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 2009 16 * 17 * Authors: Alexander Graf <agraf@suse.de> 18 */ 19 20 #include <linux/types.h> 21 #include <linux/string.h> 22 #include <linux/kvm.h> 23 #include <linux/kvm_host.h> 24 #include <linux/highmem.h> 25 26 #include <asm/tlbflush.h> 27 #include <asm/kvm_ppc.h> 28 #include <asm/kvm_book3s.h> 29 30 /* #define DEBUG_MMU */ 31 /* #define DEBUG_MMU_PTE */ 32 /* #define DEBUG_MMU_PTE_IP 0xfff14c40 */ 33 34 #ifdef DEBUG_MMU 35 #define dprintk(X...) printk(KERN_INFO X) 36 #else 37 #define dprintk(X...) do { } while(0) 38 #endif 39 40 #ifdef DEBUG_MMU_PTE 41 #define dprintk_pte(X...) printk(KERN_INFO X) 42 #else 43 #define dprintk_pte(X...) do { } while(0) 44 #endif 45 46 #define PTEG_FLAG_ACCESSED 0x00000100 47 #define PTEG_FLAG_DIRTY 0x00000080 48 #ifndef SID_SHIFT 49 #define SID_SHIFT 28 50 #endif 51 52 static inline bool check_debug_ip(struct kvm_vcpu *vcpu) 53 { 54 #ifdef DEBUG_MMU_PTE_IP 55 return vcpu->arch.pc == DEBUG_MMU_PTE_IP; 56 #else 57 return true; 58 #endif 59 } 60 61 static inline u32 sr_vsid(u32 sr_raw) 62 { 63 return sr_raw & 0x0fffffff; 64 } 65 66 static inline bool sr_valid(u32 sr_raw) 67 { 68 return (sr_raw & 0x80000000) ? false : true; 69 } 70 71 static inline bool sr_ks(u32 sr_raw) 72 { 73 return (sr_raw & 0x40000000) ? true: false; 74 } 75 76 static inline bool sr_kp(u32 sr_raw) 77 { 78 return (sr_raw & 0x20000000) ? true: false; 79 } 80 81 static inline bool sr_nx(u32 sr_raw) 82 { 83 return (sr_raw & 0x10000000) ? true: false; 84 } 85 86 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, 87 struct kvmppc_pte *pte, bool data, 88 bool iswrite); 89 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, 90 u64 *vsid); 91 92 static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr) 93 { 94 return vcpu->arch.shared->sr[(eaddr >> 28) & 0xf]; 95 } 96 97 static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr, 98 bool data) 99 { 100 u64 vsid; 101 struct kvmppc_pte pte; 102 103 if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data, false)) 104 return pte.vpage; 105 106 kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid); 107 return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16); 108 } 109 110 static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu) 111 { 112 kvmppc_set_msr(vcpu, 0); 113 } 114 115 static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu, 116 u32 sre, gva_t eaddr, 117 bool primary) 118 { 119 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 120 u32 page, hash, pteg, htabmask; 121 hva_t r; 122 123 page = (eaddr & 0x0FFFFFFF) >> 12; 124 htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0; 125 126 hash = ((sr_vsid(sre) ^ page) << 6); 127 if (!primary) 128 hash = ~hash; 129 hash &= htabmask; 130 131 pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash; 132 133 dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n", 134 kvmppc_get_pc(&vcpu_book3s->vcpu), eaddr, vcpu_book3s->sdr1, pteg, 135 sr_vsid(sre)); 136 137 r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT); 138 if (kvm_is_error_hva(r)) 139 return r; 140 return r | (pteg & ~PAGE_MASK); 141 } 142 143 static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary) 144 { 145 return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 7) | 146 (primary ? 0 : 0x40) | 0x80000000; 147 } 148 149 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, 150 struct kvmppc_pte *pte, bool data, 151 bool iswrite) 152 { 153 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 154 struct kvmppc_bat *bat; 155 int i; 156 157 for (i = 0; i < 8; i++) { 158 if (data) 159 bat = &vcpu_book3s->dbat[i]; 160 else 161 bat = &vcpu_book3s->ibat[i]; 162 163 if (vcpu->arch.shared->msr & MSR_PR) { 164 if (!bat->vp) 165 continue; 166 } else { 167 if (!bat->vs) 168 continue; 169 } 170 171 if (check_debug_ip(vcpu)) 172 { 173 dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n", 174 data ? 'd' : 'i', i, eaddr, bat->bepi, 175 bat->bepi_mask); 176 } 177 if ((eaddr & bat->bepi_mask) == bat->bepi) { 178 u64 vsid; 179 kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, 180 eaddr >> SID_SHIFT, &vsid); 181 vsid <<= 16; 182 pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid; 183 184 pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask); 185 pte->may_read = bat->pp; 186 pte->may_write = bat->pp > 1; 187 pte->may_execute = true; 188 if (!pte->may_read) { 189 printk(KERN_INFO "BAT is not readable!\n"); 190 continue; 191 } 192 if (iswrite && !pte->may_write) { 193 dprintk_pte("BAT is read-only!\n"); 194 continue; 195 } 196 197 return 0; 198 } 199 } 200 201 return -ENOENT; 202 } 203 204 static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr, 205 struct kvmppc_pte *pte, bool data, 206 bool iswrite, bool primary) 207 { 208 u32 sre; 209 hva_t ptegp; 210 u32 pteg[16]; 211 u32 ptem = 0; 212 int i; 213 int found = 0; 214 215 sre = find_sr(vcpu, eaddr); 216 217 dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28, 218 sr_vsid(sre), sre); 219 220 pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); 221 222 ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, sre, eaddr, primary); 223 if (kvm_is_error_hva(ptegp)) { 224 printk(KERN_INFO "KVM: Invalid PTEG!\n"); 225 goto no_page_found; 226 } 227 228 ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary); 229 230 if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) { 231 printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp); 232 goto no_page_found; 233 } 234 235 for (i=0; i<16; i+=2) { 236 if (ptem == pteg[i]) { 237 u8 pp; 238 239 pte->raddr = (pteg[i+1] & ~(0xFFFULL)) | (eaddr & 0xFFF); 240 pp = pteg[i+1] & 3; 241 242 if ((sr_kp(sre) && (vcpu->arch.shared->msr & MSR_PR)) || 243 (sr_ks(sre) && !(vcpu->arch.shared->msr & MSR_PR))) 244 pp |= 4; 245 246 pte->may_write = false; 247 pte->may_read = false; 248 pte->may_execute = true; 249 switch (pp) { 250 case 0: 251 case 1: 252 case 2: 253 case 6: 254 pte->may_write = true; 255 case 3: 256 case 5: 257 case 7: 258 pte->may_read = true; 259 break; 260 } 261 262 dprintk_pte("MMU: Found PTE -> %x %x - %x\n", 263 pteg[i], pteg[i+1], pp); 264 found = 1; 265 break; 266 } 267 } 268 269 /* Update PTE C and A bits, so the guest's swapper knows we used the 270 page */ 271 if (found) { 272 u32 pte_r = pteg[i+1]; 273 char __user *addr = (char __user *) &pteg[i+1]; 274 275 /* 276 * Use single-byte writes to update the HPTE, to 277 * conform to what real hardware does. 278 */ 279 if (pte->may_read && !(pte_r & PTEG_FLAG_ACCESSED)) { 280 pte_r |= PTEG_FLAG_ACCESSED; 281 put_user(pte_r >> 8, addr + 2); 282 } 283 if (iswrite && pte->may_write && !(pte_r & PTEG_FLAG_DIRTY)) { 284 pte_r |= PTEG_FLAG_DIRTY; 285 put_user(pte_r, addr + 3); 286 } 287 if (!pte->may_read || (iswrite && !pte->may_write)) 288 return -EPERM; 289 return 0; 290 } 291 292 no_page_found: 293 294 if (check_debug_ip(vcpu)) { 295 dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n", 296 to_book3s(vcpu)->sdr1, ptegp); 297 for (i=0; i<16; i+=2) { 298 dprintk_pte(" %02d: 0x%x - 0x%x (0x%x)\n", 299 i, pteg[i], pteg[i+1], ptem); 300 } 301 } 302 303 return -ENOENT; 304 } 305 306 static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, 307 struct kvmppc_pte *pte, bool data, 308 bool iswrite) 309 { 310 int r; 311 ulong mp_ea = vcpu->arch.magic_page_ea; 312 313 pte->eaddr = eaddr; 314 pte->page_size = MMU_PAGE_4K; 315 316 /* Magic page override */ 317 if (unlikely(mp_ea) && 318 unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) && 319 !(vcpu->arch.shared->msr & MSR_PR)) { 320 pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); 321 pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff); 322 pte->raddr &= KVM_PAM; 323 pte->may_execute = true; 324 pte->may_read = true; 325 pte->may_write = true; 326 327 return 0; 328 } 329 330 r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data, iswrite); 331 if (r < 0) 332 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, 333 data, iswrite, true); 334 if (r < 0) 335 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, 336 data, iswrite, false); 337 338 return r; 339 } 340 341 342 static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum) 343 { 344 return vcpu->arch.shared->sr[srnum]; 345 } 346 347 static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, 348 ulong value) 349 { 350 vcpu->arch.shared->sr[srnum] = value; 351 kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT); 352 } 353 354 static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large) 355 { 356 int i; 357 struct kvm_vcpu *v; 358 359 /* flush this VA on all cpus */ 360 kvm_for_each_vcpu(i, v, vcpu->kvm) 361 kvmppc_mmu_pte_flush(v, ea, 0x0FFFF000); 362 } 363 364 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, 365 u64 *vsid) 366 { 367 ulong ea = esid << SID_SHIFT; 368 u32 sr; 369 u64 gvsid = esid; 370 371 if (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) { 372 sr = find_sr(vcpu, ea); 373 if (sr_valid(sr)) 374 gvsid = sr_vsid(sr); 375 } 376 377 /* In case we only have one of MSR_IR or MSR_DR set, let's put 378 that in the real-mode context (and hope RM doesn't access 379 high memory) */ 380 switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) { 381 case 0: 382 *vsid = VSID_REAL | esid; 383 break; 384 case MSR_IR: 385 *vsid = VSID_REAL_IR | gvsid; 386 break; 387 case MSR_DR: 388 *vsid = VSID_REAL_DR | gvsid; 389 break; 390 case MSR_DR|MSR_IR: 391 if (sr_valid(sr)) 392 *vsid = sr_vsid(sr); 393 else 394 *vsid = VSID_BAT | gvsid; 395 break; 396 default: 397 BUG(); 398 } 399 400 if (vcpu->arch.shared->msr & MSR_PR) 401 *vsid |= VSID_PR; 402 403 return 0; 404 } 405 406 static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu) 407 { 408 return true; 409 } 410 411 412 void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu) 413 { 414 struct kvmppc_mmu *mmu = &vcpu->arch.mmu; 415 416 mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin; 417 mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin; 418 mmu->xlate = kvmppc_mmu_book3s_32_xlate; 419 mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr; 420 mmu->tlbie = kvmppc_mmu_book3s_32_tlbie; 421 mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid; 422 mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp; 423 mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32; 424 425 mmu->slbmte = NULL; 426 mmu->slbmfee = NULL; 427 mmu->slbmfev = NULL; 428 mmu->slbie = NULL; 429 mmu->slbia = NULL; 430 } 431