();
495 tlb_probe_hazard();
496 idx = read_c0_index();
497
498 if (idx >= current_cpu_data.tlbsize)
499 BUG();
500
501 if (idx > 0) {
502 write_c0_entryhi(UNIQUE_ENTRYHI(idx));
503 mtc0_tlbw_hazard();
504
505 write_c0_entrylo0(0);
506 mtc0_tlbw_hazard();
507
508 write_c0_entrylo1(0);
509 mtc0_tlbw_hazard();
510
511 tlb_write_indexed();
512 mtc0_tlbw_hazard();
513 }
514
515 write_c0_entryhi(old_entryhi);
516 mtc0_tlbw_hazard();
517 tlbw_use_hazard();
518
519 local_irq_restore(flags);
520
521#ifdef DEBUG
522 if (idx > 0) {
523 kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__,
524 (va & VPN2_MASK) | (vcpu->arch.asid_map[va & ASID_MASK] & ASID_MASK), idx);
525 }
526#endif
527
528 return 0;
529}
530
531/* XXXKYMA: Fix Guest USER/KERNEL no longer share the same ASID*/
532int kvm_mips_host_tlb_inv_index(struct kvm_vcpu *vcpu, int index)
533{
534 unsigned long flags, old_entryhi;
535
536 if (index >= current_cpu_data.tlbsize)
537 BUG();
538
539 local_irq_save(flags);
540
541
542 old_entryhi = read_c0_entryhi();
543
544 write_c0_entryhi(UNIQUE_ENTRYHI(index));
545 mtc0_tlbw_hazard();
546
547 write_c0_index(index);
548 mtc0_tlbw_hazard();
549
550 write_c0_entrylo0(0);
551 mtc0_tlbw_hazard();
552
553 write_c0_entrylo1(0);
554 mtc0_tlbw_hazard();
555
556 tlb_write_indexed();
557 mtc0_tlbw_hazard();
558 tlbw_use_hazard();
559
560 write_c0_entryhi(old_entryhi);
561 mtc0_tlbw_hazard();
562 tlbw_use_hazard();
563
564 local_irq_restore(flags);
565
566 return 0;
567}
568
569void kvm_mips_flush_host_tlb(int skip_kseg0)
570{
571 unsigned long flags;
572 unsigned long old_entryhi, entryhi;
573 unsigned long old_pagemask;
574 int entry = 0;
575 int maxentry = current_cpu_data.tlbsize;
576
577
578 local_irq_save(flags);
579
580 old_entryhi = read_c0_entryhi();
581 old_pagemask = read_c0_pagemask();
582
583 /* Blast 'em all away. */
584 for (entry = 0; entry < maxentry; entry++) {
585
586 write_c0_index(entry);
587 mtc0_tlbw_hazard();
588
589 if (skip_kseg0) {
590 tlb_read();
591 tlbw_use_hazard();
592
593 entryhi = read_c0_entryhi();
594
595 /* Don't blow away guest kernel entries */
596 if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0) {
597 continue;
598 }
599 }
600
601 /* Make sure all entries differ. */
602 write_c0_entryhi(UNIQUE_ENTRYHI(entry));
603 mtc0_tlbw_hazard();
604 write_c0_entrylo0(0);
605 mtc0_tlbw_hazard();
606 write_c0_entrylo1(0);
607 mtc0_tlbw_hazard();
608
609 tlb_write_indexed();
610 mtc0_tlbw_hazard();
611 }
612
613 tlbw_use_hazard();
614
615 write_c0_entryhi(old_entryhi);
616 write_c0_pagemask(old_pagemask);
617 mtc0_tlbw_hazard();
618 tlbw_use_hazard();
619
620 local_irq_restore(flags);
621}
622
623void
624kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
625 struct kvm_vcpu *vcpu)
626{
627 unsigned long asid = asid_cache(cpu);
628
629 if (!((asid += ASID_INC) & ASID_MASK)) {
630 if (cpu_has_vtag_icache) {
631 flush_icache_all();
632 }
633
634 kvm_local_flush_tlb_all(); /* start new asid cycle */
635
636 if (!asid) /* fix version if needed */
637 asid = ASID_FIRST_VERSION;
638 }
639
640 cpu_context(cpu, mm) = asid_cache(cpu) = asid;
641}
642
643void kvm_shadow_tlb_put(struct kvm_vcpu *vcpu)
644{
645 unsigned long flags;
646 unsigned long old_entryhi;
647 unsigned long old_pagemask;
648 int entry = 0;
649 int cpu = smp_processor_id();
650
651 local_irq_save(flags);
652
653 old_entryhi = read_c0_entryhi();
654 old_pagemask = read_c0_pagemask();
655
656 for (entry = 0; entry < current_cpu_data.tlbsize; entry++) {
657 write_c0_index(entry);
658 mtc0_tlbw_hazard();
659 tlb_read();
660 tlbw_use_hazard();
661
662 vcpu->arch.shadow_tlb[cpu][entry].tlb_hi = read_c0_entryhi();
663 vcpu->arch.shadow_tlb[cpu][entry].tlb_lo0 = read_c0_entrylo0();
664 vcpu->arch.shadow_tlb[cpu][entry].tlb_lo1 = read_c0_entrylo1();
665 vcpu->arch.shadow_tlb[cpu][entry].tlb_mask = read_c0_pagemask();
666 }
667
668 write_c0_entryhi(old_entryhi);
669 write_c0_pagemask(old_pagemask);
670 mtc0_tlbw_hazard();
671
672 local_irq_restore(flags);
673
674}
675
676void kvm_shadow_tlb_load(struct kvm_vcpu *vcpu)
677{
678 unsigned long flags;
679 unsigned long old_ctx;
680 int entry;
681 int cpu = smp_processor_id();
682
683 local_irq_save(flags);
684
685 old_ctx = read_c0_entryhi();
686
687 for (entry = 0; entry < current_cpu_data.tlbsize; entry++) {
688 write_c0_entryhi(vcpu->arch.shadow_tlb[cpu][entry].tlb_hi);
689 mtc0_tlbw_hazard();
690 write_c0_entrylo0(vcpu->arch.shadow_tlb[cpu][entry].tlb_lo0);
691 write_c0_entrylo1(vcpu->arch.shadow_tlb[cpu][entry].tlb_lo1);
692
693 write_c0_index(entry);
694 mtc0_tlbw_hazard();
695
696 tlb_write_indexed();
697 tlbw_use_hazard();
698 }
699
700 tlbw_use_hazard();
701 write_c0_entryhi(old_ctx);
702 mtc0_tlbw_hazard();
703 local_irq_restore(flags);
704}
705
706
707void kvm_local_flush_tlb_all(void)
708{
709 unsigned long flags;
710 unsigned long old_ctx;
711 int entry = 0;
712
713 local_irq_save(flags);
714 /* Save old context and create impossible VPN2 value */
715 old_ctx = read_c0_entryhi();
716 write_c0_entrylo0(0);
717 write_c0_entrylo1(0);
718
719 /* Blast 'em all away. */
720 while (entry < current_cpu_data.tlbsize) {
721 /* Make sure all entries differ. */
722 write_c0_entryhi(UNIQUE_ENTRYHI(entry));
723 write_c0_index(entry);
724 mtc0_tlbw_hazard();
725 tlb_write_indexed();
726 entry++;
727 }
728 tlbw_use_hazard();
729 write_c0_entryhi(old_ctx);
730 mtc0_tlbw_hazard();
731
732 local_irq_restore(flags);
733}
734
735void kvm_mips_init_shadow_tlb(struct kvm_vcpu *vcpu)
736{
737 int cpu, entry;
738
739 for_each_possible_cpu(cpu) {
740 for (entry = 0; entry < current_cpu_data.tlbsize; entry++) {
741 vcpu->arch.shadow_tlb[cpu][entry].tlb_hi =
742 UNIQUE_ENTRYHI(entry);
743 vcpu->arch.shadow_tlb[cpu][entry].tlb_lo0 = 0x0;
744 vcpu->arch.shadow_tlb[cpu][entry].tlb_lo1 = 0x0;
745 vcpu->arch.shadow_tlb[cpu][entry].tlb_mask =
746 read_c0_pagemask();
747#ifdef DEBUG
748 kvm_debug
749 ("shadow_tlb[%d][%d]: tlb_hi: %#lx, lo0: %#lx, lo1: %#lx\n",
750 cpu, entry,
751 vcpu->arch.shadow_tlb[cpu][entry].tlb_hi,
752 vcpu->arch.shadow_tlb[cpu][entry].tlb_lo0,
753 vcpu->arch.shadow_tlb[cpu][entry].tlb_lo1);
754#endif
755 }
756 }
757}
758
759/* Restore ASID once we are scheduled back after preemption */
760void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
761{
762 unsigned long flags;
763 int newasid = 0;
764
765#ifdef DEBUG
766 kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu);
767#endif
768
769 /* Alocate new kernel and user ASIDs if needed */
770
771 local_irq_save(flags);
772
773 if (((vcpu->arch.
774 guest_kernel_asid[cpu] ^ asid_cache(cpu)) & ASID_VERSION_MASK)) {
775 kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu);
776 vcpu->arch.guest_kernel_asid[cpu] =
777 vcpu->arch.guest_kernel_mm.context.asid[cpu];
778 kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu);
779 vcpu->arch.guest_user_asid[cpu] =
780 vcpu->arch.guest_user_mm.context.asid[cpu];
781 newasid++;
782
783 kvm_info("[%d]: cpu_context: %#lx\n", cpu,
784 cpu_context(cpu, current->mm));
785 kvm_info("[%d]: Allocated new ASID for Guest Kernel: %#x\n",
786 cpu, vcpu->arch.guest_kernel_asid[cpu]);
787 kvm_info("[%d]: Allocated new ASID for Guest User: %#x\n", cpu,
788 vcpu->arch.guest_user_asid[cpu]);
789 }
790
791 if (vcpu->arch.last_sched_cpu != cpu) {
792 kvm_info("[%d->%d]KVM VCPU[%d] switch\n",
793 vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
794 }
795
796 /* Only reload shadow host TLB if new ASIDs haven't been allocated */
797#if 0
798 if ((atomic_read(&kvm_mips_instance) > 1) && !newasid) {
799 kvm_mips_flush_host_tlb(0);
800 kvm_shadow_tlb_load(vcpu);
801 }
802#endif
803
804 if (!newasid) {
805 /* If we preempted while the guest was executing, then reload the pre-empted ASID */
806 if (current->flags & PF_VCPU) {
807 write_c0_entryhi(vcpu->arch.
808 preempt_entryhi & ASID_MASK);
809 ehb();
810 }
811 } else {
812 /* New ASIDs were allocated for the VM */
813
814 /* Were we in guest context? If so then the pre-empted ASID is no longer
815 * valid, we need to set it to what it should be based on the mode of
816 * the Guest (Kernel/User)
817 */
818 if (current->flags & PF_VCPU) {
819 if (KVM_GUEST_KERNEL_MODE(vcpu))
820 write_c0_entryhi(vcpu->arch.
821 guest_kernel_asid[cpu] &
822 ASID_MASK);
823 else
824 write_c0_entryhi(vcpu->arch.
825 guest_user_asid[cpu] &
826 ASID_MASK);
827 ehb();
828 }
829 }
830
831 local_irq_restore(flags);
832
833}
834
835/* ASID can change if another task is scheduled during preemption */
836void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
837{
838 unsigned long flags;
839 uint32_t cpu;
840
841 local_irq_save(flags);
842
843 cpu = smp_processor_id();
844
845
846 vcpu->arch.preempt_entryhi = read_c0_entryhi();
847 vcpu->arch.last_sched_cpu = cpu;
848
849#if 0
850 if ((atomic_read(&kvm_mips_instance) > 1)) {
851 kvm_shadow_tlb_put(vcpu);
852 }
853#endif
854
855 if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
856 ASID_VERSION_MASK)) {
857 kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__,
858 cpu_context(cpu, current->mm));
859 drop_mmu_context(current->mm, cpu);
860 }
861 write_c0_entryhi(cpu_asid(cpu, current->mm));
862 ehb();
863
864 local_irq_restore(flags);
865}
866
867uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu)
868{
869 struct mips_coproc *cop0 = vcpu->arch.cop0;
870 unsigned long paddr, flags;
871 uint32_t inst;
872 int index;
873
874 if (KVM_GUEST_KSEGX((unsigned long) opc) < KVM_GUEST_KSEG0 ||
875 KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
876 local_irq_save(flags);
877 index = kvm_mips_host_tlb_lookup(vcpu, (unsigned long) opc);
878 if (index >= 0) {
879 inst = *(opc);
880 } else {
881 index =
882 kvm_mips_guest_tlb_lookup(vcpu,
883 ((unsigned long) opc & VPN2_MASK)
884 |
885 (kvm_read_c0_guest_entryhi
886 (cop0) & ASID_MASK));
887 if (index < 0) {
888 kvm_err
889 ("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n",
890 __func__, opc, vcpu, read_c0_entryhi());
891 kvm_mips_dump_host_tlbs();
892 local_irq_restore(flags);
893 return KVM_INVALID_INST;
894 }
895 kvm_mips_handle_mapped_seg_tlb_fault(vcpu,
896 &vcpu->arch.
897 guest_tlb[index],
898 NULL, NULL);
899 inst = *(opc);
900 }
901 local_irq_restore(flags);
902 } else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
903 paddr =
904 kvm_mips_translate_guest_kseg0_to_hpa(vcpu,
905 (unsigned long) opc);
906 inst = *(uint32_t *) CKSEG0ADDR(paddr);
907 } else {
908 kvm_err("%s: illegal address: %p\n", __func__, opc);
909 return KVM_INVALID_INST;
910 }
911
912 return inst;
913}
914
915EXPORT_SYMBOL(kvm_local_flush_tlb_all);
916EXPORT_SYMBOL(kvm_shadow_tlb_put);
917EXPORT_SYMBOL(kvm_mips_handle_mapped_seg_tlb_fault);
918EXPORT_SYMBOL(kvm_mips_handle_commpage_tlb_fault);
919EXPORT_SYMBOL(kvm_mips_init_shadow_tlb);
920EXPORT_SYMBOL(kvm_mips_dump_host_tlbs);
921EXPORT_SYMBOL(kvm_mips_handle_kseg0_tlb_fault);
922EXPORT_SYMBOL(kvm_mips_host_tlb_lookup);
923EXPORT_SYMBOL(kvm_mips_flush_host_tlb);
924EXPORT_SYMBOL(kvm_mips_guest_tlb_lookup);
925EXPORT_SYMBOL(kvm_mips_host_tlb_inv);
926EXPORT_SYMBOL(kvm_mips_translate_guest_kseg0_to_hpa);
927EXPORT_SYMBOL(kvm_shadow_tlb_load);
928EXPORT_SYMBOL(kvm_mips_dump_shadow_tlbs);
929EXPORT_SYMBOL(kvm_mips_dump_guest_tlbs);
930EXPORT_SYMBOL(kvm_get_inst);
931EXPORT_SYMBOL(kvm_arch_vcpu_load);
932EXPORT_SYMBOL(kvm_arch_vcpu_put);
Linux 6.x block layer and io_uring tree(s)