arch/powerpc/kvm/book3s_mmu_hpte.c

   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 }