1/* 2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University 3 * Author: Christoffer Dall <c.dall@virtualopensystems.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License, version 2, as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 17 */ 18 19#include <linux/cpu.h> 20#include <linux/cpu_pm.h> 21#include <linux/errno.h> 22#include <linux/err.h> 23#include <linux/kvm_host.h> 24#include <linux/module.h> 25#include <linux/vmalloc.h> 26#include <linux/fs.h> 27#include <linux/mman.h> 28#include <linux/sched.h> 29#include <linux/kvm.h> 30#include <trace/events/kvm.h> 31 32#define CREATE_TRACE_POINTS 33#include "trace.h" 34 35#include <asm/uaccess.h> 36#include <asm/ptrace.h> 37#include <asm/mman.h> 38#include <asm/tlbflush.h> 39#include <asm/cacheflush.h> 40#include <asm/virt.h> 41#include <asm/kvm_arm.h> 42#include <asm/kvm_asm.h> 43#include <asm/kvm_mmu.h> 44#include <asm/kvm_emulate.h> 45#include <asm/kvm_coproc.h> 46#include <asm/kvm_psci.h> 47 48#ifdef REQUIRES_VIRT 49__asm__(".arch_extension virt"); 50#endif 51 52static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); 53static kvm_cpu_context_t __percpu *kvm_host_cpu_state; 54static unsigned long hyp_default_vectors; 55 56/* Per-CPU variable containing the currently running vcpu. */ 57static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu); 58 59/* The VMID used in the VTTBR */ 60static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); 61static u8 kvm_next_vmid; 62static DEFINE_SPINLOCK(kvm_vmid_lock); 63 64static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu) 65{ 66 BUG_ON(preemptible()); 67 __this_cpu_write(kvm_arm_running_vcpu, vcpu); 68} 69 70/** 71 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU. 72 * Must be called from non-preemptible context 73 */ 74struct kvm_vcpu *kvm_arm_get_running_vcpu(void) 75{ 76 BUG_ON(preemptible()); 77 return __this_cpu_read(kvm_arm_running_vcpu); 78} 79 80/** 81 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus. 82 */ 83struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void) 84{ 85 return &kvm_arm_running_vcpu; 86} 87 88int kvm_arch_hardware_enable(void) 89{ 90 return 0; 91} 92 93int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 94{ 95 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; 96} 97 98int kvm_arch_hardware_setup(void) 99{ 100 return 0; 101} 102 103void kvm_arch_check_processor_compat(void *rtn) 104{ 105 *(int *)rtn = 0; 106} 107 108 109/** 110 * kvm_arch_init_vm - initializes a VM data structure 111 * @kvm: pointer to the KVM struct 112 */ 113int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 114{ 115 int ret = 0; 116 117 if (type) 118 return -EINVAL; 119 120 ret = kvm_alloc_stage2_pgd(kvm); 121 if (ret) 122 goto out_fail_alloc; 123 124 ret = create_hyp_mappings(kvm, kvm + 1); 125 if (ret) 126 goto out_free_stage2_pgd; 127 128 kvm_timer_init(kvm); 129 130 /* Mark the initial VMID generation invalid */ 131 kvm->arch.vmid_gen = 0; 132 133 /* The maximum number of VCPUs is limited by the host's GIC model */ 134 kvm->arch.max_vcpus = kvm_vgic_get_max_vcpus(); 135 136 return ret; 137out_free_stage2_pgd: 138 kvm_free_stage2_pgd(kvm); 139out_fail_alloc: 140 return ret; 141} 142 143int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 144{ 145 return VM_FAULT_SIGBUS; 146} 147 148 149/** 150 * kvm_arch_destroy_vm - destroy the VM data structure 151 * @kvm: pointer to the KVM struct 152 */ 153void kvm_arch_destroy_vm(struct kvm *kvm) 154{ 155 int i; 156 157 kvm_free_stage2_pgd(kvm); 158 159 for (i = 0; i < KVM_MAX_VCPUS; ++i) { 160 if (kvm->vcpus[i]) { 161 kvm_arch_vcpu_free(kvm->vcpus[i]); 162 kvm->vcpus[i] = NULL; 163 } 164 } 165 166 kvm_vgic_destroy(kvm); 167} 168 169int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 170{ 171 int r; 172 switch (ext) { 173 case KVM_CAP_IRQCHIP: 174 case KVM_CAP_IRQFD: 175 case KVM_CAP_IOEVENTFD: 176 case KVM_CAP_DEVICE_CTRL: 177 case KVM_CAP_USER_MEMORY: 178 case KVM_CAP_SYNC_MMU: 179 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: 180 case KVM_CAP_ONE_REG: 181 case KVM_CAP_ARM_PSCI: 182 case KVM_CAP_ARM_PSCI_0_2: 183 case KVM_CAP_READONLY_MEM: 184 case KVM_CAP_MP_STATE: 185 r = 1; 186 break; 187 case KVM_CAP_COALESCED_MMIO: 188 r = KVM_COALESCED_MMIO_PAGE_OFFSET; 189 break; 190 case KVM_CAP_ARM_SET_DEVICE_ADDR: 191 r = 1; 192 break; 193 case KVM_CAP_NR_VCPUS: 194 r = num_online_cpus(); 195 break; 196 case KVM_CAP_MAX_VCPUS: 197 r = KVM_MAX_VCPUS; 198 break; 199 default: 200 r = kvm_arch_dev_ioctl_check_extension(ext); 201 break; 202 } 203 return r; 204} 205 206long kvm_arch_dev_ioctl(struct file *filp, 207 unsigned int ioctl, unsigned long arg) 208{ 209 return -EINVAL; 210} 211 212 213struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) 214{ 215 int err; 216 struct kvm_vcpu *vcpu; 217 218 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) { 219 err = -EBUSY; 220 goto out; 221 } 222 223 if (id >= kvm->arch.max_vcpus) { 224 err = -EINVAL; 225 goto out; 226 } 227 228 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); 229 if (!vcpu) { 230 err = -ENOMEM; 231 goto out; 232 } 233 234 err = kvm_vcpu_init(vcpu, kvm, id); 235 if (err) 236 goto free_vcpu; 237 238 err = create_hyp_mappings(vcpu, vcpu + 1); 239 if (err) 240 goto vcpu_uninit; 241 242 return vcpu; 243vcpu_uninit: 244 kvm_vcpu_uninit(vcpu); 245free_vcpu: 246 kmem_cache_free(kvm_vcpu_cache, vcpu); 247out: 248 return ERR_PTR(err); 249} 250 251void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 252{ 253} 254 255void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) 256{ 257 kvm_mmu_free_memory_caches(vcpu); 258 kvm_timer_vcpu_terminate(vcpu); 259 kvm_vgic_vcpu_destroy(vcpu); 260 kmem_cache_free(kvm_vcpu_cache, vcpu); 261} 262 263void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 264{ 265 kvm_arch_vcpu_free(vcpu); 266} 267 268int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 269{ 270 return kvm_timer_should_fire(vcpu); 271} 272 273int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 274{ 275 /* Force users to call KVM_ARM_VCPU_INIT */ 276 vcpu->arch.target = -1; 277 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); 278 279 /* Set up the timer */ 280 kvm_timer_vcpu_init(vcpu); 281 282 return 0; 283} 284 285void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 286{ 287 vcpu->cpu = cpu; 288 vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state); 289 290 kvm_arm_set_running_vcpu(vcpu); 291} 292 293void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 294{ 295 /* 296 * The arch-generic KVM code expects the cpu field of a vcpu to be -1 297 * if the vcpu is no longer assigned to a cpu. This is used for the 298 * optimized make_all_cpus_request path. 299 */ 300 vcpu->cpu = -1; 301 302 kvm_arm_set_running_vcpu(NULL); 303} 304 305int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 306 struct kvm_guest_debug *dbg) 307{ 308 return -EINVAL; 309} 310 311 312int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 313 struct kvm_mp_state *mp_state) 314{ 315 if (vcpu->arch.pause) 316 mp_state->mp_state = KVM_MP_STATE_STOPPED; 317 else 318 mp_state->mp_state = KVM_MP_STATE_RUNNABLE; 319 320 return 0; 321} 322 323int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 324 struct kvm_mp_state *mp_state) 325{ 326 switch (mp_state->mp_state) { 327 case KVM_MP_STATE_RUNNABLE: 328 vcpu->arch.pause = false; 329 break; 330 case KVM_MP_STATE_STOPPED: 331 vcpu->arch.pause = true; 332 break; 333 default: 334 return -EINVAL; 335 } 336 337 return 0; 338} 339 340/** 341 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled 342 * @v: The VCPU pointer 343 * 344 * If the guest CPU is not waiting for interrupts or an interrupt line is 345 * asserted, the CPU is by definition runnable. 346 */ 347int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) 348{ 349 return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v); 350} 351 352/* Just ensure a guest exit from a particular CPU */ 353static void exit_vm_noop(void *info) 354{ 355} 356 357void force_vm_exit(const cpumask_t *mask) 358{ 359 smp_call_function_many(mask, exit_vm_noop, NULL, true); 360} 361 362/** 363 * need_new_vmid_gen - check that the VMID is still valid 364 * @kvm: The VM's VMID to checkt 365 * 366 * return true if there is a new generation of VMIDs being used 367 * 368 * The hardware supports only 256 values with the value zero reserved for the 369 * host, so we check if an assigned value belongs to a previous generation, 370 * which which requires us to assign a new value. If we're the first to use a 371 * VMID for the new generation, we must flush necessary caches and TLBs on all 372 * CPUs. 373 */ 374static bool need_new_vmid_gen(struct kvm *kvm) 375{ 376 return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); 377} 378 379/** 380 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs 381 * @kvm The guest that we are about to run 382 * 383 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the 384 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding 385 * caches and TLBs. 386 */ 387static void update_vttbr(struct kvm *kvm) 388{ 389 phys_addr_t pgd_phys; 390 u64 vmid; 391 392 if (!need_new_vmid_gen(kvm)) 393 return; 394 395 spin_lock(&kvm_vmid_lock); 396 397 /* 398 * We need to re-check the vmid_gen here to ensure that if another vcpu 399 * already allocated a valid vmid for this vm, then this vcpu should 400 * use the same vmid. 401 */ 402 if (!need_new_vmid_gen(kvm)) { 403 spin_unlock(&kvm_vmid_lock); 404 return; 405 } 406 407 /* First user of a new VMID generation? */ 408 if (unlikely(kvm_next_vmid == 0)) { 409 atomic64_inc(&kvm_vmid_gen); 410 kvm_next_vmid = 1; 411 412 /* 413 * On SMP we know no other CPUs can use this CPU's or each 414 * other's VMID after force_vm_exit returns since the 415 * kvm_vmid_lock blocks them from reentry to the guest. 416 */ 417 force_vm_exit(cpu_all_mask); 418 /* 419 * Now broadcast TLB + ICACHE invalidation over the inner 420 * shareable domain to make sure all data structures are 421 * clean. 422 */ 423 kvm_call_hyp(__kvm_flush_vm_context); 424 } 425 426 kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); 427 kvm->arch.vmid = kvm_next_vmid; 428 kvm_next_vmid++; 429 430 /* update vttbr to be used with the new vmid */ 431 pgd_phys = virt_to_phys(kvm_get_hwpgd(kvm)); 432 BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK); 433 vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK; 434 kvm->arch.vttbr = pgd_phys | vmid; 435 436 spin_unlock(&kvm_vmid_lock); 437} 438 439static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) 440{ 441 struct kvm *kvm = vcpu->kvm; 442 int ret; 443 444 if (likely(vcpu->arch.has_run_once)) 445 return 0; 446 447 vcpu->arch.has_run_once = true; 448 449 /* 450 * Map the VGIC hardware resources before running a vcpu the first 451 * time on this VM. 452 */ 453 if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) { 454 ret = kvm_vgic_map_resources(kvm); 455 if (ret) 456 return ret; 457 } 458 459 /* 460 * Enable the arch timers only if we have an in-kernel VGIC 461 * and it has been properly initialized, since we cannot handle 462 * interrupts from the virtual timer with a userspace gic. 463 */ 464 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) 465 kvm_timer_enable(kvm); 466 467 return 0; 468} 469 470bool kvm_arch_intc_initialized(struct kvm *kvm) 471{ 472 return vgic_initialized(kvm); 473} 474 475static void vcpu_pause(struct kvm_vcpu *vcpu) 476{ 477 wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); 478 479 wait_event_interruptible(*wq, !vcpu->arch.pause); 480} 481 482static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) 483{ 484 return vcpu->arch.target >= 0; 485} 486 487/** 488 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code 489 * @vcpu: The VCPU pointer 490 * @run: The kvm_run structure pointer used for userspace state exchange 491 * 492 * This function is called through the VCPU_RUN ioctl called from user space. It 493 * will execute VM code in a loop until the time slice for the process is used 494 * or some emulation is needed from user space in which case the function will 495 * return with return value 0 and with the kvm_run structure filled in with the 496 * required data for the requested emulation. 497 */ 498int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) 499{ 500 int ret; 501 sigset_t sigsaved; 502 503 if (unlikely(!kvm_vcpu_initialized(vcpu))) 504 return -ENOEXEC; 505 506 ret = kvm_vcpu_first_run_init(vcpu); 507 if (ret) 508 return ret; 509 510 if (run->exit_reason == KVM_EXIT_MMIO) { 511 ret = kvm_handle_mmio_return(vcpu, vcpu->run); 512 if (ret) 513 return ret; 514 } 515 516 if (vcpu->sigset_active) 517 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); 518 519 ret = 1; 520 run->exit_reason = KVM_EXIT_UNKNOWN; 521 while (ret > 0) { 522 /* 523 * Check conditions before entering the guest 524 */ 525 cond_resched(); 526 527 update_vttbr(vcpu->kvm); 528 529 if (vcpu->arch.pause) 530 vcpu_pause(vcpu); 531 532 kvm_vgic_flush_hwstate(vcpu); 533 kvm_timer_flush_hwstate(vcpu); 534 535 local_irq_disable(); 536 537 /* 538 * Re-check atomic conditions 539 */ 540 if (signal_pending(current)) { 541 ret = -EINTR; 542 run->exit_reason = KVM_EXIT_INTR; 543 } 544 545 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) { 546 local_irq_enable(); 547 kvm_timer_sync_hwstate(vcpu); 548 kvm_vgic_sync_hwstate(vcpu); 549 continue; 550 } 551 552 /************************************************************** 553 * Enter the guest 554 */ 555 trace_kvm_entry(*vcpu_pc(vcpu)); 556 kvm_guest_enter(); 557 vcpu->mode = IN_GUEST_MODE; 558 559 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); 560 561 vcpu->mode = OUTSIDE_GUEST_MODE; 562 kvm_guest_exit(); 563 trace_kvm_exit(kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu)); 564 /* 565 * We may have taken a host interrupt in HYP mode (ie 566 * while executing the guest). This interrupt is still 567 * pending, as we haven't serviced it yet! 568 * 569 * We're now back in SVC mode, with interrupts 570 * disabled. Enabling the interrupts now will have 571 * the effect of taking the interrupt again, in SVC 572 * mode this time. 573 */ 574 local_irq_enable(); 575 576 /* 577 * Back from guest 578 *************************************************************/ 579 580 kvm_timer_sync_hwstate(vcpu); 581 kvm_vgic_sync_hwstate(vcpu); 582 583 ret = handle_exit(vcpu, run, ret); 584 } 585 586 if (vcpu->sigset_active) 587 sigprocmask(SIG_SETMASK, &sigsaved, NULL); 588 return ret; 589} 590 591static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) 592{ 593 int bit_index; 594 bool set; 595 unsigned long *ptr; 596 597 if (number == KVM_ARM_IRQ_CPU_IRQ) 598 bit_index = __ffs(HCR_VI); 599 else /* KVM_ARM_IRQ_CPU_FIQ */ 600 bit_index = __ffs(HCR_VF); 601 602 ptr = (unsigned long *)&vcpu->arch.irq_lines; 603 if (level) 604 set = test_and_set_bit(bit_index, ptr); 605 else 606 set = test_and_clear_bit(bit_index, ptr); 607 608 /* 609 * If we didn't change anything, no need to wake up or kick other CPUs 610 */ 611 if (set == level) 612 return 0; 613 614 /* 615 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and 616 * trigger a world-switch round on the running physical CPU to set the 617 * virtual IRQ/FIQ fields in the HCR appropriately. 618 */ 619 kvm_vcpu_kick(vcpu); 620 621 return 0; 622} 623 624int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, 625 bool line_status) 626{ 627 u32 irq = irq_level->irq; 628 unsigned int irq_type, vcpu_idx, irq_num; 629 int nrcpus = atomic_read(&kvm->online_vcpus); 630 struct kvm_vcpu *vcpu = NULL; 631 bool level = irq_level->level; 632 633 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; 634 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; 635 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; 636 637 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); 638 639 switch (irq_type) { 640 case KVM_ARM_IRQ_TYPE_CPU: 641 if (irqchip_in_kernel(kvm)) 642 return -ENXIO; 643 644 if (vcpu_idx >= nrcpus) 645 return -EINVAL; 646 647 vcpu = kvm_get_vcpu(kvm, vcpu_idx); 648 if (!vcpu) 649 return -EINVAL; 650 651 if (irq_num > KVM_ARM_IRQ_CPU_FIQ) 652 return -EINVAL; 653 654 return vcpu_interrupt_line(vcpu, irq_num, level); 655 case KVM_ARM_IRQ_TYPE_PPI: 656 if (!irqchip_in_kernel(kvm)) 657 return -ENXIO; 658 659 if (vcpu_idx >= nrcpus) 660 return -EINVAL; 661 662 vcpu = kvm_get_vcpu(kvm, vcpu_idx); 663 if (!vcpu) 664 return -EINVAL; 665 666 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) 667 return -EINVAL; 668 669 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level); 670 case KVM_ARM_IRQ_TYPE_SPI: 671 if (!irqchip_in_kernel(kvm)) 672 return -ENXIO; 673 674 if (irq_num < VGIC_NR_PRIVATE_IRQS) 675 return -EINVAL; 676 677 return kvm_vgic_inject_irq(kvm, 0, irq_num, level); 678 } 679 680 return -EINVAL; 681} 682 683static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, 684 const struct kvm_vcpu_init *init) 685{ 686 unsigned int i; 687 int phys_target = kvm_target_cpu(); 688 689 if (init->target != phys_target) 690 return -EINVAL; 691 692 /* 693 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must 694 * use the same target. 695 */ 696 if (vcpu->arch.target != -1 && vcpu->arch.target != init->target) 697 return -EINVAL; 698 699 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ 700 for (i = 0; i < sizeof(init->features) * 8; i++) { 701 bool set = (init->features[i / 32] & (1 << (i % 32))); 702 703 if (set && i >= KVM_VCPU_MAX_FEATURES) 704 return -ENOENT; 705 706 /* 707 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must 708 * use the same feature set. 709 */ 710 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES && 711 test_bit(i, vcpu->arch.features) != set) 712 return -EINVAL; 713 714 if (set) 715 set_bit(i, vcpu->arch.features); 716 } 717 718 vcpu->arch.target = phys_target; 719 720 /* Now we know what it is, we can reset it. */ 721 return kvm_reset_vcpu(vcpu); 722} 723 724 725static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, 726 struct kvm_vcpu_init *init) 727{ 728 int ret; 729 730 ret = kvm_vcpu_set_target(vcpu, init); 731 if (ret) 732 return ret; 733 734 /* 735 * Ensure a rebooted VM will fault in RAM pages and detect if the 736 * guest MMU is turned off and flush the caches as needed. 737 */ 738 if (vcpu->arch.has_run_once) 739 stage2_unmap_vm(vcpu->kvm); 740 741 vcpu_reset_hcr(vcpu); 742 743 /* 744 * Handle the "start in power-off" case by marking the VCPU as paused. 745 */ 746 if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) 747 vcpu->arch.pause = true; 748 else 749 vcpu->arch.pause = false; 750 751 return 0; 752} 753 754long kvm_arch_vcpu_ioctl(struct file *filp, 755 unsigned int ioctl, unsigned long arg) 756{ 757 struct kvm_vcpu *vcpu = filp->private_data; 758 void __user *argp = (void __user *)arg; 759 760 switch (ioctl) { 761 case KVM_ARM_VCPU_INIT: { 762 struct kvm_vcpu_init init; 763 764 if (copy_from_user(&init, argp, sizeof(init))) 765 return -EFAULT; 766 767 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init); 768 } 769 case KVM_SET_ONE_REG: 770 case KVM_GET_ONE_REG: { 771 struct kvm_one_reg reg; 772 773 if (unlikely(!kvm_vcpu_initialized(vcpu))) 774 return -ENOEXEC; 775 776 if (copy_from_user(®, argp, sizeof(reg))) 777 return -EFAULT; 778 if (ioctl == KVM_SET_ONE_REG) 779 return kvm_arm_set_reg(vcpu, ®); 780 else 781 return kvm_arm_get_reg(vcpu, ®); 782 } 783 case KVM_GET_REG_LIST: { 784 struct kvm_reg_list __user *user_list = argp; 785 struct kvm_reg_list reg_list; 786 unsigned n; 787 788 if (unlikely(!kvm_vcpu_initialized(vcpu))) 789 return -ENOEXEC; 790 791 if (copy_from_user(®_list, user_list, sizeof(reg_list))) 792 return -EFAULT; 793 n = reg_list.n; 794 reg_list.n = kvm_arm_num_regs(vcpu); 795 if (copy_to_user(user_list, ®_list, sizeof(reg_list))) 796 return -EFAULT; 797 if (n < reg_list.n) 798 return -E2BIG; 799 return kvm_arm_copy_reg_indices(vcpu, user_list->reg); 800 } 801 default: 802 return -EINVAL; 803 } 804} 805 806/** 807 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot 808 * @kvm: kvm instance 809 * @log: slot id and address to which we copy the log 810 * 811 * Steps 1-4 below provide general overview of dirty page logging. See 812 * kvm_get_dirty_log_protect() function description for additional details. 813 * 814 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we 815 * always flush the TLB (step 4) even if previous step failed and the dirty 816 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API 817 * does not preclude user space subsequent dirty log read. Flushing TLB ensures 818 * writes will be marked dirty for next log read. 819 * 820 * 1. Take a snapshot of the bit and clear it if needed. 821 * 2. Write protect the corresponding page. 822 * 3. Copy the snapshot to the userspace. 823 * 4. Flush TLB's if needed. 824 */ 825int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) 826{ 827 bool is_dirty = false; 828 int r; 829 830 mutex_lock(&kvm->slots_lock); 831 832 r = kvm_get_dirty_log_protect(kvm, log, &is_dirty); 833 834 if (is_dirty) 835 kvm_flush_remote_tlbs(kvm); 836 837 mutex_unlock(&kvm->slots_lock); 838 return r; 839} 840 841static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, 842 struct kvm_arm_device_addr *dev_addr) 843{ 844 unsigned long dev_id, type; 845 846 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >> 847 KVM_ARM_DEVICE_ID_SHIFT; 848 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >> 849 KVM_ARM_DEVICE_TYPE_SHIFT; 850 851 switch (dev_id) { 852 case KVM_ARM_DEVICE_VGIC_V2: 853 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true); 854 default: 855 return -ENODEV; 856 } 857} 858 859long kvm_arch_vm_ioctl(struct file *filp, 860 unsigned int ioctl, unsigned long arg) 861{ 862 struct kvm *kvm = filp->private_data; 863 void __user *argp = (void __user *)arg; 864 865 switch (ioctl) { 866 case KVM_CREATE_IRQCHIP: { 867 return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2); 868 } 869 case KVM_ARM_SET_DEVICE_ADDR: { 870 struct kvm_arm_device_addr dev_addr; 871 872 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) 873 return -EFAULT; 874 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); 875 } 876 case KVM_ARM_PREFERRED_TARGET: { 877 int err; 878 struct kvm_vcpu_init init; 879 880 err = kvm_vcpu_preferred_target(&init); 881 if (err) 882 return err; 883 884 if (copy_to_user(argp, &init, sizeof(init))) 885 return -EFAULT; 886 887 return 0; 888 } 889 default: 890 return -EINVAL; 891 } 892} 893 894static void cpu_init_hyp_mode(void *dummy) 895{ 896 phys_addr_t boot_pgd_ptr; 897 phys_addr_t pgd_ptr; 898 unsigned long hyp_stack_ptr; 899 unsigned long stack_page; 900 unsigned long vector_ptr; 901 902 /* Switch from the HYP stub to our own HYP init vector */ 903 __hyp_set_vectors(kvm_get_idmap_vector()); 904 905 boot_pgd_ptr = kvm_mmu_get_boot_httbr(); 906 pgd_ptr = kvm_mmu_get_httbr(); 907 stack_page = __this_cpu_read(kvm_arm_hyp_stack_page); 908 hyp_stack_ptr = stack_page + PAGE_SIZE; 909 vector_ptr = (unsigned long)__kvm_hyp_vector; 910 911 __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr); 912} 913 914static int hyp_init_cpu_notify(struct notifier_block *self, 915 unsigned long action, void *cpu) 916{ 917 switch (action) { 918 case CPU_STARTING: 919 case CPU_STARTING_FROZEN: 920 if (__hyp_get_vectors() == hyp_default_vectors) 921 cpu_init_hyp_mode(NULL); 922 break; 923 } 924 925 return NOTIFY_OK; 926} 927 928static struct notifier_block hyp_init_cpu_nb = { 929 .notifier_call = hyp_init_cpu_notify, 930}; 931 932#ifdef CONFIG_CPU_PM 933static int hyp_init_cpu_pm_notifier(struct notifier_block *self, 934 unsigned long cmd, 935 void *v) 936{ 937 if (cmd == CPU_PM_EXIT && 938 __hyp_get_vectors() == hyp_default_vectors) { 939 cpu_init_hyp_mode(NULL); 940 return NOTIFY_OK; 941 } 942 943 return NOTIFY_DONE; 944} 945 946static struct notifier_block hyp_init_cpu_pm_nb = { 947 .notifier_call = hyp_init_cpu_pm_notifier, 948}; 949 950static void __init hyp_cpu_pm_init(void) 951{ 952 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb); 953} 954#else 955static inline void hyp_cpu_pm_init(void) 956{ 957} 958#endif 959 960/** 961 * Inits Hyp-mode on all online CPUs 962 */ 963static int init_hyp_mode(void) 964{ 965 int cpu; 966 int err = 0; 967 968 /* 969 * Allocate Hyp PGD and setup Hyp identity mapping 970 */ 971 err = kvm_mmu_init(); 972 if (err) 973 goto out_err; 974 975 /* 976 * It is probably enough to obtain the default on one 977 * CPU. It's unlikely to be different on the others. 978 */ 979 hyp_default_vectors = __hyp_get_vectors(); 980 981 /* 982 * Allocate stack pages for Hypervisor-mode 983 */ 984 for_each_possible_cpu(cpu) { 985 unsigned long stack_page; 986 987 stack_page = __get_free_page(GFP_KERNEL); 988 if (!stack_page) { 989 err = -ENOMEM; 990 goto out_free_stack_pages; 991 } 992 993 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page; 994 } 995 996 /* 997 * Map the Hyp-code called directly from the host 998 */ 999 err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end); 1000 if (err) { 1001 kvm_err("Cannot map world-switch code\n"); 1002 goto out_free_mappings; 1003 } 1004 1005 /* 1006 * Map the Hyp stack pages 1007 */ 1008 for_each_possible_cpu(cpu) { 1009 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu); 1010 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE); 1011 1012 if (err) { 1013 kvm_err("Cannot map hyp stack\n"); 1014 goto out_free_mappings; 1015 } 1016 } 1017 1018 /* 1019 * Map the host CPU structures 1020 */ 1021 kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t); 1022 if (!kvm_host_cpu_state) { 1023 err = -ENOMEM; 1024 kvm_err("Cannot allocate host CPU state\n"); 1025 goto out_free_mappings; 1026 } 1027 1028 for_each_possible_cpu(cpu) { 1029 kvm_cpu_context_t *cpu_ctxt; 1030 1031 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu); 1032 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1); 1033 1034 if (err) { 1035 kvm_err("Cannot map host CPU state: %d\n", err); 1036 goto out_free_context; 1037 } 1038 } 1039 1040 /* 1041 * Execute the init code on each CPU. 1042 */ 1043 on_each_cpu(cpu_init_hyp_mode, NULL, 1); 1044 1045 /* 1046 * Init HYP view of VGIC 1047 */ 1048 err = kvm_vgic_hyp_init(); 1049 if (err) 1050 goto out_free_context; 1051 1052 /* 1053 * Init HYP architected timer support 1054 */ 1055 err = kvm_timer_hyp_init(); 1056 if (err) 1057 goto out_free_mappings; 1058 1059#ifndef CONFIG_HOTPLUG_CPU 1060 free_boot_hyp_pgd(); 1061#endif 1062 1063 kvm_perf_init(); 1064 1065 kvm_info("Hyp mode initialized successfully\n"); 1066 1067 return 0; 1068out_free_context: 1069 free_percpu(kvm_host_cpu_state); 1070out_free_mappings: 1071 free_hyp_pgds(); 1072out_free_stack_pages: 1073 for_each_possible_cpu(cpu) 1074 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); 1075out_err: 1076 kvm_err("error initializing Hyp mode: %d\n", err); 1077 return err; 1078} 1079 1080static void check_kvm_target_cpu(void *ret) 1081{ 1082 *(int *)ret = kvm_target_cpu(); 1083} 1084 1085struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr) 1086{ 1087 struct kvm_vcpu *vcpu; 1088 int i; 1089 1090 mpidr &= MPIDR_HWID_BITMASK; 1091 kvm_for_each_vcpu(i, vcpu, kvm) { 1092 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu)) 1093 return vcpu; 1094 } 1095 return NULL; 1096} 1097 1098/** 1099 * Initialize Hyp-mode and memory mappings on all CPUs. 1100 */ 1101int kvm_arch_init(void *opaque) 1102{ 1103 int err; 1104 int ret, cpu; 1105 1106 if (!is_hyp_mode_available()) { 1107 kvm_err("HYP mode not available\n"); 1108 return -ENODEV; 1109 } 1110 1111 for_each_online_cpu(cpu) { 1112 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1); 1113 if (ret < 0) { 1114 kvm_err("Error, CPU %d not supported!\n", cpu); 1115 return -ENODEV; 1116 } 1117 } 1118 1119 cpu_notifier_register_begin(); 1120 1121 err = init_hyp_mode(); 1122 if (err) 1123 goto out_err; 1124 1125 err = __register_cpu_notifier(&hyp_init_cpu_nb); 1126 if (err) { 1127 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err); 1128 goto out_err; 1129 } 1130 1131 cpu_notifier_register_done(); 1132 1133 hyp_cpu_pm_init(); 1134 1135 kvm_coproc_table_init(); 1136 return 0; 1137out_err: 1138 cpu_notifier_register_done(); 1139 return err; 1140} 1141 1142/* NOP: Compiling as a module not supported */ 1143void kvm_arch_exit(void) 1144{ 1145 kvm_perf_teardown(); 1146} 1147 1148static int arm_init(void) 1149{ 1150 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); 1151 return rc; 1152} 1153 1154module_init(arm_init); 1155