1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * Copyright SUSE Linux Products GmbH 2009 5 * 6 * Authors: Alexander Graf <agraf@suse.de> 7 */ 8 9 #include <linux/types.h> 10 #include <linux/string.h> 11 #include <linux/kvm.h> 12 #include <linux/kvm_host.h> 13 #include <linux/highmem.h> 14 15 #include <asm/kvm_ppc.h> 16 #include <asm/kvm_book3s.h> 17 18 /* #define DEBUG_MMU */ 19 /* #define DEBUG_MMU_PTE */ 20 /* #define DEBUG_MMU_PTE_IP 0xfff14c40 */ 21 22 #ifdef DEBUG_MMU 23 #define dprintk(X...) printk(KERN_INFO X) 24 #else 25 #define dprintk(X...) do { } while(0) 26 #endif 27 28 #ifdef DEBUG_MMU_PTE 29 #define dprintk_pte(X...) printk(KERN_INFO X) 30 #else 31 #define dprintk_pte(X...) do { } while(0) 32 #endif 33 34 #define PTEG_FLAG_ACCESSED 0x00000100 35 #define PTEG_FLAG_DIRTY 0x00000080 36 #ifndef SID_SHIFT 37 #define SID_SHIFT 28 38 #endif 39 40 static inline bool check_debug_ip(struct kvm_vcpu *vcpu) 41 { 42 #ifdef DEBUG_MMU_PTE_IP 43 return vcpu->arch.regs.nip == DEBUG_MMU_PTE_IP; 44 #else 45 return true; 46 #endif 47 } 48 49 static inline u32 sr_vsid(u32 sr_raw) 50 { 51 return sr_raw & 0x0fffffff; 52 } 53 54 static inline bool sr_valid(u32 sr_raw) 55 { 56 return (sr_raw & 0x80000000) ? false : true; 57 } 58 59 static inline bool sr_ks(u32 sr_raw) 60 { 61 return (sr_raw & 0x40000000) ? true: false; 62 } 63 64 static inline bool sr_kp(u32 sr_raw) 65 { 66 return (sr_raw & 0x20000000) ? true: false; 67 } 68 69 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, 70 struct kvmppc_pte *pte, bool data, 71 bool iswrite); 72 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, 73 u64 *vsid); 74 75 static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr) 76 { 77 return kvmppc_get_sr(vcpu, (eaddr >> 28) & 0xf); 78 } 79 80 static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr, 81 bool data) 82 { 83 u64 vsid; 84 struct kvmppc_pte pte; 85 86 if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data, false)) 87 return pte.vpage; 88 89 kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid); 90 return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16); 91 } 92 93 static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu, 94 u32 sre, gva_t eaddr, 95 bool primary) 96 { 97 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 98 u32 page, hash, pteg, htabmask; 99 hva_t r; 100 101 page = (eaddr & 0x0FFFFFFF) >> 12; 102 htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0; 103 104 hash = ((sr_vsid(sre) ^ page) << 6); 105 if (!primary) 106 hash = ~hash; 107 hash &= htabmask; 108 109 pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash; 110 111 dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n", 112 kvmppc_get_pc(vcpu), eaddr, vcpu_book3s->sdr1, pteg, 113 sr_vsid(sre)); 114 115 r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT); 116 if (kvm_is_error_hva(r)) 117 return r; 118 return r | (pteg & ~PAGE_MASK); 119 } 120 121 static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary) 122 { 123 return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 7) | 124 (primary ? 0 : 0x40) | 0x80000000; 125 } 126 127 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr, 128 struct kvmppc_pte *pte, bool data, 129 bool iswrite) 130 { 131 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 132 struct kvmppc_bat *bat; 133 int i; 134 135 for (i = 0; i < 8; i++) { 136 if (data) 137 bat = &vcpu_book3s->dbat[i]; 138 else 139 bat = &vcpu_book3s->ibat[i]; 140 141 if (kvmppc_get_msr(vcpu) & MSR_PR) { 142 if (!bat->vp) 143 continue; 144 } else { 145 if (!bat->vs) 146 continue; 147 } 148 149 if (check_debug_ip(vcpu)) 150 { 151 dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n", 152 data ? 'd' : 'i', i, eaddr, bat->bepi, 153 bat->bepi_mask); 154 } 155 if ((eaddr & bat->bepi_mask) == bat->bepi) { 156 u64 vsid; 157 kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, 158 eaddr >> SID_SHIFT, &vsid); 159 vsid <<= 16; 160 pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid; 161 162 pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask); 163 pte->may_read = bat->pp; 164 pte->may_write = bat->pp > 1; 165 pte->may_execute = true; 166 if (!pte->may_read) { 167 printk(KERN_INFO "BAT is not readable!\n"); 168 continue; 169 } 170 if (iswrite && !pte->may_write) { 171 dprintk_pte("BAT is read-only!\n"); 172 continue; 173 } 174 175 return 0; 176 } 177 } 178 179 return -ENOENT; 180 } 181 182 static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr, 183 struct kvmppc_pte *pte, bool data, 184 bool iswrite, bool primary) 185 { 186 u32 sre; 187 hva_t ptegp; 188 u32 pteg[16]; 189 u32 pte0, pte1; 190 u32 ptem = 0; 191 int i; 192 int found = 0; 193 194 sre = find_sr(vcpu, eaddr); 195 196 dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28, 197 sr_vsid(sre), sre); 198 199 pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); 200 201 ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, sre, eaddr, primary); 202 if (kvm_is_error_hva(ptegp)) { 203 printk(KERN_INFO "KVM: Invalid PTEG!\n"); 204 goto no_page_found; 205 } 206 207 ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary); 208 209 if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) { 210 printk_ratelimited(KERN_ERR 211 "KVM: Can't copy data from 0x%lx!\n", ptegp); 212 goto no_page_found; 213 } 214 215 for (i=0; i<16; i+=2) { 216 pte0 = be32_to_cpu(pteg[i]); 217 pte1 = be32_to_cpu(pteg[i + 1]); 218 if (ptem == pte0) { 219 u8 pp; 220 221 pte->raddr = (pte1 & ~(0xFFFULL)) | (eaddr & 0xFFF); 222 pp = pte1 & 3; 223 224 if ((sr_kp(sre) && (kvmppc_get_msr(vcpu) & MSR_PR)) || 225 (sr_ks(sre) && !(kvmppc_get_msr(vcpu) & MSR_PR))) 226 pp |= 4; 227 228 pte->may_write = false; 229 pte->may_read = false; 230 pte->may_execute = true; 231 switch (pp) { 232 case 0: 233 case 1: 234 case 2: 235 case 6: 236 pte->may_write = true; 237 fallthrough; 238 case 3: 239 case 5: 240 case 7: 241 pte->may_read = true; 242 break; 243 } 244 245 dprintk_pte("MMU: Found PTE -> %x %x - %x\n", 246 pte0, pte1, pp); 247 found = 1; 248 break; 249 } 250 } 251 252 /* Update PTE C and A bits, so the guest's swapper knows we used the 253 page */ 254 if (found) { 255 u32 pte_r = pte1; 256 char __user *addr = (char __user *) (ptegp + (i+1) * sizeof(u32)); 257 258 /* 259 * Use single-byte writes to update the HPTE, to 260 * conform to what real hardware does. 261 */ 262 if (pte->may_read && !(pte_r & PTEG_FLAG_ACCESSED)) { 263 pte_r |= PTEG_FLAG_ACCESSED; 264 put_user(pte_r >> 8, addr + 2); 265 } 266 if (iswrite && pte->may_write && !(pte_r & PTEG_FLAG_DIRTY)) { 267 pte_r |= PTEG_FLAG_DIRTY; 268 put_user(pte_r, addr + 3); 269 } 270 if (!pte->may_read || (iswrite && !pte->may_write)) 271 return -EPERM; 272 return 0; 273 } 274 275 no_page_found: 276 277 if (check_debug_ip(vcpu)) { 278 dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n", 279 to_book3s(vcpu)->sdr1, ptegp); 280 for (i=0; i<16; i+=2) { 281 dprintk_pte(" %02d: 0x%x - 0x%x (0x%x)\n", 282 i, be32_to_cpu(pteg[i]), 283 be32_to_cpu(pteg[i+1]), ptem); 284 } 285 } 286 287 return -ENOENT; 288 } 289 290 static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, 291 struct kvmppc_pte *pte, bool data, 292 bool iswrite) 293 { 294 int r; 295 ulong mp_ea = vcpu->arch.magic_page_ea; 296 297 pte->eaddr = eaddr; 298 pte->page_size = MMU_PAGE_4K; 299 300 /* Magic page override */ 301 if (unlikely(mp_ea) && 302 unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) && 303 !(kvmppc_get_msr(vcpu) & MSR_PR)) { 304 pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data); 305 pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff); 306 pte->raddr &= KVM_PAM; 307 pte->may_execute = true; 308 pte->may_read = true; 309 pte->may_write = true; 310 311 return 0; 312 } 313 314 r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data, iswrite); 315 if (r < 0) 316 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, 317 data, iswrite, true); 318 if (r == -ENOENT) 319 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, 320 data, iswrite, false); 321 322 return r; 323 } 324 325 326 static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum) 327 { 328 return kvmppc_get_sr(vcpu, srnum); 329 } 330 331 static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum, 332 ulong value) 333 { 334 kvmppc_set_sr(vcpu, srnum, value); 335 kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT); 336 } 337 338 static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large) 339 { 340 unsigned long i; 341 struct kvm_vcpu *v; 342 343 /* flush this VA on all cpus */ 344 kvm_for_each_vcpu(i, v, vcpu->kvm) 345 kvmppc_mmu_pte_flush(v, ea, 0x0FFFF000); 346 } 347 348 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, 349 u64 *vsid) 350 { 351 ulong ea = esid << SID_SHIFT; 352 u32 sr; 353 u64 gvsid = esid; 354 u64 msr = kvmppc_get_msr(vcpu); 355 356 if (msr & (MSR_DR|MSR_IR)) { 357 sr = find_sr(vcpu, ea); 358 if (sr_valid(sr)) 359 gvsid = sr_vsid(sr); 360 } 361 362 /* In case we only have one of MSR_IR or MSR_DR set, let's put 363 that in the real-mode context (and hope RM doesn't access 364 high memory) */ 365 switch (msr & (MSR_DR|MSR_IR)) { 366 case 0: 367 *vsid = VSID_REAL | esid; 368 break; 369 case MSR_IR: 370 *vsid = VSID_REAL_IR | gvsid; 371 break; 372 case MSR_DR: 373 *vsid = VSID_REAL_DR | gvsid; 374 break; 375 case MSR_DR|MSR_IR: 376 if (sr_valid(sr)) 377 *vsid = sr_vsid(sr); 378 else 379 *vsid = VSID_BAT | gvsid; 380 break; 381 default: 382 BUG(); 383 } 384 385 if (msr & MSR_PR) 386 *vsid |= VSID_PR; 387 388 return 0; 389 } 390 391 static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu) 392 { 393 return true; 394 } 395 396 397 void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu) 398 { 399 struct kvmppc_mmu *mmu = &vcpu->arch.mmu; 400 401 mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin; 402 mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin; 403 mmu->xlate = kvmppc_mmu_book3s_32_xlate; 404 mmu->tlbie = kvmppc_mmu_book3s_32_tlbie; 405 mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid; 406 mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp; 407 mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32; 408 409 mmu->slbmte = NULL; 410 mmu->slbmfee = NULL; 411 mmu->slbmfev = NULL; 412 mmu->slbfee = NULL; 413 mmu->slbie = NULL; 414 mmu->slbia = NULL; 415 } 416