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 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, 89 u64 *vsid); 90 91 static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr) 92 { 93 return vcpu->arch.shared->sr[(eaddr >> 28) & 0xf]; 94 } 95 96 static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr, 97 bool data) 98 { 99 u64 vsid; 100 struct kvmppc_pte pte; 101 102 if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data)) 103 return pte.vpage; 104 105 kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid); 106 return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16); 107 } 108 109 static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu) 110 { 111 kvmppc_set_msr(vcpu, 0); 112 } 113 114 static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvmppc_vcpu_book3s *vcpu_book3s, 115 u32 sre, gva_t eaddr, 116 bool primary) 117 { 118 u32 page, hash, pteg, htabmask; 119 hva_t r; 120 121 page = (eaddr & 0x0FFFFFFF) >> 12; 122 htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0; 123 124 hash = ((sr_vsid(sre) ^ page) << 6); 125 if (!primary) 126 hash = ~hash; 127 hash &= htabmask; 128 129 pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash; 130 131 dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n", 132 kvmppc_get_pc(&vcpu_book3s->vcpu), eaddr, vcpu_book3s->sdr1, pteg, 133 sr_vsid(sre)); 134 135 r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT); 136 if (kvm_is_error_hva(r)) 137 return r; 138 return r | (pteg & ~PAGE_MASK); 139 } 140 141 static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary) 142 { 143 return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 7) | 144 (primary ? 0 : 0x40) | 0x80000000; 145 } 146 147 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, 148 struct kvmppc_pte *pte, bool data) 149 { 150 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 151 struct kvmppc_bat *bat; 152 int i; 153 154 for (i = 0; i < 8; i++) { 155 if (data) 156 bat = &vcpu_book3s->dbat[i]; 157 else 158 bat = &vcpu_book3s->ibat[i]; 159 160 if (vcpu->arch.shared->msr & MSR_PR) { 161 if (!bat->vp) 162 continue; 163 } else { 164 if (!bat->vs) 165 continue; 166 } 167 168 if (check_debug_ip(vcpu)) 169 { 170 dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n", 171 data ? 'd' : 'i', i, eaddr, bat->bepi, 172 bat->bepi_mask); 173 } 174 if ((eaddr & bat->bepi_mask) == bat->bepi) { 175 u64 vsid; 176 kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, 177 eaddr >> SID_SHIFT, &vsid); 178 vsid <<= 16; 179 pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid; 180 181 pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask); 182 pte->may_read = bat->pp; 183 pte->may_write = bat->pp > 1; 184 pte->may_execute = true; 185 if (!pte->may_read) { 186 printk(KERN_INFO "BAT is not readable!\n"); 187 continue; 188 } 189 if (!pte->may_write) { 190 /* let's treat r/o BATs as not-readable for now */ 191 dprintk_pte("BAT is read-only!\n"); 192 continue; 193 } 194 195 return 0; 196 } 197 } 198 199 return -ENOENT; 200 } 201 202 static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr, 203 struct kvmppc_pte *pte, bool data, 204 bool primary) 205 { 206 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 207 u32 sre; 208 hva_t ptegp; 209 u32 pteg[16]; 210 u32 ptem = 0; 211 int i; 212 int found = 0; 213 214 sre = find_sr(vcpu, eaddr); 215 216 dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28, 217 sr_vsid(sre), sre); 218 219 pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); 220 221 ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu_book3s, sre, eaddr, primary); 222 if (kvm_is_error_hva(ptegp)) { 223 printk(KERN_INFO "KVM: Invalid PTEG!\n"); 224 goto no_page_found; 225 } 226 227 ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary); 228 229 if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) { 230 printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp); 231 goto no_page_found; 232 } 233 234 for (i=0; i<16; i+=2) { 235 if (ptem == pteg[i]) { 236 u8 pp; 237 238 pte->raddr = (pteg[i+1] & ~(0xFFFULL)) | (eaddr & 0xFFF); 239 pp = pteg[i+1] & 3; 240 241 if ((sr_kp(sre) && (vcpu->arch.shared->msr & MSR_PR)) || 242 (sr_ks(sre) && !(vcpu->arch.shared->msr & MSR_PR))) 243 pp |= 4; 244 245 pte->may_write = false; 246 pte->may_read = false; 247 pte->may_execute = true; 248 switch (pp) { 249 case 0: 250 case 1: 251 case 2: 252 case 6: 253 pte->may_write = true; 254 case 3: 255 case 5: 256 case 7: 257 pte->may_read = true; 258 break; 259 } 260 261 if ( !pte->may_read ) 262 continue; 263 264 dprintk_pte("MMU: Found PTE -> %x %x - %x\n", 265 pteg[i], pteg[i+1], pp); 266 found = 1; 267 break; 268 } 269 } 270 271 /* Update PTE C and A bits, so the guest's swapper knows we used the 272 page */ 273 if (found) { 274 u32 oldpte = pteg[i+1]; 275 276 if (pte->may_read) 277 pteg[i+1] |= PTEG_FLAG_ACCESSED; 278 if (pte->may_write) 279 pteg[i+1] |= PTEG_FLAG_DIRTY; 280 else 281 dprintk_pte("KVM: Mapping read-only page!\n"); 282 283 /* Write back into the PTEG */ 284 if (pteg[i+1] != oldpte) 285 copy_to_user((void __user *)ptegp, pteg, sizeof(pteg)); 286 287 return 0; 288 } 289 290 no_page_found: 291 292 if (check_debug_ip(vcpu)) { 293 dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n", 294 to_book3s(vcpu)->sdr1, ptegp); 295 for (i=0; i<16; i+=2) { 296 dprintk_pte(" %02d: 0x%x - 0x%x (0x%x)\n", 297 i, pteg[i], pteg[i+1], ptem); 298 } 299 } 300 301 return -ENOENT; 302 } 303 304 static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, 305 struct kvmppc_pte *pte, bool data) 306 { 307 int r; 308 ulong mp_ea = vcpu->arch.magic_page_ea; 309 310 pte->eaddr = eaddr; 311 312 /* Magic page override */ 313 if (unlikely(mp_ea) && 314 unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) && 315 !(vcpu->arch.shared->msr & MSR_PR)) { 316 pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); 317 pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff); 318 pte->raddr &= KVM_PAM; 319 pte->may_execute = true; 320 pte->may_read = true; 321 pte->may_write = true; 322 323 return 0; 324 } 325 326 r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data); 327 if (r < 0) 328 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, true); 329 if (r < 0) 330 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, false); 331 332 return r; 333 } 334 335 336 static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum) 337 { 338 return vcpu->arch.shared->sr[srnum]; 339 } 340 341 static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, 342 ulong value) 343 { 344 vcpu->arch.shared->sr[srnum] = value; 345 kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT); 346 } 347 348 static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large) 349 { 350 kvmppc_mmu_pte_flush(vcpu, ea, 0x0FFFF000); 351 } 352 353 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, 354 u64 *vsid) 355 { 356 ulong ea = esid << SID_SHIFT; 357 u32 sr; 358 u64 gvsid = esid; 359 360 if (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) { 361 sr = find_sr(vcpu, ea); 362 if (sr_valid(sr)) 363 gvsid = sr_vsid(sr); 364 } 365 366 /* In case we only have one of MSR_IR or MSR_DR set, let's put 367 that in the real-mode context (and hope RM doesn't access 368 high memory) */ 369 switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) { 370 case 0: 371 *vsid = VSID_REAL | esid; 372 break; 373 case MSR_IR: 374 *vsid = VSID_REAL_IR | gvsid; 375 break; 376 case MSR_DR: 377 *vsid = VSID_REAL_DR | gvsid; 378 break; 379 case MSR_DR|MSR_IR: 380 if (sr_valid(sr)) 381 *vsid = sr_vsid(sr); 382 else 383 *vsid = VSID_BAT | gvsid; 384 break; 385 default: 386 BUG(); 387 } 388 389 if (vcpu->arch.shared->msr & MSR_PR) 390 *vsid |= VSID_PR; 391 392 return 0; 393 } 394 395 static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu) 396 { 397 return true; 398 } 399 400 401 void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu) 402 { 403 struct kvmppc_mmu *mmu = &vcpu->arch.mmu; 404 405 mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin; 406 mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin; 407 mmu->xlate = kvmppc_mmu_book3s_32_xlate; 408 mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr; 409 mmu->tlbie = kvmppc_mmu_book3s_32_tlbie; 410 mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid; 411 mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp; 412 mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32; 413 414 mmu->slbmte = NULL; 415 mmu->slbmfee = NULL; 416 mmu->slbmfev = NULL; 417 mmu->slbie = NULL; 418 mmu->slbia = NULL; 419 } 420