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e500_tlb.c
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1 /*
2  * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All rights reserved.
3  *
4  * Author: Yu Liu, [email protected]
5  * Scott Wood, [email protected]
6  * Ashish Kalra, [email protected]
7  * Varun Sethi, [email protected]
8  *
9  * Description:
10  * This file is based on arch/powerpc/kvm/44x_tlb.c,
11  * by Hollis Blanchard <[email protected]>.
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  ref->flags |= E500_TLB_DIRTY;
308 }
309 
310 static inline void kvmppc_e500_ref_release(struct tlbe_ref *ref)
311 {
312  if (ref->flags & E500_TLB_VALID) {
313  if (ref->flags & E500_TLB_DIRTY)
314  kvm_release_pfn_dirty(ref->pfn);
315  else
316  kvm_release_pfn_clean(ref->pfn);
317 
318  ref->flags = 0;
319  }
320 }
321 
322 static void clear_tlb1_bitmap(struct kvmppc_vcpu_e500 *vcpu_e500)
323 {
324  if (vcpu_e500->g2h_tlb1_map)
325  memset(vcpu_e500->g2h_tlb1_map, 0,
326  sizeof(u64) * vcpu_e500->gtlb_params[1].entries);
327  if (vcpu_e500->h2g_tlb1_rmap)
328  memset(vcpu_e500->h2g_tlb1_rmap, 0,
329  sizeof(unsigned int) * host_tlb_params[1].entries);
330 }
331 
332 static void clear_tlb_privs(struct kvmppc_vcpu_e500 *vcpu_e500)
333 {
334  int tlbsel = 0;
335  int i;
336 
337  for (i = 0; i < vcpu_e500->gtlb_params[tlbsel].entries; i++) {
338  struct tlbe_ref *ref =
339  &vcpu_e500->gtlb_priv[tlbsel][i].ref;
340  kvmppc_e500_ref_release(ref);
341  }
342 }
343 
344 static void clear_tlb_refs(struct kvmppc_vcpu_e500 *vcpu_e500)
345 {
346  int stlbsel = 1;
347  int i;
348 
349  kvmppc_e500_tlbil_all(vcpu_e500);
350 
351  for (i = 0; i < host_tlb_params[stlbsel].entries; i++) {
352  struct tlbe_ref *ref =
353  &vcpu_e500->tlb_refs[stlbsel][i];
354  kvmppc_e500_ref_release(ref);
355  }
356 
357  clear_tlb_privs(vcpu_e500);
358 }
359 
360 static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu,
361  unsigned int eaddr, int as)
362 {
363  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
364  unsigned int victim, tsized;
365  int tlbsel;
366 
367  /* since we only have two TLBs, only lower bit is used. */
368  tlbsel = (vcpu->arch.shared->mas4 >> 28) & 0x1;
369  victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
370  tsized = (vcpu->arch.shared->mas4 >> 7) & 0x1f;
371 
372  vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
373  | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
374  vcpu->arch.shared->mas1 = MAS1_VALID | (as ? MAS1_TS : 0)
375  | MAS1_TID(get_tlbmiss_tid(vcpu))
376  | MAS1_TSIZE(tsized);
377  vcpu->arch.shared->mas2 = (eaddr & MAS2_EPN)
378  | (vcpu->arch.shared->mas4 & MAS2_ATTRIB_MASK);
379  vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
380  vcpu->arch.shared->mas6 = (vcpu->arch.shared->mas6 & MAS6_SPID1)
381  | (get_cur_pid(vcpu) << 16)
382  | (as ? MAS6_SAS : 0);
383 }
384 
385 /* TID must be supplied by the caller */
386 static inline void kvmppc_e500_setup_stlbe(
387  struct kvm_vcpu *vcpu,
388  struct kvm_book3e_206_tlb_entry *gtlbe,
389  int tsize, struct tlbe_ref *ref, u64 gvaddr,
390  struct kvm_book3e_206_tlb_entry *stlbe)
391 {
392  pfn_t pfn = ref->pfn;
393  u32 pr = vcpu->arch.shared->msr & MSR_PR;
394 
395  BUG_ON(!(ref->flags & E500_TLB_VALID));
396 
397  /* Force IPROT=0 for all guest mappings. */
398  stlbe->mas1 = MAS1_TSIZE(tsize) | get_tlb_sts(gtlbe) | MAS1_VALID;
399  stlbe->mas2 = (gvaddr & MAS2_EPN) |
400  e500_shadow_mas2_attrib(gtlbe->mas2, pr);
401  stlbe->mas7_3 = ((u64)pfn << PAGE_SHIFT) |
402  e500_shadow_mas3_attrib(gtlbe->mas7_3, pr);
403 
404 #ifdef CONFIG_KVM_BOOKE_HV
405  stlbe->mas8 = MAS8_TGS | vcpu->kvm->arch.lpid;
406 #endif
407 }
408 
409 static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
410  u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe,
411  int tlbsel, struct kvm_book3e_206_tlb_entry *stlbe,
412  struct tlbe_ref *ref)
413 {
414  struct kvm_memory_slot *slot;
415  unsigned long pfn, hva;
416  int pfnmap = 0;
417  int tsize = BOOK3E_PAGESZ_4K;
418 
419  /*
420  * Translate guest physical to true physical, acquiring
421  * a page reference if it is normal, non-reserved memory.
422  *
423  * gfn_to_memslot() must succeed because otherwise we wouldn't
424  * have gotten this far. Eventually we should just pass the slot
425  * pointer through from the first lookup.
426  */
427  slot = gfn_to_memslot(vcpu_e500->vcpu.kvm, gfn);
428  hva = gfn_to_hva_memslot(slot, gfn);
429 
430  if (tlbsel == 1) {
431  struct vm_area_struct *vma;
432  down_read(&current->mm->mmap_sem);
433 
434  vma = find_vma(current->mm, hva);
435  if (vma && hva >= vma->vm_start &&
436  (vma->vm_flags & VM_PFNMAP)) {
437  /*
438  * This VMA is a physically contiguous region (e.g.
439  * /dev/mem) that bypasses normal Linux page
440  * management. Find the overlap between the
441  * vma and the memslot.
442  */
443 
444  unsigned long start, end;
445  unsigned long slot_start, slot_end;
446 
447  pfnmap = 1;
448 
449  start = vma->vm_pgoff;
450  end = start +
451  ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
452 
453  pfn = start + ((hva - vma->vm_start) >> PAGE_SHIFT);
454 
455  slot_start = pfn - (gfn - slot->base_gfn);
456  slot_end = slot_start + slot->npages;
457 
458  if (start < slot_start)
459  start = slot_start;
460  if (end > slot_end)
461  end = slot_end;
462 
463  tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >>
464  MAS1_TSIZE_SHIFT;
465 
466  /*
467  * e500 doesn't implement the lowest tsize bit,
468  * or 1K pages.
469  */
470  tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1);
471 
472  /*
473  * Now find the largest tsize (up to what the guest
474  * requested) that will cover gfn, stay within the
475  * range, and for which gfn and pfn are mutually
476  * aligned.
477  */
478 
479  for (; tsize > BOOK3E_PAGESZ_4K; tsize -= 2) {
480  unsigned long gfn_start, gfn_end, tsize_pages;
481  tsize_pages = 1 << (tsize - 2);
482 
483  gfn_start = gfn & ~(tsize_pages - 1);
484  gfn_end = gfn_start + tsize_pages;
485 
486  if (gfn_start + pfn - gfn < start)
487  continue;
488  if (gfn_end + pfn - gfn > end)
489  continue;
490  if ((gfn & (tsize_pages - 1)) !=
491  (pfn & (tsize_pages - 1)))
492  continue;
493 
494  gvaddr &= ~((tsize_pages << PAGE_SHIFT) - 1);
495  pfn &= ~(tsize_pages - 1);
496  break;
497  }
498  } else if (vma && hva >= vma->vm_start &&
499  (vma->vm_flags & VM_HUGETLB)) {
500  unsigned long psize = vma_kernel_pagesize(vma);
501 
502  tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >>
503  MAS1_TSIZE_SHIFT;
504 
505  /*
506  * Take the largest page size that satisfies both host
507  * and guest mapping
508  */
509  tsize = min(__ilog2(psize) - 10, tsize);
510 
511  /*
512  * e500 doesn't implement the lowest tsize bit,
513  * or 1K pages.
514  */
515  tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1);
516  }
517 
518  up_read(&current->mm->mmap_sem);
519  }
520 
521  if (likely(!pfnmap)) {
522  unsigned long tsize_pages = 1 << (tsize + 10 - PAGE_SHIFT);
523  pfn = gfn_to_pfn_memslot(slot, gfn);
524  if (is_error_pfn(pfn)) {
525  printk(KERN_ERR "Couldn't get real page for gfn %lx!\n",
526  (long)gfn);
527  return;
528  }
529 
530  /* Align guest and physical address to page map boundaries */
531  pfn &= ~(tsize_pages - 1);
532  gvaddr &= ~((tsize_pages << PAGE_SHIFT) - 1);
533  }
534 
535  /* Drop old ref and setup new one. */
536  kvmppc_e500_ref_release(ref);
537  kvmppc_e500_ref_setup(ref, gtlbe, pfn);
538 
539  kvmppc_e500_setup_stlbe(&vcpu_e500->vcpu, gtlbe, tsize,
540  ref, gvaddr, stlbe);
541 
542  /* Clear i-cache for new pages */
543  kvmppc_mmu_flush_icache(pfn);
544 }
545 
546 /* XXX only map the one-one case, for now use TLB0 */
547 static void kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500,
548  int esel,
549  struct kvm_book3e_206_tlb_entry *stlbe)
550 {
551  struct kvm_book3e_206_tlb_entry *gtlbe;
552  struct tlbe_ref *ref;
553 
554  gtlbe = get_entry(vcpu_e500, 0, esel);
555  ref = &vcpu_e500->gtlb_priv[0][esel].ref;
556 
557  kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe),
558  get_tlb_raddr(gtlbe) >> PAGE_SHIFT,
559  gtlbe, 0, stlbe, ref);
560 }
561 
562 /* Caller must ensure that the specified guest TLB entry is safe to insert into
563  * the shadow TLB. */
564 /* XXX for both one-one and one-to-many , for now use TLB1 */
565 static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500,
566  u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe,
567  struct kvm_book3e_206_tlb_entry *stlbe, int esel)
568 {
569  struct tlbe_ref *ref;
570  unsigned int victim;
571 
572  victim = vcpu_e500->host_tlb1_nv++;
573 
574  if (unlikely(vcpu_e500->host_tlb1_nv >= tlb1_max_shadow_size()))
575  vcpu_e500->host_tlb1_nv = 0;
576 
577  ref = &vcpu_e500->tlb_refs[1][victim];
578  kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, stlbe, ref);
579 
580  vcpu_e500->g2h_tlb1_map[esel] |= (u64)1 << victim;
581  vcpu_e500->gtlb_priv[1][esel].ref.flags |= E500_TLB_BITMAP;
582  if (vcpu_e500->h2g_tlb1_rmap[victim]) {
583  unsigned int idx = vcpu_e500->h2g_tlb1_rmap[victim];
584  vcpu_e500->g2h_tlb1_map[idx] &= ~(1ULL << victim);
585  }
586  vcpu_e500->h2g_tlb1_rmap[victim] = esel;
587 
588  return victim;
589 }
590 
591 static void kvmppc_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500)
592 {
593  int size = vcpu_e500->gtlb_params[1].entries;
594  unsigned int offset;
595  gva_t eaddr;
596  int i;
597 
598  vcpu_e500->tlb1_min_eaddr = ~0UL;
599  vcpu_e500->tlb1_max_eaddr = 0;
600  offset = vcpu_e500->gtlb_offset[1];
601 
602  for (i = 0; i < size; i++) {
603  struct kvm_book3e_206_tlb_entry *tlbe =
604  &vcpu_e500->gtlb_arch[offset + i];
605 
606  if (!get_tlb_v(tlbe))
607  continue;
608 
609  eaddr = get_tlb_eaddr(tlbe);
610  vcpu_e500->tlb1_min_eaddr =
611  min(vcpu_e500->tlb1_min_eaddr, eaddr);
612 
613  eaddr = get_tlb_end(tlbe);
614  vcpu_e500->tlb1_max_eaddr =
615  max(vcpu_e500->tlb1_max_eaddr, eaddr);
616  }
617 }
618 
619 static int kvmppc_need_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500,
620  struct kvm_book3e_206_tlb_entry *gtlbe)
621 {
622  unsigned long start, end, size;
623 
624  size = get_tlb_bytes(gtlbe);
625  start = get_tlb_eaddr(gtlbe) & ~(size - 1);
626  end = start + size - 1;
627 
628  return vcpu_e500->tlb1_min_eaddr == start ||
629  vcpu_e500->tlb1_max_eaddr == end;
630 }
631 
632 /* This function is supposed to be called for a adding a new valid tlb entry */
633 static void kvmppc_set_tlb1map_range(struct kvm_vcpu *vcpu,
634  struct kvm_book3e_206_tlb_entry *gtlbe)
635 {
636  unsigned long start, end, size;
637  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
638 
639  if (!get_tlb_v(gtlbe))
640  return;
641 
642  size = get_tlb_bytes(gtlbe);
643  start = get_tlb_eaddr(gtlbe) & ~(size - 1);
644  end = start + size - 1;
645 
646  vcpu_e500->tlb1_min_eaddr = min(vcpu_e500->tlb1_min_eaddr, start);
647  vcpu_e500->tlb1_max_eaddr = max(vcpu_e500->tlb1_max_eaddr, end);
648 }
649 
650 static inline int kvmppc_e500_gtlbe_invalidate(
651  struct kvmppc_vcpu_e500 *vcpu_e500,
652  int tlbsel, int esel)
653 {
654  struct kvm_book3e_206_tlb_entry *gtlbe =
655  get_entry(vcpu_e500, tlbsel, esel);
656 
657  if (unlikely(get_tlb_iprot(gtlbe)))
658  return -1;
659 
660  if (tlbsel == 1 && kvmppc_need_recalc_tlb1map_range(vcpu_e500, gtlbe))
661  kvmppc_recalc_tlb1map_range(vcpu_e500);
662 
663  gtlbe->mas1 = 0;
664 
665  return 0;
666 }
667 
668 int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500, ulong value)
669 {
670  int esel;
671 
672  if (value & MMUCSR0_TLB0FI)
673  for (esel = 0; esel < vcpu_e500->gtlb_params[0].entries; esel++)
674  kvmppc_e500_gtlbe_invalidate(vcpu_e500, 0, esel);
675  if (value & MMUCSR0_TLB1FI)
676  for (esel = 0; esel < vcpu_e500->gtlb_params[1].entries; esel++)
677  kvmppc_e500_gtlbe_invalidate(vcpu_e500, 1, esel);
678 
679  /* Invalidate all vcpu id mappings */
680  kvmppc_e500_tlbil_all(vcpu_e500);
681 
682  return EMULATE_DONE;
683 }
684 
685 int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, int ra, int rb)
686 {
687  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
688  unsigned int ia;
689  int esel, tlbsel;
690  gva_t ea;
691 
692  ea = ((ra) ? kvmppc_get_gpr(vcpu, ra) : 0) + kvmppc_get_gpr(vcpu, rb);
693 
694  ia = (ea >> 2) & 0x1;
695 
696  /* since we only have two TLBs, only lower bit is used. */
697  tlbsel = (ea >> 3) & 0x1;
698 
699  if (ia) {
700  /* invalidate all entries */
701  for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries;
702  esel++)
703  kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
704  } else {
705  ea &= 0xfffff000;
706  esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel,
707  get_cur_pid(vcpu), -1);
708  if (esel >= 0)
709  kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
710  }
711 
712  /* Invalidate all vcpu id mappings */
713  kvmppc_e500_tlbil_all(vcpu_e500);
714 
715  return EMULATE_DONE;
716 }
717 
718 static void tlbilx_all(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel,
719  int pid, int rt)
720 {
721  struct kvm_book3e_206_tlb_entry *tlbe;
722  int tid, esel;
723 
724  /* invalidate all entries */
725  for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries; esel++) {
726  tlbe = get_entry(vcpu_e500, tlbsel, esel);
727  tid = get_tlb_tid(tlbe);
728  if (rt == 0 || tid == pid) {
729  inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
730  kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
731  }
732  }
733 }
734 
735 static void tlbilx_one(struct kvmppc_vcpu_e500 *vcpu_e500, int pid,
736  int ra, int rb)
737 {
738  int tlbsel, esel;
739  gva_t ea;
740 
741  ea = kvmppc_get_gpr(&vcpu_e500->vcpu, rb);
742  if (ra)
743  ea += kvmppc_get_gpr(&vcpu_e500->vcpu, ra);
744 
745  for (tlbsel = 0; tlbsel < 2; tlbsel++) {
746  esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, -1);
747  if (esel >= 0) {
748  inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
749  kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
750  break;
751  }
752  }
753 }
754 
755 int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int rt, int ra, int rb)
756 {
757  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
758  int pid = get_cur_spid(vcpu);
759 
760  if (rt == 0 || rt == 1) {
761  tlbilx_all(vcpu_e500, 0, pid, rt);
762  tlbilx_all(vcpu_e500, 1, pid, rt);
763  } else if (rt == 3) {
764  tlbilx_one(vcpu_e500, pid, ra, rb);
765  }
766 
767  return EMULATE_DONE;
768 }
769 
770 int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu)
771 {
772  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
773  int tlbsel, esel;
774  struct kvm_book3e_206_tlb_entry *gtlbe;
775 
776  tlbsel = get_tlb_tlbsel(vcpu);
777  esel = get_tlb_esel(vcpu, tlbsel);
778 
779  gtlbe = get_entry(vcpu_e500, tlbsel, esel);
780  vcpu->arch.shared->mas0 &= ~MAS0_NV(~0);
781  vcpu->arch.shared->mas0 |= MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
782  vcpu->arch.shared->mas1 = gtlbe->mas1;
783  vcpu->arch.shared->mas2 = gtlbe->mas2;
784  vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
785 
786  return EMULATE_DONE;
787 }
788 
789 int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb)
790 {
791  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
792  int as = !!get_cur_sas(vcpu);
793  unsigned int pid = get_cur_spid(vcpu);
794  int esel, tlbsel;
795  struct kvm_book3e_206_tlb_entry *gtlbe = NULL;
796  gva_t ea;
797 
798  ea = kvmppc_get_gpr(vcpu, rb);
799 
800  for (tlbsel = 0; tlbsel < 2; tlbsel++) {
801  esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, as);
802  if (esel >= 0) {
803  gtlbe = get_entry(vcpu_e500, tlbsel, esel);
804  break;
805  }
806  }
807 
808  if (gtlbe) {
809  esel &= vcpu_e500->gtlb_params[tlbsel].ways - 1;
810 
811  vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel)
812  | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
813  vcpu->arch.shared->mas1 = gtlbe->mas1;
814  vcpu->arch.shared->mas2 = gtlbe->mas2;
815  vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
816  } else {
817  int victim;
818 
819  /* since we only have two TLBs, only lower bit is used. */
820  tlbsel = vcpu->arch.shared->mas4 >> 28 & 0x1;
821  victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
822 
823  vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel)
824  | MAS0_ESEL(victim)
825  | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
826  vcpu->arch.shared->mas1 =
827  (vcpu->arch.shared->mas6 & MAS6_SPID0)
828  | (vcpu->arch.shared->mas6 & (MAS6_SAS ? MAS1_TS : 0))
829  | (vcpu->arch.shared->mas4 & MAS4_TSIZED(~0));
830  vcpu->arch.shared->mas2 &= MAS2_EPN;
831  vcpu->arch.shared->mas2 |= vcpu->arch.shared->mas4 &
832  MAS2_ATTRIB_MASK;
833  vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 |
834  MAS3_U2 | MAS3_U3;
835  }
836 
837  kvmppc_set_exit_type(vcpu, EMULATED_TLBSX_EXITS);
838  return EMULATE_DONE;
839 }
840 
841 /* sesel is for tlb1 only */
842 static void write_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
843  struct kvm_book3e_206_tlb_entry *gtlbe,
844  struct kvm_book3e_206_tlb_entry *stlbe,
845  int stlbsel, int sesel)
846 {
847  int stid;
848 
849  preempt_disable();
850  stid = kvmppc_e500_get_tlb_stid(&vcpu_e500->vcpu, gtlbe);
851 
852  stlbe->mas1 |= MAS1_TID(stid);
853  write_host_tlbe(vcpu_e500, stlbsel, sesel, stlbe);
854  preempt_enable();
855 }
856 
857 int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu)
858 {
859  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
860  struct kvm_book3e_206_tlb_entry *gtlbe, stlbe;
861  int tlbsel, esel, stlbsel, sesel;
862  int recal = 0;
863 
864  tlbsel = get_tlb_tlbsel(vcpu);
865  esel = get_tlb_esel(vcpu, tlbsel);
866 
867  gtlbe = get_entry(vcpu_e500, tlbsel, esel);
868 
869  if (get_tlb_v(gtlbe)) {
870  inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
871  if ((tlbsel == 1) &&
872  kvmppc_need_recalc_tlb1map_range(vcpu_e500, gtlbe))
873  recal = 1;
874  }
875 
876  gtlbe->mas1 = vcpu->arch.shared->mas1;
877  gtlbe->mas2 = vcpu->arch.shared->mas2;
878  gtlbe->mas7_3 = vcpu->arch.shared->mas7_3;
879 
880  trace_kvm_booke206_gtlb_write(vcpu->arch.shared->mas0, gtlbe->mas1,
881  gtlbe->mas2, gtlbe->mas7_3);
882 
883  if (tlbsel == 1) {
884  /*
885  * If a valid tlb1 entry is overwritten then recalculate the
886  * min/max TLB1 map address range otherwise no need to look
887  * in tlb1 array.
888  */
889  if (recal)
890  kvmppc_recalc_tlb1map_range(vcpu_e500);
891  else
892  kvmppc_set_tlb1map_range(vcpu, gtlbe);
893  }
894 
895  /* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
896  if (tlbe_is_host_safe(vcpu, gtlbe)) {
897  u64 eaddr;
898  u64 raddr;
899 
900  switch (tlbsel) {
901  case 0:
902  /* TLB0 */
903  gtlbe->mas1 &= ~MAS1_TSIZE(~0);
904  gtlbe->mas1 |= MAS1_TSIZE(BOOK3E_PAGESZ_4K);
905 
906  stlbsel = 0;
907  kvmppc_e500_tlb0_map(vcpu_e500, esel, &stlbe);
908  sesel = 0; /* unused */
909 
910  break;
911 
912  case 1:
913  /* TLB1 */
914  eaddr = get_tlb_eaddr(gtlbe);
915  raddr = get_tlb_raddr(gtlbe);
916 
917  /* Create a 4KB mapping on the host.
918  * If the guest wanted a large page,
919  * only the first 4KB is mapped here and the rest
920  * are mapped on the fly. */
921  stlbsel = 1;
922  sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr,
923  raddr >> PAGE_SHIFT, gtlbe, &stlbe, esel);
924  break;
925 
926  default:
927  BUG();
928  }
929 
930  write_stlbe(vcpu_e500, gtlbe, &stlbe, stlbsel, sesel);
931  }
932 
933  kvmppc_set_exit_type(vcpu, EMULATED_TLBWE_EXITS);
934  return EMULATE_DONE;
935 }
936 
937 static int kvmppc_e500_tlb_search(struct kvm_vcpu *vcpu,
938  gva_t eaddr, unsigned int pid, int as)
939 {
940  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
941  int esel, tlbsel;
942 
943  for (tlbsel = 0; tlbsel < 2; tlbsel++) {
944  esel = kvmppc_e500_tlb_index(vcpu_e500, eaddr, tlbsel, pid, as);
945  if (esel >= 0)
946  return index_of(tlbsel, esel);
947  }
948 
949  return -1;
950 }
951 
952 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
953 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
954  struct kvm_translation *tr)
955 {
956  int index;
957  gva_t eaddr;
958  u8 pid;
959  u8 as;
960 
961  eaddr = tr->linear_address;
962  pid = (tr->linear_address >> 32) & 0xff;
963  as = (tr->linear_address >> 40) & 0x1;
964 
965  index = kvmppc_e500_tlb_search(vcpu, eaddr, pid, as);
966  if (index < 0) {
967  tr->valid = 0;
968  return 0;
969  }
970 
971  tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
972  /* XXX what does "writeable" and "usermode" even mean? */
973  tr->valid = 1;
974 
975  return 0;
976 }
977 
978 
979 int kvmppc_mmu_itlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
980 {
981  unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);
982 
983  return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
984 }
985 
986 int kvmppc_mmu_dtlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
987 {
988  unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);
989 
990  return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
991 }
992 
993 void kvmppc_mmu_itlb_miss(struct kvm_vcpu *vcpu)
994 {
995  unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);
996 
997  kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.pc, as);
998 }
999 
1000 void kvmppc_mmu_dtlb_miss(struct kvm_vcpu *vcpu)
1001 {
1002  unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);
1003 
1004  kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.fault_dear, as);
1005 }
1006 
1007 gpa_t kvmppc_mmu_xlate(struct kvm_vcpu *vcpu, unsigned int index,
1008  gva_t eaddr)
1009 {
1010  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
1011  struct kvm_book3e_206_tlb_entry *gtlbe;
1012  u64 pgmask;
1013 
1014  gtlbe = get_entry(vcpu_e500, tlbsel_of(index), esel_of(index));
1015  pgmask = get_tlb_bytes(gtlbe) - 1;
1016 
1017  return get_tlb_raddr(gtlbe) | (eaddr & pgmask);
1018 }
1019 
1020 void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
1021 {
1022 }
1023 
1024 void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr,
1025  unsigned int index)
1026 {
1027  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
1028  struct tlbe_priv *priv;
1029  struct kvm_book3e_206_tlb_entry *gtlbe, stlbe;
1030  int tlbsel = tlbsel_of(index);
1031  int esel = esel_of(index);
1032  int stlbsel, sesel;
1033 
1034  gtlbe = get_entry(vcpu_e500, tlbsel, esel);
1035 
1036  switch (tlbsel) {
1037  case 0:
1038  stlbsel = 0;
1039  sesel = 0; /* unused */
1040  priv = &vcpu_e500->gtlb_priv[tlbsel][esel];
1041 
1042  kvmppc_e500_setup_stlbe(vcpu, gtlbe, BOOK3E_PAGESZ_4K,
1043  &priv->ref, eaddr, &stlbe);
1044  break;
1045 
1046  case 1: {
1047  gfn_t gfn = gpaddr >> PAGE_SHIFT;
1048 
1049  stlbsel = 1;
1050  sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr, gfn,
1051  gtlbe, &stlbe, esel);
1052  break;
1053  }
1054 
1055  default:
1056  BUG();
1057  break;
1058  }
1059 
1060  write_stlbe(vcpu_e500, gtlbe, &stlbe, stlbsel, sesel);
1061 }
1062 
1063 static void free_gtlb(struct kvmppc_vcpu_e500 *vcpu_e500)
1064 {
1065  int i;
1066 
1067  clear_tlb1_bitmap(vcpu_e500);
1068  kfree(vcpu_e500->g2h_tlb1_map);
1069 
1070  clear_tlb_refs(vcpu_e500);
1071  kfree(vcpu_e500->gtlb_priv[0]);
1072  kfree(vcpu_e500->gtlb_priv[1]);
1073 
1074  if (vcpu_e500->shared_tlb_pages) {
1075  vfree((void *)(round_down((uintptr_t)vcpu_e500->gtlb_arch,
1076  PAGE_SIZE)));
1077 
1078  for (i = 0; i < vcpu_e500->num_shared_tlb_pages; i++) {
1079  set_page_dirty_lock(vcpu_e500->shared_tlb_pages[i]);
1080  put_page(vcpu_e500->shared_tlb_pages[i]);
1081  }
1082 
1083  vcpu_e500->num_shared_tlb_pages = 0;
1084  vcpu_e500->shared_tlb_pages = NULL;
1085  } else {
1086  kfree(vcpu_e500->gtlb_arch);
1087  }
1088 
1089  vcpu_e500->gtlb_arch = NULL;
1090 }
1091 
1092 void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
1093 {
1094  sregs->u.e.mas0 = vcpu->arch.shared->mas0;
1095  sregs->u.e.mas1 = vcpu->arch.shared->mas1;
1096  sregs->u.e.mas2 = vcpu->arch.shared->mas2;
1097  sregs->u.e.mas7_3 = vcpu->arch.shared->mas7_3;
1098  sregs->u.e.mas4 = vcpu->arch.shared->mas4;
1099  sregs->u.e.mas6 = vcpu->arch.shared->mas6;
1100 
1101  sregs->u.e.mmucfg = vcpu->arch.mmucfg;
1102  sregs->u.e.tlbcfg[0] = vcpu->arch.tlbcfg[0];
1103  sregs->u.e.tlbcfg[1] = vcpu->arch.tlbcfg[1];
1104  sregs->u.e.tlbcfg[2] = 0;
1105  sregs->u.e.tlbcfg[3] = 0;
1106 }
1107 
1108 int kvmppc_set_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
1109 {
1110  if (sregs->u.e.features & KVM_SREGS_E_ARCH206_MMU) {
1111  vcpu->arch.shared->mas0 = sregs->u.e.mas0;
1112  vcpu->arch.shared->mas1 = sregs->u.e.mas1;
1113  vcpu->arch.shared->mas2 = sregs->u.e.mas2;
1114  vcpu->arch.shared->mas7_3 = sregs->u.e.mas7_3;
1115  vcpu->arch.shared->mas4 = sregs->u.e.mas4;
1116  vcpu->arch.shared->mas6 = sregs->u.e.mas6;
1117  }
1118 
1119  return 0;
1120 }
1121 
1122 int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu,
1123  struct kvm_config_tlb *cfg)
1124 {
1125  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
1126  struct kvm_book3e_206_tlb_params params;
1127  char *virt;
1128  struct page **pages;
1129  struct tlbe_priv *privs[2] = {};
1130  u64 *g2h_bitmap = NULL;
1131  size_t array_len;
1132  u32 sets;
1133  int num_pages, ret, i;
1134 
1135  if (cfg->mmu_type != KVM_MMU_FSL_BOOKE_NOHV)
1136  return -EINVAL;
1137 
1138  if (copy_from_user(&params, (void __user *)(uintptr_t)cfg->params,
1139  sizeof(params)))
1140  return -EFAULT;
1141 
1142  if (params.tlb_sizes[1] > 64)
1143  return -EINVAL;
1144  if (params.tlb_ways[1] != params.tlb_sizes[1])
1145  return -EINVAL;
1146  if (params.tlb_sizes[2] != 0 || params.tlb_sizes[3] != 0)
1147  return -EINVAL;
1148  if (params.tlb_ways[2] != 0 || params.tlb_ways[3] != 0)
1149  return -EINVAL;
1150 
1151  if (!is_power_of_2(params.tlb_ways[0]))
1152  return -EINVAL;
1153 
1154  sets = params.tlb_sizes[0] >> ilog2(params.tlb_ways[0]);
1155  if (!is_power_of_2(sets))
1156  return -EINVAL;
1157 
1158  array_len = params.tlb_sizes[0] + params.tlb_sizes[1];
1159  array_len *= sizeof(struct kvm_book3e_206_tlb_entry);
1160 
1161  if (cfg->array_len < array_len)
1162  return -EINVAL;
1163 
1164  num_pages = DIV_ROUND_UP(cfg->array + array_len - 1, PAGE_SIZE) -
1165  cfg->array / PAGE_SIZE;
1166  pages = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL);
1167  if (!pages)
1168  return -ENOMEM;
1169 
1170  ret = get_user_pages_fast(cfg->array, num_pages, 1, pages);
1171  if (ret < 0)
1172  goto err_pages;
1173 
1174  if (ret != num_pages) {
1175  num_pages = ret;
1176  ret = -EFAULT;
1177  goto err_put_page;
1178  }
1179 
1180  virt = vmap(pages, num_pages, VM_MAP, PAGE_KERNEL);
1181  if (!virt)
1182  goto err_put_page;
1183 
1184  privs[0] = kzalloc(sizeof(struct tlbe_priv) * params.tlb_sizes[0],
1185  GFP_KERNEL);
1186  privs[1] = kzalloc(sizeof(struct tlbe_priv) * params.tlb_sizes[1],
1187  GFP_KERNEL);
1188 
1189  if (!privs[0] || !privs[1])
1190  goto err_put_page;
1191 
1192  g2h_bitmap = kzalloc(sizeof(u64) * params.tlb_sizes[1],
1193  GFP_KERNEL);
1194  if (!g2h_bitmap)
1195  goto err_put_page;
1196 
1197  free_gtlb(vcpu_e500);
1198 
1199  vcpu_e500->gtlb_priv[0] = privs[0];
1200  vcpu_e500->gtlb_priv[1] = privs[1];
1201  vcpu_e500->g2h_tlb1_map = g2h_bitmap;
1202 
1203  vcpu_e500->gtlb_arch = (struct kvm_book3e_206_tlb_entry *)
1204  (virt + (cfg->array & (PAGE_SIZE - 1)));
1205 
1206  vcpu_e500->gtlb_params[0].entries = params.tlb_sizes[0];
1207  vcpu_e500->gtlb_params[1].entries = params.tlb_sizes[1];
1208 
1209  vcpu_e500->gtlb_offset[0] = 0;
1210  vcpu_e500->gtlb_offset[1] = params.tlb_sizes[0];
1211 
1212  vcpu->arch.mmucfg = mfspr(SPRN_MMUCFG) & ~MMUCFG_LPIDSIZE;
1213 
1214  vcpu->arch.tlbcfg[0] &= ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
1215  if (params.tlb_sizes[0] <= 2048)
1216  vcpu->arch.tlbcfg[0] |= params.tlb_sizes[0];
1217  vcpu->arch.tlbcfg[0] |= params.tlb_ways[0] << TLBnCFG_ASSOC_SHIFT;
1218 
1219  vcpu->arch.tlbcfg[1] &= ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
1220  vcpu->arch.tlbcfg[1] |= params.tlb_sizes[1];
1221  vcpu->arch.tlbcfg[1] |= params.tlb_ways[1] << TLBnCFG_ASSOC_SHIFT;
1222 
1223  vcpu_e500->shared_tlb_pages = pages;
1224  vcpu_e500->num_shared_tlb_pages = num_pages;
1225 
1226  vcpu_e500->gtlb_params[0].ways = params.tlb_ways[0];
1227  vcpu_e500->gtlb_params[0].sets = sets;
1228 
1229  vcpu_e500->gtlb_params[1].ways = params.tlb_sizes[1];
1230  vcpu_e500->gtlb_params[1].sets = 1;
1231 
1232  kvmppc_recalc_tlb1map_range(vcpu_e500);
1233  return 0;
1234 
1235 err_put_page:
1236  kfree(privs[0]);
1237  kfree(privs[1]);
1238 
1239  for (i = 0; i < num_pages; i++)
1240  put_page(pages[i]);
1241 
1242 err_pages:
1243  kfree(pages);
1244  return ret;
1245 }
1246 
1247 int kvm_vcpu_ioctl_dirty_tlb(struct kvm_vcpu *vcpu,
1248  struct kvm_dirty_tlb *dirty)
1249 {
1250  struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
1251  kvmppc_recalc_tlb1map_range(vcpu_e500);
1252  clear_tlb_refs(vcpu_e500);
1253  return 0;
1254 }
1255 
1256 int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
1257 {
1258  struct kvm_vcpu *vcpu = &vcpu_e500->vcpu;
1259  int entry_size = sizeof(struct kvm_book3e_206_tlb_entry);
1260  int entries = KVM_E500_TLB0_SIZE + KVM_E500_TLB1_SIZE;
1261 
1262  host_tlb_params[0].entries = mfspr(SPRN_TLB0CFG) & TLBnCFG_N_ENTRY;
1263  host_tlb_params[1].entries = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
1264 
1265  /*
1266  * This should never happen on real e500 hardware, but is
1267  * architecturally possible -- e.g. in some weird nested
1268  * virtualization case.
1269  */
1270  if (host_tlb_params[0].entries == 0 ||
1271  host_tlb_params[1].entries == 0) {
1272  pr_err("%s: need to know host tlb size\n", __func__);
1273  return -ENODEV;
1274  }
1275 
1276  host_tlb_params[0].ways = (mfspr(SPRN_TLB0CFG) & TLBnCFG_ASSOC) >>
1277  TLBnCFG_ASSOC_SHIFT;
1278  host_tlb_params[1].ways = host_tlb_params[1].entries;
1279 
1280  if (!is_power_of_2(host_tlb_params[0].entries) ||
1281  !is_power_of_2(host_tlb_params[0].ways) ||
1282  host_tlb_params[0].entries < host_tlb_params[0].ways ||
1283  host_tlb_params[0].ways == 0) {
1284  pr_err("%s: bad tlb0 host config: %u entries %u ways\n",
1285  __func__, host_tlb_params[0].entries,
1286  host_tlb_params[0].ways);
1287  return -ENODEV;
1288  }
1289 
1290  host_tlb_params[0].sets =
1291  host_tlb_params[0].entries / host_tlb_params[0].ways;
1292  host_tlb_params[1].sets = 1;
1293 
1294  vcpu_e500->gtlb_params[0].entries = KVM_E500_TLB0_SIZE;
1295  vcpu_e500->gtlb_params[1].entries = KVM_E500_TLB1_SIZE;
1296 
1297  vcpu_e500->gtlb_params[0].ways = KVM_E500_TLB0_WAY_NUM;
1298  vcpu_e500->gtlb_params[0].sets =
1299  KVM_E500_TLB0_SIZE / KVM_E500_TLB0_WAY_NUM;
1300 
1301  vcpu_e500->gtlb_params[1].ways = KVM_E500_TLB1_SIZE;
1302  vcpu_e500->gtlb_params[1].sets = 1;
1303 
1304  vcpu_e500->gtlb_arch = kmalloc(entries * entry_size, GFP_KERNEL);
1305  if (!vcpu_e500->gtlb_arch)
1306  return -ENOMEM;
1307 
1308  vcpu_e500->gtlb_offset[0] = 0;
1309  vcpu_e500->gtlb_offset[1] = KVM_E500_TLB0_SIZE;
1310 
1311  vcpu_e500->tlb_refs[0] =
1312  kzalloc(sizeof(struct tlbe_ref) * host_tlb_params[0].entries,
1313  GFP_KERNEL);
1314  if (!vcpu_e500->tlb_refs[0])
1315  goto err;
1316 
1317  vcpu_e500->tlb_refs[1] =
1318  kzalloc(sizeof(struct tlbe_ref) * host_tlb_params[1].entries,
1319  GFP_KERNEL);
1320  if (!vcpu_e500->tlb_refs[1])
1321  goto err;
1322 
1323  vcpu_e500->gtlb_priv[0] = kzalloc(sizeof(struct tlbe_ref) *
1324  vcpu_e500->gtlb_params[0].entries,
1325  GFP_KERNEL);
1326  if (!vcpu_e500->gtlb_priv[0])
1327  goto err;
1328 
1329  vcpu_e500->gtlb_priv[1] = kzalloc(sizeof(struct tlbe_ref) *
1330  vcpu_e500->gtlb_params[1].entries,
1331  GFP_KERNEL);
1332  if (!vcpu_e500->gtlb_priv[1])
1333  goto err;
1334 
1335  vcpu_e500->g2h_tlb1_map = kzalloc(sizeof(unsigned int) *
1336  vcpu_e500->gtlb_params[1].entries,
1337  GFP_KERNEL);
1338  if (!vcpu_e500->g2h_tlb1_map)
1339  goto err;
1340 
1341  vcpu_e500->h2g_tlb1_rmap = kzalloc(sizeof(unsigned int) *
1342  host_tlb_params[1].entries,
1343  GFP_KERNEL);
1344  if (!vcpu_e500->h2g_tlb1_rmap)
1345  goto err;
1346 
1347  /* Init TLB configuration register */
1348  vcpu->arch.tlbcfg[0] = mfspr(SPRN_TLB0CFG) &
1349  ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
1350  vcpu->arch.tlbcfg[0] |= vcpu_e500->gtlb_params[0].entries;
1351  vcpu->arch.tlbcfg[0] |=
1352  vcpu_e500->gtlb_params[0].ways << TLBnCFG_ASSOC_SHIFT;
1353 
1354  vcpu->arch.tlbcfg[1] = mfspr(SPRN_TLB1CFG) &
1355  ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
1356  vcpu->arch.tlbcfg[1] |= vcpu_e500->gtlb_params[1].entries;
1357  vcpu->arch.tlbcfg[1] |=
1358  vcpu_e500->gtlb_params[1].ways << TLBnCFG_ASSOC_SHIFT;
1359 
1360  kvmppc_recalc_tlb1map_range(vcpu_e500);
1361  return 0;
1362 
1363 err:
1364  free_gtlb(vcpu_e500);
1365  kfree(vcpu_e500->tlb_refs[0]);
1366  kfree(vcpu_e500->tlb_refs[1]);
1367  return -1;
1368 }
1369 
1370 void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500)
1371 {
1372  free_gtlb(vcpu_e500);
1373  kfree(vcpu_e500->h2g_tlb1_rmap);
1374  kfree(vcpu_e500->tlb_refs[0]);
1375  kfree(vcpu_e500->tlb_refs[1]);
1376 }
Generated on Thu Jan 10 2013 13:14:10 for Linux Kernel by   doxygen 1.8.2