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TOMOYO Linux Cross Reference
Linux/arch/powerpc/kvm/e500_mmu_host.c

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  1 /*
  2  * Copyright (C) 2008-2013 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  *         Alexander Graf, agraf@suse.de
  9  *
 10  * Description:
 11  * This file is based on arch/powerpc/kvm/44x_tlb.c,
 12  * by Hollis Blanchard <hollisb@us.ibm.com>.
 13  *
 14  * This program is free software; you can redistribute it and/or modify
 15  * it under the terms of the GNU General Public License, version 2, as
 16  * published by the Free Software Foundation.
 17  */
 18 
 19 #include <linux/kernel.h>
 20 #include <linux/types.h>
 21 #include <linux/slab.h>
 22 #include <linux/string.h>
 23 #include <linux/kvm.h>
 24 #include <linux/kvm_host.h>
 25 #include <linux/highmem.h>
 26 #include <linux/log2.h>
 27 #include <linux/uaccess.h>
 28 #include <linux/sched.h>
 29 #include <linux/rwsem.h>
 30 #include <linux/vmalloc.h>
 31 #include <linux/hugetlb.h>
 32 #include <asm/kvm_ppc.h>
 33 
 34 #include "e500.h"
 35 #include "trace.h"
 36 #include "timing.h"
 37 #include "e500_mmu_host.h"
 38 
 39 #define to_htlb1_esel(esel) (host_tlb_params[1].entries - (esel) - 1)
 40 
 41 static struct kvmppc_e500_tlb_params host_tlb_params[E500_TLB_NUM];
 42 
 43 static inline unsigned int tlb1_max_shadow_size(void)
 44 {
 45         /* reserve one entry for magic page */
 46         return host_tlb_params[1].entries - tlbcam_index - 1;
 47 }
 48 
 49 static inline u32 e500_shadow_mas3_attrib(u32 mas3, int usermode)
 50 {
 51         /* Mask off reserved bits. */
 52         mas3 &= MAS3_ATTRIB_MASK;
 53 
 54 #ifndef CONFIG_KVM_BOOKE_HV
 55         if (!usermode) {
 56                 /* Guest is in supervisor mode,
 57                  * so we need to translate guest
 58                  * supervisor permissions into user permissions. */
 59                 mas3 &= ~E500_TLB_USER_PERM_MASK;
 60                 mas3 |= (mas3 & E500_TLB_SUPER_PERM_MASK) << 1;
 61         }
 62         mas3 |= E500_TLB_SUPER_PERM_MASK;
 63 #endif
 64         return mas3;
 65 }
 66 
 67 static inline u32 e500_shadow_mas2_attrib(u32 mas2, int usermode)
 68 {
 69 #ifdef CONFIG_SMP
 70         return (mas2 & MAS2_ATTRIB_MASK) | MAS2_M;
 71 #else
 72         return mas2 & MAS2_ATTRIB_MASK;
 73 #endif
 74 }
 75 
 76 /*
 77  * writing shadow tlb entry to host TLB
 78  */
 79 static inline void __write_host_tlbe(struct kvm_book3e_206_tlb_entry *stlbe,
 80                                      uint32_t mas0)
 81 {
 82         unsigned long flags;
 83 
 84         local_irq_save(flags);
 85         mtspr(SPRN_MAS0, mas0);
 86         mtspr(SPRN_MAS1, stlbe->mas1);
 87         mtspr(SPRN_MAS2, (unsigned long)stlbe->mas2);
 88         mtspr(SPRN_MAS3, (u32)stlbe->mas7_3);
 89         mtspr(SPRN_MAS7, (u32)(stlbe->mas7_3 >> 32));
 90 #ifdef CONFIG_KVM_BOOKE_HV
 91         mtspr(SPRN_MAS8, stlbe->mas8);
 92 #endif
 93         asm volatile("isync; tlbwe" : : : "memory");
 94 
 95 #ifdef CONFIG_KVM_BOOKE_HV
 96         /* Must clear mas8 for other host tlbwe's */
 97         mtspr(SPRN_MAS8, 0);
 98         isync();
 99 #endif
100         local_irq_restore(flags);
101 
102         trace_kvm_booke206_stlb_write(mas0, stlbe->mas8, stlbe->mas1,
103                                       stlbe->mas2, stlbe->mas7_3);
104 }
105 
106 /*
107  * Acquire a mas0 with victim hint, as if we just took a TLB miss.
108  *
109  * We don't care about the address we're searching for, other than that it's
110  * in the right set and is not present in the TLB.  Using a zero PID and a
111  * userspace address means we don't have to set and then restore MAS5, or
112  * calculate a proper MAS6 value.
113  */
114 static u32 get_host_mas0(unsigned long eaddr)
115 {
116         unsigned long flags;
117         u32 mas0;
118 
119         local_irq_save(flags);
120         mtspr(SPRN_MAS6, 0);
121         asm volatile("tlbsx 0, %0" : : "b" (eaddr & ~CONFIG_PAGE_OFFSET));
122         mas0 = mfspr(SPRN_MAS0);
123         local_irq_restore(flags);
124 
125         return mas0;
126 }
127 
128 /* sesel is for tlb1 only */
129 static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
130                 int tlbsel, int sesel, struct kvm_book3e_206_tlb_entry *stlbe)
131 {
132         u32 mas0;
133 
134         if (tlbsel == 0) {
135                 mas0 = get_host_mas0(stlbe->mas2);
136                 __write_host_tlbe(stlbe, mas0);
137         } else {
138                 __write_host_tlbe(stlbe,
139                                   MAS0_TLBSEL(1) |
140                                   MAS0_ESEL(to_htlb1_esel(sesel)));
141         }
142 }
143 
144 /* sesel is for tlb1 only */
145 static void write_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
146                         struct kvm_book3e_206_tlb_entry *gtlbe,
147                         struct kvm_book3e_206_tlb_entry *stlbe,
148                         int stlbsel, int sesel)
149 {
150         int stid;
151 
152         preempt_disable();
153         stid = kvmppc_e500_get_tlb_stid(&vcpu_e500->vcpu, gtlbe);
154 
155         stlbe->mas1 |= MAS1_TID(stid);
156         write_host_tlbe(vcpu_e500, stlbsel, sesel, stlbe);
157         preempt_enable();
158 }
159 
160 #ifdef CONFIG_KVM_E500V2
161 /* XXX should be a hook in the gva2hpa translation */
162 void kvmppc_map_magic(struct kvm_vcpu *vcpu)
163 {
164         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
165         struct kvm_book3e_206_tlb_entry magic;
166         ulong shared_page = ((ulong)vcpu->arch.shared) & PAGE_MASK;
167         unsigned int stid;
168         pfn_t pfn;
169 
170         pfn = (pfn_t)virt_to_phys((void *)shared_page) >> PAGE_SHIFT;
171         get_page(pfn_to_page(pfn));
172 
173         preempt_disable();
174         stid = kvmppc_e500_get_sid(vcpu_e500, 0, 0, 0, 0);
175 
176         magic.mas1 = MAS1_VALID | MAS1_TS | MAS1_TID(stid) |
177                      MAS1_TSIZE(BOOK3E_PAGESZ_4K);
178         magic.mas2 = vcpu->arch.magic_page_ea | MAS2_M;
179         magic.mas7_3 = ((u64)pfn << PAGE_SHIFT) |
180                        MAS3_SW | MAS3_SR | MAS3_UW | MAS3_UR;
181         magic.mas8 = 0;
182 
183         __write_host_tlbe(&magic, MAS0_TLBSEL(1) | MAS0_ESEL(tlbcam_index));
184         preempt_enable();
185 }
186 #endif
187 
188 void inval_gtlbe_on_host(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel,
189                          int esel)
190 {
191         struct kvm_book3e_206_tlb_entry *gtlbe =
192                 get_entry(vcpu_e500, tlbsel, esel);
193         struct tlbe_ref *ref = &vcpu_e500->gtlb_priv[tlbsel][esel].ref;
194 
195         /* Don't bother with unmapped entries */
196         if (!(ref->flags & E500_TLB_VALID)) {
197                 WARN(ref->flags & (E500_TLB_BITMAP | E500_TLB_TLB0),
198                      "%s: flags %x\n", __func__, ref->flags);
199                 WARN_ON(tlbsel == 1 && vcpu_e500->g2h_tlb1_map[esel]);
200         }
201 
202         if (tlbsel == 1 && ref->flags & E500_TLB_BITMAP) {
203                 u64 tmp = vcpu_e500->g2h_tlb1_map[esel];
204                 int hw_tlb_indx;
205                 unsigned long flags;
206 
207                 local_irq_save(flags);
208                 while (tmp) {
209                         hw_tlb_indx = __ilog2_u64(tmp & -tmp);
210                         mtspr(SPRN_MAS0,
211                               MAS0_TLBSEL(1) |
212                               MAS0_ESEL(to_htlb1_esel(hw_tlb_indx)));
213                         mtspr(SPRN_MAS1, 0);
214                         asm volatile("tlbwe");
215                         vcpu_e500->h2g_tlb1_rmap[hw_tlb_indx] = 0;
216                         tmp &= tmp - 1;
217                 }
218                 mb();
219                 vcpu_e500->g2h_tlb1_map[esel] = 0;
220                 ref->flags &= ~(E500_TLB_BITMAP | E500_TLB_VALID);
221                 local_irq_restore(flags);
222         }
223 
224         if (tlbsel == 1 && ref->flags & E500_TLB_TLB0) {
225                 /*
226                  * TLB1 entry is backed by 4k pages. This should happen
227                  * rarely and is not worth optimizing. Invalidate everything.
228                  */
229                 kvmppc_e500_tlbil_all(vcpu_e500);
230                 ref->flags &= ~(E500_TLB_TLB0 | E500_TLB_VALID);
231         }
232 
233         /* Already invalidated in between */
234         if (!(ref->flags & E500_TLB_VALID))
235                 return;
236 
237         /* Guest tlbe is backed by at most one host tlbe per shadow pid. */
238         kvmppc_e500_tlbil_one(vcpu_e500, gtlbe);
239 
240         /* Mark the TLB as not backed by the host anymore */
241         ref->flags &= ~E500_TLB_VALID;
242 }
243 
244 static inline int tlbe_is_writable(struct kvm_book3e_206_tlb_entry *tlbe)
245 {
246         return tlbe->mas7_3 & (MAS3_SW|MAS3_UW);
247 }
248 
249 static inline void kvmppc_e500_ref_setup(struct tlbe_ref *ref,
250                                          struct kvm_book3e_206_tlb_entry *gtlbe,
251                                          pfn_t pfn)
252 {
253         ref->pfn = pfn;
254         ref->flags |= E500_TLB_VALID;
255 
256         if (tlbe_is_writable(gtlbe))
257                 kvm_set_pfn_dirty(pfn);
258 }
259 
260 static inline void kvmppc_e500_ref_release(struct tlbe_ref *ref)
261 {
262         if (ref->flags & E500_TLB_VALID) {
263                 /* FIXME: don't log bogus pfn for TLB1 */
264                 trace_kvm_booke206_ref_release(ref->pfn, ref->flags);
265                 ref->flags = 0;
266         }
267 }
268 
269 static void clear_tlb1_bitmap(struct kvmppc_vcpu_e500 *vcpu_e500)
270 {
271         if (vcpu_e500->g2h_tlb1_map)
272                 memset(vcpu_e500->g2h_tlb1_map, 0,
273                        sizeof(u64) * vcpu_e500->gtlb_params[1].entries);
274         if (vcpu_e500->h2g_tlb1_rmap)
275                 memset(vcpu_e500->h2g_tlb1_rmap, 0,
276                        sizeof(unsigned int) * host_tlb_params[1].entries);
277 }
278 
279 static void clear_tlb_privs(struct kvmppc_vcpu_e500 *vcpu_e500)
280 {
281         int tlbsel;
282         int i;
283 
284         for (tlbsel = 0; tlbsel <= 1; tlbsel++) {
285                 for (i = 0; i < vcpu_e500->gtlb_params[tlbsel].entries; i++) {
286                         struct tlbe_ref *ref =
287                                 &vcpu_e500->gtlb_priv[tlbsel][i].ref;
288                         kvmppc_e500_ref_release(ref);
289                 }
290         }
291 }
292 
293 void kvmppc_core_flush_tlb(struct kvm_vcpu *vcpu)
294 {
295         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
296         kvmppc_e500_tlbil_all(vcpu_e500);
297         clear_tlb_privs(vcpu_e500);
298         clear_tlb1_bitmap(vcpu_e500);
299 }
300 
301 /* TID must be supplied by the caller */
302 static void kvmppc_e500_setup_stlbe(
303         struct kvm_vcpu *vcpu,
304         struct kvm_book3e_206_tlb_entry *gtlbe,
305         int tsize, struct tlbe_ref *ref, u64 gvaddr,
306         struct kvm_book3e_206_tlb_entry *stlbe)
307 {
308         pfn_t pfn = ref->pfn;
309         u32 pr = vcpu->arch.shared->msr & MSR_PR;
310 
311         BUG_ON(!(ref->flags & E500_TLB_VALID));
312 
313         /* Force IPROT=0 for all guest mappings. */
314         stlbe->mas1 = MAS1_TSIZE(tsize) | get_tlb_sts(gtlbe) | MAS1_VALID;
315         stlbe->mas2 = (gvaddr & MAS2_EPN) |
316                       e500_shadow_mas2_attrib(gtlbe->mas2, pr);
317         stlbe->mas7_3 = ((u64)pfn << PAGE_SHIFT) |
318                         e500_shadow_mas3_attrib(gtlbe->mas7_3, pr);
319 
320 #ifdef CONFIG_KVM_BOOKE_HV
321         stlbe->mas8 = MAS8_TGS | vcpu->kvm->arch.lpid;
322 #endif
323 }
324 
325 static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
326         u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe,
327         int tlbsel, struct kvm_book3e_206_tlb_entry *stlbe,
328         struct tlbe_ref *ref)
329 {
330         struct kvm_memory_slot *slot;
331         unsigned long pfn = 0; /* silence GCC warning */
332         unsigned long hva;
333         int pfnmap = 0;
334         int tsize = BOOK3E_PAGESZ_4K;
335 
336         /*
337          * Translate guest physical to true physical, acquiring
338          * a page reference if it is normal, non-reserved memory.
339          *
340          * gfn_to_memslot() must succeed because otherwise we wouldn't
341          * have gotten this far.  Eventually we should just pass the slot
342          * pointer through from the first lookup.
343          */
344         slot = gfn_to_memslot(vcpu_e500->vcpu.kvm, gfn);
345         hva = gfn_to_hva_memslot(slot, gfn);
346 
347         if (tlbsel == 1) {
348                 struct vm_area_struct *vma;
349                 down_read(&current->mm->mmap_sem);
350 
351                 vma = find_vma(current->mm, hva);
352                 if (vma && hva >= vma->vm_start &&
353                     (vma->vm_flags & VM_PFNMAP)) {
354                         /*
355                          * This VMA is a physically contiguous region (e.g.
356                          * /dev/mem) that bypasses normal Linux page
357                          * management.  Find the overlap between the
358                          * vma and the memslot.
359                          */
360 
361                         unsigned long start, end;
362                         unsigned long slot_start, slot_end;
363 
364                         pfnmap = 1;
365 
366                         start = vma->vm_pgoff;
367                         end = start +
368                               ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
369 
370                         pfn = start + ((hva - vma->vm_start) >> PAGE_SHIFT);
371 
372                         slot_start = pfn - (gfn - slot->base_gfn);
373                         slot_end = slot_start + slot->npages;
374 
375                         if (start < slot_start)
376                                 start = slot_start;
377                         if (end > slot_end)
378                                 end = slot_end;
379 
380                         tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >>
381                                 MAS1_TSIZE_SHIFT;
382 
383                         /*
384                          * e500 doesn't implement the lowest tsize bit,
385                          * or 1K pages.
386                          */
387                         tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1);
388 
389                         /*
390                          * Now find the largest tsize (up to what the guest
391                          * requested) that will cover gfn, stay within the
392                          * range, and for which gfn and pfn are mutually
393                          * aligned.
394                          */
395 
396                         for (; tsize > BOOK3E_PAGESZ_4K; tsize -= 2) {
397                                 unsigned long gfn_start, gfn_end, tsize_pages;
398                                 tsize_pages = 1 << (tsize - 2);
399 
400                                 gfn_start = gfn & ~(tsize_pages - 1);
401                                 gfn_end = gfn_start + tsize_pages;
402 
403                                 if (gfn_start + pfn - gfn < start)
404                                         continue;
405                                 if (gfn_end + pfn - gfn > end)
406                                         continue;
407                                 if ((gfn & (tsize_pages - 1)) !=
408                                     (pfn & (tsize_pages - 1)))
409                                         continue;
410 
411                                 gvaddr &= ~((tsize_pages << PAGE_SHIFT) - 1);
412                                 pfn &= ~(tsize_pages - 1);
413                                 break;
414                         }
415                 } else if (vma && hva >= vma->vm_start &&
416                            (vma->vm_flags & VM_HUGETLB)) {
417                         unsigned long psize = vma_kernel_pagesize(vma);
418 
419                         tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >>
420                                 MAS1_TSIZE_SHIFT;
421 
422                         /*
423                          * Take the largest page size that satisfies both host
424                          * and guest mapping
425                          */
426                         tsize = min(__ilog2(psize) - 10, tsize);
427 
428                         /*
429                          * e500 doesn't implement the lowest tsize bit,
430                          * or 1K pages.
431                          */
432                         tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1);
433                 }
434 
435                 up_read(&current->mm->mmap_sem);
436         }
437 
438         if (likely(!pfnmap)) {
439                 unsigned long tsize_pages = 1 << (tsize + 10 - PAGE_SHIFT);
440                 pfn = gfn_to_pfn_memslot(slot, gfn);
441                 if (is_error_noslot_pfn(pfn)) {
442                         printk(KERN_ERR "Couldn't get real page for gfn %lx!\n",
443                                         (long)gfn);
444                         return -EINVAL;
445                 }
446 
447                 /* Align guest and physical address to page map boundaries */
448                 pfn &= ~(tsize_pages - 1);
449                 gvaddr &= ~((tsize_pages << PAGE_SHIFT) - 1);
450         }
451 
452         kvmppc_e500_ref_setup(ref, gtlbe, pfn);
453 
454         kvmppc_e500_setup_stlbe(&vcpu_e500->vcpu, gtlbe, tsize,
455                                 ref, gvaddr, stlbe);
456 
457         /* Clear i-cache for new pages */
458         kvmppc_mmu_flush_icache(pfn);
459 
460         /* Drop refcount on page, so that mmu notifiers can clear it */
461         kvm_release_pfn_clean(pfn);
462 
463         return 0;
464 }
465 
466 /* XXX only map the one-one case, for now use TLB0 */
467 static int kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, int esel,
468                                 struct kvm_book3e_206_tlb_entry *stlbe)
469 {
470         struct kvm_book3e_206_tlb_entry *gtlbe;
471         struct tlbe_ref *ref;
472         int stlbsel = 0;
473         int sesel = 0;
474         int r;
475 
476         gtlbe = get_entry(vcpu_e500, 0, esel);
477         ref = &vcpu_e500->gtlb_priv[0][esel].ref;
478 
479         r = kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe),
480                         get_tlb_raddr(gtlbe) >> PAGE_SHIFT,
481                         gtlbe, 0, stlbe, ref);
482         if (r)
483                 return r;
484 
485         write_stlbe(vcpu_e500, gtlbe, stlbe, stlbsel, sesel);
486 
487         return 0;
488 }
489 
490 static int kvmppc_e500_tlb1_map_tlb1(struct kvmppc_vcpu_e500 *vcpu_e500,
491                                      struct tlbe_ref *ref,
492                                      int esel)
493 {
494         unsigned int sesel = vcpu_e500->host_tlb1_nv++;
495 
496         if (unlikely(vcpu_e500->host_tlb1_nv >= tlb1_max_shadow_size()))
497                 vcpu_e500->host_tlb1_nv = 0;
498 
499         if (vcpu_e500->h2g_tlb1_rmap[sesel]) {
500                 unsigned int idx = vcpu_e500->h2g_tlb1_rmap[sesel] - 1;
501                 vcpu_e500->g2h_tlb1_map[idx] &= ~(1ULL << sesel);
502         }
503 
504         vcpu_e500->gtlb_priv[1][esel].ref.flags |= E500_TLB_BITMAP;
505         vcpu_e500->g2h_tlb1_map[esel] |= (u64)1 << sesel;
506         vcpu_e500->h2g_tlb1_rmap[sesel] = esel + 1;
507         WARN_ON(!(ref->flags & E500_TLB_VALID));
508 
509         return sesel;
510 }
511 
512 /* Caller must ensure that the specified guest TLB entry is safe to insert into
513  * the shadow TLB. */
514 /* For both one-one and one-to-many */
515 static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500,
516                 u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe,
517                 struct kvm_book3e_206_tlb_entry *stlbe, int esel)
518 {
519         struct tlbe_ref *ref = &vcpu_e500->gtlb_priv[1][esel].ref;
520         int sesel;
521         int r;
522 
523         r = kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, stlbe,
524                                    ref);
525         if (r)
526                 return r;
527 
528         /* Use TLB0 when we can only map a page with 4k */
529         if (get_tlb_tsize(stlbe) == BOOK3E_PAGESZ_4K) {
530                 vcpu_e500->gtlb_priv[1][esel].ref.flags |= E500_TLB_TLB0;
531                 write_stlbe(vcpu_e500, gtlbe, stlbe, 0, 0);
532                 return 0;
533         }
534 
535         /* Otherwise map into TLB1 */
536         sesel = kvmppc_e500_tlb1_map_tlb1(vcpu_e500, ref, esel);
537         write_stlbe(vcpu_e500, gtlbe, stlbe, 1, sesel);
538 
539         return 0;
540 }
541 
542 void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr,
543                     unsigned int index)
544 {
545         struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
546         struct tlbe_priv *priv;
547         struct kvm_book3e_206_tlb_entry *gtlbe, stlbe;
548         int tlbsel = tlbsel_of(index);
549         int esel = esel_of(index);
550 
551         gtlbe = get_entry(vcpu_e500, tlbsel, esel);
552 
553         switch (tlbsel) {
554         case 0:
555                 priv = &vcpu_e500->gtlb_priv[tlbsel][esel];
556 
557                 /* Triggers after clear_tlb_privs or on initial mapping */
558                 if (!(priv->ref.flags & E500_TLB_VALID)) {
559                         kvmppc_e500_tlb0_map(vcpu_e500, esel, &stlbe);
560                 } else {
561                         kvmppc_e500_setup_stlbe(vcpu, gtlbe, BOOK3E_PAGESZ_4K,
562                                                 &priv->ref, eaddr, &stlbe);
563                         write_stlbe(vcpu_e500, gtlbe, &stlbe, 0, 0);
564                 }
565                 break;
566 
567         case 1: {
568                 gfn_t gfn = gpaddr >> PAGE_SHIFT;
569                 kvmppc_e500_tlb1_map(vcpu_e500, eaddr, gfn, gtlbe, &stlbe,
570                                      esel);
571                 break;
572         }
573 
574         default:
575                 BUG();
576                 break;
577         }
578 }
579 
580 /************* MMU Notifiers *************/
581 
582 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
583 {
584         trace_kvm_unmap_hva(hva);
585 
586         /*
587          * Flush all shadow tlb entries everywhere. This is slow, but
588          * we are 100% sure that we catch the to be unmapped page
589          */
590         kvm_flush_remote_tlbs(kvm);
591 
592         return 0;
593 }
594 
595 int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
596 {
597         /* kvm_unmap_hva flushes everything anyways */
598         kvm_unmap_hva(kvm, start);
599 
600         return 0;
601 }
602 
603 int kvm_age_hva(struct kvm *kvm, unsigned long hva)
604 {
605         /* XXX could be more clever ;) */
606         return 0;
607 }
608 
609 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
610 {
611         /* XXX could be more clever ;) */
612         return 0;
613 }
614 
615 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
616 {
617         /* The page will get remapped properly on its next fault */
618         kvm_unmap_hva(kvm, hva);
619 }
620 
621 /*****************************************/
622 
623 int e500_mmu_host_init(struct kvmppc_vcpu_e500 *vcpu_e500)
624 {
625         host_tlb_params[0].entries = mfspr(SPRN_TLB0CFG) & TLBnCFG_N_ENTRY;
626         host_tlb_params[1].entries = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
627 
628         /*
629          * This should never happen on real e500 hardware, but is
630          * architecturally possible -- e.g. in some weird nested
631          * virtualization case.
632          */
633         if (host_tlb_params[0].entries == 0 ||
634             host_tlb_params[1].entries == 0) {
635                 pr_err("%s: need to know host tlb size\n", __func__);
636                 return -ENODEV;
637         }
638 
639         host_tlb_params[0].ways = (mfspr(SPRN_TLB0CFG) & TLBnCFG_ASSOC) >>
640                                   TLBnCFG_ASSOC_SHIFT;
641         host_tlb_params[1].ways = host_tlb_params[1].entries;
642 
643         if (!is_power_of_2(host_tlb_params[0].entries) ||
644             !is_power_of_2(host_tlb_params[0].ways) ||
645             host_tlb_params[0].entries < host_tlb_params[0].ways ||
646             host_tlb_params[0].ways == 0) {
647                 pr_err("%s: bad tlb0 host config: %u entries %u ways\n",
648                        __func__, host_tlb_params[0].entries,
649                        host_tlb_params[0].ways);
650                 return -ENODEV;
651         }
652 
653         host_tlb_params[0].sets =
654                 host_tlb_params[0].entries / host_tlb_params[0].ways;
655         host_tlb_params[1].sets = 1;
656 
657         vcpu_e500->h2g_tlb1_rmap = kzalloc(sizeof(unsigned int) *
658                                            host_tlb_params[1].entries,
659                                            GFP_KERNEL);
660         if (!vcpu_e500->h2g_tlb1_rmap)
661                 return -EINVAL;
662 
663         return 0;
664 }
665 
666 void e500_mmu_host_uninit(struct kvmppc_vcpu_e500 *vcpu_e500)
667 {
668         kfree(vcpu_e500->h2g_tlb1_rmap);
669 }
670 

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