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.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 void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
  60 {
  61         u64 index;
  62         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
  63
  64         trace_kvm_book3s_mmu_map(pte);
  65
  66         spin_lock(&vcpu3s->mmu_lock);
  67
  68         /* Add to ePTE list */
  69         index = kvmppc_mmu_hash_pte(pte->pte.eaddr);
  70         hlist_add_head_rcu(&pte->list_pte, &vcpu3s->hpte_hash_pte[index]);
  71
  72         /* Add to ePTE_long list */
  73         index = kvmppc_mmu_hash_pte_long(pte->pte.eaddr);
  74         hlist_add_head_rcu(&pte->list_pte_long,
  75                            &vcpu3s->hpte_hash_pte_long[index]);
  76
  77         /* Add to vPTE list */
  78         index = kvmppc_mmu_hash_vpte(pte->pte.vpage);
  79         hlist_add_head_rcu(&pte->list_vpte, &vcpu3s->hpte_hash_vpte[index]);
  80
  81         /* Add to vPTE_long list */
  82         index = kvmppc_mmu_hash_vpte_long(pte->pte.vpage);
  83         hlist_add_head_rcu(&pte->list_vpte_long,
  84                            &vcpu3s->hpte_hash_vpte_long[index]);
  85
  86         spin_unlock(&vcpu3s->mmu_lock);
  87 }
  88
  89 static void free_pte_rcu(struct rcu_head *head)
  90 {
  91         struct hpte_cache *pte = container_of(head, struct hpte_cache, rcu_head);
  92         kmem_cache_free(hpte_cache, pte);
  93 }
  94
  95 static void invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
  96 {
  97         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
  98
  99         trace_kvm_book3s_mmu_invalidate(pte);
 100
 101         /* Different for 32 and 64 bit */
 102         kvmppc_mmu_invalidate_pte(vcpu, pte);
 103
 104         spin_lock(&vcpu3s->mmu_lock);
 105
 106         /* pte already invalidated in between? */
 107         if (hlist_unhashed(&pte->list_pte)) {
 108                 spin_unlock(&vcpu3s->mmu_lock);
 109                 return;
 110         }
 111
 112         hlist_del_init_rcu(&pte->list_pte);
 113         hlist_del_init_rcu(&pte->list_pte_long);
 114         hlist_del_init_rcu(&pte->list_vpte);
 115         hlist_del_init_rcu(&pte->list_vpte_long);
 116
 117         if (pte->pte.may_write)
 118                 kvm_release_pfn_dirty(pte->pfn);
 119         else
 120                 kvm_release_pfn_clean(pte->pfn);
 121
 122         spin_unlock(&vcpu3s->mmu_lock);
 123
 124         vcpu3s->hpte_cache_count--;
 125         call_rcu(&pte->rcu_head, free_pte_rcu);
 126 }
 127
 128 static void kvmppc_mmu_pte_flush_all(struct kvm_vcpu *vcpu)
 129 {
 130         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 131         struct hpte_cache *pte;
 132         struct hlist_node *node;
 133         int i;
 134
 135         rcu_read_lock();
 136
 137         for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
 138                 struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];
 139
 140                 hlist_for_each_entry_rcu(pte, node, list, list_vpte_long)
 141                         invalidate_pte(vcpu, pte);
 142         }
 143
 144         rcu_read_unlock();
 145 }
 146
 147 static void kvmppc_mmu_pte_flush_page(struct kvm_vcpu *vcpu, ulong guest_ea)
 148 {
 149         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 150         struct hlist_head *list;
 151         struct hlist_node *node;
 152         struct hpte_cache *pte;
 153
 154         /* Find the list of entries in the map */
 155         list = &vcpu3s->hpte_hash_pte[kvmppc_mmu_hash_pte(guest_ea)];
 156
 157         rcu_read_lock();
 158
 159         /* Check the list for matching entries and invalidate */
 160         hlist_for_each_entry_rcu(pte, node, list, list_pte)
 161                 if ((pte->pte.eaddr & ~0xfffUL) == guest_ea)
 162                         invalidate_pte(vcpu, pte);
 163
 164         rcu_read_unlock();
 165 }
 166
 167 static void kvmppc_mmu_pte_flush_long(struct kvm_vcpu *vcpu, ulong guest_ea)
 168 {
 169         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 170         struct hlist_head *list;
 171         struct hlist_node *node;
 172         struct hpte_cache *pte;
 173
 174         /* Find the list of entries in the map */
 175         list = &vcpu3s->hpte_hash_pte_long[
 176                         kvmppc_mmu_hash_pte_long(guest_ea)];
 177
 178         rcu_read_lock();
 179
 180         /* Check the list for matching entries and invalidate */
 181         hlist_for_each_entry_rcu(pte, node, list, list_pte_long)
 182                 if ((pte->pte.eaddr & 0x0ffff000UL) == guest_ea)
 183                         invalidate_pte(vcpu, pte);
 184
 185         rcu_read_unlock();
 186 }
 187
 188 void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
 189 {
 190         trace_kvm_book3s_mmu_flush("", vcpu, guest_ea, ea_mask);
 191         guest_ea &= ea_mask;
 192
 193         switch (ea_mask) {
 194         case ~0xfffUL:
 195                 kvmppc_mmu_pte_flush_page(vcpu, guest_ea);
 196                 break;
 197         case 0x0ffff000:
 198                 kvmppc_mmu_pte_flush_long(vcpu, guest_ea);
 199                 break;
 200         case 0:
 201                 /* Doing a complete flush -> start from scratch */
 202                 kvmppc_mmu_pte_flush_all(vcpu);
 203                 break;
 204         default:
 205                 WARN_ON(1);
 206                 break;
 207         }
 208 }
 209
 210 /* Flush with mask 0xfffffffff */
 211 static void kvmppc_mmu_pte_vflush_short(struct kvm_vcpu *vcpu, u64 guest_vp)
 212 {
 213         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 214         struct hlist_head *list;
 215         struct hlist_node *node;
 216         struct hpte_cache *pte;
 217         u64 vp_mask = 0xfffffffffULL;
 218
 219         list = &vcpu3s->hpte_hash_vpte[kvmppc_mmu_hash_vpte(guest_vp)];
 220
 221         rcu_read_lock();
 222
 223         /* Check the list for matching entries and invalidate */
 224         hlist_for_each_entry_rcu(pte, node, list, list_vpte)
 225                 if ((pte->pte.vpage & vp_mask) == guest_vp)
 226                         invalidate_pte(vcpu, pte);
 227
 228         rcu_read_unlock();
 229 }
 230
 231 /* Flush with mask 0xffffff000 */
 232 static void kvmppc_mmu_pte_vflush_long(struct kvm_vcpu *vcpu, u64 guest_vp)
 233 {
 234         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 235         struct hlist_head *list;
 236         struct hlist_node *node;
 237         struct hpte_cache *pte;
 238         u64 vp_mask = 0xffffff000ULL;
 239
 240         list = &vcpu3s->hpte_hash_vpte_long[
 241                 kvmppc_mmu_hash_vpte_long(guest_vp)];
 242
 243         rcu_read_lock();
 244
 245         /* Check the list for matching entries and invalidate */
 246         hlist_for_each_entry_rcu(pte, node, list, list_vpte_long)
 247                 if ((pte->pte.vpage & vp_mask) == guest_vp)
 248                         invalidate_pte(vcpu, pte);
 249
 250         rcu_read_unlock();
 251 }
 252
 253 void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
 254 {
 255         trace_kvm_book3s_mmu_flush("v", vcpu, guest_vp, vp_mask);
 256         guest_vp &= vp_mask;
 257
 258         switch(vp_mask) {
 259         case 0xfffffffffULL:
 260                 kvmppc_mmu_pte_vflush_short(vcpu, guest_vp);
 261                 break;
 262         case 0xffffff000ULL:
 263                 kvmppc_mmu_pte_vflush_long(vcpu, guest_vp);
 264                 break;
 265         default:
 266                 WARN_ON(1);
 267                 return;
 268         }
 269 }
 270
 271 void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
 272 {
 273         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 274         struct hlist_node *node;
 275         struct hpte_cache *pte;
 276         int i;
 277
 278         trace_kvm_book3s_mmu_flush("p", vcpu, pa_start, pa_end);
 279
 280         rcu_read_lock();
 281
 282         for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
 283                 struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];
 284
 285                 hlist_for_each_entry_rcu(pte, node, list, list_vpte_long)
 286                         if ((pte->pte.raddr >= pa_start) &&
 287                             (pte->pte.raddr < pa_end))
 288                                 invalidate_pte(vcpu, pte);
 289         }
 290
 291         rcu_read_unlock();
 292 }
 293
 294 struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
 295 {
 296         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 297         struct hpte_cache *pte;
 298
 299         pte = kmem_cache_zalloc(hpte_cache, GFP_KERNEL);
 300         vcpu3s->hpte_cache_count++;
 301
 302         if (vcpu3s->hpte_cache_count == HPTEG_CACHE_NUM)
 303                 kvmppc_mmu_pte_flush_all(vcpu);
 304
 305         return pte;
 306 }
 307
 308 void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu)
 309 {
 310         kvmppc_mmu_pte_flush(vcpu, 0, 0);
 311 }
 312
 313 static void kvmppc_mmu_hpte_init_hash(struct hlist_head *hash_list, int len)
 314 {
 315         int i;
 316
 317         for (i = 0; i < len; i++)
 318                 INIT_HLIST_HEAD(&hash_list[i]);
 319 }
 320
 321 int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu)
 322 {
 323         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 324
 325         /* init hpte lookup hashes */
 326         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte,
 327                                   ARRAY_SIZE(vcpu3s->hpte_hash_pte));
 328         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte_long,
 329                                   ARRAY_SIZE(vcpu3s->hpte_hash_pte_long));
 330         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte,
 331                                   ARRAY_SIZE(vcpu3s->hpte_hash_vpte));
 332         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_long,
 333                                   ARRAY_SIZE(vcpu3s->hpte_hash_vpte_long));
 334
 335         spin_lock_init(&vcpu3s->mmu_lock);
 336
 337         return 0;
 338 }
 339
 340 int kvmppc_mmu_hpte_sysinit(void)
 341 {
 342         /* init hpte slab cache */
 343         hpte_cache = kmem_cache_create("kvm-spt", sizeof(struct hpte_cache),
 344                                        sizeof(struct hpte_cache), 0, NULL);
 345
 346         return 0;
 347 }
 348
 349 void kvmppc_mmu_hpte_sysexit(void)
 350 {
 351         kmem_cache_destroy(hpte_cache);
 352 }