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 } 342