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KVM: PPC: e500: Silence bogus GCC warning in tlb code
[linux-2.6/btrfs-unstable.git] / arch / powerpc / kvm / e500_tlb.c
blob5532bfb15464b3a1a84fe4cac8594af8947dc1a8
1 /*
2 * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
3 *
4 * Author: Yu Liu, yu.liu@freescale.com
5 * Scott Wood, scottwood@freescale.com
6 * Ashish Kalra, ashish.kalra@freescale.com
7 * Varun Sethi, varun.sethi@freescale.com
8 *
9 * Description:
10 * This file is based on arch/powerpc/kvm/44x_tlb.c,
11 * by Hollis Blanchard <hollisb@us.ibm.com>.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License, version 2, as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/types.h>
20 #include <linux/slab.h>
21 #include <linux/string.h>
22 #include <linux/kvm.h>
23 #include <linux/kvm_host.h>
24 #include <linux/highmem.h>
25 #include <linux/log2.h>
26 #include <linux/uaccess.h>
27 #include <linux/sched.h>
28 #include <linux/rwsem.h>
29 #include <linux/vmalloc.h>
30 #include <linux/hugetlb.h>
31 #include <asm/kvm_ppc.h>
32
33 #include "e500.h"
34 #include "trace.h"
35 #include "timing.h"
36
37 #define to_htlb1_esel(esel) (host_tlb_params[1].entries - (esel) - 1)
38
39 static struct kvmppc_e500_tlb_params host_tlb_params[E500_TLB_NUM];
40
41 static inline unsigned int gtlb0_get_next_victim(
42 struct kvmppc_vcpu_e500 *vcpu_e500)
43 {
44 unsigned int victim;
45
46 victim = vcpu_e500->gtlb_nv[0]++;
47 if (unlikely(vcpu_e500->gtlb_nv[0] >= vcpu_e500->gtlb_params[0].ways))
48 vcpu_e500->gtlb_nv[0] = 0;
49
50 return victim;
51 }
52
53 static inline unsigned int tlb1_max_shadow_size(void)
54 {
55 /* reserve one entry for magic page */
56 return host_tlb_params[1].entries - tlbcam_index - 1;
57 }
58
59 static inline int tlbe_is_writable(struct kvm_book3e_206_tlb_entry *tlbe)
60 {
61 return tlbe->mas7_3 & (MAS3_SW|MAS3_UW);
62 }
63
64 static inline u32 e500_shadow_mas3_attrib(u32 mas3, int usermode)
65 {
66 /* Mask off reserved bits. */
67 mas3 &= MAS3_ATTRIB_MASK;
68
69 #ifndef CONFIG_KVM_BOOKE_HV
70 if (!usermode) {
71 /* Guest is in supervisor mode,
72 * so we need to translate guest
73 * supervisor permissions into user permissions. */
74 mas3 &= ~E500_TLB_USER_PERM_MASK;
75 mas3 |= (mas3 & E500_TLB_SUPER_PERM_MASK) << 1;
76 }
77 mas3 |= E500_TLB_SUPER_PERM_MASK;
78 #endif
79 return mas3;
80 }
81
82 static inline u32 e500_shadow_mas2_attrib(u32 mas2, int usermode)
83 {
84 #ifdef CONFIG_SMP
85 return (mas2 & MAS2_ATTRIB_MASK) | MAS2_M;
86 #else
87 return mas2 & MAS2_ATTRIB_MASK;
88 #endif
89 }
90
91 /*
92 * writing shadow tlb entry to host TLB
93 */
94 static inline void __write_host_tlbe(struct kvm_book3e_206_tlb_entry *stlbe,
95 uint32_t mas0)
96 {
97 unsigned long flags;
98
99 local_irq_save(flags);
100 mtspr(SPRN_MAS0, mas0);
101 mtspr(SPRN_MAS1, stlbe->mas1);
102 mtspr(SPRN_MAS2, (unsigned long)stlbe->mas2);
103 mtspr(SPRN_MAS3, (u32)stlbe->mas7_3);
104 mtspr(SPRN_MAS7, (u32)(stlbe->mas7_3 >> 32));
105 #ifdef CONFIG_KVM_BOOKE_HV
106 mtspr(SPRN_MAS8, stlbe->mas8);
107 #endif
108 asm volatile("isync; tlbwe" : : : "memory");
109
110 #ifdef CONFIG_KVM_BOOKE_HV
111 /* Must clear mas8 for other host tlbwe's */
112 mtspr(SPRN_MAS8, 0);
113 isync();
114 #endif
115 local_irq_restore(flags);
116
117 trace_kvm_booke206_stlb_write(mas0, stlbe->mas8, stlbe->mas1,
118 stlbe->mas2, stlbe->mas7_3);
119 }
120
121 /*
122 * Acquire a mas0 with victim hint, as if we just took a TLB miss.
123 *
124 * We don't care about the address we're searching for, other than that it's
125 * in the right set and is not present in the TLB. Using a zero PID and a
126 * userspace address means we don't have to set and then restore MAS5, or
127 * calculate a proper MAS6 value.
128 */
129 static u32 get_host_mas0(unsigned long eaddr)
130 {
131 unsigned long flags;
132 u32 mas0;
133
134 local_irq_save(flags);
135 mtspr(SPRN_MAS6, 0);
136 asm volatile("tlbsx 0, %0" : : "b" (eaddr & ~CONFIG_PAGE_OFFSET));
137 mas0 = mfspr(SPRN_MAS0);
138 local_irq_restore(flags);
139
140 return mas0;
141 }
142
143 /* sesel is for tlb1 only */
144 static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
145 int tlbsel, int sesel, struct kvm_book3e_206_tlb_entry *stlbe)
146 {
147 u32 mas0;
148
149 if (tlbsel == 0) {
150 mas0 = get_host_mas0(stlbe->mas2);
151 __write_host_tlbe(stlbe, mas0);
152 } else {
153 __write_host_tlbe(stlbe,
154 MAS0_TLBSEL(1) |
155 MAS0_ESEL(to_htlb1_esel(sesel)));
156 }
157 }
158
159 #ifdef CONFIG_KVM_E500V2
160 void kvmppc_map_magic(struct kvm_vcpu *vcpu)
161 {
162 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
163 struct kvm_book3e_206_tlb_entry magic;
164 ulong shared_page = ((ulong)vcpu->arch.shared) & PAGE_MASK;
165 unsigned int stid;
166 pfn_t pfn;
167
168 pfn = (pfn_t)virt_to_phys((void *)shared_page) >> PAGE_SHIFT;
169 get_page(pfn_to_page(pfn));
170
171 preempt_disable();
172 stid = kvmppc_e500_get_sid(vcpu_e500, 0, 0, 0, 0);
173
174 magic.mas1 = MAS1_VALID | MAS1_TS | MAS1_TID(stid) |
175 MAS1_TSIZE(BOOK3E_PAGESZ_4K);
176 magic.mas2 = vcpu->arch.magic_page_ea | MAS2_M;
177 magic.mas7_3 = ((u64)pfn << PAGE_SHIFT) |
178 MAS3_SW | MAS3_SR | MAS3_UW | MAS3_UR;
179 magic.mas8 = 0;
180
181 __write_host_tlbe(&magic, MAS0_TLBSEL(1) | MAS0_ESEL(tlbcam_index));
182 preempt_enable();
183 }
184 #endif
185
186 static void inval_gtlbe_on_host(struct kvmppc_vcpu_e500 *vcpu_e500,
187 int tlbsel, int esel)
188 {
189 struct kvm_book3e_206_tlb_entry *gtlbe =
190 get_entry(vcpu_e500, tlbsel, esel);
191
192 if (tlbsel == 1 &&
193 vcpu_e500->gtlb_priv[1][esel].ref.flags & E500_TLB_BITMAP) {
194 u64 tmp = vcpu_e500->g2h_tlb1_map[esel];
195 int hw_tlb_indx;
196 unsigned long flags;
197
198 local_irq_save(flags);
199 while (tmp) {
200 hw_tlb_indx = __ilog2_u64(tmp & -tmp);
201 mtspr(SPRN_MAS0,
202 MAS0_TLBSEL(1) |
203 MAS0_ESEL(to_htlb1_esel(hw_tlb_indx)));
204 mtspr(SPRN_MAS1, 0);
205 asm volatile("tlbwe");
206 vcpu_e500->h2g_tlb1_rmap[hw_tlb_indx] = 0;
207 tmp &= tmp - 1;
208 }
209 mb();
210 vcpu_e500->g2h_tlb1_map[esel] = 0;
211 vcpu_e500->gtlb_priv[1][esel].ref.flags &= ~E500_TLB_BITMAP;
212 local_irq_restore(flags);
213
214 return;
215 }
216
217 /* Guest tlbe is backed by at most one host tlbe per shadow pid. */
218 kvmppc_e500_tlbil_one(vcpu_e500, gtlbe);
219 }
220
221 static int tlb0_set_base(gva_t addr, int sets, int ways)
222 {
223 int set_base;
224
225 set_base = (addr >> PAGE_SHIFT) & (sets - 1);
226 set_base *= ways;
227
228 return set_base;
229 }
230
231 static int gtlb0_set_base(struct kvmppc_vcpu_e500 *vcpu_e500, gva_t addr)
232 {
233 return tlb0_set_base(addr, vcpu_e500->gtlb_params[0].sets,
234 vcpu_e500->gtlb_params[0].ways);
235 }
236
237 static unsigned int get_tlb_esel(struct kvm_vcpu *vcpu, int tlbsel)
238 {
239 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
240 int esel = get_tlb_esel_bit(vcpu);
241
242 if (tlbsel == 0) {
243 esel &= vcpu_e500->gtlb_params[0].ways - 1;
244 esel += gtlb0_set_base(vcpu_e500, vcpu->arch.shared->mas2);
245 } else {
246 esel &= vcpu_e500->gtlb_params[tlbsel].entries - 1;
247 }
248
249 return esel;
250 }
251
252 /* Search the guest TLB for a matching entry. */
253 static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500,
254 gva_t eaddr, int tlbsel, unsigned int pid, int as)
255 {
256 int size = vcpu_e500->gtlb_params[tlbsel].entries;
257 unsigned int set_base, offset;
258 int i;
259
260 if (tlbsel == 0) {
261 set_base = gtlb0_set_base(vcpu_e500, eaddr);
262 size = vcpu_e500->gtlb_params[0].ways;
263 } else {
264 if (eaddr < vcpu_e500->tlb1_min_eaddr ||
265 eaddr > vcpu_e500->tlb1_max_eaddr)
266 return -1;
267 set_base = 0;
268 }
269
270 offset = vcpu_e500->gtlb_offset[tlbsel];
271
272 for (i = 0; i < size; i++) {
273 struct kvm_book3e_206_tlb_entry *tlbe =
274 &vcpu_e500->gtlb_arch[offset + set_base + i];
275 unsigned int tid;
276
277 if (eaddr < get_tlb_eaddr(tlbe))
278 continue;
279
280 if (eaddr > get_tlb_end(tlbe))
281 continue;
282
283 tid = get_tlb_tid(tlbe);
284 if (tid && (tid != pid))
285 continue;
286
287 if (!get_tlb_v(tlbe))
288 continue;
289
290 if (get_tlb_ts(tlbe) != as && as != -1)
291 continue;
292
293 return set_base + i;
294 }
295
296 return -1;
297 }
298
299 static inline void kvmppc_e500_ref_setup(struct tlbe_ref *ref,
300 struct kvm_book3e_206_tlb_entry *gtlbe,
301 pfn_t pfn)
302 {
303 ref->pfn = pfn;
304 ref->flags = E500_TLB_VALID;
305
306 if (tlbe_is_writable(gtlbe))
307 kvm_set_pfn_dirty(pfn);
308 }
309
310 static inline void kvmppc_e500_ref_release(struct tlbe_ref *ref)
311 {
312 if (ref->flags & E500_TLB_VALID) {
313 trace_kvm_booke206_ref_release(ref->pfn, ref->flags);
314 ref->flags = 0;
315 }
316 }
317
318 static void clear_tlb1_bitmap(struct kvmppc_vcpu_e500 *vcpu_e500)
319 {
320 if (vcpu_e500->g2h_tlb1_map)
321 memset(vcpu_e500->g2h_tlb1_map, 0,
322 sizeof(u64) * vcpu_e500->gtlb_params[1].entries);
323 if (vcpu_e500->h2g_tlb1_rmap)
324 memset(vcpu_e500->h2g_tlb1_rmap, 0,
325 sizeof(unsigned int) * host_tlb_params[1].entries);
326 }
327
328 static void clear_tlb_privs(struct kvmppc_vcpu_e500 *vcpu_e500)
329 {
330 int tlbsel = 0;
331 int i;
332
333 for (i = 0; i < vcpu_e500->gtlb_params[tlbsel].entries; i++) {
334 struct tlbe_ref *ref =
335 &vcpu_e500->gtlb_priv[tlbsel][i].ref;
336 kvmppc_e500_ref_release(ref);
337 }
338 }
339
340 static void clear_tlb_refs(struct kvmppc_vcpu_e500 *vcpu_e500)
341 {
342 int stlbsel = 1;
343 int i;
344
345 kvmppc_e500_tlbil_all(vcpu_e500);
346
347 for (i = 0; i < host_tlb_params[stlbsel].entries; i++) {
348 struct tlbe_ref *ref =
349 &vcpu_e500->tlb_refs[stlbsel][i];
350 kvmppc_e500_ref_release(ref);
351 }
352
353 clear_tlb_privs(vcpu_e500);
354 }
355
356 void kvmppc_core_flush_tlb(struct kvm_vcpu *vcpu)
357 {
358 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
359 clear_tlb_refs(vcpu_e500);
360 clear_tlb1_bitmap(vcpu_e500);
361 }
362
363 static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu,
364 unsigned int eaddr, int as)
365 {
366 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
367 unsigned int victim, tsized;
368 int tlbsel;
369
370 /* since we only have two TLBs, only lower bit is used. */
371 tlbsel = (vcpu->arch.shared->mas4 >> 28) & 0x1;
372 victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
373 tsized = (vcpu->arch.shared->mas4 >> 7) & 0x1f;
374
375 vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
376 | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
377 vcpu->arch.shared->mas1 = MAS1_VALID | (as ? MAS1_TS : 0)
378 | MAS1_TID(get_tlbmiss_tid(vcpu))
379 | MAS1_TSIZE(tsized);
380 vcpu->arch.shared->mas2 = (eaddr & MAS2_EPN)
381 | (vcpu->arch.shared->mas4 & MAS2_ATTRIB_MASK);
382 vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
383 vcpu->arch.shared->mas6 = (vcpu->arch.shared->mas6 & MAS6_SPID1)
384 | (get_cur_pid(vcpu) << 16)
385 | (as ? MAS6_SAS : 0);
386 }
387
388 /* TID must be supplied by the caller */
389 static inline void kvmppc_e500_setup_stlbe(
390 struct kvm_vcpu *vcpu,
391 struct kvm_book3e_206_tlb_entry *gtlbe,
392 int tsize, struct tlbe_ref *ref, u64 gvaddr,
393 struct kvm_book3e_206_tlb_entry *stlbe)
394 {
395 pfn_t pfn = ref->pfn;
396 u32 pr = vcpu->arch.shared->msr & MSR_PR;
397
398 BUG_ON(!(ref->flags & E500_TLB_VALID));
399
400 /* Force IPROT=0 for all guest mappings. */
401 stlbe->mas1 = MAS1_TSIZE(tsize) | get_tlb_sts(gtlbe) | MAS1_VALID;
402 stlbe->mas2 = (gvaddr & MAS2_EPN) |
403 e500_shadow_mas2_attrib(gtlbe->mas2, pr);
404 stlbe->mas7_3 = ((u64)pfn << PAGE_SHIFT) |
405 e500_shadow_mas3_attrib(gtlbe->mas7_3, pr);
406
407 #ifdef CONFIG_KVM_BOOKE_HV
408 stlbe->mas8 = MAS8_TGS | vcpu->kvm->arch.lpid;
409 #endif
410 }
411
412 static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
413 u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe,
414 int tlbsel, struct kvm_book3e_206_tlb_entry *stlbe,
415 struct tlbe_ref *ref)
416 {
417 struct kvm_memory_slot *slot;
418 unsigned long pfn = 0; /* silence GCC warning */
419 unsigned long hva;
420 int pfnmap = 0;
421 int tsize = BOOK3E_PAGESZ_4K;
422
423 /*
424 * Translate guest physical to true physical, acquiring
425 * a page reference if it is normal, non-reserved memory.
426 *
427 * gfn_to_memslot() must succeed because otherwise we wouldn't
428 * have gotten this far. Eventually we should just pass the slot
429 * pointer through from the first lookup.
430 */
431 slot = gfn_to_memslot(vcpu_e500->vcpu.kvm, gfn);
432 hva = gfn_to_hva_memslot(slot, gfn);
433
434 if (tlbsel == 1) {
435 struct vm_area_struct *vma;
436 down_read(&current->mm->mmap_sem);
437
438 vma = find_vma(current->mm, hva);
439 if (vma && hva >= vma->vm_start &&
440 (vma->vm_flags & VM_PFNMAP)) {
441 /*
442 * This VMA is a physically contiguous region (e.g.
443 * /dev/mem) that bypasses normal Linux page
444 * management. Find the overlap between the
445 * vma and the memslot.
446 */
447
448 unsigned long start, end;
449 unsigned long slot_start, slot_end;
450
451 pfnmap = 1;
452
453 start = vma->vm_pgoff;
454 end = start +
455 ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
456
457 pfn = start + ((hva - vma->vm_start) >> PAGE_SHIFT);
458
459 slot_start = pfn - (gfn - slot->base_gfn);
460 slot_end = slot_start + slot->npages;
461
462 if (start < slot_start)
463 start = slot_start;
464 if (end > slot_end)
465 end = slot_end;
466
467 tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >>
468 MAS1_TSIZE_SHIFT;
469
470 /*
471 * e500 doesn't implement the lowest tsize bit,
472 * or 1K pages.
473 */
474 tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1);
475
476 /*
477 * Now find the largest tsize (up to what the guest
478 * requested) that will cover gfn, stay within the
479 * range, and for which gfn and pfn are mutually
480 * aligned.
481 */
482
483 for (; tsize > BOOK3E_PAGESZ_4K; tsize -= 2) {
484 unsigned long gfn_start, gfn_end, tsize_pages;
485 tsize_pages = 1 << (tsize - 2);
486
487 gfn_start = gfn & ~(tsize_pages - 1);
488 gfn_end = gfn_start + tsize_pages;
489
490 if (gfn_start + pfn - gfn < start)
491 continue;
492 if (gfn_end + pfn - gfn > end)
493 continue;
494 if ((gfn & (tsize_pages - 1)) !=
495 (pfn & (tsize_pages - 1)))
496 continue;
497
498 gvaddr &= ~((tsize_pages << PAGE_SHIFT) - 1);
499 pfn &= ~(tsize_pages - 1);
500 break;
501 }
502 } else if (vma && hva >= vma->vm_start &&
503 (vma->vm_flags & VM_HUGETLB)) {
504 unsigned long psize = vma_kernel_pagesize(vma);
505
506 tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >>
507 MAS1_TSIZE_SHIFT;
508
509 /*
510 * Take the largest page size that satisfies both host
511 * and guest mapping
512 */
513 tsize = min(__ilog2(psize) - 10, tsize);
514
515 /*
516 * e500 doesn't implement the lowest tsize bit,
517 * or 1K pages.
518 */
519 tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1);
520 }
521
522 up_read(&current->mm->mmap_sem);
523 }
524
525 if (likely(!pfnmap)) {
526 unsigned long tsize_pages = 1 << (tsize + 10 - PAGE_SHIFT);
527 pfn = gfn_to_pfn_memslot(slot, gfn);
528 if (is_error_noslot_pfn(pfn)) {
529 printk(KERN_ERR "Couldn't get real page for gfn %lx!\n",
530 (long)gfn);
531 return;
532 }
533
534 /* Align guest and physical address to page map boundaries */
535 pfn &= ~(tsize_pages - 1);
536 gvaddr &= ~((tsize_pages << PAGE_SHIFT) - 1);
537 }
538
539 /* Drop old ref and setup new one. */
540 kvmppc_e500_ref_release(ref);
541 kvmppc_e500_ref_setup(ref, gtlbe, pfn);
542
543 kvmppc_e500_setup_stlbe(&vcpu_e500->vcpu, gtlbe, tsize,
544 ref, gvaddr, stlbe);
545
546 /* Clear i-cache for new pages */
547 kvmppc_mmu_flush_icache(pfn);
548
549 /* Drop refcount on page, so that mmu notifiers can clear it */
550 kvm_release_pfn_clean(pfn);
551 }
552
553 /* XXX only map the one-one case, for now use TLB0 */
554 static void kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500,
555 int esel,
556 struct kvm_book3e_206_tlb_entry *stlbe)
557 {
558 struct kvm_book3e_206_tlb_entry *gtlbe;
559 struct tlbe_ref *ref;
560
561 gtlbe = get_entry(vcpu_e500, 0, esel);
562 ref = &vcpu_e500->gtlb_priv[0][esel].ref;
563
564 kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe),
565 get_tlb_raddr(gtlbe) >> PAGE_SHIFT,
566 gtlbe, 0, stlbe, ref);
567 }
568
569 /* Caller must ensure that the specified guest TLB entry is safe to insert into
570 * the shadow TLB. */
571 /* XXX for both one-one and one-to-many , for now use TLB1 */
572 static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500,
573 u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe,
574 struct kvm_book3e_206_tlb_entry *stlbe, int esel)
575 {
576 struct tlbe_ref *ref;
577 unsigned int victim;
578
579 victim = vcpu_e500->host_tlb1_nv++;
580
581 if (unlikely(vcpu_e500->host_tlb1_nv >= tlb1_max_shadow_size()))
582 vcpu_e500->host_tlb1_nv = 0;
583
584 ref = &vcpu_e500->tlb_refs[1][victim];
585 kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, stlbe, ref);
586
587 vcpu_e500->g2h_tlb1_map[esel] |= (u64)1 << victim;
588 vcpu_e500->gtlb_priv[1][esel].ref.flags |= E500_TLB_BITMAP;
589 if (vcpu_e500->h2g_tlb1_rmap[victim]) {
590 unsigned int idx = vcpu_e500->h2g_tlb1_rmap[victim];
591 vcpu_e500->g2h_tlb1_map[idx] &= ~(1ULL << victim);
592 }
593 vcpu_e500->h2g_tlb1_rmap[victim] = esel;
594
595 return victim;
596 }
597
598 static void kvmppc_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500)
599 {
600 int size = vcpu_e500->gtlb_params[1].entries;
601 unsigned int offset;
602 gva_t eaddr;
603 int i;
604
605 vcpu_e500->tlb1_min_eaddr = ~0UL;
606 vcpu_e500->tlb1_max_eaddr = 0;
607 offset = vcpu_e500->gtlb_offset[1];
608
609 for (i = 0; i < size; i++) {
610 struct kvm_book3e_206_tlb_entry *tlbe =
611 &vcpu_e500->gtlb_arch[offset + i];
612
613 if (!get_tlb_v(tlbe))
614 continue;
615
616 eaddr = get_tlb_eaddr(tlbe);
617 vcpu_e500->tlb1_min_eaddr =
618 min(vcpu_e500->tlb1_min_eaddr, eaddr);
619
620 eaddr = get_tlb_end(tlbe);
621 vcpu_e500->tlb1_max_eaddr =
622 max(vcpu_e500->tlb1_max_eaddr, eaddr);
623 }
624 }
625
626 static int kvmppc_need_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500,
627 struct kvm_book3e_206_tlb_entry *gtlbe)
628 {
629 unsigned long start, end, size;
630
631 size = get_tlb_bytes(gtlbe);
632 start = get_tlb_eaddr(gtlbe) & ~(size - 1);
633 end = start + size - 1;
634
635 return vcpu_e500->tlb1_min_eaddr == start ||
636 vcpu_e500->tlb1_max_eaddr == end;
637 }
638
639 /* This function is supposed to be called for a adding a new valid tlb entry */
640 static void kvmppc_set_tlb1map_range(struct kvm_vcpu *vcpu,
641 struct kvm_book3e_206_tlb_entry *gtlbe)
642 {
643 unsigned long start, end, size;
644 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
645
646 if (!get_tlb_v(gtlbe))
647 return;
648
649 size = get_tlb_bytes(gtlbe);
650 start = get_tlb_eaddr(gtlbe) & ~(size - 1);
651 end = start + size - 1;
652
653 vcpu_e500->tlb1_min_eaddr = min(vcpu_e500->tlb1_min_eaddr, start);
654 vcpu_e500->tlb1_max_eaddr = max(vcpu_e500->tlb1_max_eaddr, end);
655 }
656
657 static inline int kvmppc_e500_gtlbe_invalidate(
658 struct kvmppc_vcpu_e500 *vcpu_e500,
659 int tlbsel, int esel)
660 {
661 struct kvm_book3e_206_tlb_entry *gtlbe =
662 get_entry(vcpu_e500, tlbsel, esel);
663
664 if (unlikely(get_tlb_iprot(gtlbe)))
665 return -1;
666
667 if (tlbsel == 1 && kvmppc_need_recalc_tlb1map_range(vcpu_e500, gtlbe))
668 kvmppc_recalc_tlb1map_range(vcpu_e500);
669
670 gtlbe->mas1 = 0;
671
672 return 0;
673 }
674
675 int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500, ulong value)
676 {
677 int esel;
678
679 if (value & MMUCSR0_TLB0FI)
680 for (esel = 0; esel < vcpu_e500->gtlb_params[0].entries; esel++)
681 kvmppc_e500_gtlbe_invalidate(vcpu_e500, 0, esel);
682 if (value & MMUCSR0_TLB1FI)
683 for (esel = 0; esel < vcpu_e500->gtlb_params[1].entries; esel++)
684 kvmppc_e500_gtlbe_invalidate(vcpu_e500, 1, esel);
685
686 /* Invalidate all vcpu id mappings */
687 kvmppc_e500_tlbil_all(vcpu_e500);
688
689 return EMULATE_DONE;
690 }
691
692 int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, int ra, int rb)
693 {
694 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
695 unsigned int ia;
696 int esel, tlbsel;
697 gva_t ea;
698
699 ea = ((ra) ? kvmppc_get_gpr(vcpu, ra) : 0) + kvmppc_get_gpr(vcpu, rb);
700
701 ia = (ea >> 2) & 0x1;
702
703 /* since we only have two TLBs, only lower bit is used. */
704 tlbsel = (ea >> 3) & 0x1;
705
706 if (ia) {
707 /* invalidate all entries */
708 for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries;
709 esel++)
710 kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
711 } else {
712 ea &= 0xfffff000;
713 esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel,
714 get_cur_pid(vcpu), -1);
715 if (esel >= 0)
716 kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
717 }
718
719 /* Invalidate all vcpu id mappings */
720 kvmppc_e500_tlbil_all(vcpu_e500);
721
722 return EMULATE_DONE;
723 }
724
725 static void tlbilx_all(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel,
726 int pid, int rt)
727 {
728 struct kvm_book3e_206_tlb_entry *tlbe;
729 int tid, esel;
730
731 /* invalidate all entries */
732 for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries; esel++) {
733 tlbe = get_entry(vcpu_e500, tlbsel, esel);
734 tid = get_tlb_tid(tlbe);
735 if (rt == 0 || tid == pid) {
736 inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
737 kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
738 }
739 }
740 }
741
742 static void tlbilx_one(struct kvmppc_vcpu_e500 *vcpu_e500, int pid,
743 int ra, int rb)
744 {
745 int tlbsel, esel;
746 gva_t ea;
747
748 ea = kvmppc_get_gpr(&vcpu_e500->vcpu, rb);
749 if (ra)
750 ea += kvmppc_get_gpr(&vcpu_e500->vcpu, ra);
751
752 for (tlbsel = 0; tlbsel < 2; tlbsel++) {
753 esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, -1);
754 if (esel >= 0) {
755 inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
756 kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
757 break;
758 }
759 }
760 }
761
762 int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int rt, int ra, int rb)
763 {
764 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
765 int pid = get_cur_spid(vcpu);
766
767 if (rt == 0 || rt == 1) {
768 tlbilx_all(vcpu_e500, 0, pid, rt);
769 tlbilx_all(vcpu_e500, 1, pid, rt);
770 } else if (rt == 3) {
771 tlbilx_one(vcpu_e500, pid, ra, rb);
772 }
773
774 return EMULATE_DONE;
775 }
776
777 int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu)
778 {
779 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
780 int tlbsel, esel;
781 struct kvm_book3e_206_tlb_entry *gtlbe;
782
783 tlbsel = get_tlb_tlbsel(vcpu);
784 esel = get_tlb_esel(vcpu, tlbsel);
785
786 gtlbe = get_entry(vcpu_e500, tlbsel, esel);
787 vcpu->arch.shared->mas0 &= ~MAS0_NV(~0);
788 vcpu->arch.shared->mas0 |= MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
789 vcpu->arch.shared->mas1 = gtlbe->mas1;
790 vcpu->arch.shared->mas2 = gtlbe->mas2;
791 vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
792
793 return EMULATE_DONE;
794 }
795
796 int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb)
797 {
798 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
799 int as = !!get_cur_sas(vcpu);
800 unsigned int pid = get_cur_spid(vcpu);
801 int esel, tlbsel;
802 struct kvm_book3e_206_tlb_entry *gtlbe = NULL;
803 gva_t ea;
804
805 ea = kvmppc_get_gpr(vcpu, rb);
806
807 for (tlbsel = 0; tlbsel < 2; tlbsel++) {
808 esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, as);
809 if (esel >= 0) {
810 gtlbe = get_entry(vcpu_e500, tlbsel, esel);
811 break;
812 }
813 }
814
815 if (gtlbe) {
816 esel &= vcpu_e500->gtlb_params[tlbsel].ways - 1;
817
818 vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel)
819 | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
820 vcpu->arch.shared->mas1 = gtlbe->mas1;
821 vcpu->arch.shared->mas2 = gtlbe->mas2;
822 vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
823 } else {
824 int victim;
825
826 /* since we only have two TLBs, only lower bit is used. */
827 tlbsel = vcpu->arch.shared->mas4 >> 28 & 0x1;
828 victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
829
830 vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel)
831 | MAS0_ESEL(victim)
832 | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
833 vcpu->arch.shared->mas1 =
834 (vcpu->arch.shared->mas6 & MAS6_SPID0)
835 | (vcpu->arch.shared->mas6 & (MAS6_SAS ? MAS1_TS : 0))
836 | (vcpu->arch.shared->mas4 & MAS4_TSIZED(~0));
837 vcpu->arch.shared->mas2 &= MAS2_EPN;
838 vcpu->arch.shared->mas2 |= vcpu->arch.shared->mas4 &
839 MAS2_ATTRIB_MASK;
840 vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 |
841 MAS3_U2 | MAS3_U3;
842 }
843
844 kvmppc_set_exit_type(vcpu, EMULATED_TLBSX_EXITS);
845 return EMULATE_DONE;
846 }
847
848 /* sesel is for tlb1 only */
849 static void write_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
850 struct kvm_book3e_206_tlb_entry *gtlbe,
851 struct kvm_book3e_206_tlb_entry *stlbe,
852 int stlbsel, int sesel)
853 {
854 int stid;
855
856 preempt_disable();
857 stid = kvmppc_e500_get_tlb_stid(&vcpu_e500->vcpu, gtlbe);
858
859 stlbe->mas1 |= MAS1_TID(stid);
860 write_host_tlbe(vcpu_e500, stlbsel, sesel, stlbe);
861 preempt_enable();
862 }
863
864 int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu)
865 {
866 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
867 struct kvm_book3e_206_tlb_entry *gtlbe, stlbe;
868 int tlbsel, esel, stlbsel, sesel;
869 int recal = 0;
870
871 tlbsel = get_tlb_tlbsel(vcpu);
872 esel = get_tlb_esel(vcpu, tlbsel);
873
874 gtlbe = get_entry(vcpu_e500, tlbsel, esel);
875
876 if (get_tlb_v(gtlbe)) {
877 inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
878 if ((tlbsel == 1) &&
879 kvmppc_need_recalc_tlb1map_range(vcpu_e500, gtlbe))
880 recal = 1;
881 }
882
883 gtlbe->mas1 = vcpu->arch.shared->mas1;
884 gtlbe->mas2 = vcpu->arch.shared->mas2;
885 gtlbe->mas7_3 = vcpu->arch.shared->mas7_3;
886
887 trace_kvm_booke206_gtlb_write(vcpu->arch.shared->mas0, gtlbe->mas1,
888 gtlbe->mas2, gtlbe->mas7_3);
889
890 if (tlbsel == 1) {
891 /*
892 * If a valid tlb1 entry is overwritten then recalculate the
893 * min/max TLB1 map address range otherwise no need to look
894 * in tlb1 array.
895 */
896 if (recal)
897 kvmppc_recalc_tlb1map_range(vcpu_e500);
898 else
899 kvmppc_set_tlb1map_range(vcpu, gtlbe);
900 }
901
902 /* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
903 if (tlbe_is_host_safe(vcpu, gtlbe)) {
904 u64 eaddr;
905 u64 raddr;
906
907 switch (tlbsel) {
908 case 0:
909 /* TLB0 */
910 gtlbe->mas1 &= ~MAS1_TSIZE(~0);
911 gtlbe->mas1 |= MAS1_TSIZE(BOOK3E_PAGESZ_4K);
912
913 stlbsel = 0;
914 kvmppc_e500_tlb0_map(vcpu_e500, esel, &stlbe);
915 sesel = 0; /* unused */
916
917 break;
918
919 case 1:
920 /* TLB1 */
921 eaddr = get_tlb_eaddr(gtlbe);
922 raddr = get_tlb_raddr(gtlbe);
923
924 /* Create a 4KB mapping on the host.
925 * If the guest wanted a large page,
926 * only the first 4KB is mapped here and the rest
927 * are mapped on the fly. */
928 stlbsel = 1;
929 sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr,
930 raddr >> PAGE_SHIFT, gtlbe, &stlbe, esel);
931 break;
932
933 default:
934 BUG();
935 }
936
937 write_stlbe(vcpu_e500, gtlbe, &stlbe, stlbsel, sesel);
938 }
939
940 kvmppc_set_exit_type(vcpu, EMULATED_TLBWE_EXITS);
941 return EMULATE_DONE;
942 }
943
944 static int kvmppc_e500_tlb_search(struct kvm_vcpu *vcpu,
945 gva_t eaddr, unsigned int pid, int as)
946 {
947 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
948 int esel, tlbsel;
949
950 for (tlbsel = 0; tlbsel < 2; tlbsel++) {
951 esel = kvmppc_e500_tlb_index(vcpu_e500, eaddr, tlbsel, pid, as);
952 if (esel >= 0)
953 return index_of(tlbsel, esel);
954 }
955
956 return -1;
957 }
958
959 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
960 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
961 struct kvm_translation *tr)
962 {
963 int index;
964 gva_t eaddr;
965 u8 pid;
966 u8 as;
967
968 eaddr = tr->linear_address;
969 pid = (tr->linear_address >> 32) & 0xff;
970 as = (tr->linear_address >> 40) & 0x1;
971
972 index = kvmppc_e500_tlb_search(vcpu, eaddr, pid, as);
973 if (index < 0) {
974 tr->valid = 0;
975 return 0;
976 }
977
978 tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
979 /* XXX what does "writeable" and "usermode" even mean? */
980 tr->valid = 1;
981
982 return 0;
983 }
984
985
986 int kvmppc_mmu_itlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
987 {
988 unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);
989
990 return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
991 }
992
993 int kvmppc_mmu_dtlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
994 {
995 unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);
996
997 return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
998 }
999
1000 void kvmppc_mmu_itlb_miss(struct kvm_vcpu *vcpu)
1001 {
1002 unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);
1003
1004 kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.pc, as);
1005 }
1006
1007 void kvmppc_mmu_dtlb_miss(struct kvm_vcpu *vcpu)
1008 {
1009 unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);
1010
1011 kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.fault_dear, as);
1012 }
1013
1014 gpa_t kvmppc_mmu_xlate(struct kvm_vcpu *vcpu, unsigned int index,
1015 gva_t eaddr)
1016 {
1017 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
1018 struct kvm_book3e_206_tlb_entry *gtlbe;
1019 u64 pgmask;
1020
1021 gtlbe = get_entry(vcpu_e500, tlbsel_of(index), esel_of(index));
1022 pgmask = get_tlb_bytes(gtlbe) - 1;
1023
1024 return get_tlb_raddr(gtlbe) | (eaddr & pgmask);
1025 }
1026
1027 void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
1028 {
1029 }
1030
1031 void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr,
1032 unsigned int index)
1033 {
1034 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
1035 struct tlbe_priv *priv;
1036 struct kvm_book3e_206_tlb_entry *gtlbe, stlbe;
1037 int tlbsel = tlbsel_of(index);
1038 int esel = esel_of(index);
1039 int stlbsel, sesel;
1040
1041 gtlbe = get_entry(vcpu_e500, tlbsel, esel);
1042
1043 switch (tlbsel) {
1044 case 0:
1045 stlbsel = 0;
1046 sesel = 0; /* unused */
1047 priv = &vcpu_e500->gtlb_priv[tlbsel][esel];
1048
1049 /* Only triggers after clear_tlb_refs */
1050 if (unlikely(!(priv->ref.flags & E500_TLB_VALID)))
1051 kvmppc_e500_tlb0_map(vcpu_e500, esel, &stlbe);
1052 else
1053 kvmppc_e500_setup_stlbe(vcpu, gtlbe, BOOK3E_PAGESZ_4K,
1054 &priv->ref, eaddr, &stlbe);
1055 break;
1056
1057 case 1: {
1058 gfn_t gfn = gpaddr >> PAGE_SHIFT;
1059
1060 stlbsel = 1;
1061 sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr, gfn,
1062 gtlbe, &stlbe, esel);
1063 break;
1064 }
1065
1066 default:
1067 BUG();
1068 break;
1069 }
1070
1071 write_stlbe(vcpu_e500, gtlbe, &stlbe, stlbsel, sesel);
1072 }
1073
1074 /************* MMU Notifiers *************/
1075
1076 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
1077 {
1078 trace_kvm_unmap_hva(hva);
1079
1080 /*
1081 * Flush all shadow tlb entries everywhere. This is slow, but
1082 * we are 100% sure that we catch the to be unmapped page
1083 */
1084 kvm_flush_remote_tlbs(kvm);
1085
1086 return 0;
1087 }
1088
1089 int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
1090 {
1091 /* kvm_unmap_hva flushes everything anyways */
1092 kvm_unmap_hva(kvm, start);
1093
1094 return 0;
1095 }
1096
1097 int kvm_age_hva(struct kvm *kvm, unsigned long hva)
1098 {
1099 /* XXX could be more clever ;) */
1100 return 0;
1101 }
1102
1103 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
1104 {
1105 /* XXX could be more clever ;) */
1106 return 0;
1107 }
1108
1109 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
1110 {
1111 /* The page will get remapped properly on its next fault */
1112 kvm_unmap_hva(kvm, hva);
1113 }
1114
1115 /*****************************************/
1116
1117 static void free_gtlb(struct kvmppc_vcpu_e500 *vcpu_e500)
1118 {
1119 int i;
1120
1121 clear_tlb1_bitmap(vcpu_e500);
1122 kfree(vcpu_e500->g2h_tlb1_map);
1123
1124 clear_tlb_refs(vcpu_e500);
1125 kfree(vcpu_e500->gtlb_priv[0]);
1126 kfree(vcpu_e500->gtlb_priv[1]);
1127
1128 if (vcpu_e500->shared_tlb_pages) {
1129 vfree((void *)(round_down((uintptr_t)vcpu_e500->gtlb_arch,
1130 PAGE_SIZE)));
1131
1132 for (i = 0; i < vcpu_e500->num_shared_tlb_pages; i++) {
1133 set_page_dirty_lock(vcpu_e500->shared_tlb_pages[i]);
1134 put_page(vcpu_e500->shared_tlb_pages[i]);
1135 }
1136
1137 vcpu_e500->num_shared_tlb_pages = 0;
1138
1139 kfree(vcpu_e500->shared_tlb_pages);
1140 vcpu_e500->shared_tlb_pages = NULL;
1141 } else {
1142 kfree(vcpu_e500->gtlb_arch);
1143 }
1144
1145 vcpu_e500->gtlb_arch = NULL;
1146 }
1147
1148 void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
1149 {
1150 sregs->u.e.mas0 = vcpu->arch.shared->mas0;
1151 sregs->u.e.mas1 = vcpu->arch.shared->mas1;
1152 sregs->u.e.mas2 = vcpu->arch.shared->mas2;
1153 sregs->u.e.mas7_3 = vcpu->arch.shared->mas7_3;
1154 sregs->u.e.mas4 = vcpu->arch.shared->mas4;
1155 sregs->u.e.mas6 = vcpu->arch.shared->mas6;
1156
1157 sregs->u.e.mmucfg = vcpu->arch.mmucfg;
1158 sregs->u.e.tlbcfg[0] = vcpu->arch.tlbcfg[0];
1159 sregs->u.e.tlbcfg[1] = vcpu->arch.tlbcfg[1];
1160 sregs->u.e.tlbcfg[2] = 0;
1161 sregs->u.e.tlbcfg[3] = 0;
1162 }
1163
1164 int kvmppc_set_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
1165 {
1166 if (sregs->u.e.features & KVM_SREGS_E_ARCH206_MMU) {
1167 vcpu->arch.shared->mas0 = sregs->u.e.mas0;
1168 vcpu->arch.shared->mas1 = sregs->u.e.mas1;
1169 vcpu->arch.shared->mas2 = sregs->u.e.mas2;
1170 vcpu->arch.shared->mas7_3 = sregs->u.e.mas7_3;
1171 vcpu->arch.shared->mas4 = sregs->u.e.mas4;
1172 vcpu->arch.shared->mas6 = sregs->u.e.mas6;
1173 }
1174
1175 return 0;
1176 }
1177
1178 int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu,
1179 struct kvm_config_tlb *cfg)
1180 {
1181 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
1182 struct kvm_book3e_206_tlb_params params;
1183 char *virt;
1184 struct page **pages;
1185 struct tlbe_priv *privs[2] = {};
1186 u64 *g2h_bitmap = NULL;
1187 size_t array_len;
1188 u32 sets;
1189 int num_pages, ret, i;
1190
1191 if (cfg->mmu_type != KVM_MMU_FSL_BOOKE_NOHV)
1192 return -EINVAL;
1193
1194 if (copy_from_user(&params, (void __user *)(uintptr_t)cfg->params,
1195 sizeof(params)))
1196 return -EFAULT;
1197
1198 if (params.tlb_sizes[1] > 64)
1199 return -EINVAL;
1200 if (params.tlb_ways[1] != params.tlb_sizes[1])
1201 return -EINVAL;
1202 if (params.tlb_sizes[2] != 0 || params.tlb_sizes[3] != 0)
1203 return -EINVAL;
1204 if (params.tlb_ways[2] != 0 || params.tlb_ways[3] != 0)
1205 return -EINVAL;
1206
1207 if (!is_power_of_2(params.tlb_ways[0]))
1208 return -EINVAL;
1209
1210 sets = params.tlb_sizes[0] >> ilog2(params.tlb_ways[0]);
1211 if (!is_power_of_2(sets))
1212 return -EINVAL;
1213
1214 array_len = params.tlb_sizes[0] + params.tlb_sizes[1];
1215 array_len *= sizeof(struct kvm_book3e_206_tlb_entry);
1216
1217 if (cfg->array_len < array_len)
1218 return -EINVAL;
1219
1220 num_pages = DIV_ROUND_UP(cfg->array + array_len - 1, PAGE_SIZE) -
1221 cfg->array / PAGE_SIZE;
1222 pages = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL);
1223 if (!pages)
1224 return -ENOMEM;
1225
1226 ret = get_user_pages_fast(cfg->array, num_pages, 1, pages);
1227 if (ret < 0)
1228 goto err_pages;
1229
1230 if (ret != num_pages) {
1231 num_pages = ret;
1232 ret = -EFAULT;
1233 goto err_put_page;
1234 }
1235
1236 virt = vmap(pages, num_pages, VM_MAP, PAGE_KERNEL);
1237 if (!virt) {
1238 ret = -ENOMEM;
1239 goto err_put_page;
1240 }
1241
1242 privs[0] = kzalloc(sizeof(struct tlbe_priv) * params.tlb_sizes[0],
1243 GFP_KERNEL);
1244 privs[1] = kzalloc(sizeof(struct tlbe_priv) * params.tlb_sizes[1],
1245 GFP_KERNEL);
1246
1247 if (!privs[0] || !privs[1]) {
1248 ret = -ENOMEM;
1249 goto err_privs;
1250 }
1251
1252 g2h_bitmap = kzalloc(sizeof(u64) * params.tlb_sizes[1],
1253 GFP_KERNEL);
1254 if (!g2h_bitmap) {
1255 ret = -ENOMEM;
1256 goto err_privs;
1257 }
1258
1259 free_gtlb(vcpu_e500);
1260
1261 vcpu_e500->gtlb_priv[0] = privs[0];
1262 vcpu_e500->gtlb_priv[1] = privs[1];
1263 vcpu_e500->g2h_tlb1_map = g2h_bitmap;
1264
1265 vcpu_e500->gtlb_arch = (struct kvm_book3e_206_tlb_entry *)
1266 (virt + (cfg->array & (PAGE_SIZE - 1)));
1267
1268 vcpu_e500->gtlb_params[0].entries = params.tlb_sizes[0];
1269 vcpu_e500->gtlb_params[1].entries = params.tlb_sizes[1];
1270
1271 vcpu_e500->gtlb_offset[0] = 0;
1272 vcpu_e500->gtlb_offset[1] = params.tlb_sizes[0];
1273
1274 vcpu->arch.mmucfg = mfspr(SPRN_MMUCFG) & ~MMUCFG_LPIDSIZE;
1275
1276 vcpu->arch.tlbcfg[0] &= ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
1277 if (params.tlb_sizes[0] <= 2048)
1278 vcpu->arch.tlbcfg[0] |= params.tlb_sizes[0];
1279 vcpu->arch.tlbcfg[0] |= params.tlb_ways[0] << TLBnCFG_ASSOC_SHIFT;
1280
1281 vcpu->arch.tlbcfg[1] &= ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
1282 vcpu->arch.tlbcfg[1] |= params.tlb_sizes[1];
1283 vcpu->arch.tlbcfg[1] |= params.tlb_ways[1] << TLBnCFG_ASSOC_SHIFT;
1284
1285 vcpu_e500->shared_tlb_pages = pages;
1286 vcpu_e500->num_shared_tlb_pages = num_pages;
1287
1288 vcpu_e500->gtlb_params[0].ways = params.tlb_ways[0];
1289 vcpu_e500->gtlb_params[0].sets = sets;
1290
1291 vcpu_e500->gtlb_params[1].ways = params.tlb_sizes[1];
1292 vcpu_e500->gtlb_params[1].sets = 1;
1293
1294 kvmppc_recalc_tlb1map_range(vcpu_e500);
1295 return 0;
1296
1297 err_privs:
1298 kfree(privs[0]);
1299 kfree(privs[1]);
1300
1301 err_put_page:
1302 for (i = 0; i < num_pages; i++)
1303 put_page(pages[i]);
1304
1305 err_pages:
1306 kfree(pages);
1307 return ret;
1308 }
1309
1310 int kvm_vcpu_ioctl_dirty_tlb(struct kvm_vcpu *vcpu,
1311 struct kvm_dirty_tlb *dirty)
1312 {
1313 struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
1314 kvmppc_recalc_tlb1map_range(vcpu_e500);
1315 clear_tlb_refs(vcpu_e500);
1316 return 0;
1317 }
1318
1319 int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
1320 {
1321 struct kvm_vcpu *vcpu = &vcpu_e500->vcpu;
1322 int entry_size = sizeof(struct kvm_book3e_206_tlb_entry);
1323 int entries = KVM_E500_TLB0_SIZE + KVM_E500_TLB1_SIZE;
1324
1325 host_tlb_params[0].entries = mfspr(SPRN_TLB0CFG) & TLBnCFG_N_ENTRY;
1326 host_tlb_params[1].entries = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
1327
1328 /*
1329 * This should never happen on real e500 hardware, but is
1330 * architecturally possible -- e.g. in some weird nested
1331 * virtualization case.
1332 */
1333 if (host_tlb_params[0].entries == 0 ||
1334 host_tlb_params[1].entries == 0) {
1335 pr_err("%s: need to know host tlb size\n", __func__);
1336 return -ENODEV;
1337 }
1338
1339 host_tlb_params[0].ways = (mfspr(SPRN_TLB0CFG) & TLBnCFG_ASSOC) >>
1340 TLBnCFG_ASSOC_SHIFT;
1341 host_tlb_params[1].ways = host_tlb_params[1].entries;
1342
1343 if (!is_power_of_2(host_tlb_params[0].entries) ||
1344 !is_power_of_2(host_tlb_params[0].ways) ||
1345 host_tlb_params[0].entries < host_tlb_params[0].ways ||
1346 host_tlb_params[0].ways == 0) {
1347 pr_err("%s: bad tlb0 host config: %u entries %u ways\n",
1348 __func__, host_tlb_params[0].entries,
1349 host_tlb_params[0].ways);
1350 return -ENODEV;
1351 }
1352
1353 host_tlb_params[0].sets =
1354 host_tlb_params[0].entries / host_tlb_params[0].ways;
1355 host_tlb_params[1].sets = 1;
1356
1357 vcpu_e500->gtlb_params[0].entries = KVM_E500_TLB0_SIZE;
1358 vcpu_e500->gtlb_params[1].entries = KVM_E500_TLB1_SIZE;
1359
1360 vcpu_e500->gtlb_params[0].ways = KVM_E500_TLB0_WAY_NUM;
1361 vcpu_e500->gtlb_params[0].sets =
1362 KVM_E500_TLB0_SIZE / KVM_E500_TLB0_WAY_NUM;
1363
1364 vcpu_e500->gtlb_params[1].ways = KVM_E500_TLB1_SIZE;
1365 vcpu_e500->gtlb_params[1].sets = 1;
1366
1367 vcpu_e500->gtlb_arch = kmalloc(entries * entry_size, GFP_KERNEL);
1368 if (!vcpu_e500->gtlb_arch)
1369 return -ENOMEM;
1370
1371 vcpu_e500->gtlb_offset[0] = 0;
1372 vcpu_e500->gtlb_offset[1] = KVM_E500_TLB0_SIZE;
1373
1374 vcpu_e500->tlb_refs[0] =
1375 kzalloc(sizeof(struct tlbe_ref) * host_tlb_params[0].entries,
1376 GFP_KERNEL);
1377 if (!vcpu_e500->tlb_refs[0])
1378 goto err;
1379
1380 vcpu_e500->tlb_refs[1] =
1381 kzalloc(sizeof(struct tlbe_ref) * host_tlb_params[1].entries,
1382 GFP_KERNEL);
1383 if (!vcpu_e500->tlb_refs[1])
1384 goto err;
1385
1386 vcpu_e500->gtlb_priv[0] = kzalloc(sizeof(struct tlbe_ref) *
1387 vcpu_e500->gtlb_params[0].entries,
1388 GFP_KERNEL);
1389 if (!vcpu_e500->gtlb_priv[0])
1390 goto err;
1391
1392 vcpu_e500->gtlb_priv[1] = kzalloc(sizeof(struct tlbe_ref) *
1393 vcpu_e500->gtlb_params[1].entries,
1394 GFP_KERNEL);
1395 if (!vcpu_e500->gtlb_priv[1])
1396 goto err;
1397
1398 vcpu_e500->g2h_tlb1_map = kzalloc(sizeof(u64) *
1399 vcpu_e500->gtlb_params[1].entries,
1400 GFP_KERNEL);
1401 if (!vcpu_e500->g2h_tlb1_map)
1402 goto err;
1403
1404 vcpu_e500->h2g_tlb1_rmap = kzalloc(sizeof(unsigned int) *
1405 host_tlb_params[1].entries,
1406 GFP_KERNEL);
1407 if (!vcpu_e500->h2g_tlb1_rmap)
1408 goto err;
1409
1410 /* Init TLB configuration register */
1411 vcpu->arch.tlbcfg[0] = mfspr(SPRN_TLB0CFG) &
1412 ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
1413 vcpu->arch.tlbcfg[0] |= vcpu_e500->gtlb_params[0].entries;
1414 vcpu->arch.tlbcfg[0] |=
1415 vcpu_e500->gtlb_params[0].ways << TLBnCFG_ASSOC_SHIFT;
1416
1417 vcpu->arch.tlbcfg[1] = mfspr(SPRN_TLB1CFG) &
1418 ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
1419 vcpu->arch.tlbcfg[1] |= vcpu_e500->gtlb_params[1].entries;
1420 vcpu->arch.tlbcfg[1] |=
1421 vcpu_e500->gtlb_params[1].ways << TLBnCFG_ASSOC_SHIFT;
1422
1423 kvmppc_recalc_tlb1map_range(vcpu_e500);
1424 return 0;
1425
1426 err:
1427 free_gtlb(vcpu_e500);
1428 kfree(vcpu_e500->tlb_refs[0]);
1429 kfree(vcpu_e500->tlb_refs[1]);
1430 return -1;
1431 }
1432
1433 void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500)
1434 {
1435 free_gtlb(vcpu_e500);
1436 kfree(vcpu_e500->h2g_tlb1_rmap);
1437 kfree(vcpu_e500->tlb_refs[0]);
1438 kfree(vcpu_e500->tlb_refs[1]);
1439 }
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