1 /* 2 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved. 3 * 4 * Authors: 5 * Alexander Graf <agraf@suse.de> 6 * Kevin Wolf <mail@kevin-wolf.de> 7 * 8 * Description: 9 * This file is derived from arch/powerpc/kvm/44x.c, 10 * by Hollis Blanchard <hollisb@us.ibm.com>. 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License, version 2, as 14 * published by the Free Software Foundation. 15 */ 16 17 #include <linux/kvm_host.h> 18 #include <linux/err.h> 19 20 #include <asm/reg.h> 21 #include <asm/cputable.h> 22 #include <asm/cacheflush.h> 23 #include <asm/tlbflush.h> 24 #include <asm/uaccess.h> 25 #include <asm/io.h> 26 #include <asm/kvm_ppc.h> 27 #include <asm/kvm_book3s.h> 28 #include <asm/mmu_context.h> 29 #include <linux/sched.h> 30 #include <linux/vmalloc.h> 31 32 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU 33 34 /* #define EXIT_DEBUG */ 35 /* #define EXIT_DEBUG_SIMPLE */ 36 37 /* Without AGGRESSIVE_DEC we only fire off a DEC interrupt when DEC turns 0. 38 * When set, we retrigger a DEC interrupt after that if DEC <= 0. 39 * PPC32 Linux runs faster without AGGRESSIVE_DEC, PPC64 Linux requires it. */ 40 41 /* #define AGGRESSIVE_DEC */ 42 43 struct kvm_stats_debugfs_item debugfs_entries[] = { 44 { "exits", VCPU_STAT(sum_exits) }, 45 { "mmio", VCPU_STAT(mmio_exits) }, 46 { "sig", VCPU_STAT(signal_exits) }, 47 { "sysc", VCPU_STAT(syscall_exits) }, 48 { "inst_emu", VCPU_STAT(emulated_inst_exits) }, 49 { "dec", VCPU_STAT(dec_exits) }, 50 { "ext_intr", VCPU_STAT(ext_intr_exits) }, 51 { "queue_intr", VCPU_STAT(queue_intr) }, 52 { "halt_wakeup", VCPU_STAT(halt_wakeup) }, 53 { "pf_storage", VCPU_STAT(pf_storage) }, 54 { "sp_storage", VCPU_STAT(sp_storage) }, 55 { "pf_instruc", VCPU_STAT(pf_instruc) }, 56 { "sp_instruc", VCPU_STAT(sp_instruc) }, 57 { "ld", VCPU_STAT(ld) }, 58 { "ld_slow", VCPU_STAT(ld_slow) }, 59 { "st", VCPU_STAT(st) }, 60 { "st_slow", VCPU_STAT(st_slow) }, 61 { NULL } 62 }; 63 64 void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu) 65 { 66 } 67 68 void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu) 69 { 70 } 71 72 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 73 { 74 memcpy(get_paca()->kvm_slb, to_book3s(vcpu)->slb_shadow, sizeof(get_paca()->kvm_slb)); 75 get_paca()->kvm_slb_max = to_book3s(vcpu)->slb_shadow_max; 76 } 77 78 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu) 79 { 80 memcpy(to_book3s(vcpu)->slb_shadow, get_paca()->kvm_slb, sizeof(get_paca()->kvm_slb)); 81 to_book3s(vcpu)->slb_shadow_max = get_paca()->kvm_slb_max; 82 } 83 84 #if defined(AGGRESSIVE_DEC) || defined(EXIT_DEBUG) 85 static u32 kvmppc_get_dec(struct kvm_vcpu *vcpu) 86 { 87 u64 jd = mftb() - vcpu->arch.dec_jiffies; 88 return vcpu->arch.dec - jd; 89 } 90 #endif 91 92 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr) 93 { 94 ulong old_msr = vcpu->arch.msr; 95 96 #ifdef EXIT_DEBUG 97 printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr); 98 #endif 99 msr &= to_book3s(vcpu)->msr_mask; 100 vcpu->arch.msr = msr; 101 vcpu->arch.shadow_msr = msr | MSR_USER32; 102 vcpu->arch.shadow_msr &= ( MSR_VEC | MSR_VSX | MSR_FP | MSR_FE0 | 103 MSR_USER64 | MSR_SE | MSR_BE | MSR_DE | 104 MSR_FE1); 105 106 if (msr & (MSR_WE|MSR_POW)) { 107 if (!vcpu->arch.pending_exceptions) { 108 kvm_vcpu_block(vcpu); 109 vcpu->stat.halt_wakeup++; 110 } 111 } 112 113 if (((vcpu->arch.msr & (MSR_IR|MSR_DR)) != (old_msr & (MSR_IR|MSR_DR))) || 114 (vcpu->arch.msr & MSR_PR) != (old_msr & MSR_PR)) { 115 kvmppc_mmu_flush_segments(vcpu); 116 kvmppc_mmu_map_segment(vcpu, vcpu->arch.pc); 117 } 118 } 119 120 void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags) 121 { 122 vcpu->arch.srr0 = vcpu->arch.pc; 123 vcpu->arch.srr1 = vcpu->arch.msr | flags; 124 vcpu->arch.pc = to_book3s(vcpu)->hior + vec; 125 vcpu->arch.mmu.reset_msr(vcpu); 126 } 127 128 void kvmppc_book3s_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int vec) 129 { 130 unsigned int prio; 131 132 vcpu->stat.queue_intr++; 133 switch (vec) { 134 case 0x100: prio = BOOK3S_IRQPRIO_SYSTEM_RESET; break; 135 case 0x200: prio = BOOK3S_IRQPRIO_MACHINE_CHECK; break; 136 case 0x300: prio = BOOK3S_IRQPRIO_DATA_STORAGE; break; 137 case 0x380: prio = BOOK3S_IRQPRIO_DATA_SEGMENT; break; 138 case 0x400: prio = BOOK3S_IRQPRIO_INST_STORAGE; break; 139 case 0x480: prio = BOOK3S_IRQPRIO_INST_SEGMENT; break; 140 case 0x500: prio = BOOK3S_IRQPRIO_EXTERNAL; break; 141 case 0x600: prio = BOOK3S_IRQPRIO_ALIGNMENT; break; 142 case 0x700: prio = BOOK3S_IRQPRIO_PROGRAM; break; 143 case 0x800: prio = BOOK3S_IRQPRIO_FP_UNAVAIL; break; 144 case 0x900: prio = BOOK3S_IRQPRIO_DECREMENTER; break; 145 case 0xc00: prio = BOOK3S_IRQPRIO_SYSCALL; break; 146 case 0xd00: prio = BOOK3S_IRQPRIO_DEBUG; break; 147 case 0xf20: prio = BOOK3S_IRQPRIO_ALTIVEC; break; 148 case 0xf40: prio = BOOK3S_IRQPRIO_VSX; break; 149 default: prio = BOOK3S_IRQPRIO_MAX; break; 150 } 151 152 set_bit(prio, &vcpu->arch.pending_exceptions); 153 #ifdef EXIT_DEBUG 154 printk(KERN_INFO "Queueing interrupt %x\n", vec); 155 #endif 156 } 157 158 159 void kvmppc_core_queue_program(struct kvm_vcpu *vcpu) 160 { 161 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_PROGRAM); 162 } 163 164 void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu) 165 { 166 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_DECREMENTER); 167 } 168 169 int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu) 170 { 171 return test_bit(BOOK3S_INTERRUPT_DECREMENTER >> 7, &vcpu->arch.pending_exceptions); 172 } 173 174 void kvmppc_core_queue_external(struct kvm_vcpu *vcpu, 175 struct kvm_interrupt *irq) 176 { 177 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL); 178 } 179 180 int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority) 181 { 182 int deliver = 1; 183 int vec = 0; 184 185 switch (priority) { 186 case BOOK3S_IRQPRIO_DECREMENTER: 187 deliver = vcpu->arch.msr & MSR_EE; 188 vec = BOOK3S_INTERRUPT_DECREMENTER; 189 break; 190 case BOOK3S_IRQPRIO_EXTERNAL: 191 deliver = vcpu->arch.msr & MSR_EE; 192 vec = BOOK3S_INTERRUPT_EXTERNAL; 193 break; 194 case BOOK3S_IRQPRIO_SYSTEM_RESET: 195 vec = BOOK3S_INTERRUPT_SYSTEM_RESET; 196 break; 197 case BOOK3S_IRQPRIO_MACHINE_CHECK: 198 vec = BOOK3S_INTERRUPT_MACHINE_CHECK; 199 break; 200 case BOOK3S_IRQPRIO_DATA_STORAGE: 201 vec = BOOK3S_INTERRUPT_DATA_STORAGE; 202 break; 203 case BOOK3S_IRQPRIO_INST_STORAGE: 204 vec = BOOK3S_INTERRUPT_INST_STORAGE; 205 break; 206 case BOOK3S_IRQPRIO_DATA_SEGMENT: 207 vec = BOOK3S_INTERRUPT_DATA_SEGMENT; 208 break; 209 case BOOK3S_IRQPRIO_INST_SEGMENT: 210 vec = BOOK3S_INTERRUPT_INST_SEGMENT; 211 break; 212 case BOOK3S_IRQPRIO_ALIGNMENT: 213 vec = BOOK3S_INTERRUPT_ALIGNMENT; 214 break; 215 case BOOK3S_IRQPRIO_PROGRAM: 216 vec = BOOK3S_INTERRUPT_PROGRAM; 217 break; 218 case BOOK3S_IRQPRIO_VSX: 219 vec = BOOK3S_INTERRUPT_VSX; 220 break; 221 case BOOK3S_IRQPRIO_ALTIVEC: 222 vec = BOOK3S_INTERRUPT_ALTIVEC; 223 break; 224 case BOOK3S_IRQPRIO_FP_UNAVAIL: 225 vec = BOOK3S_INTERRUPT_FP_UNAVAIL; 226 break; 227 case BOOK3S_IRQPRIO_SYSCALL: 228 vec = BOOK3S_INTERRUPT_SYSCALL; 229 break; 230 case BOOK3S_IRQPRIO_DEBUG: 231 vec = BOOK3S_INTERRUPT_TRACE; 232 break; 233 case BOOK3S_IRQPRIO_PERFORMANCE_MONITOR: 234 vec = BOOK3S_INTERRUPT_PERFMON; 235 break; 236 default: 237 deliver = 0; 238 printk(KERN_ERR "KVM: Unknown interrupt: 0x%x\n", priority); 239 break; 240 } 241 242 #if 0 243 printk(KERN_INFO "Deliver interrupt 0x%x? %x\n", vec, deliver); 244 #endif 245 246 if (deliver) 247 kvmppc_inject_interrupt(vcpu, vec, 0ULL); 248 249 return deliver; 250 } 251 252 void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu) 253 { 254 unsigned long *pending = &vcpu->arch.pending_exceptions; 255 unsigned int priority; 256 257 /* XXX be more clever here - no need to mftb() on every entry */ 258 /* Issue DEC again if it's still active */ 259 #ifdef AGGRESSIVE_DEC 260 if (vcpu->arch.msr & MSR_EE) 261 if (kvmppc_get_dec(vcpu) & 0x80000000) 262 kvmppc_core_queue_dec(vcpu); 263 #endif 264 265 #ifdef EXIT_DEBUG 266 if (vcpu->arch.pending_exceptions) 267 printk(KERN_EMERG "KVM: Check pending: %lx\n", vcpu->arch.pending_exceptions); 268 #endif 269 priority = __ffs(*pending); 270 while (priority <= (sizeof(unsigned int) * 8)) { 271 if (kvmppc_book3s_irqprio_deliver(vcpu, priority)) { 272 clear_bit(priority, &vcpu->arch.pending_exceptions); 273 break; 274 } 275 276 priority = find_next_bit(pending, 277 BITS_PER_BYTE * sizeof(*pending), 278 priority + 1); 279 } 280 } 281 282 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr) 283 { 284 vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB; 285 vcpu->arch.pvr = pvr; 286 if ((pvr >= 0x330000) && (pvr < 0x70330000)) { 287 kvmppc_mmu_book3s_64_init(vcpu); 288 to_book3s(vcpu)->hior = 0xfff00000; 289 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL; 290 } else { 291 kvmppc_mmu_book3s_32_init(vcpu); 292 to_book3s(vcpu)->hior = 0; 293 to_book3s(vcpu)->msr_mask = 0xffffffffULL; 294 } 295 296 /* If we are in hypervisor level on 970, we can tell the CPU to 297 * treat DCBZ as 32 bytes store */ 298 vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32; 299 if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) && 300 !strcmp(cur_cpu_spec->platform, "ppc970")) 301 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32; 302 303 } 304 305 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To 306 * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to 307 * emulate 32 bytes dcbz length. 308 * 309 * The Book3s_64 inventors also realized this case and implemented a special bit 310 * in the HID5 register, which is a hypervisor ressource. Thus we can't use it. 311 * 312 * My approach here is to patch the dcbz instruction on executing pages. 313 */ 314 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte) 315 { 316 bool touched = false; 317 hva_t hpage; 318 u32 *page; 319 int i; 320 321 hpage = gfn_to_hva(vcpu->kvm, pte->raddr >> PAGE_SHIFT); 322 if (kvm_is_error_hva(hpage)) 323 return; 324 325 hpage |= pte->raddr & ~PAGE_MASK; 326 hpage &= ~0xFFFULL; 327 328 page = vmalloc(HW_PAGE_SIZE); 329 330 if (copy_from_user(page, (void __user *)hpage, HW_PAGE_SIZE)) 331 goto out; 332 333 for (i=0; i < HW_PAGE_SIZE / 4; i++) 334 if ((page[i] & 0xff0007ff) == INS_DCBZ) { 335 page[i] &= 0xfffffff7; // reserved instruction, so we trap 336 touched = true; 337 } 338 339 if (touched) 340 copy_to_user((void __user *)hpage, page, HW_PAGE_SIZE); 341 342 out: 343 vfree(page); 344 } 345 346 static int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr, bool data, 347 struct kvmppc_pte *pte) 348 { 349 int relocated = (vcpu->arch.msr & (data ? MSR_DR : MSR_IR)); 350 int r; 351 352 if (relocated) { 353 r = vcpu->arch.mmu.xlate(vcpu, eaddr, pte, data); 354 } else { 355 pte->eaddr = eaddr; 356 pte->raddr = eaddr & 0xffffffff; 357 pte->vpage = eaddr >> 12; 358 switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) { 359 case 0: 360 pte->vpage |= VSID_REAL; 361 case MSR_DR: 362 pte->vpage |= VSID_REAL_DR; 363 case MSR_IR: 364 pte->vpage |= VSID_REAL_IR; 365 } 366 pte->may_read = true; 367 pte->may_write = true; 368 pte->may_execute = true; 369 r = 0; 370 } 371 372 return r; 373 } 374 375 static hva_t kvmppc_bad_hva(void) 376 { 377 return PAGE_OFFSET; 378 } 379 380 static hva_t kvmppc_pte_to_hva(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte, 381 bool read) 382 { 383 hva_t hpage; 384 385 if (read && !pte->may_read) 386 goto err; 387 388 if (!read && !pte->may_write) 389 goto err; 390 391 hpage = gfn_to_hva(vcpu->kvm, pte->raddr >> PAGE_SHIFT); 392 if (kvm_is_error_hva(hpage)) 393 goto err; 394 395 return hpage | (pte->raddr & ~PAGE_MASK); 396 err: 397 return kvmppc_bad_hva(); 398 } 399 400 int kvmppc_st(struct kvm_vcpu *vcpu, ulong eaddr, int size, void *ptr) 401 { 402 struct kvmppc_pte pte; 403 hva_t hva = eaddr; 404 405 vcpu->stat.st++; 406 407 if (kvmppc_xlate(vcpu, eaddr, false, &pte)) 408 goto err; 409 410 hva = kvmppc_pte_to_hva(vcpu, &pte, false); 411 if (kvm_is_error_hva(hva)) 412 goto err; 413 414 if (copy_to_user((void __user *)hva, ptr, size)) { 415 printk(KERN_INFO "kvmppc_st at 0x%lx failed\n", hva); 416 goto err; 417 } 418 419 return 0; 420 421 err: 422 return -ENOENT; 423 } 424 425 int kvmppc_ld(struct kvm_vcpu *vcpu, ulong eaddr, int size, void *ptr, 426 bool data) 427 { 428 struct kvmppc_pte pte; 429 hva_t hva = eaddr; 430 431 vcpu->stat.ld++; 432 433 if (kvmppc_xlate(vcpu, eaddr, data, &pte)) 434 goto err; 435 436 hva = kvmppc_pte_to_hva(vcpu, &pte, true); 437 if (kvm_is_error_hva(hva)) 438 goto err; 439 440 if (copy_from_user(ptr, (void __user *)hva, size)) { 441 printk(KERN_INFO "kvmppc_ld at 0x%lx failed\n", hva); 442 goto err; 443 } 444 445 return 0; 446 447 err: 448 return -ENOENT; 449 } 450 451 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) 452 { 453 return kvm_is_visible_gfn(vcpu->kvm, gfn); 454 } 455 456 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu, 457 ulong eaddr, int vec) 458 { 459 bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE); 460 int r = RESUME_GUEST; 461 int relocated; 462 int page_found = 0; 463 struct kvmppc_pte pte; 464 bool is_mmio = false; 465 466 if ( vec == BOOK3S_INTERRUPT_DATA_STORAGE ) { 467 relocated = (vcpu->arch.msr & MSR_DR); 468 } else { 469 relocated = (vcpu->arch.msr & MSR_IR); 470 } 471 472 /* Resolve real address if translation turned on */ 473 if (relocated) { 474 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data); 475 } else { 476 pte.may_execute = true; 477 pte.may_read = true; 478 pte.may_write = true; 479 pte.raddr = eaddr & 0xffffffff; 480 pte.eaddr = eaddr; 481 pte.vpage = eaddr >> 12; 482 switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) { 483 case 0: 484 pte.vpage |= VSID_REAL; 485 case MSR_DR: 486 pte.vpage |= VSID_REAL_DR; 487 case MSR_IR: 488 pte.vpage |= VSID_REAL_IR; 489 } 490 } 491 492 if (vcpu->arch.mmu.is_dcbz32(vcpu) && 493 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) { 494 /* 495 * If we do the dcbz hack, we have to NX on every execution, 496 * so we can patch the executing code. This renders our guest 497 * NX-less. 498 */ 499 pte.may_execute = !data; 500 } 501 502 if (page_found == -ENOENT) { 503 /* Page not found in guest PTE entries */ 504 vcpu->arch.dear = vcpu->arch.fault_dear; 505 to_book3s(vcpu)->dsisr = vcpu->arch.fault_dsisr; 506 vcpu->arch.msr |= (vcpu->arch.shadow_msr & 0x00000000f8000000ULL); 507 kvmppc_book3s_queue_irqprio(vcpu, vec); 508 } else if (page_found == -EPERM) { 509 /* Storage protection */ 510 vcpu->arch.dear = vcpu->arch.fault_dear; 511 to_book3s(vcpu)->dsisr = vcpu->arch.fault_dsisr & ~DSISR_NOHPTE; 512 to_book3s(vcpu)->dsisr |= DSISR_PROTFAULT; 513 vcpu->arch.msr |= (vcpu->arch.shadow_msr & 0x00000000f8000000ULL); 514 kvmppc_book3s_queue_irqprio(vcpu, vec); 515 } else if (page_found == -EINVAL) { 516 /* Page not found in guest SLB */ 517 vcpu->arch.dear = vcpu->arch.fault_dear; 518 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80); 519 } else if (!is_mmio && 520 kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) { 521 /* The guest's PTE is not mapped yet. Map on the host */ 522 kvmppc_mmu_map_page(vcpu, &pte); 523 if (data) 524 vcpu->stat.sp_storage++; 525 else if (vcpu->arch.mmu.is_dcbz32(vcpu) && 526 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) 527 kvmppc_patch_dcbz(vcpu, &pte); 528 } else { 529 /* MMIO */ 530 vcpu->stat.mmio_exits++; 531 vcpu->arch.paddr_accessed = pte.raddr; 532 r = kvmppc_emulate_mmio(run, vcpu); 533 if ( r == RESUME_HOST_NV ) 534 r = RESUME_HOST; 535 if ( r == RESUME_GUEST_NV ) 536 r = RESUME_GUEST; 537 } 538 539 return r; 540 } 541 542 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, 543 unsigned int exit_nr) 544 { 545 int r = RESUME_HOST; 546 547 vcpu->stat.sum_exits++; 548 549 run->exit_reason = KVM_EXIT_UNKNOWN; 550 run->ready_for_interrupt_injection = 1; 551 #ifdef EXIT_DEBUG 552 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | dar=0x%lx | dec=0x%x | msr=0x%lx\n", 553 exit_nr, vcpu->arch.pc, vcpu->arch.fault_dear, 554 kvmppc_get_dec(vcpu), vcpu->arch.msr); 555 #elif defined (EXIT_DEBUG_SIMPLE) 556 if ((exit_nr != 0x900) && (exit_nr != 0x500)) 557 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | dar=0x%lx | msr=0x%lx\n", 558 exit_nr, vcpu->arch.pc, vcpu->arch.fault_dear, 559 vcpu->arch.msr); 560 #endif 561 kvm_resched(vcpu); 562 switch (exit_nr) { 563 case BOOK3S_INTERRUPT_INST_STORAGE: 564 vcpu->stat.pf_instruc++; 565 /* only care about PTEG not found errors, but leave NX alone */ 566 if (vcpu->arch.shadow_msr & 0x40000000) { 567 r = kvmppc_handle_pagefault(run, vcpu, vcpu->arch.pc, exit_nr); 568 vcpu->stat.sp_instruc++; 569 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) && 570 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) { 571 /* 572 * XXX If we do the dcbz hack we use the NX bit to flush&patch the page, 573 * so we can't use the NX bit inside the guest. Let's cross our fingers, 574 * that no guest that needs the dcbz hack does NX. 575 */ 576 kvmppc_mmu_pte_flush(vcpu, vcpu->arch.pc, ~0xFFFULL); 577 } else { 578 vcpu->arch.msr |= (vcpu->arch.shadow_msr & 0x58000000); 579 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 580 kvmppc_mmu_pte_flush(vcpu, vcpu->arch.pc, ~0xFFFULL); 581 r = RESUME_GUEST; 582 } 583 break; 584 case BOOK3S_INTERRUPT_DATA_STORAGE: 585 vcpu->stat.pf_storage++; 586 /* The only case we need to handle is missing shadow PTEs */ 587 if (vcpu->arch.fault_dsisr & DSISR_NOHPTE) { 588 r = kvmppc_handle_pagefault(run, vcpu, vcpu->arch.fault_dear, exit_nr); 589 } else { 590 vcpu->arch.dear = vcpu->arch.fault_dear; 591 to_book3s(vcpu)->dsisr = vcpu->arch.fault_dsisr; 592 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 593 kvmppc_mmu_pte_flush(vcpu, vcpu->arch.dear, ~0xFFFULL); 594 r = RESUME_GUEST; 595 } 596 break; 597 case BOOK3S_INTERRUPT_DATA_SEGMENT: 598 if (kvmppc_mmu_map_segment(vcpu, vcpu->arch.fault_dear) < 0) { 599 vcpu->arch.dear = vcpu->arch.fault_dear; 600 kvmppc_book3s_queue_irqprio(vcpu, 601 BOOK3S_INTERRUPT_DATA_SEGMENT); 602 } 603 r = RESUME_GUEST; 604 break; 605 case BOOK3S_INTERRUPT_INST_SEGMENT: 606 if (kvmppc_mmu_map_segment(vcpu, vcpu->arch.pc) < 0) { 607 kvmppc_book3s_queue_irqprio(vcpu, 608 BOOK3S_INTERRUPT_INST_SEGMENT); 609 } 610 r = RESUME_GUEST; 611 break; 612 /* We're good on these - the host merely wanted to get our attention */ 613 case BOOK3S_INTERRUPT_DECREMENTER: 614 vcpu->stat.dec_exits++; 615 r = RESUME_GUEST; 616 break; 617 case BOOK3S_INTERRUPT_EXTERNAL: 618 vcpu->stat.ext_intr_exits++; 619 r = RESUME_GUEST; 620 break; 621 case BOOK3S_INTERRUPT_PROGRAM: 622 { 623 enum emulation_result er; 624 625 if (vcpu->arch.msr & MSR_PR) { 626 #ifdef EXIT_DEBUG 627 printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", vcpu->arch.pc, vcpu->arch.last_inst); 628 #endif 629 if ((vcpu->arch.last_inst & 0xff0007ff) != 630 (INS_DCBZ & 0xfffffff7)) { 631 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 632 r = RESUME_GUEST; 633 break; 634 } 635 } 636 637 vcpu->stat.emulated_inst_exits++; 638 er = kvmppc_emulate_instruction(run, vcpu); 639 switch (er) { 640 case EMULATE_DONE: 641 r = RESUME_GUEST; 642 break; 643 case EMULATE_FAIL: 644 printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n", 645 __func__, vcpu->arch.pc, vcpu->arch.last_inst); 646 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 647 r = RESUME_GUEST; 648 break; 649 default: 650 BUG(); 651 } 652 break; 653 } 654 case BOOK3S_INTERRUPT_SYSCALL: 655 #ifdef EXIT_DEBUG 656 printk(KERN_INFO "Syscall Nr %d\n", (int)vcpu->arch.gpr[0]); 657 #endif 658 vcpu->stat.syscall_exits++; 659 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 660 r = RESUME_GUEST; 661 break; 662 case BOOK3S_INTERRUPT_MACHINE_CHECK: 663 case BOOK3S_INTERRUPT_FP_UNAVAIL: 664 case BOOK3S_INTERRUPT_TRACE: 665 case BOOK3S_INTERRUPT_ALTIVEC: 666 case BOOK3S_INTERRUPT_VSX: 667 kvmppc_book3s_queue_irqprio(vcpu, exit_nr); 668 r = RESUME_GUEST; 669 break; 670 default: 671 /* Ugh - bork here! What did we get? */ 672 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n", exit_nr, vcpu->arch.pc, vcpu->arch.shadow_msr); 673 r = RESUME_HOST; 674 BUG(); 675 break; 676 } 677 678 679 if (!(r & RESUME_HOST)) { 680 /* To avoid clobbering exit_reason, only check for signals if 681 * we aren't already exiting to userspace for some other 682 * reason. */ 683 if (signal_pending(current)) { 684 #ifdef EXIT_DEBUG 685 printk(KERN_EMERG "KVM: Going back to host\n"); 686 #endif 687 vcpu->stat.signal_exits++; 688 run->exit_reason = KVM_EXIT_INTR; 689 r = -EINTR; 690 } else { 691 /* In case an interrupt came in that was triggered 692 * from userspace (like DEC), we need to check what 693 * to inject now! */ 694 kvmppc_core_deliver_interrupts(vcpu); 695 } 696 } 697 698 #ifdef EXIT_DEBUG 699 printk(KERN_EMERG "KVM exit: vcpu=0x%p pc=0x%lx r=0x%x\n", vcpu, vcpu->arch.pc, r); 700 #endif 701 702 return r; 703 } 704 705 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) 706 { 707 return 0; 708 } 709 710 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 711 { 712 int i; 713 714 regs->pc = vcpu->arch.pc; 715 regs->cr = vcpu->arch.cr; 716 regs->ctr = vcpu->arch.ctr; 717 regs->lr = vcpu->arch.lr; 718 regs->xer = vcpu->arch.xer; 719 regs->msr = vcpu->arch.msr; 720 regs->srr0 = vcpu->arch.srr0; 721 regs->srr1 = vcpu->arch.srr1; 722 regs->pid = vcpu->arch.pid; 723 regs->sprg0 = vcpu->arch.sprg0; 724 regs->sprg1 = vcpu->arch.sprg1; 725 regs->sprg2 = vcpu->arch.sprg2; 726 regs->sprg3 = vcpu->arch.sprg3; 727 regs->sprg5 = vcpu->arch.sprg4; 728 regs->sprg6 = vcpu->arch.sprg5; 729 regs->sprg7 = vcpu->arch.sprg6; 730 731 for (i = 0; i < ARRAY_SIZE(regs->gpr); i++) 732 regs->gpr[i] = vcpu->arch.gpr[i]; 733 734 return 0; 735 } 736 737 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 738 { 739 int i; 740 741 vcpu->arch.pc = regs->pc; 742 vcpu->arch.cr = regs->cr; 743 vcpu->arch.ctr = regs->ctr; 744 vcpu->arch.lr = regs->lr; 745 vcpu->arch.xer = regs->xer; 746 kvmppc_set_msr(vcpu, regs->msr); 747 vcpu->arch.srr0 = regs->srr0; 748 vcpu->arch.srr1 = regs->srr1; 749 vcpu->arch.sprg0 = regs->sprg0; 750 vcpu->arch.sprg1 = regs->sprg1; 751 vcpu->arch.sprg2 = regs->sprg2; 752 vcpu->arch.sprg3 = regs->sprg3; 753 vcpu->arch.sprg5 = regs->sprg4; 754 vcpu->arch.sprg6 = regs->sprg5; 755 vcpu->arch.sprg7 = regs->sprg6; 756 757 for (i = 0; i < ARRAY_SIZE(vcpu->arch.gpr); i++) 758 vcpu->arch.gpr[i] = regs->gpr[i]; 759 760 return 0; 761 } 762 763 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 764 struct kvm_sregs *sregs) 765 { 766 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu); 767 int i; 768 769 sregs->pvr = vcpu->arch.pvr; 770 771 sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1; 772 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) { 773 for (i = 0; i < 64; i++) { 774 sregs->u.s.ppc64.slb[i].slbe = vcpu3s->slb[i].orige | i; 775 sregs->u.s.ppc64.slb[i].slbv = vcpu3s->slb[i].origv; 776 } 777 } else { 778 for (i = 0; i < 16; i++) { 779 sregs->u.s.ppc32.sr[i] = vcpu3s->sr[i].raw; 780 sregs->u.s.ppc32.sr[i] = vcpu3s->sr[i].raw; 781 } 782 for (i = 0; i < 8; i++) { 783 sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw; 784 sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw; 785 } 786 } 787 return 0; 788 } 789 790 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 791 struct kvm_sregs *sregs) 792 { 793 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu); 794 int i; 795 796 kvmppc_set_pvr(vcpu, sregs->pvr); 797 798 vcpu3s->sdr1 = sregs->u.s.sdr1; 799 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) { 800 for (i = 0; i < 64; i++) { 801 vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv, 802 sregs->u.s.ppc64.slb[i].slbe); 803 } 804 } else { 805 for (i = 0; i < 16; i++) { 806 vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]); 807 } 808 for (i = 0; i < 8; i++) { 809 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false, 810 (u32)sregs->u.s.ppc32.ibat[i]); 811 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true, 812 (u32)(sregs->u.s.ppc32.ibat[i] >> 32)); 813 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false, 814 (u32)sregs->u.s.ppc32.dbat[i]); 815 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true, 816 (u32)(sregs->u.s.ppc32.dbat[i] >> 32)); 817 } 818 } 819 820 /* Flush the MMU after messing with the segments */ 821 kvmppc_mmu_pte_flush(vcpu, 0, 0); 822 return 0; 823 } 824 825 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 826 { 827 return -ENOTSUPP; 828 } 829 830 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 831 { 832 return -ENOTSUPP; 833 } 834 835 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 836 struct kvm_translation *tr) 837 { 838 return 0; 839 } 840 841 /* 842 * Get (and clear) the dirty memory log for a memory slot. 843 */ 844 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, 845 struct kvm_dirty_log *log) 846 { 847 struct kvm_memory_slot *memslot; 848 struct kvm_vcpu *vcpu; 849 ulong ga, ga_end; 850 int is_dirty = 0; 851 int r, n; 852 853 down_write(&kvm->slots_lock); 854 855 r = kvm_get_dirty_log(kvm, log, &is_dirty); 856 if (r) 857 goto out; 858 859 /* If nothing is dirty, don't bother messing with page tables. */ 860 if (is_dirty) { 861 memslot = &kvm->memslots[log->slot]; 862 863 ga = memslot->base_gfn << PAGE_SHIFT; 864 ga_end = ga + (memslot->npages << PAGE_SHIFT); 865 866 kvm_for_each_vcpu(n, vcpu, kvm) 867 kvmppc_mmu_pte_pflush(vcpu, ga, ga_end); 868 869 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; 870 memset(memslot->dirty_bitmap, 0, n); 871 } 872 873 r = 0; 874 out: 875 up_write(&kvm->slots_lock); 876 return r; 877 } 878 879 int kvmppc_core_check_processor_compat(void) 880 { 881 return 0; 882 } 883 884 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) 885 { 886 struct kvmppc_vcpu_book3s *vcpu_book3s; 887 struct kvm_vcpu *vcpu; 888 int err; 889 890 vcpu_book3s = (struct kvmppc_vcpu_book3s *)__get_free_pages( GFP_KERNEL | __GFP_ZERO, 891 get_order(sizeof(struct kvmppc_vcpu_book3s))); 892 if (!vcpu_book3s) { 893 err = -ENOMEM; 894 goto out; 895 } 896 897 vcpu = &vcpu_book3s->vcpu; 898 err = kvm_vcpu_init(vcpu, kvm, id); 899 if (err) 900 goto free_vcpu; 901 902 vcpu->arch.host_retip = kvm_return_point; 903 vcpu->arch.host_msr = mfmsr(); 904 /* default to book3s_64 (970fx) */ 905 vcpu->arch.pvr = 0x3C0301; 906 kvmppc_set_pvr(vcpu, vcpu->arch.pvr); 907 vcpu_book3s->slb_nr = 64; 908 909 /* remember where some real-mode handlers are */ 910 vcpu->arch.trampoline_lowmem = kvmppc_trampoline_lowmem; 911 vcpu->arch.trampoline_enter = kvmppc_trampoline_enter; 912 vcpu->arch.highmem_handler = (ulong)kvmppc_handler_highmem; 913 914 vcpu->arch.shadow_msr = MSR_USER64; 915 916 err = __init_new_context(); 917 if (err < 0) 918 goto free_vcpu; 919 vcpu_book3s->context_id = err; 920 921 vcpu_book3s->vsid_max = ((vcpu_book3s->context_id + 1) << USER_ESID_BITS) - 1; 922 vcpu_book3s->vsid_first = vcpu_book3s->context_id << USER_ESID_BITS; 923 vcpu_book3s->vsid_next = vcpu_book3s->vsid_first; 924 925 return vcpu; 926 927 free_vcpu: 928 free_pages((long)vcpu_book3s, get_order(sizeof(struct kvmppc_vcpu_book3s))); 929 out: 930 return ERR_PTR(err); 931 } 932 933 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu) 934 { 935 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); 936 937 __destroy_context(vcpu_book3s->context_id); 938 kvm_vcpu_uninit(vcpu); 939 free_pages((long)vcpu_book3s, get_order(sizeof(struct kvmppc_vcpu_book3s))); 940 } 941 942 extern int __kvmppc_vcpu_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu); 943 int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) 944 { 945 int ret; 946 947 /* No need to go into the guest when all we do is going out */ 948 if (signal_pending(current)) { 949 kvm_run->exit_reason = KVM_EXIT_INTR; 950 return -EINTR; 951 } 952 953 /* XXX we get called with irq disabled - change that! */ 954 local_irq_enable(); 955 956 ret = __kvmppc_vcpu_entry(kvm_run, vcpu); 957 958 local_irq_disable(); 959 960 return ret; 961 } 962 963 static int kvmppc_book3s_init(void) 964 { 965 return kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), THIS_MODULE); 966 } 967 968 static void kvmppc_book3s_exit(void) 969 { 970 kvm_exit(); 971 } 972 973 module_init(kvmppc_book3s_init); 974 module_exit(kvmppc_book3s_exit); 975