1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved. 4 * 5 * Authors: 6 * Alexander Graf <agraf@suse.de> 7 */ 8 9 #include <linux/kvm_host.h> 10 11 #include <asm/kvm_ppc.h> 12 #include <asm/kvm_book3s.h> 13 #include <asm/book3s/32/mmu-hash.h> 14 #include <asm/machdep.h> 15 #include <asm/mmu_context.h> 16 #include <asm/hw_irq.h> 17 #include "book3s.h" 18 19 /* #define DEBUG_MMU */ 20 /* #define DEBUG_SR */ 21 22 #ifdef DEBUG_MMU 23 #define dprintk_mmu(a, ...) printk(KERN_INFO a, __VA_ARGS__) 24 #else 25 #define dprintk_mmu(a, ...) do { } while(0) 26 #endif 27 28 #ifdef DEBUG_SR 29 #define dprintk_sr(a, ...) printk(KERN_INFO a, __VA_ARGS__) 30 #else 31 #define dprintk_sr(a, ...) do { } while(0) 32 #endif 33 34 #if PAGE_SHIFT != 12 35 #error Unknown page size 36 #endif 37 38 #ifdef CONFIG_SMP 39 #error XXX need to grab mmu_hash_lock 40 #endif 41 42 #ifdef CONFIG_PTE_64BIT 43 #error Only 32 bit pages are supported for now 44 #endif 45 46 static ulong htab; 47 static u32 htabmask; 48 49 void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte) 50 { 51 volatile u32 *pteg; 52 53 /* Remove from host HTAB */ 54 pteg = (u32*)pte->slot; 55 pteg[0] = 0; 56 57 /* And make sure it's gone from the TLB too */ 58 asm volatile ("sync"); 59 asm volatile ("tlbie %0" : : "r" (pte->pte.eaddr) : "memory"); 60 asm volatile ("sync"); 61 asm volatile ("tlbsync"); 62 } 63 64 /* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using 65 * a hash, so we don't waste cycles on looping */ 66 static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid) 67 { 68 return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^ 69 ((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^ 70 ((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^ 71 ((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^ 72 ((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^ 73 ((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^ 74 ((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^ 75 ((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK)); 76 } 77 78 79 static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid) 80 { 81 struct kvmppc_sid_map *map; 82 u16 sid_map_mask; 83 84 if (kvmppc_get_msr(vcpu) & MSR_PR) 85 gvsid |= VSID_PR; 86 87 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid); 88 map = &to_book3s(vcpu)->sid_map[sid_map_mask]; 89 if (map->guest_vsid == gvsid) { 90 dprintk_sr("SR: Searching 0x%llx -> 0x%llx\n", 91 gvsid, map->host_vsid); 92 return map; 93 } 94 95 map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask]; 96 if (map->guest_vsid == gvsid) { 97 dprintk_sr("SR: Searching 0x%llx -> 0x%llx\n", 98 gvsid, map->host_vsid); 99 return map; 100 } 101 102 dprintk_sr("SR: Searching 0x%llx -> not found\n", gvsid); 103 return NULL; 104 } 105 106 static u32 *kvmppc_mmu_get_pteg(struct kvm_vcpu *vcpu, u32 vsid, u32 eaddr, 107 bool primary) 108 { 109 u32 page, hash; 110 ulong pteg = htab; 111 112 page = (eaddr & ~ESID_MASK) >> 12; 113 114 hash = ((vsid ^ page) << 6); 115 if (!primary) 116 hash = ~hash; 117 118 hash &= htabmask; 119 120 pteg |= hash; 121 122 dprintk_mmu("htab: %lx | hash: %x | htabmask: %x | pteg: %lx\n", 123 htab, hash, htabmask, pteg); 124 125 return (u32*)pteg; 126 } 127 128 extern char etext[]; 129 130 int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte, 131 bool iswrite) 132 { 133 kvm_pfn_t hpaddr; 134 u64 vpn; 135 u64 vsid; 136 struct kvmppc_sid_map *map; 137 volatile u32 *pteg; 138 u32 eaddr = orig_pte->eaddr; 139 u32 pteg0, pteg1; 140 register int rr = 0; 141 bool primary = false; 142 bool evict = false; 143 struct hpte_cache *pte; 144 int r = 0; 145 bool writable; 146 147 /* Get host physical address for gpa */ 148 hpaddr = kvmppc_gpa_to_pfn(vcpu, orig_pte->raddr, iswrite, &writable); 149 if (is_error_noslot_pfn(hpaddr)) { 150 printk(KERN_INFO "Couldn't get guest page for gpa %lx!\n", 151 orig_pte->raddr); 152 r = -EINVAL; 153 goto out; 154 } 155 hpaddr <<= PAGE_SHIFT; 156 157 /* and write the mapping ea -> hpa into the pt */ 158 vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid); 159 map = find_sid_vsid(vcpu, vsid); 160 if (!map) { 161 kvmppc_mmu_map_segment(vcpu, eaddr); 162 map = find_sid_vsid(vcpu, vsid); 163 } 164 BUG_ON(!map); 165 166 vsid = map->host_vsid; 167 vpn = (vsid << (SID_SHIFT - VPN_SHIFT)) | 168 ((eaddr & ~ESID_MASK) >> VPN_SHIFT); 169 next_pteg: 170 if (rr == 16) { 171 primary = !primary; 172 evict = true; 173 rr = 0; 174 } 175 176 pteg = kvmppc_mmu_get_pteg(vcpu, vsid, eaddr, primary); 177 178 /* not evicting yet */ 179 if (!evict && (pteg[rr] & PTE_V)) { 180 rr += 2; 181 goto next_pteg; 182 } 183 184 dprintk_mmu("KVM: old PTEG: %p (%d)\n", pteg, rr); 185 dprintk_mmu("KVM: %08x - %08x\n", pteg[0], pteg[1]); 186 dprintk_mmu("KVM: %08x - %08x\n", pteg[2], pteg[3]); 187 dprintk_mmu("KVM: %08x - %08x\n", pteg[4], pteg[5]); 188 dprintk_mmu("KVM: %08x - %08x\n", pteg[6], pteg[7]); 189 dprintk_mmu("KVM: %08x - %08x\n", pteg[8], pteg[9]); 190 dprintk_mmu("KVM: %08x - %08x\n", pteg[10], pteg[11]); 191 dprintk_mmu("KVM: %08x - %08x\n", pteg[12], pteg[13]); 192 dprintk_mmu("KVM: %08x - %08x\n", pteg[14], pteg[15]); 193 194 pteg0 = ((eaddr & 0x0fffffff) >> 22) | (vsid << 7) | PTE_V | 195 (primary ? 0 : PTE_SEC); 196 pteg1 = hpaddr | PTE_M | PTE_R | PTE_C; 197 198 if (orig_pte->may_write && writable) { 199 pteg1 |= PP_RWRW; 200 mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT); 201 } else { 202 pteg1 |= PP_RWRX; 203 } 204 205 if (orig_pte->may_execute) 206 kvmppc_mmu_flush_icache(hpaddr >> PAGE_SHIFT); 207 208 local_irq_disable(); 209 210 if (pteg[rr]) { 211 pteg[rr] = 0; 212 asm volatile ("sync"); 213 } 214 pteg[rr + 1] = pteg1; 215 pteg[rr] = pteg0; 216 asm volatile ("sync"); 217 218 local_irq_enable(); 219 220 dprintk_mmu("KVM: new PTEG: %p\n", pteg); 221 dprintk_mmu("KVM: %08x - %08x\n", pteg[0], pteg[1]); 222 dprintk_mmu("KVM: %08x - %08x\n", pteg[2], pteg[3]); 223 dprintk_mmu("KVM: %08x - %08x\n", pteg[4], pteg[5]); 224 dprintk_mmu("KVM: %08x - %08x\n", pteg[6], pteg[7]); 225 dprintk_mmu("KVM: %08x - %08x\n", pteg[8], pteg[9]); 226 dprintk_mmu("KVM: %08x - %08x\n", pteg[10], pteg[11]); 227 dprintk_mmu("KVM: %08x - %08x\n", pteg[12], pteg[13]); 228 dprintk_mmu("KVM: %08x - %08x\n", pteg[14], pteg[15]); 229 230 231 /* Now tell our Shadow PTE code about the new page */ 232 233 pte = kvmppc_mmu_hpte_cache_next(vcpu); 234 if (!pte) { 235 kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT); 236 r = -EAGAIN; 237 goto out; 238 } 239 240 dprintk_mmu("KVM: %c%c Map 0x%llx: [%lx] 0x%llx (0x%llx) -> %lx\n", 241 orig_pte->may_write ? 'w' : '-', 242 orig_pte->may_execute ? 'x' : '-', 243 orig_pte->eaddr, (ulong)pteg, vpn, 244 orig_pte->vpage, hpaddr); 245 246 pte->slot = (ulong)&pteg[rr]; 247 pte->host_vpn = vpn; 248 pte->pte = *orig_pte; 249 pte->pfn = hpaddr >> PAGE_SHIFT; 250 251 kvmppc_mmu_hpte_cache_map(vcpu, pte); 252 253 kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT); 254 out: 255 return r; 256 } 257 258 void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte) 259 { 260 kvmppc_mmu_pte_vflush(vcpu, pte->vpage, 0xfffffffffULL); 261 } 262 263 static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid) 264 { 265 struct kvmppc_sid_map *map; 266 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 267 u16 sid_map_mask; 268 static int backwards_map = 0; 269 270 if (kvmppc_get_msr(vcpu) & MSR_PR) 271 gvsid |= VSID_PR; 272 273 /* We might get collisions that trap in preceding order, so let's 274 map them differently */ 275 276 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid); 277 if (backwards_map) 278 sid_map_mask = SID_MAP_MASK - sid_map_mask; 279 280 map = &to_book3s(vcpu)->sid_map[sid_map_mask]; 281 282 /* Make sure we're taking the other map next time */ 283 backwards_map = !backwards_map; 284 285 /* Uh-oh ... out of mappings. Let's flush! */ 286 if (vcpu_book3s->vsid_next >= VSID_POOL_SIZE) { 287 vcpu_book3s->vsid_next = 0; 288 memset(vcpu_book3s->sid_map, 0, 289 sizeof(struct kvmppc_sid_map) * SID_MAP_NUM); 290 kvmppc_mmu_pte_flush(vcpu, 0, 0); 291 kvmppc_mmu_flush_segments(vcpu); 292 } 293 map->host_vsid = vcpu_book3s->vsid_pool[vcpu_book3s->vsid_next]; 294 vcpu_book3s->vsid_next++; 295 296 map->guest_vsid = gvsid; 297 map->valid = true; 298 299 return map; 300 } 301 302 int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr) 303 { 304 u32 esid = eaddr >> SID_SHIFT; 305 u64 gvsid; 306 u32 sr; 307 struct kvmppc_sid_map *map; 308 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); 309 int r = 0; 310 311 if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) { 312 /* Invalidate an entry */ 313 svcpu->sr[esid] = SR_INVALID; 314 r = -ENOENT; 315 goto out; 316 } 317 318 map = find_sid_vsid(vcpu, gvsid); 319 if (!map) 320 map = create_sid_map(vcpu, gvsid); 321 322 map->guest_esid = esid; 323 sr = map->host_vsid | SR_KP; 324 svcpu->sr[esid] = sr; 325 326 dprintk_sr("MMU: mtsr %d, 0x%x\n", esid, sr); 327 328 out: 329 svcpu_put(svcpu); 330 return r; 331 } 332 333 void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu) 334 { 335 int i; 336 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); 337 338 dprintk_sr("MMU: flushing all segments (%d)\n", ARRAY_SIZE(svcpu->sr)); 339 for (i = 0; i < ARRAY_SIZE(svcpu->sr); i++) 340 svcpu->sr[i] = SR_INVALID; 341 342 svcpu_put(svcpu); 343 } 344 345 void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu) 346 { 347 int i; 348 349 kvmppc_mmu_hpte_destroy(vcpu); 350 preempt_disable(); 351 for (i = 0; i < SID_CONTEXTS; i++) 352 __destroy_context(to_book3s(vcpu)->context_id[i]); 353 preempt_enable(); 354 } 355 356 /* From mm/mmu_context_hash32.c */ 357 #define CTX_TO_VSID(c, id) ((((c) * (897 * 16)) + (id * 0x111)) & 0xffffff) 358 359 int kvmppc_mmu_init(struct kvm_vcpu *vcpu) 360 { 361 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu); 362 int err; 363 ulong sdr1; 364 int i; 365 int j; 366 367 for (i = 0; i < SID_CONTEXTS; i++) { 368 err = __init_new_context(); 369 if (err < 0) 370 goto init_fail; 371 vcpu3s->context_id[i] = err; 372 373 /* Remember context id for this combination */ 374 for (j = 0; j < 16; j++) 375 vcpu3s->vsid_pool[(i * 16) + j] = CTX_TO_VSID(err, j); 376 } 377 378 vcpu3s->vsid_next = 0; 379 380 /* Remember where the HTAB is */ 381 asm ( "mfsdr1 %0" : "=r"(sdr1) ); 382 htabmask = ((sdr1 & 0x1FF) << 16) | 0xFFC0; 383 htab = (ulong)__va(sdr1 & 0xffff0000); 384 385 kvmppc_mmu_hpte_init(vcpu); 386 387 return 0; 388 389 init_fail: 390 for (j = 0; j < i; j++) { 391 if (!vcpu3s->context_id[j]) 392 continue; 393 394 __destroy_context(to_book3s(vcpu)->context_id[j]); 395 } 396 397 return -1; 398 } 399