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         spin_unlock(&vcpu3s->mmu_lock);
 118
 119         vcpu3s->hpte_cache_count--;
 120         call_rcu(&pte->rcu_head, free_pte_rcu);
 121 }
 122
 123 static void kvmppc_mmu_pte_flush_all(struct kvm_vcpu *vcpu)
 124 {
 125         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 126         struct hpte_cache *pte;
 127         int i;
 128
 129         rcu_read_lock();
 130
 131         for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
 132                 struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];
 133
 134                 hlist_for_each_entry_rcu(pte, list, list_vpte_long)
 135                         invalidate_pte(vcpu, pte);
 136         }
 137
 138         rcu_read_unlock();
 139 }
 140
 141 static void kvmppc_mmu_pte_flush_page(struct kvm_vcpu *vcpu, ulong guest_ea)
 142 {
 143         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 144         struct hlist_head *list;
 145         struct hpte_cache *pte;
 146
 147         /* Find the list of entries in the map */
 148         list = &vcpu3s->hpte_hash_pte[kvmppc_mmu_hash_pte(guest_ea)];
 149
 150         rcu_read_lock();
 151
 152         /* Check the list for matching entries and invalidate */
 153         hlist_for_each_entry_rcu(pte, list, list_pte)
 154                 if ((pte->pte.eaddr & ~0xfffUL) == guest_ea)
 155                         invalidate_pte(vcpu, pte);
 156
 157         rcu_read_unlock();
 158 }
 159
 160 static void kvmppc_mmu_pte_flush_long(struct kvm_vcpu *vcpu, ulong guest_ea)
 161 {
 162         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 163         struct hlist_head *list;
 164         struct hpte_cache *pte;
 165
 166         /* Find the list of entries in the map */
 167         list = &vcpu3s->hpte_hash_pte_long[
 168                         kvmppc_mmu_hash_pte_long(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_long)
 174                 if ((pte->pte.eaddr & 0x0ffff000UL) == guest_ea)
 175                         invalidate_pte(vcpu, pte);
 176
 177         rcu_read_unlock();
 178 }
 179
 180 void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
 181 {
 182         trace_kvm_book3s_mmu_flush("", vcpu, guest_ea, ea_mask);
 183         guest_ea &= ea_mask;
 184
 185         switch (ea_mask) {
 186         case ~0xfffUL:
 187                 kvmppc_mmu_pte_flush_page(vcpu, guest_ea);
 188                 break;
 189         case 0x0ffff000:
 190                 kvmppc_mmu_pte_flush_long(vcpu, guest_ea);
 191                 break;
 192         case 0:
 193                 /* Doing a complete flush -> start from scratch */
 194                 kvmppc_mmu_pte_flush_all(vcpu);
 195                 break;
 196         default:
 197                 WARN_ON(1);
 198                 break;
 199         }
 200 }
 201
 202 /* Flush with mask 0xfffffffff */
 203 static void kvmppc_mmu_pte_vflush_short(struct kvm_vcpu *vcpu, u64 guest_vp)
 204 {
 205         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 206         struct hlist_head *list;
 207         struct hpte_cache *pte;
 208         u64 vp_mask = 0xfffffffffULL;
 209
 210         list = &vcpu3s->hpte_hash_vpte[kvmppc_mmu_hash_vpte(guest_vp)];
 211
 212         rcu_read_lock();
 213
 214         /* Check the list for matching entries and invalidate */
 215         hlist_for_each_entry_rcu(pte, list, list_vpte)
 216                 if ((pte->pte.vpage & vp_mask) == guest_vp)
 217                         invalidate_pte(vcpu, pte);
 218
 219         rcu_read_unlock();
 220 }
 221
 222 /* Flush with mask 0xffffff000 */
 223 static void kvmppc_mmu_pte_vflush_long(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 = 0xffffff000ULL;
 229
 230         list = &vcpu3s->hpte_hash_vpte_long[
 231                 kvmppc_mmu_hash_vpte_long(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_long)
 237                 if ((pte->pte.vpage & vp_mask) == guest_vp)
 238                         invalidate_pte(vcpu, pte);
 239
 240         rcu_read_unlock();
 241 }
 242
 243 void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
 244 {
 245         trace_kvm_book3s_mmu_flush("v", vcpu, guest_vp, vp_mask);
 246         guest_vp &= vp_mask;
 247
 248         switch(vp_mask) {
 249         case 0xfffffffffULL:
 250                 kvmppc_mmu_pte_vflush_short(vcpu, guest_vp);
 251                 break;
 252         case 0xffffff000ULL:
 253                 kvmppc_mmu_pte_vflush_long(vcpu, guest_vp);
 254                 break;
 255         default:
 256                 WARN_ON(1);
 257                 return;
 258         }
 259 }
 260
 261 void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
 262 {
 263         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 264         struct hpte_cache *pte;
 265         int i;
 266
 267         trace_kvm_book3s_mmu_flush("p", vcpu, pa_start, pa_end);
 268
 269         rcu_read_lock();
 270
 271         for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
 272                 struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];
 273
 274                 hlist_for_each_entry_rcu(pte, list, list_vpte_long)
 275                         if ((pte->pte.raddr >= pa_start) &&
 276                             (pte->pte.raddr < pa_end))
 277                                 invalidate_pte(vcpu, pte);
 278         }
 279
 280         rcu_read_unlock();
 281 }
 282
 283 struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
 284 {
 285         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 286         struct hpte_cache *pte;
 287
 288         pte = kmem_cache_zalloc(hpte_cache, GFP_KERNEL);
 289         vcpu3s->hpte_cache_count++;
 290
 291         if (vcpu3s->hpte_cache_count == HPTEG_CACHE_NUM)
 292                 kvmppc_mmu_pte_flush_all(vcpu);
 293
 294         return pte;
 295 }
 296
 297 void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu)
 298 {
 299         kvmppc_mmu_pte_flush(vcpu, 0, 0);
 300 }
 301
 302 static void kvmppc_mmu_hpte_init_hash(struct hlist_head *hash_list, int len)
 303 {
 304         int i;
 305
 306         for (i = 0; i < len; i++)
 307                 INIT_HLIST_HEAD(&hash_list[i]);
 308 }
 309
 310 int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu)
 311 {
 312         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 313
 314         /* init hpte lookup hashes */
 315         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte,
 316                                   ARRAY_SIZE(vcpu3s->hpte_hash_pte));
 317         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte_long,
 318                                   ARRAY_SIZE(vcpu3s->hpte_hash_pte_long));
 319         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte,
 320                                   ARRAY_SIZE(vcpu3s->hpte_hash_vpte));
 321         kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_long,
 322                                   ARRAY_SIZE(vcpu3s->hpte_hash_vpte_long));
 323
 324         spin_lock_init(&vcpu3s->mmu_lock);
 325
 326         return 0;
 327 }
 328
 329 int kvmppc_mmu_hpte_sysinit(void)
 330 {
 331         /* init hpte slab cache */
 332         hpte_cache = kmem_cache_create("kvm-spt", sizeof(struct hpte_cache),
 333                                        sizeof(struct hpte_cache), 0, NULL);
 334
 335         return 0;
 336 }
 337
 338 void kvmppc_mmu_hpte_sysexit(void)
 339 {
 340         kmem_cache_destroy(hpte_cache);
 341 }