1 /* 2 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved. 3 * Copyright 2010-2011 Freescale Semiconductor, Inc. 4 * 5 * Authors: 6 * Alexander Graf <agraf@suse.de> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License, version 2, as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 20 */ 21 22 #include <linux/kvm_host.h> 23 #include <linux/init.h> 24 #include <linux/export.h> 25 #include <linux/kvm_para.h> 26 #include <linux/slab.h> 27 #include <linux/of.h> 28 29 #include <asm/reg.h> 30 #include <asm/sections.h> 31 #include <asm/cacheflush.h> 32 #include <asm/disassemble.h> 33 #include <asm/ppc-opcode.h> 34 #include <asm/epapr_hcalls.h> 35 36 #define KVM_MAGIC_PAGE (-4096L) 37 #define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x) 38 39 #define KVM_INST_LWZ 0x80000000 40 #define KVM_INST_STW 0x90000000 41 #define KVM_INST_LD 0xe8000000 42 #define KVM_INST_STD 0xf8000000 43 #define KVM_INST_NOP 0x60000000 44 #define KVM_INST_B 0x48000000 45 #define KVM_INST_B_MASK 0x03ffffff 46 #define KVM_INST_B_MAX 0x01ffffff 47 #define KVM_INST_LI 0x38000000 48 49 #define KVM_MASK_RT 0x03e00000 50 #define KVM_RT_30 0x03c00000 51 #define KVM_MASK_RB 0x0000f800 52 #define KVM_INST_MFMSR 0x7c0000a6 53 54 #define SPR_FROM 0 55 #define SPR_TO 0x100 56 57 #define KVM_INST_SPR(sprn, moveto) (0x7c0002a6 | \ 58 (((sprn) & 0x1f) << 16) | \ 59 (((sprn) & 0x3e0) << 6) | \ 60 (moveto)) 61 62 #define KVM_INST_MFSPR(sprn) KVM_INST_SPR(sprn, SPR_FROM) 63 #define KVM_INST_MTSPR(sprn) KVM_INST_SPR(sprn, SPR_TO) 64 65 #define KVM_INST_TLBSYNC 0x7c00046c 66 #define KVM_INST_MTMSRD_L0 0x7c000164 67 #define KVM_INST_MTMSRD_L1 0x7c010164 68 #define KVM_INST_MTMSR 0x7c000124 69 70 #define KVM_INST_WRTEE 0x7c000106 71 #define KVM_INST_WRTEEI_0 0x7c000146 72 #define KVM_INST_WRTEEI_1 0x7c008146 73 74 #define KVM_INST_MTSRIN 0x7c0001e4 75 76 static bool kvm_patching_worked = true; 77 static char kvm_tmp[1024 * 1024]; 78 static int kvm_tmp_index; 79 80 static inline void kvm_patch_ins(u32 *inst, u32 new_inst) 81 { 82 *inst = new_inst; 83 flush_icache_range((ulong)inst, (ulong)inst + 4); 84 } 85 86 static void kvm_patch_ins_ll(u32 *inst, long addr, u32 rt) 87 { 88 #ifdef CONFIG_64BIT 89 kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc)); 90 #else 91 kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000fffc)); 92 #endif 93 } 94 95 static void kvm_patch_ins_ld(u32 *inst, long addr, u32 rt) 96 { 97 #ifdef CONFIG_64BIT 98 kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc)); 99 #else 100 kvm_patch_ins(inst, KVM_INST_LWZ | rt | ((addr + 4) & 0x0000fffc)); 101 #endif 102 } 103 104 static void kvm_patch_ins_lwz(u32 *inst, long addr, u32 rt) 105 { 106 kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000ffff)); 107 } 108 109 static void kvm_patch_ins_std(u32 *inst, long addr, u32 rt) 110 { 111 #ifdef CONFIG_64BIT 112 kvm_patch_ins(inst, KVM_INST_STD | rt | (addr & 0x0000fffc)); 113 #else 114 kvm_patch_ins(inst, KVM_INST_STW | rt | ((addr + 4) & 0x0000fffc)); 115 #endif 116 } 117 118 static void kvm_patch_ins_stw(u32 *inst, long addr, u32 rt) 119 { 120 kvm_patch_ins(inst, KVM_INST_STW | rt | (addr & 0x0000fffc)); 121 } 122 123 static void kvm_patch_ins_nop(u32 *inst) 124 { 125 kvm_patch_ins(inst, KVM_INST_NOP); 126 } 127 128 static void kvm_patch_ins_b(u32 *inst, int addr) 129 { 130 #if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC_BOOK3S) 131 /* On relocatable kernels interrupts handlers and our code 132 can be in different regions, so we don't patch them */ 133 134 if ((ulong)inst < (ulong)&__end_interrupts) 135 return; 136 #endif 137 138 kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK)); 139 } 140 141 static u32 *kvm_alloc(int len) 142 { 143 u32 *p; 144 145 if ((kvm_tmp_index + len) > ARRAY_SIZE(kvm_tmp)) { 146 printk(KERN_ERR "KVM: No more space (%d + %d)\n", 147 kvm_tmp_index, len); 148 kvm_patching_worked = false; 149 return NULL; 150 } 151 152 p = (void*)&kvm_tmp[kvm_tmp_index]; 153 kvm_tmp_index += len; 154 155 return p; 156 } 157 158 extern u32 kvm_emulate_mtmsrd_branch_offs; 159 extern u32 kvm_emulate_mtmsrd_reg_offs; 160 extern u32 kvm_emulate_mtmsrd_orig_ins_offs; 161 extern u32 kvm_emulate_mtmsrd_len; 162 extern u32 kvm_emulate_mtmsrd[]; 163 164 static void kvm_patch_ins_mtmsrd(u32 *inst, u32 rt) 165 { 166 u32 *p; 167 int distance_start; 168 int distance_end; 169 ulong next_inst; 170 171 p = kvm_alloc(kvm_emulate_mtmsrd_len * 4); 172 if (!p) 173 return; 174 175 /* Find out where we are and put everything there */ 176 distance_start = (ulong)p - (ulong)inst; 177 next_inst = ((ulong)inst + 4); 178 distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsrd_branch_offs]; 179 180 /* Make sure we only write valid b instructions */ 181 if (distance_start > KVM_INST_B_MAX) { 182 kvm_patching_worked = false; 183 return; 184 } 185 186 /* Modify the chunk to fit the invocation */ 187 memcpy(p, kvm_emulate_mtmsrd, kvm_emulate_mtmsrd_len * 4); 188 p[kvm_emulate_mtmsrd_branch_offs] |= distance_end & KVM_INST_B_MASK; 189 switch (get_rt(rt)) { 190 case 30: 191 kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs], 192 magic_var(scratch2), KVM_RT_30); 193 break; 194 case 31: 195 kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs], 196 magic_var(scratch1), KVM_RT_30); 197 break; 198 default: 199 p[kvm_emulate_mtmsrd_reg_offs] |= rt; 200 break; 201 } 202 203 p[kvm_emulate_mtmsrd_orig_ins_offs] = *inst; 204 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsrd_len * 4); 205 206 /* Patch the invocation */ 207 kvm_patch_ins_b(inst, distance_start); 208 } 209 210 extern u32 kvm_emulate_mtmsr_branch_offs; 211 extern u32 kvm_emulate_mtmsr_reg1_offs; 212 extern u32 kvm_emulate_mtmsr_reg2_offs; 213 extern u32 kvm_emulate_mtmsr_orig_ins_offs; 214 extern u32 kvm_emulate_mtmsr_len; 215 extern u32 kvm_emulate_mtmsr[]; 216 217 static void kvm_patch_ins_mtmsr(u32 *inst, u32 rt) 218 { 219 u32 *p; 220 int distance_start; 221 int distance_end; 222 ulong next_inst; 223 224 p = kvm_alloc(kvm_emulate_mtmsr_len * 4); 225 if (!p) 226 return; 227 228 /* Find out where we are and put everything there */ 229 distance_start = (ulong)p - (ulong)inst; 230 next_inst = ((ulong)inst + 4); 231 distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsr_branch_offs]; 232 233 /* Make sure we only write valid b instructions */ 234 if (distance_start > KVM_INST_B_MAX) { 235 kvm_patching_worked = false; 236 return; 237 } 238 239 /* Modify the chunk to fit the invocation */ 240 memcpy(p, kvm_emulate_mtmsr, kvm_emulate_mtmsr_len * 4); 241 p[kvm_emulate_mtmsr_branch_offs] |= distance_end & KVM_INST_B_MASK; 242 243 /* Make clobbered registers work too */ 244 switch (get_rt(rt)) { 245 case 30: 246 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs], 247 magic_var(scratch2), KVM_RT_30); 248 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs], 249 magic_var(scratch2), KVM_RT_30); 250 break; 251 case 31: 252 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs], 253 magic_var(scratch1), KVM_RT_30); 254 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs], 255 magic_var(scratch1), KVM_RT_30); 256 break; 257 default: 258 p[kvm_emulate_mtmsr_reg1_offs] |= rt; 259 p[kvm_emulate_mtmsr_reg2_offs] |= rt; 260 break; 261 } 262 263 p[kvm_emulate_mtmsr_orig_ins_offs] = *inst; 264 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsr_len * 4); 265 266 /* Patch the invocation */ 267 kvm_patch_ins_b(inst, distance_start); 268 } 269 270 #ifdef CONFIG_BOOKE 271 272 extern u32 kvm_emulate_wrtee_branch_offs; 273 extern u32 kvm_emulate_wrtee_reg_offs; 274 extern u32 kvm_emulate_wrtee_orig_ins_offs; 275 extern u32 kvm_emulate_wrtee_len; 276 extern u32 kvm_emulate_wrtee[]; 277 278 static void kvm_patch_ins_wrtee(u32 *inst, u32 rt, int imm_one) 279 { 280 u32 *p; 281 int distance_start; 282 int distance_end; 283 ulong next_inst; 284 285 p = kvm_alloc(kvm_emulate_wrtee_len * 4); 286 if (!p) 287 return; 288 289 /* Find out where we are and put everything there */ 290 distance_start = (ulong)p - (ulong)inst; 291 next_inst = ((ulong)inst + 4); 292 distance_end = next_inst - (ulong)&p[kvm_emulate_wrtee_branch_offs]; 293 294 /* Make sure we only write valid b instructions */ 295 if (distance_start > KVM_INST_B_MAX) { 296 kvm_patching_worked = false; 297 return; 298 } 299 300 /* Modify the chunk to fit the invocation */ 301 memcpy(p, kvm_emulate_wrtee, kvm_emulate_wrtee_len * 4); 302 p[kvm_emulate_wrtee_branch_offs] |= distance_end & KVM_INST_B_MASK; 303 304 if (imm_one) { 305 p[kvm_emulate_wrtee_reg_offs] = 306 KVM_INST_LI | __PPC_RT(R30) | MSR_EE; 307 } else { 308 /* Make clobbered registers work too */ 309 switch (get_rt(rt)) { 310 case 30: 311 kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs], 312 magic_var(scratch2), KVM_RT_30); 313 break; 314 case 31: 315 kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs], 316 magic_var(scratch1), KVM_RT_30); 317 break; 318 default: 319 p[kvm_emulate_wrtee_reg_offs] |= rt; 320 break; 321 } 322 } 323 324 p[kvm_emulate_wrtee_orig_ins_offs] = *inst; 325 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrtee_len * 4); 326 327 /* Patch the invocation */ 328 kvm_patch_ins_b(inst, distance_start); 329 } 330 331 extern u32 kvm_emulate_wrteei_0_branch_offs; 332 extern u32 kvm_emulate_wrteei_0_len; 333 extern u32 kvm_emulate_wrteei_0[]; 334 335 static void kvm_patch_ins_wrteei_0(u32 *inst) 336 { 337 u32 *p; 338 int distance_start; 339 int distance_end; 340 ulong next_inst; 341 342 p = kvm_alloc(kvm_emulate_wrteei_0_len * 4); 343 if (!p) 344 return; 345 346 /* Find out where we are and put everything there */ 347 distance_start = (ulong)p - (ulong)inst; 348 next_inst = ((ulong)inst + 4); 349 distance_end = next_inst - (ulong)&p[kvm_emulate_wrteei_0_branch_offs]; 350 351 /* Make sure we only write valid b instructions */ 352 if (distance_start > KVM_INST_B_MAX) { 353 kvm_patching_worked = false; 354 return; 355 } 356 357 memcpy(p, kvm_emulate_wrteei_0, kvm_emulate_wrteei_0_len * 4); 358 p[kvm_emulate_wrteei_0_branch_offs] |= distance_end & KVM_INST_B_MASK; 359 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_0_len * 4); 360 361 /* Patch the invocation */ 362 kvm_patch_ins_b(inst, distance_start); 363 } 364 365 #endif 366 367 #ifdef CONFIG_PPC_BOOK3S_32 368 369 extern u32 kvm_emulate_mtsrin_branch_offs; 370 extern u32 kvm_emulate_mtsrin_reg1_offs; 371 extern u32 kvm_emulate_mtsrin_reg2_offs; 372 extern u32 kvm_emulate_mtsrin_orig_ins_offs; 373 extern u32 kvm_emulate_mtsrin_len; 374 extern u32 kvm_emulate_mtsrin[]; 375 376 static void kvm_patch_ins_mtsrin(u32 *inst, u32 rt, u32 rb) 377 { 378 u32 *p; 379 int distance_start; 380 int distance_end; 381 ulong next_inst; 382 383 p = kvm_alloc(kvm_emulate_mtsrin_len * 4); 384 if (!p) 385 return; 386 387 /* Find out where we are and put everything there */ 388 distance_start = (ulong)p - (ulong)inst; 389 next_inst = ((ulong)inst + 4); 390 distance_end = next_inst - (ulong)&p[kvm_emulate_mtsrin_branch_offs]; 391 392 /* Make sure we only write valid b instructions */ 393 if (distance_start > KVM_INST_B_MAX) { 394 kvm_patching_worked = false; 395 return; 396 } 397 398 /* Modify the chunk to fit the invocation */ 399 memcpy(p, kvm_emulate_mtsrin, kvm_emulate_mtsrin_len * 4); 400 p[kvm_emulate_mtsrin_branch_offs] |= distance_end & KVM_INST_B_MASK; 401 p[kvm_emulate_mtsrin_reg1_offs] |= (rb << 10); 402 p[kvm_emulate_mtsrin_reg2_offs] |= rt; 403 p[kvm_emulate_mtsrin_orig_ins_offs] = *inst; 404 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtsrin_len * 4); 405 406 /* Patch the invocation */ 407 kvm_patch_ins_b(inst, distance_start); 408 } 409 410 #endif 411 412 static void kvm_map_magic_page(void *data) 413 { 414 u32 *features = data; 415 416 ulong in[8]; 417 ulong out[8]; 418 419 in[0] = KVM_MAGIC_PAGE; 420 in[1] = KVM_MAGIC_PAGE; 421 422 kvm_hypercall(in, out, KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE)); 423 424 *features = out[0]; 425 } 426 427 static void kvm_check_ins(u32 *inst, u32 features) 428 { 429 u32 _inst = *inst; 430 u32 inst_no_rt = _inst & ~KVM_MASK_RT; 431 u32 inst_rt = _inst & KVM_MASK_RT; 432 433 switch (inst_no_rt) { 434 /* Loads */ 435 case KVM_INST_MFMSR: 436 kvm_patch_ins_ld(inst, magic_var(msr), inst_rt); 437 break; 438 case KVM_INST_MFSPR(SPRN_SPRG0): 439 kvm_patch_ins_ld(inst, magic_var(sprg0), inst_rt); 440 break; 441 case KVM_INST_MFSPR(SPRN_SPRG1): 442 kvm_patch_ins_ld(inst, magic_var(sprg1), inst_rt); 443 break; 444 case KVM_INST_MFSPR(SPRN_SPRG2): 445 kvm_patch_ins_ld(inst, magic_var(sprg2), inst_rt); 446 break; 447 case KVM_INST_MFSPR(SPRN_SPRG3): 448 kvm_patch_ins_ld(inst, magic_var(sprg3), inst_rt); 449 break; 450 case KVM_INST_MFSPR(SPRN_SRR0): 451 kvm_patch_ins_ld(inst, magic_var(srr0), inst_rt); 452 break; 453 case KVM_INST_MFSPR(SPRN_SRR1): 454 kvm_patch_ins_ld(inst, magic_var(srr1), inst_rt); 455 break; 456 #ifdef CONFIG_BOOKE 457 case KVM_INST_MFSPR(SPRN_DEAR): 458 #else 459 case KVM_INST_MFSPR(SPRN_DAR): 460 #endif 461 kvm_patch_ins_ld(inst, magic_var(dar), inst_rt); 462 break; 463 case KVM_INST_MFSPR(SPRN_DSISR): 464 kvm_patch_ins_lwz(inst, magic_var(dsisr), inst_rt); 465 break; 466 467 #ifdef CONFIG_PPC_BOOK3E_MMU 468 case KVM_INST_MFSPR(SPRN_MAS0): 469 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 470 kvm_patch_ins_lwz(inst, magic_var(mas0), inst_rt); 471 break; 472 case KVM_INST_MFSPR(SPRN_MAS1): 473 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 474 kvm_patch_ins_lwz(inst, magic_var(mas1), inst_rt); 475 break; 476 case KVM_INST_MFSPR(SPRN_MAS2): 477 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 478 kvm_patch_ins_ld(inst, magic_var(mas2), inst_rt); 479 break; 480 case KVM_INST_MFSPR(SPRN_MAS3): 481 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 482 kvm_patch_ins_lwz(inst, magic_var(mas7_3) + 4, inst_rt); 483 break; 484 case KVM_INST_MFSPR(SPRN_MAS4): 485 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 486 kvm_patch_ins_lwz(inst, magic_var(mas4), inst_rt); 487 break; 488 case KVM_INST_MFSPR(SPRN_MAS6): 489 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 490 kvm_patch_ins_lwz(inst, magic_var(mas6), inst_rt); 491 break; 492 case KVM_INST_MFSPR(SPRN_MAS7): 493 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 494 kvm_patch_ins_lwz(inst, magic_var(mas7_3), inst_rt); 495 break; 496 #endif /* CONFIG_PPC_BOOK3E_MMU */ 497 498 case KVM_INST_MFSPR(SPRN_SPRG4): 499 #ifdef CONFIG_BOOKE 500 case KVM_INST_MFSPR(SPRN_SPRG4R): 501 #endif 502 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 503 kvm_patch_ins_ld(inst, magic_var(sprg4), inst_rt); 504 break; 505 case KVM_INST_MFSPR(SPRN_SPRG5): 506 #ifdef CONFIG_BOOKE 507 case KVM_INST_MFSPR(SPRN_SPRG5R): 508 #endif 509 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 510 kvm_patch_ins_ld(inst, magic_var(sprg5), inst_rt); 511 break; 512 case KVM_INST_MFSPR(SPRN_SPRG6): 513 #ifdef CONFIG_BOOKE 514 case KVM_INST_MFSPR(SPRN_SPRG6R): 515 #endif 516 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 517 kvm_patch_ins_ld(inst, magic_var(sprg6), inst_rt); 518 break; 519 case KVM_INST_MFSPR(SPRN_SPRG7): 520 #ifdef CONFIG_BOOKE 521 case KVM_INST_MFSPR(SPRN_SPRG7R): 522 #endif 523 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 524 kvm_patch_ins_ld(inst, magic_var(sprg7), inst_rt); 525 break; 526 527 #ifdef CONFIG_BOOKE 528 case KVM_INST_MFSPR(SPRN_ESR): 529 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 530 kvm_patch_ins_lwz(inst, magic_var(esr), inst_rt); 531 break; 532 #endif 533 534 case KVM_INST_MFSPR(SPRN_PIR): 535 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 536 kvm_patch_ins_lwz(inst, magic_var(pir), inst_rt); 537 break; 538 539 540 /* Stores */ 541 case KVM_INST_MTSPR(SPRN_SPRG0): 542 kvm_patch_ins_std(inst, magic_var(sprg0), inst_rt); 543 break; 544 case KVM_INST_MTSPR(SPRN_SPRG1): 545 kvm_patch_ins_std(inst, magic_var(sprg1), inst_rt); 546 break; 547 case KVM_INST_MTSPR(SPRN_SPRG2): 548 kvm_patch_ins_std(inst, magic_var(sprg2), inst_rt); 549 break; 550 case KVM_INST_MTSPR(SPRN_SPRG3): 551 kvm_patch_ins_std(inst, magic_var(sprg3), inst_rt); 552 break; 553 case KVM_INST_MTSPR(SPRN_SRR0): 554 kvm_patch_ins_std(inst, magic_var(srr0), inst_rt); 555 break; 556 case KVM_INST_MTSPR(SPRN_SRR1): 557 kvm_patch_ins_std(inst, magic_var(srr1), inst_rt); 558 break; 559 #ifdef CONFIG_BOOKE 560 case KVM_INST_MTSPR(SPRN_DEAR): 561 #else 562 case KVM_INST_MTSPR(SPRN_DAR): 563 #endif 564 kvm_patch_ins_std(inst, magic_var(dar), inst_rt); 565 break; 566 case KVM_INST_MTSPR(SPRN_DSISR): 567 kvm_patch_ins_stw(inst, magic_var(dsisr), inst_rt); 568 break; 569 #ifdef CONFIG_PPC_BOOK3E_MMU 570 case KVM_INST_MTSPR(SPRN_MAS0): 571 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 572 kvm_patch_ins_stw(inst, magic_var(mas0), inst_rt); 573 break; 574 case KVM_INST_MTSPR(SPRN_MAS1): 575 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 576 kvm_patch_ins_stw(inst, magic_var(mas1), inst_rt); 577 break; 578 case KVM_INST_MTSPR(SPRN_MAS2): 579 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 580 kvm_patch_ins_std(inst, magic_var(mas2), inst_rt); 581 break; 582 case KVM_INST_MTSPR(SPRN_MAS3): 583 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 584 kvm_patch_ins_stw(inst, magic_var(mas7_3) + 4, inst_rt); 585 break; 586 case KVM_INST_MTSPR(SPRN_MAS4): 587 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 588 kvm_patch_ins_stw(inst, magic_var(mas4), inst_rt); 589 break; 590 case KVM_INST_MTSPR(SPRN_MAS6): 591 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 592 kvm_patch_ins_stw(inst, magic_var(mas6), inst_rt); 593 break; 594 case KVM_INST_MTSPR(SPRN_MAS7): 595 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 596 kvm_patch_ins_stw(inst, magic_var(mas7_3), inst_rt); 597 break; 598 #endif /* CONFIG_PPC_BOOK3E_MMU */ 599 600 case KVM_INST_MTSPR(SPRN_SPRG4): 601 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 602 kvm_patch_ins_std(inst, magic_var(sprg4), inst_rt); 603 break; 604 case KVM_INST_MTSPR(SPRN_SPRG5): 605 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 606 kvm_patch_ins_std(inst, magic_var(sprg5), inst_rt); 607 break; 608 case KVM_INST_MTSPR(SPRN_SPRG6): 609 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 610 kvm_patch_ins_std(inst, magic_var(sprg6), inst_rt); 611 break; 612 case KVM_INST_MTSPR(SPRN_SPRG7): 613 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 614 kvm_patch_ins_std(inst, magic_var(sprg7), inst_rt); 615 break; 616 617 #ifdef CONFIG_BOOKE 618 case KVM_INST_MTSPR(SPRN_ESR): 619 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) 620 kvm_patch_ins_stw(inst, magic_var(esr), inst_rt); 621 break; 622 #endif 623 624 /* Nops */ 625 case KVM_INST_TLBSYNC: 626 kvm_patch_ins_nop(inst); 627 break; 628 629 /* Rewrites */ 630 case KVM_INST_MTMSRD_L1: 631 kvm_patch_ins_mtmsrd(inst, inst_rt); 632 break; 633 case KVM_INST_MTMSR: 634 case KVM_INST_MTMSRD_L0: 635 kvm_patch_ins_mtmsr(inst, inst_rt); 636 break; 637 #ifdef CONFIG_BOOKE 638 case KVM_INST_WRTEE: 639 kvm_patch_ins_wrtee(inst, inst_rt, 0); 640 break; 641 #endif 642 } 643 644 switch (inst_no_rt & ~KVM_MASK_RB) { 645 #ifdef CONFIG_PPC_BOOK3S_32 646 case KVM_INST_MTSRIN: 647 if (features & KVM_MAGIC_FEAT_SR) { 648 u32 inst_rb = _inst & KVM_MASK_RB; 649 kvm_patch_ins_mtsrin(inst, inst_rt, inst_rb); 650 } 651 break; 652 break; 653 #endif 654 } 655 656 switch (_inst) { 657 #ifdef CONFIG_BOOKE 658 case KVM_INST_WRTEEI_0: 659 kvm_patch_ins_wrteei_0(inst); 660 break; 661 662 case KVM_INST_WRTEEI_1: 663 kvm_patch_ins_wrtee(inst, 0, 1); 664 break; 665 #endif 666 } 667 } 668 669 extern u32 kvm_template_start[]; 670 extern u32 kvm_template_end[]; 671 672 static void kvm_use_magic_page(void) 673 { 674 u32 *p; 675 u32 *start, *end; 676 u32 tmp; 677 u32 features; 678 679 /* Tell the host to map the magic page to -4096 on all CPUs */ 680 on_each_cpu(kvm_map_magic_page, &features, 1); 681 682 /* Quick self-test to see if the mapping works */ 683 if (__get_user(tmp, (u32*)KVM_MAGIC_PAGE)) { 684 kvm_patching_worked = false; 685 return; 686 } 687 688 /* Now loop through all code and find instructions */ 689 start = (void*)_stext; 690 end = (void*)_etext; 691 692 /* 693 * Being interrupted in the middle of patching would 694 * be bad for SPRG4-7, which KVM can't keep in sync 695 * with emulated accesses because reads don't trap. 696 */ 697 local_irq_disable(); 698 699 for (p = start; p < end; p++) { 700 /* Avoid patching the template code */ 701 if (p >= kvm_template_start && p < kvm_template_end) { 702 p = kvm_template_end - 1; 703 continue; 704 } 705 kvm_check_ins(p, features); 706 } 707 708 local_irq_enable(); 709 710 printk(KERN_INFO "KVM: Live patching for a fast VM %s\n", 711 kvm_patching_worked ? "worked" : "failed"); 712 } 713 714 unsigned long kvm_hypercall(unsigned long *in, 715 unsigned long *out, 716 unsigned long nr) 717 { 718 unsigned long register r0 asm("r0"); 719 unsigned long register r3 asm("r3") = in[0]; 720 unsigned long register r4 asm("r4") = in[1]; 721 unsigned long register r5 asm("r5") = in[2]; 722 unsigned long register r6 asm("r6") = in[3]; 723 unsigned long register r7 asm("r7") = in[4]; 724 unsigned long register r8 asm("r8") = in[5]; 725 unsigned long register r9 asm("r9") = in[6]; 726 unsigned long register r10 asm("r10") = in[7]; 727 unsigned long register r11 asm("r11") = nr; 728 unsigned long register r12 asm("r12"); 729 730 asm volatile("bl epapr_hypercall_start" 731 : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6), 732 "=r"(r7), "=r"(r8), "=r"(r9), "=r"(r10), "=r"(r11), 733 "=r"(r12) 734 : "r"(r3), "r"(r4), "r"(r5), "r"(r6), "r"(r7), "r"(r8), 735 "r"(r9), "r"(r10), "r"(r11) 736 : "memory", "cc", "xer", "ctr", "lr"); 737 738 out[0] = r4; 739 out[1] = r5; 740 out[2] = r6; 741 out[3] = r7; 742 out[4] = r8; 743 out[5] = r9; 744 out[6] = r10; 745 out[7] = r11; 746 747 return r3; 748 } 749 EXPORT_SYMBOL_GPL(kvm_hypercall); 750 751 static __init void kvm_free_tmp(void) 752 { 753 free_reserved_area(&kvm_tmp[kvm_tmp_index], 754 &kvm_tmp[ARRAY_SIZE(kvm_tmp)], -1, NULL); 755 } 756 757 static int __init kvm_guest_init(void) 758 { 759 if (!kvm_para_available()) 760 goto free_tmp; 761 762 if (!epapr_paravirt_enabled) 763 goto free_tmp; 764 765 if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE)) 766 kvm_use_magic_page(); 767 768 #ifdef CONFIG_PPC_BOOK3S_64 769 /* Enable napping */ 770 powersave_nap = 1; 771 #endif 772 773 free_tmp: 774 kvm_free_tmp(); 775 776 return 0; 777 } 778 779 postcore_initcall(kvm_guest_init); 780