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Linux/arch/powerpc/kvm/book3s_mmu_hpte.c

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  1 /*
  2  * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
  3  *
  4  * Authors:
  5  *     Alexander Graf <agraf@suse.de>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License, version 2, as
  9  * published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 19  */
 20 
 21 #include <linux/kvm_host.h>
 22 #include <linux/hash.h>
 23 #include <linux/slab.h>
 24 
 25 #include <asm/kvm_ppc.h>
 26 #include <asm/kvm_book3s.h>
 27 #include <asm/machdep.h>
 28 #include <asm/mmu_context.h>
 29 #include <asm/hw_irq.h>
 30 
 31 #include "trace_pr.h"
 32 
 33 #define PTE_SIZE        12
 34 
 35 static struct kmem_cache *hpte_cache;
 36 
 37 static inline u64 kvmppc_mmu_hash_pte(u64 eaddr)
 38 {
 39         return hash_64(eaddr >> PTE_SIZE, HPTEG_HASH_BITS_PTE);
 40 }
 41 
 42 static inline u64 kvmppc_mmu_hash_pte_long(u64 eaddr)
 43 {
 44         return hash_64((eaddr & 0x0ffff000) >> PTE_SIZE,
 45                        HPTEG_HASH_BITS_PTE_LONG);
 46 }
 47 
 48 static inline u64 kvmppc_mmu_hash_vpte(u64 vpage)
 49 {
 50         return hash_64(vpage & 0xfffffffffULL, HPTEG_HASH_BITS_VPTE);
 51 }
 52 
 53 static inline u64 kvmppc_mmu_hash_vpte_long(u64 vpage)
 54 {
 55         return hash_64((vpage & 0xffffff000ULL) >> 12,
 56                        HPTEG_HASH_BITS_VPTE_LONG);
 57 }
 58 
 59 #ifdef CONFIG_PPC_BOOK3S_64
 60 static inline u64 kvmppc_mmu_hash_vpte_64k(u64 vpage)
 61 {
 62         return hash_64((vpage & 0xffffffff0ULL) >> 4,
 63                        HPTEG_HASH_BITS_VPTE_64K);
 64 }
 65 #endif
 66 
 67 void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
 68 {
 69         u64 index;
 70         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 71 
 72         trace_kvm_book3s_mmu_map(pte);
 73 
 74         spin_lock(&vcpu3s->mmu_lock);
 75 
 76         /* Add to ePTE list */
 77         index = kvmppc_mmu_hash_pte(pte->pte.eaddr);
 78         hlist_add_head_rcu(&pte->list_pte, &vcpu3s->hpte_hash_pte[index]);
 79 
 80         /* Add to ePTE_long list */
 81         index = kvmppc_mmu_hash_pte_long(pte->pte.eaddr);
 82         hlist_add_head_rcu(&pte->list_pte_long,
 83                            &vcpu3s->hpte_hash_pte_long[index]);
 84 
 85         /* Add to vPTE list */
 86         index = kvmppc_mmu_hash_vpte(pte->pte.vpage);
 87         hlist_add_head_rcu(&pte->list_vpte, &vcpu3s->hpte_hash_vpte[index]);
 88 
 89         /* Add to vPTE_long list */
 90         index = kvmppc_mmu_hash_vpte_long(pte->pte.vpage);
 91         hlist_add_head_rcu(&pte->list_vpte_long,
 92                            &vcpu3s->hpte_hash_vpte_long[index]);
 93 
 94 #ifdef CONFIG_PPC_BOOK3S_64
 95         /* Add to vPTE_64k list */
 96         index = kvmppc_mmu_hash_vpte_64k(pte->pte.vpage);
 97         hlist_add_head_rcu(&pte->list_vpte_64k,
 98                            &vcpu3s->hpte_hash_vpte_64k[index]);
 99 #endif
100 
101         vcpu3s->hpte_cache_count++;
102 
103         spin_unlock(&vcpu3s->mmu_lock);
104 }
105 
106 static void free_pte_rcu(struct rcu_head *head)
107 {
108         struct hpte_cache *pte = container_of(head, struct hpte_cache, rcu_head);
109         kmem_cache_free(hpte_cache, pte);
110 }
111 
112 static void invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
113 {
114         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
115 
116         trace_kvm_book3s_mmu_invalidate(pte);
117 
118         /* Different for 32 and 64 bit */
119         kvmppc_mmu_invalidate_pte(vcpu, pte);
120 
121         spin_lock(&vcpu3s->mmu_lock);
122 
123         /* pte already invalidated in between? */
124         if (hlist_unhashed(&pte->list_pte)) {
125                 spin_unlock(&vcpu3s->mmu_lock);
126                 return;
127         }
128 
129         hlist_del_init_rcu(&pte->list_pte);
130         hlist_del_init_rcu(&pte->list_pte_long);
131         hlist_del_init_rcu(&pte->list_vpte);
132         hlist_del_init_rcu(&pte->list_vpte_long);
133 #ifdef CONFIG_PPC_BOOK3S_64
134         hlist_del_init_rcu(&pte->list_vpte_64k);
135 #endif
136         vcpu3s->hpte_cache_count--;
137 
138         spin_unlock(&vcpu3s->mmu_lock);
139 
140         call_rcu(&pte->rcu_head, free_pte_rcu);
141 }
142 
143 static void kvmppc_mmu_pte_flush_all(struct kvm_vcpu *vcpu)
144 {
145         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
146         struct hpte_cache *pte;
147         int i;
148 
149         rcu_read_lock();
150 
151         for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
152                 struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];
153 
154                 hlist_for_each_entry_rcu(pte, list, list_vpte_long)
155                         invalidate_pte(vcpu, pte);
156         }
157 
158         rcu_read_unlock();
159 }
160 
161 static void kvmppc_mmu_pte_flush_page(struct kvm_vcpu *vcpu, ulong guest_ea)
162 {
163         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
164         struct hlist_head *list;
165         struct hpte_cache *pte;
166 
167         /* Find the list of entries in the map */
168         list = &vcpu3s->hpte_hash_pte[kvmppc_mmu_hash_pte(guest_ea)];
169 
170         rcu_read_lock();
171 
172         /* Check the list for matching entries and invalidate */
173         hlist_for_each_entry_rcu(pte, list, list_pte)
174                 if ((pte->pte.eaddr & ~0xfffUL) == guest_ea)
175                         invalidate_pte(vcpu, pte);
176 
177         rcu_read_unlock();
178 }
179 
180 static void kvmppc_mmu_pte_flush_long(struct kvm_vcpu *vcpu, ulong guest_ea)
181 {
182         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
183         struct hlist_head *list;
184         struct hpte_cache *pte;
185 
186         /* Find the list of entries in the map */
187         list = &vcpu3s->hpte_hash_pte_long[
188                         kvmppc_mmu_hash_pte_long(guest_ea)];
189 
190         rcu_read_lock();
191 
192         /* Check the list for matching entries and invalidate */
193         hlist_for_each_entry_rcu(pte, list, list_pte_long)
194                 if ((pte->pte.eaddr & 0x0ffff000UL) == guest_ea)
195                         invalidate_pte(vcpu, pte);
196 
197         rcu_read_unlock();
198 }
199 
200 void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
201 {
202         trace_kvm_book3s_mmu_flush("", vcpu, guest_ea, ea_mask);
203         guest_ea &= ea_mask;
204 
205         switch (ea_mask) {
206         case ~0xfffUL:
207                 kvmppc_mmu_pte_flush_page(vcpu, guest_ea);
208                 break;
209         case 0x0ffff000:
210                 kvmppc_mmu_pte_flush_long(vcpu, guest_ea);
211                 break;
212         case 0:
213                 /* Doing a complete flush -> start from scratch */
214                 kvmppc_mmu_pte_flush_all(vcpu);
215                 break;
216         default:
217                 WARN_ON(1);
218                 break;
219         }
220 }
221 
222 /* Flush with mask 0xfffffffff */
223 static void kvmppc_mmu_pte_vflush_short(struct kvm_vcpu *vcpu, u64 guest_vp)
224 {
225         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
226         struct hlist_head *list;
227         struct hpte_cache *pte;
228         u64 vp_mask = 0xfffffffffULL;
229 
230         list = &vcpu3s->hpte_hash_vpte[kvmppc_mmu_hash_vpte(guest_vp)];
231 
232         rcu_read_lock();
233 
234         /* Check the list for matching entries and invalidate */
235         hlist_for_each_entry_rcu(pte, list, list_vpte)
236                 if ((pte->pte.vpage & vp_mask) == guest_vp)
237                         invalidate_pte(vcpu, pte);
238 
239         rcu_read_unlock();
240 }
241 
242 #ifdef CONFIG_PPC_BOOK3S_64
243 /* Flush with mask 0xffffffff0 */
244 static void kvmppc_mmu_pte_vflush_64k(struct kvm_vcpu *vcpu, u64 guest_vp)
245 {
246         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
247         struct hlist_head *list;
248         struct hpte_cache *pte;
249         u64 vp_mask = 0xffffffff0ULL;
250 
251         list = &vcpu3s->hpte_hash_vpte_64k[
252                 kvmppc_mmu_hash_vpte_64k(guest_vp)];
253 
254         rcu_read_lock();
255 
256         /* Check the list for matching entries and invalidate */
257         hlist_for_each_entry_rcu(pte, list, list_vpte_64k)
258                 if ((pte->pte.vpage & vp_mask) == guest_vp)
259                         invalidate_pte(vcpu, pte);
260 
261         rcu_read_unlock();
262 }
263 #endif
264 
265 /* Flush with mask 0xffffff000 */
266 static void kvmppc_mmu_pte_vflush_long(struct kvm_vcpu *vcpu, u64 guest_vp)
267 {
268         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
269         struct hlist_head *list;
270         struct hpte_cache *pte;
271         u64 vp_mask = 0xffffff000ULL;
272 
273         list = &vcpu3s->hpte_hash_vpte_long[
274                 kvmppc_mmu_hash_vpte_long(guest_vp)];
275 
276         rcu_read_lock();
277 
278         /* Check the list for matching entries and invalidate */
279         hlist_for_each_entry_rcu(pte, list, list_vpte_long)
280                 if ((pte->pte.vpage & vp_mask) == guest_vp)
281                         invalidate_pte(vcpu, pte);
282 
283         rcu_read_unlock();
284 }
285 
286 void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
287 {
288         trace_kvm_book3s_mmu_flush("v", vcpu, guest_vp, vp_mask);
289         guest_vp &= vp_mask;
290 
291         switch(vp_mask) {
292         case 0xfffffffffULL:
293                 kvmppc_mmu_pte_vflush_short(vcpu, guest_vp);
294                 break;
295 #ifdef CONFIG_PPC_BOOK3S_64
296         case 0xffffffff0ULL:
297                 kvmppc_mmu_pte_vflush_64k(vcpu, guest_vp);
298                 break;
299 #endif
300         case 0xffffff000ULL:
301                 kvmppc_mmu_pte_vflush_long(vcpu, guest_vp);
302                 break;
303         default:
304                 WARN_ON(1);
305                 return;
306         }
307 }
308 
309 void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
310 {
311         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
312         struct hpte_cache *pte;
313         int i;
314 
315         trace_kvm_book3s_mmu_flush("p", vcpu, pa_start, pa_end);
316 
317         rcu_read_lock();
318 
319         for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
320                 struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];
321 
322                 hlist_for_each_entry_rcu(pte, list, list_vpte_long)
323                         if ((pte->pte.raddr >= pa_start) &&
324                             (pte->pte.raddr < pa_end))
325                                 invalidate_pte(vcpu, pte);
326         }
327 
328         rcu_read_unlock();
329 }
330 
331 struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
332 {
333         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
334         struct hpte_cache *pte;
335 
336         if (vcpu3s->hpte_cache_count == HPTEG_CACHE_NUM)
337                 kvmppc_mmu_pte_flush_all(vcpu);
338 
339         pte = kmem_cache_zalloc(hpte_cache, GFP_KERNEL);
340 
341         return pte;
342 }
343 
344 void kvmppc_mmu_hpte_cache_free(struct hpte_cache *pte)
345 {
346         kmem_cache_free(hpte_cache, pte);
347 }
348 
349 void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu)
350 {
351         kvmppc_mmu_pte_flush(vcpu, 0, 0);
352 }
353 
354 static void kvmppc_mmu_hpte_init_hash(struct hlist_head *hash_list, int len)
355 {
356         int i;
357 
358         for (i = 0; i < len; i++)
359                 INIT_HLIST_HEAD(&hash_list[i]);
360 }
361 
362 int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu)
363 {
364         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
365 
366         /* init hpte lookup hashes */
367         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte,
368                                   ARRAY_SIZE(vcpu3s->hpte_hash_pte));
369         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte_long,
370                                   ARRAY_SIZE(vcpu3s->hpte_hash_pte_long));
371         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte,
372                                   ARRAY_SIZE(vcpu3s->hpte_hash_vpte));
373         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_long,
374                                   ARRAY_SIZE(vcpu3s->hpte_hash_vpte_long));
375 #ifdef CONFIG_PPC_BOOK3S_64
376         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_64k,
377                                   ARRAY_SIZE(vcpu3s->hpte_hash_vpte_64k));
378 #endif
379 
380         spin_lock_init(&vcpu3s->mmu_lock);
381 
382         return 0;
383 }
384 
385 int kvmppc_mmu_hpte_sysinit(void)
386 {
387         /* init hpte slab cache */
388         hpte_cache = kmem_cache_create("kvm-spt", sizeof(struct hpte_cache),
389                                        sizeof(struct hpte_cache), 0, NULL);
390 
391         return 0;
392 }
393 
394 void kvmppc_mmu_hpte_sysexit(void)
395 {
396         kmem_cache_destroy(hpte_cache);
397 }
398 

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