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 int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, 62 struct kvmppc_pte *pte, bool data); 63 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, 64 u64 *vsid); 65 66 static struct kvmppc_sr *find_sr(struct kvmppc_vcpu_book3s *vcpu_book3s, gva_t eaddr) 67 { 68 return &vcpu_book3s->sr[(eaddr >> 28) & 0xf]; 69 } 70 71 static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr, 72 bool data) 73 { 74 u64 vsid; 75 struct kvmppc_pte pte; 76 77 if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data)) 78 return pte.vpage; 79 80 kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid); 81 return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16); 82 } 83 84 static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu) 85 { 86 kvmppc_set_msr(vcpu, 0); 87 } 88 89 static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvmppc_vcpu_book3s *vcpu_book3s, 90 struct kvmppc_sr *sre, gva_t eaddr, 91 bool primary) 92 { 93 u32 page, hash, pteg, htabmask; 94 hva_t r; 95 96 page = (eaddr & 0x0FFFFFFF) >> 12; 97 htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0; 98 99 hash = ((sre->vsid ^ page) << 6); 100 if (!primary) 101 hash = ~hash; 102 hash &= htabmask; 103 104 pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash; 105 106 dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n", 107 vcpu_book3s->vcpu.arch.pc, eaddr, vcpu_book3s->sdr1, pteg, 108 sre->vsid); 109 110 r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT); 111 if (kvm_is_error_hva(r)) 112 return r; 113 return r | (pteg & ~PAGE_MASK); 114 } 115 116 static u32 kvmppc_mmu_book3s_32_get_ptem(struct kvmppc_sr *sre, gva_t eaddr, 117 bool primary) 118 { 119 return ((eaddr & 0x0fffffff) >> 22) | (sre->vsid << 7) | 120 (primary ? 0 : 0x40) | 0x80000000; 121 } 122 123 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, 124 struct kvmppc_pte *pte, bool data) 125 { 126 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 127 struct kvmppc_bat *bat; 128 int i; 129 130 for (i = 0; i < 8; i++) { 131 if (data) 132 bat = &vcpu_book3s->dbat[i]; 133 else 134 bat = &vcpu_book3s->ibat[i]; 135 136 if (vcpu->arch.msr & MSR_PR) { 137 if (!bat->vp) 138 continue; 139 } else { 140 if (!bat->vs) 141 continue; 142 } 143 144 if (check_debug_ip(vcpu)) 145 { 146 dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n", 147 data ? 'd' : 'i', i, eaddr, bat->bepi, 148 bat->bepi_mask); 149 } 150 if ((eaddr & bat->bepi_mask) == bat->bepi) { 151 u64 vsid; 152 kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, 153 eaddr >> SID_SHIFT, &vsid); 154 vsid <<= 16; 155 pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid; 156 157 pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask); 158 pte->may_read = bat->pp; 159 pte->may_write = bat->pp > 1; 160 pte->may_execute = true; 161 if (!pte->may_read) { 162 printk(KERN_INFO "BAT is not readable!\n"); 163 continue; 164 } 165 if (!pte->may_write) { 166 /* let's treat r/o BATs as not-readable for now */ 167 dprintk_pte("BAT is read-only!\n"); 168 continue; 169 } 170 171 return 0; 172 } 173 } 174 175 return -ENOENT; 176 } 177 178 static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr, 179 struct kvmppc_pte *pte, bool data, 180 bool primary) 181 { 182 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 183 struct kvmppc_sr *sre; 184 hva_t ptegp; 185 u32 pteg[16]; 186 u32 ptem = 0; 187 int i; 188 int found = 0; 189 190 sre = find_sr(vcpu_book3s, eaddr); 191 192 dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28, 193 sre->vsid, sre->raw); 194 195 pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); 196 197 ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu_book3s, sre, eaddr, primary); 198 if (kvm_is_error_hva(ptegp)) { 199 printk(KERN_INFO "KVM: Invalid PTEG!\n"); 200 goto no_page_found; 201 } 202 203 ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary); 204 205 if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) { 206 printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp); 207 goto no_page_found; 208 } 209 210 for (i=0; i<16; i+=2) { 211 if (ptem == pteg[i]) { 212 u8 pp; 213 214 pte->raddr = (pteg[i+1] & ~(0xFFFULL)) | (eaddr & 0xFFF); 215 pp = pteg[i+1] & 3; 216 217 if ((sre->Kp && (vcpu->arch.msr & MSR_PR)) || 218 (sre->Ks && !(vcpu->arch.msr & MSR_PR))) 219 pp |= 4; 220 221 pte->may_write = false; 222 pte->may_read = false; 223 pte->may_execute = true; 224 switch (pp) { 225 case 0: 226 case 1: 227 case 2: 228 case 6: 229 pte->may_write = true; 230 case 3: 231 case 5: 232 case 7: 233 pte->may_read = true; 234 break; 235 } 236 237 if ( !pte->may_read ) 238 continue; 239 240 dprintk_pte("MMU: Found PTE -> %x %x - %x\n", 241 pteg[i], pteg[i+1], pp); 242 found = 1; 243 break; 244 } 245 } 246 247 /* Update PTE C and A bits, so the guest's swapper knows we used the 248 page */ 249 if (found) { 250 u32 oldpte = pteg[i+1]; 251 252 if (pte->may_read) 253 pteg[i+1] |= PTEG_FLAG_ACCESSED; 254 if (pte->may_write) 255 pteg[i+1] |= PTEG_FLAG_DIRTY; 256 else 257 dprintk_pte("KVM: Mapping read-only page!\n"); 258 259 /* Write back into the PTEG */ 260 if (pteg[i+1] != oldpte) 261 copy_to_user((void __user *)ptegp, pteg, sizeof(pteg)); 262 263 return 0; 264 } 265 266 no_page_found: 267 268 if (check_debug_ip(vcpu)) { 269 dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n", 270 to_book3s(vcpu)->sdr1, ptegp); 271 for (i=0; i<16; i+=2) { 272 dprintk_pte(" %02d: 0x%x - 0x%x (0x%llx)\n", 273 i, pteg[i], pteg[i+1], ptem); 274 } 275 } 276 277 return -ENOENT; 278 } 279 280 static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, 281 struct kvmppc_pte *pte, bool data) 282 { 283 int r; 284 285 pte->eaddr = eaddr; 286 r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data); 287 if (r < 0) 288 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, true); 289 if (r < 0) 290 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, false); 291 292 return r; 293 } 294 295 296 static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum) 297 { 298 return to_book3s(vcpu)->sr[srnum].raw; 299 } 300 301 static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, 302 ulong value) 303 { 304 struct kvmppc_sr *sre; 305 306 sre = &to_book3s(vcpu)->sr[srnum]; 307 308 /* Flush any left-over shadows from the previous SR */ 309 310 /* XXX Not necessary? */ 311 /* kvmppc_mmu_pte_flush(vcpu, ((u64)sre->vsid) << 28, 0xf0000000ULL); */ 312 313 /* And then put in the new SR */ 314 sre->raw = value; 315 sre->vsid = (value & 0x0fffffff); 316 sre->valid = (value & 0x80000000) ? false : true; 317 sre->Ks = (value & 0x40000000) ? true : false; 318 sre->Kp = (value & 0x20000000) ? true : false; 319 sre->nx = (value & 0x10000000) ? true : false; 320 321 /* Map the new segment */ 322 kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT); 323 } 324 325 static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large) 326 { 327 kvmppc_mmu_pte_flush(vcpu, ea, 0x0FFFF000); 328 } 329 330 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, 331 u64 *vsid) 332 { 333 ulong ea = esid << SID_SHIFT; 334 struct kvmppc_sr *sr; 335 u64 gvsid = esid; 336 337 if (vcpu->arch.msr & (MSR_DR|MSR_IR)) { 338 sr = find_sr(to_book3s(vcpu), ea); 339 if (sr->valid) 340 gvsid = sr->vsid; 341 } 342 343 /* In case we only have one of MSR_IR or MSR_DR set, let's put 344 that in the real-mode context (and hope RM doesn't access 345 high memory) */ 346 switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) { 347 case 0: 348 *vsid = VSID_REAL | esid; 349 break; 350 case MSR_IR: 351 *vsid = VSID_REAL_IR | gvsid; 352 break; 353 case MSR_DR: 354 *vsid = VSID_REAL_DR | gvsid; 355 break; 356 case MSR_DR|MSR_IR: 357 if (!sr->valid) 358 return -1; 359 360 *vsid = sr->vsid; 361 break; 362 default: 363 BUG(); 364 } 365 366 if (vcpu->arch.msr & MSR_PR) 367 *vsid |= VSID_PR; 368 369 return 0; 370 } 371 372 static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu) 373 { 374 return true; 375 } 376 377 378 void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu) 379 { 380 struct kvmppc_mmu *mmu = &vcpu->arch.mmu; 381 382 mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin; 383 mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin; 384 mmu->xlate = kvmppc_mmu_book3s_32_xlate; 385 mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr; 386 mmu->tlbie = kvmppc_mmu_book3s_32_tlbie; 387 mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid; 388 mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp; 389 mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32; 390 391 mmu->slbmte = NULL; 392 mmu->slbmfee = NULL; 393 mmu->slbmfev = NULL; 394 mmu->slbie = NULL; 395 mmu->slbia = NULL; 396 } 397