LXR linux/arch/powerpc/kvm/book3s_mmu

   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
  35static struct kmem_cache *hpte_cache;
  36
  37static inline u64 kvmppc_mmu_hash_pte(u64 eaddr)
  38{
  39        return hash_64(eaddr >> PTE_SIZE, HPTEG_HASH_BITS_PTE);
  40}
  41
  42static 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
  48static inline u64 kvmppc_mmu_hash_vpte(u64 vpage)
  49{
  50        return hash_64(vpage & 0xfffffffffULL, HPTEG_HASH_BITS_VPTE);
  51}
  52
  53static 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
  59void 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
  89static 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
  95static 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
 123static 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
 141static 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
 160static 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
 180void 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 */
 203static 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 */
 223static 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
 243void 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
 261void 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
 283struct 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
 297void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu)
 298{
 299        kvmppc_mmu_pte_flush(vcpu, 0, 0);
 300}
 301
 302static 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
 310int 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
 329int 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
 338void kvmppc_mmu_hpte_sysexit(void)
 339{
 340        kmem_cache_destroy(hpte_cache);
 341}
 342