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