1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License, version 2, as 4 * published by the Free Software Foundation. 5 * 6 * This program is distributed in the hope that it will be useful, 7 * but WITHOUT ANY WARRANTY; without even the implied warranty of 8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9 * GNU General Public License for more details. 10 * 11 * You should have received a copy of the GNU General Public License 12 * along with this program; if not, write to the Free Software 13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 14 * 15 * Copyright SUSE Linux Products GmbH 2010 16 * 17 * Authors: Alexander Graf <agraf@suse.de> 18 */ 19 20 #ifndef __ASM_KVM_BOOK3S_64_H__ 21 #define __ASM_KVM_BOOK3S_64_H__ 22 23 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 24 static inline struct kvmppc_book3s_shadow_vcpu *svcpu_get(struct kvm_vcpu *vcpu) 25 { 26 preempt_disable(); 27 return &get_paca()->shadow_vcpu; 28 } 29 30 static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu) 31 { 32 preempt_enable(); 33 } 34 #endif 35 36 #define SPAPR_TCE_SHIFT 12 37 38 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 39 #define KVM_DEFAULT_HPT_ORDER 24 /* 16MB HPT by default */ 40 extern unsigned long kvm_rma_pages; 41 #endif 42 43 #define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */ 44 45 /* 46 * We use a lock bit in HPTE dword 0 to synchronize updates and 47 * accesses to each HPTE, and another bit to indicate non-present 48 * HPTEs. 49 */ 50 #define HPTE_V_HVLOCK 0x40UL 51 #define HPTE_V_ABSENT 0x20UL 52 53 /* 54 * We use this bit in the guest_rpte field of the revmap entry 55 * to indicate a modified HPTE. 56 */ 57 #define HPTE_GR_MODIFIED (1ul << 62) 58 59 /* These bits are reserved in the guest view of the HPTE */ 60 #define HPTE_GR_RESERVED HPTE_GR_MODIFIED 61 62 static inline long try_lock_hpte(unsigned long *hpte, unsigned long bits) 63 { 64 unsigned long tmp, old; 65 66 asm volatile(" ldarx %0,0,%2\n" 67 " and. %1,%0,%3\n" 68 " bne 2f\n" 69 " ori %0,%0,%4\n" 70 " stdcx. %0,0,%2\n" 71 " beq+ 2f\n" 72 " mr %1,%3\n" 73 "2: isync" 74 : "=&r" (tmp), "=&r" (old) 75 : "r" (hpte), "r" (bits), "i" (HPTE_V_HVLOCK) 76 : "cc", "memory"); 77 return old == 0; 78 } 79 80 static inline unsigned long compute_tlbie_rb(unsigned long v, unsigned long r, 81 unsigned long pte_index) 82 { 83 unsigned long rb, va_low; 84 85 rb = (v & ~0x7fUL) << 16; /* AVA field */ 86 va_low = pte_index >> 3; 87 if (v & HPTE_V_SECONDARY) 88 va_low = ~va_low; 89 /* xor vsid from AVA */ 90 if (!(v & HPTE_V_1TB_SEG)) 91 va_low ^= v >> 12; 92 else 93 va_low ^= v >> 24; 94 va_low &= 0x7ff; 95 if (v & HPTE_V_LARGE) { 96 rb |= 1; /* L field */ 97 if (cpu_has_feature(CPU_FTR_ARCH_206) && 98 (r & 0xff000)) { 99 /* non-16MB large page, must be 64k */ 100 /* (masks depend on page size) */ 101 rb |= 0x1000; /* page encoding in LP field */ 102 rb |= (va_low & 0x7f) << 16; /* 7b of VA in AVA/LP field */ 103 rb |= ((va_low << 4) & 0xf0); /* AVAL field (P7 doesn't seem to care) */ 104 } 105 } else { 106 /* 4kB page */ 107 rb |= (va_low & 0x7ff) << 12; /* remaining 11b of VA */ 108 } 109 rb |= (v >> 54) & 0x300; /* B field */ 110 return rb; 111 } 112 113 static inline unsigned long hpte_page_size(unsigned long h, unsigned long l) 114 { 115 /* only handle 4k, 64k and 16M pages for now */ 116 if (!(h & HPTE_V_LARGE)) 117 return 1ul << 12; /* 4k page */ 118 if ((l & 0xf000) == 0x1000 && cpu_has_feature(CPU_FTR_ARCH_206)) 119 return 1ul << 16; /* 64k page */ 120 if ((l & 0xff000) == 0) 121 return 1ul << 24; /* 16M page */ 122 return 0; /* error */ 123 } 124 125 static inline unsigned long hpte_rpn(unsigned long ptel, unsigned long psize) 126 { 127 return ((ptel & HPTE_R_RPN) & ~(psize - 1)) >> PAGE_SHIFT; 128 } 129 130 static inline int hpte_is_writable(unsigned long ptel) 131 { 132 unsigned long pp = ptel & (HPTE_R_PP0 | HPTE_R_PP); 133 134 return pp != PP_RXRX && pp != PP_RXXX; 135 } 136 137 static inline unsigned long hpte_make_readonly(unsigned long ptel) 138 { 139 if ((ptel & HPTE_R_PP0) || (ptel & HPTE_R_PP) == PP_RWXX) 140 ptel = (ptel & ~HPTE_R_PP) | PP_RXXX; 141 else 142 ptel |= PP_RXRX; 143 return ptel; 144 } 145 146 static inline int hpte_cache_flags_ok(unsigned long ptel, unsigned long io_type) 147 { 148 unsigned int wimg = ptel & HPTE_R_WIMG; 149 150 /* Handle SAO */ 151 if (wimg == (HPTE_R_W | HPTE_R_I | HPTE_R_M) && 152 cpu_has_feature(CPU_FTR_ARCH_206)) 153 wimg = HPTE_R_M; 154 155 if (!io_type) 156 return wimg == HPTE_R_M; 157 158 return (wimg & (HPTE_R_W | HPTE_R_I)) == io_type; 159 } 160 161 /* 162 * If it's present and writable, atomically set dirty and referenced bits and 163 * return the PTE, otherwise return 0. If we find a transparent hugepage 164 * and if it is marked splitting we return 0; 165 */ 166 static inline pte_t kvmppc_read_update_linux_pte(pte_t *ptep, int writing, 167 unsigned int hugepage) 168 { 169 pte_t old_pte, new_pte = __pte(0); 170 171 while (1) { 172 old_pte = pte_val(*ptep); 173 /* 174 * wait until _PAGE_BUSY is clear then set it atomically 175 */ 176 if (unlikely(old_pte & _PAGE_BUSY)) { 177 cpu_relax(); 178 continue; 179 } 180 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 181 /* If hugepage and is trans splitting return None */ 182 if (unlikely(hugepage && 183 pmd_trans_splitting(pte_pmd(old_pte)))) 184 return __pte(0); 185 #endif 186 /* If pte is not present return None */ 187 if (unlikely(!(old_pte & _PAGE_PRESENT))) 188 return __pte(0); 189 190 new_pte = pte_mkyoung(old_pte); 191 if (writing && pte_write(old_pte)) 192 new_pte = pte_mkdirty(new_pte); 193 194 if (old_pte == __cmpxchg_u64((unsigned long *)ptep, old_pte, 195 new_pte)) 196 break; 197 } 198 return new_pte; 199 } 200 201 202 /* Return HPTE cache control bits corresponding to Linux pte bits */ 203 static inline unsigned long hpte_cache_bits(unsigned long pte_val) 204 { 205 #if _PAGE_NO_CACHE == HPTE_R_I && _PAGE_WRITETHRU == HPTE_R_W 206 return pte_val & (HPTE_R_W | HPTE_R_I); 207 #else 208 return ((pte_val & _PAGE_NO_CACHE) ? HPTE_R_I : 0) + 209 ((pte_val & _PAGE_WRITETHRU) ? HPTE_R_W : 0); 210 #endif 211 } 212 213 static inline bool hpte_read_permission(unsigned long pp, unsigned long key) 214 { 215 if (key) 216 return PP_RWRX <= pp && pp <= PP_RXRX; 217 return 1; 218 } 219 220 static inline bool hpte_write_permission(unsigned long pp, unsigned long key) 221 { 222 if (key) 223 return pp == PP_RWRW; 224 return pp <= PP_RWRW; 225 } 226 227 static inline int hpte_get_skey_perm(unsigned long hpte_r, unsigned long amr) 228 { 229 unsigned long skey; 230 231 skey = ((hpte_r & HPTE_R_KEY_HI) >> 57) | 232 ((hpte_r & HPTE_R_KEY_LO) >> 9); 233 return (amr >> (62 - 2 * skey)) & 3; 234 } 235 236 static inline void lock_rmap(unsigned long *rmap) 237 { 238 do { 239 while (test_bit(KVMPPC_RMAP_LOCK_BIT, rmap)) 240 cpu_relax(); 241 } while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmap)); 242 } 243 244 static inline void unlock_rmap(unsigned long *rmap) 245 { 246 __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmap); 247 } 248 249 static inline bool slot_is_aligned(struct kvm_memory_slot *memslot, 250 unsigned long pagesize) 251 { 252 unsigned long mask = (pagesize >> PAGE_SHIFT) - 1; 253 254 if (pagesize <= PAGE_SIZE) 255 return 1; 256 return !(memslot->base_gfn & mask) && !(memslot->npages & mask); 257 } 258 259 /* 260 * This works for 4k, 64k and 16M pages on POWER7, 261 * and 4k and 16M pages on PPC970. 262 */ 263 static inline unsigned long slb_pgsize_encoding(unsigned long psize) 264 { 265 unsigned long senc = 0; 266 267 if (psize > 0x1000) { 268 senc = SLB_VSID_L; 269 if (psize == 0x10000) 270 senc |= SLB_VSID_LP_01; 271 } 272 return senc; 273 } 274 275 static inline int is_vrma_hpte(unsigned long hpte_v) 276 { 277 return (hpte_v & ~0xffffffUL) == 278 (HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16))); 279 } 280 281 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 282 /* 283 * Note modification of an HPTE; set the HPTE modified bit 284 * if anyone is interested. 285 */ 286 static inline void note_hpte_modification(struct kvm *kvm, 287 struct revmap_entry *rev) 288 { 289 if (atomic_read(&kvm->arch.hpte_mod_interest)) 290 rev->guest_rpte |= HPTE_GR_MODIFIED; 291 } 292 293 /* 294 * Like kvm_memslots(), but for use in real mode when we can't do 295 * any RCU stuff (since the secondary threads are offline from the 296 * kernel's point of view), and we can't print anything. 297 * Thus we use rcu_dereference_raw() rather than rcu_dereference_check(). 298 */ 299 static inline struct kvm_memslots *kvm_memslots_raw(struct kvm *kvm) 300 { 301 return rcu_dereference_raw_notrace(kvm->memslots); 302 } 303 304 #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */ 305 306 #endif /* __ASM_KVM_BOOK3S_64_H__ */ 307