2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
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.
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.
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.
19 #include <linux/cpu_pm.h>
20 #include <linux/errno.h>
21 #include <linux/err.h>
22 #include <linux/kvm_host.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
26 #include <linux/mman.h>
27 #include <linux/sched.h>
28 #include <linux/kvm.h>
29 #include <trace/events/kvm.h>
31 #define CREATE_TRACE_POINTS
34 #include <asm/uaccess.h>
35 #include <asm/ptrace.h>
37 #include <asm/tlbflush.h>
38 #include <asm/cacheflush.h>
40 #include <asm/kvm_arm.h>
41 #include <asm/kvm_asm.h>
42 #include <asm/kvm_mmu.h>
43 #include <asm/kvm_emulate.h>
44 #include <asm/kvm_coproc.h>
45 #include <asm/kvm_psci.h>
46 #include <asm/sections.h>
49 __asm__(".arch_extension virt");
52 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
53 static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
54 static unsigned long hyp_default_vectors;
56 /* Per-CPU variable containing the currently running vcpu. */
57 static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
59 /* The VMID used in the VTTBR */
60 static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
61 static u32 kvm_next_vmid;
62 static unsigned int kvm_vmid_bits __read_mostly;
63 static DEFINE_SPINLOCK(kvm_vmid_lock);
65 static bool vgic_present;
67 static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
69 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
71 BUG_ON(preemptible());
72 __this_cpu_write(kvm_arm_running_vcpu, vcpu);
76 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
77 * Must be called from non-preemptible context
79 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
81 BUG_ON(preemptible());
82 return __this_cpu_read(kvm_arm_running_vcpu);
86 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
88 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
90 return &kvm_arm_running_vcpu;
93 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
95 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
98 int kvm_arch_hardware_setup(void)
103 void kvm_arch_check_processor_compat(void *rtn)
110 * kvm_arch_init_vm - initializes a VM data structure
111 * @kvm: pointer to the KVM struct
113 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
120 ret = kvm_alloc_stage2_pgd(kvm);
124 ret = create_hyp_mappings(kvm, kvm + 1);
126 goto out_free_stage2_pgd;
128 kvm_vgic_early_init(kvm);
131 /* Mark the initial VMID generation invalid */
132 kvm->arch.vmid_gen = 0;
134 /* The maximum number of VCPUs is limited by the host's GIC model */
135 kvm->arch.max_vcpus = vgic_present ?
136 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
140 kvm_free_stage2_pgd(kvm);
145 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
147 return VM_FAULT_SIGBUS;
152 * kvm_arch_destroy_vm - destroy the VM data structure
153 * @kvm: pointer to the KVM struct
155 void kvm_arch_destroy_vm(struct kvm *kvm)
159 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
161 kvm_arch_vcpu_free(kvm->vcpus[i]);
162 kvm->vcpus[i] = NULL;
166 kvm_vgic_destroy(kvm);
169 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
173 case KVM_CAP_IRQCHIP:
176 case KVM_CAP_IOEVENTFD:
177 case KVM_CAP_DEVICE_CTRL:
178 case KVM_CAP_USER_MEMORY:
179 case KVM_CAP_SYNC_MMU:
180 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
181 case KVM_CAP_ONE_REG:
182 case KVM_CAP_ARM_PSCI:
183 case KVM_CAP_ARM_PSCI_0_2:
184 case KVM_CAP_READONLY_MEM:
185 case KVM_CAP_MP_STATE:
188 case KVM_CAP_COALESCED_MMIO:
189 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
191 case KVM_CAP_ARM_SET_DEVICE_ADDR:
194 case KVM_CAP_NR_VCPUS:
195 r = num_online_cpus();
197 case KVM_CAP_MAX_VCPUS:
201 r = kvm_arch_dev_ioctl_check_extension(ext);
207 long kvm_arch_dev_ioctl(struct file *filp,
208 unsigned int ioctl, unsigned long arg)
214 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
217 struct kvm_vcpu *vcpu;
219 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
224 if (id >= kvm->arch.max_vcpus) {
229 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
235 err = kvm_vcpu_init(vcpu, kvm, id);
239 err = create_hyp_mappings(vcpu, vcpu + 1);
245 kvm_vcpu_uninit(vcpu);
247 kmem_cache_free(kvm_vcpu_cache, vcpu);
252 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
254 kvm_vgic_vcpu_early_init(vcpu);
257 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
259 kvm_mmu_free_memory_caches(vcpu);
260 kvm_timer_vcpu_terminate(vcpu);
261 kvm_vgic_vcpu_destroy(vcpu);
262 kmem_cache_free(kvm_vcpu_cache, vcpu);
265 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
267 kvm_arch_vcpu_free(vcpu);
270 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
272 return kvm_timer_should_fire(vcpu);
275 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
277 kvm_timer_schedule(vcpu);
280 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
282 kvm_timer_unschedule(vcpu);
285 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
287 /* Force users to call KVM_ARM_VCPU_INIT */
288 vcpu->arch.target = -1;
289 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
291 /* Set up the timer */
292 kvm_timer_vcpu_init(vcpu);
294 kvm_arm_reset_debug_ptr(vcpu);
299 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
302 vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
304 kvm_arm_set_running_vcpu(vcpu);
307 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
310 * The arch-generic KVM code expects the cpu field of a vcpu to be -1
311 * if the vcpu is no longer assigned to a cpu. This is used for the
312 * optimized make_all_cpus_request path.
316 kvm_arm_set_running_vcpu(NULL);
319 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
320 struct kvm_mp_state *mp_state)
322 if (vcpu->arch.power_off)
323 mp_state->mp_state = KVM_MP_STATE_STOPPED;
325 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
330 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
331 struct kvm_mp_state *mp_state)
333 switch (mp_state->mp_state) {
334 case KVM_MP_STATE_RUNNABLE:
335 vcpu->arch.power_off = false;
337 case KVM_MP_STATE_STOPPED:
338 vcpu->arch.power_off = true;
348 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
349 * @v: The VCPU pointer
351 * If the guest CPU is not waiting for interrupts or an interrupt line is
352 * asserted, the CPU is by definition runnable.
354 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
356 return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
357 && !v->arch.power_off && !v->arch.pause);
360 /* Just ensure a guest exit from a particular CPU */
361 static void exit_vm_noop(void *info)
365 void force_vm_exit(const cpumask_t *mask)
367 smp_call_function_many(mask, exit_vm_noop, NULL, true);
371 * need_new_vmid_gen - check that the VMID is still valid
372 * @kvm: The VM's VMID to checkt
374 * return true if there is a new generation of VMIDs being used
376 * The hardware supports only 256 values with the value zero reserved for the
377 * host, so we check if an assigned value belongs to a previous generation,
378 * which which requires us to assign a new value. If we're the first to use a
379 * VMID for the new generation, we must flush necessary caches and TLBs on all
382 static bool need_new_vmid_gen(struct kvm *kvm)
384 return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
388 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
389 * @kvm The guest that we are about to run
391 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
392 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
395 static void update_vttbr(struct kvm *kvm)
397 phys_addr_t pgd_phys;
400 if (!need_new_vmid_gen(kvm))
403 spin_lock(&kvm_vmid_lock);
406 * We need to re-check the vmid_gen here to ensure that if another vcpu
407 * already allocated a valid vmid for this vm, then this vcpu should
410 if (!need_new_vmid_gen(kvm)) {
411 spin_unlock(&kvm_vmid_lock);
415 /* First user of a new VMID generation? */
416 if (unlikely(kvm_next_vmid == 0)) {
417 atomic64_inc(&kvm_vmid_gen);
421 * On SMP we know no other CPUs can use this CPU's or each
422 * other's VMID after force_vm_exit returns since the
423 * kvm_vmid_lock blocks them from reentry to the guest.
425 force_vm_exit(cpu_all_mask);
427 * Now broadcast TLB + ICACHE invalidation over the inner
428 * shareable domain to make sure all data structures are
431 kvm_call_hyp(__kvm_flush_vm_context);
434 kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
435 kvm->arch.vmid = kvm_next_vmid;
437 kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
439 /* update vttbr to be used with the new vmid */
440 pgd_phys = virt_to_phys(kvm_get_hwpgd(kvm));
441 BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
442 vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
443 kvm->arch.vttbr = pgd_phys | vmid;
445 spin_unlock(&kvm_vmid_lock);
448 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
450 struct kvm *kvm = vcpu->kvm;
453 if (likely(vcpu->arch.has_run_once))
456 vcpu->arch.has_run_once = true;
459 * Map the VGIC hardware resources before running a vcpu the first
462 if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
463 ret = kvm_vgic_map_resources(kvm);
469 * Enable the arch timers only if we have an in-kernel VGIC
470 * and it has been properly initialized, since we cannot handle
471 * interrupts from the virtual timer with a userspace gic.
473 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
474 kvm_timer_enable(kvm);
479 bool kvm_arch_intc_initialized(struct kvm *kvm)
481 return vgic_initialized(kvm);
484 static void kvm_arm_halt_guest(struct kvm *kvm) __maybe_unused;
485 static void kvm_arm_resume_guest(struct kvm *kvm) __maybe_unused;
487 static void kvm_arm_halt_guest(struct kvm *kvm)
490 struct kvm_vcpu *vcpu;
492 kvm_for_each_vcpu(i, vcpu, kvm)
493 vcpu->arch.pause = true;
494 force_vm_exit(cpu_all_mask);
497 static void kvm_arm_resume_guest(struct kvm *kvm)
500 struct kvm_vcpu *vcpu;
502 kvm_for_each_vcpu(i, vcpu, kvm) {
503 wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
505 vcpu->arch.pause = false;
506 wake_up_interruptible(wq);
510 static void vcpu_sleep(struct kvm_vcpu *vcpu)
512 wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
514 wait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
515 (!vcpu->arch.pause)));
518 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
520 return vcpu->arch.target >= 0;
524 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
525 * @vcpu: The VCPU pointer
526 * @run: The kvm_run structure pointer used for userspace state exchange
528 * This function is called through the VCPU_RUN ioctl called from user space. It
529 * will execute VM code in a loop until the time slice for the process is used
530 * or some emulation is needed from user space in which case the function will
531 * return with return value 0 and with the kvm_run structure filled in with the
532 * required data for the requested emulation.
534 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
539 if (unlikely(!kvm_vcpu_initialized(vcpu)))
542 ret = kvm_vcpu_first_run_init(vcpu);
546 if (run->exit_reason == KVM_EXIT_MMIO) {
547 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
552 if (vcpu->sigset_active)
553 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
556 run->exit_reason = KVM_EXIT_UNKNOWN;
559 * Check conditions before entering the guest
563 update_vttbr(vcpu->kvm);
565 if (vcpu->arch.power_off || vcpu->arch.pause)
569 * Preparing the interrupts to be injected also
570 * involves poking the GIC, which must be done in a
571 * non-preemptible context.
574 kvm_timer_flush_hwstate(vcpu);
575 kvm_vgic_flush_hwstate(vcpu);
580 * Re-check atomic conditions
582 if (signal_pending(current)) {
584 run->exit_reason = KVM_EXIT_INTR;
587 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
588 vcpu->arch.power_off || vcpu->arch.pause) {
590 kvm_timer_sync_hwstate(vcpu);
591 kvm_vgic_sync_hwstate(vcpu);
596 kvm_arm_setup_debug(vcpu);
598 /**************************************************************
601 trace_kvm_entry(*vcpu_pc(vcpu));
603 vcpu->mode = IN_GUEST_MODE;
605 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
607 vcpu->mode = OUTSIDE_GUEST_MODE;
610 *************************************************************/
612 kvm_arm_clear_debug(vcpu);
615 * We may have taken a host interrupt in HYP mode (ie
616 * while executing the guest). This interrupt is still
617 * pending, as we haven't serviced it yet!
619 * We're now back in SVC mode, with interrupts
620 * disabled. Enabling the interrupts now will have
621 * the effect of taking the interrupt again, in SVC
627 * We do local_irq_enable() before calling kvm_guest_exit() so
628 * that if a timer interrupt hits while running the guest we
629 * account that tick as being spent in the guest. We enable
630 * preemption after calling kvm_guest_exit() so that if we get
631 * preempted we make sure ticks after that is not counted as
635 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
638 * We must sync the timer state before the vgic state so that
639 * the vgic can properly sample the updated state of the
642 kvm_timer_sync_hwstate(vcpu);
644 kvm_vgic_sync_hwstate(vcpu);
648 ret = handle_exit(vcpu, run, ret);
651 if (vcpu->sigset_active)
652 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
656 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
662 if (number == KVM_ARM_IRQ_CPU_IRQ)
663 bit_index = __ffs(HCR_VI);
664 else /* KVM_ARM_IRQ_CPU_FIQ */
665 bit_index = __ffs(HCR_VF);
667 ptr = (unsigned long *)&vcpu->arch.irq_lines;
669 set = test_and_set_bit(bit_index, ptr);
671 set = test_and_clear_bit(bit_index, ptr);
674 * If we didn't change anything, no need to wake up or kick other CPUs
680 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
681 * trigger a world-switch round on the running physical CPU to set the
682 * virtual IRQ/FIQ fields in the HCR appropriately.
689 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
692 u32 irq = irq_level->irq;
693 unsigned int irq_type, vcpu_idx, irq_num;
694 int nrcpus = atomic_read(&kvm->online_vcpus);
695 struct kvm_vcpu *vcpu = NULL;
696 bool level = irq_level->level;
698 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
699 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
700 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
702 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
705 case KVM_ARM_IRQ_TYPE_CPU:
706 if (irqchip_in_kernel(kvm))
709 if (vcpu_idx >= nrcpus)
712 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
716 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
719 return vcpu_interrupt_line(vcpu, irq_num, level);
720 case KVM_ARM_IRQ_TYPE_PPI:
721 if (!irqchip_in_kernel(kvm))
724 if (vcpu_idx >= nrcpus)
727 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
731 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
734 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
735 case KVM_ARM_IRQ_TYPE_SPI:
736 if (!irqchip_in_kernel(kvm))
739 if (irq_num < VGIC_NR_PRIVATE_IRQS)
742 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
748 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
749 const struct kvm_vcpu_init *init)
752 int phys_target = kvm_target_cpu();
754 if (init->target != phys_target)
758 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
759 * use the same target.
761 if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
764 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
765 for (i = 0; i < sizeof(init->features) * 8; i++) {
766 bool set = (init->features[i / 32] & (1 << (i % 32)));
768 if (set && i >= KVM_VCPU_MAX_FEATURES)
772 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
773 * use the same feature set.
775 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
776 test_bit(i, vcpu->arch.features) != set)
780 set_bit(i, vcpu->arch.features);
783 vcpu->arch.target = phys_target;
785 /* Now we know what it is, we can reset it. */
786 return kvm_reset_vcpu(vcpu);
790 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
791 struct kvm_vcpu_init *init)
795 ret = kvm_vcpu_set_target(vcpu, init);
800 * Ensure a rebooted VM will fault in RAM pages and detect if the
801 * guest MMU is turned off and flush the caches as needed.
803 if (vcpu->arch.has_run_once)
804 stage2_unmap_vm(vcpu->kvm);
806 vcpu_reset_hcr(vcpu);
809 * Handle the "start in power-off" case.
811 if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
812 vcpu->arch.power_off = true;
814 vcpu->arch.power_off = false;
819 long kvm_arch_vcpu_ioctl(struct file *filp,
820 unsigned int ioctl, unsigned long arg)
822 struct kvm_vcpu *vcpu = filp->private_data;
823 void __user *argp = (void __user *)arg;
826 case KVM_ARM_VCPU_INIT: {
827 struct kvm_vcpu_init init;
829 if (copy_from_user(&init, argp, sizeof(init)))
832 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
834 case KVM_SET_ONE_REG:
835 case KVM_GET_ONE_REG: {
836 struct kvm_one_reg reg;
838 if (unlikely(!kvm_vcpu_initialized(vcpu)))
841 if (copy_from_user(®, argp, sizeof(reg)))
843 if (ioctl == KVM_SET_ONE_REG)
844 return kvm_arm_set_reg(vcpu, ®);
846 return kvm_arm_get_reg(vcpu, ®);
848 case KVM_GET_REG_LIST: {
849 struct kvm_reg_list __user *user_list = argp;
850 struct kvm_reg_list reg_list;
853 if (unlikely(!kvm_vcpu_initialized(vcpu)))
856 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
859 reg_list.n = kvm_arm_num_regs(vcpu);
860 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
864 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
872 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
874 * @log: slot id and address to which we copy the log
876 * Steps 1-4 below provide general overview of dirty page logging. See
877 * kvm_get_dirty_log_protect() function description for additional details.
879 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
880 * always flush the TLB (step 4) even if previous step failed and the dirty
881 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
882 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
883 * writes will be marked dirty for next log read.
885 * 1. Take a snapshot of the bit and clear it if needed.
886 * 2. Write protect the corresponding page.
887 * 3. Copy the snapshot to the userspace.
888 * 4. Flush TLB's if needed.
890 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
892 bool is_dirty = false;
895 mutex_lock(&kvm->slots_lock);
897 r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
900 kvm_flush_remote_tlbs(kvm);
902 mutex_unlock(&kvm->slots_lock);
906 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
907 struct kvm_arm_device_addr *dev_addr)
909 unsigned long dev_id, type;
911 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
912 KVM_ARM_DEVICE_ID_SHIFT;
913 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
914 KVM_ARM_DEVICE_TYPE_SHIFT;
917 case KVM_ARM_DEVICE_VGIC_V2:
920 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
926 long kvm_arch_vm_ioctl(struct file *filp,
927 unsigned int ioctl, unsigned long arg)
929 struct kvm *kvm = filp->private_data;
930 void __user *argp = (void __user *)arg;
933 case KVM_CREATE_IRQCHIP: {
936 return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
938 case KVM_ARM_SET_DEVICE_ADDR: {
939 struct kvm_arm_device_addr dev_addr;
941 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
943 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
945 case KVM_ARM_PREFERRED_TARGET: {
947 struct kvm_vcpu_init init;
949 err = kvm_vcpu_preferred_target(&init);
953 if (copy_to_user(argp, &init, sizeof(init)))
963 static void cpu_init_hyp_mode(void *dummy)
965 phys_addr_t boot_pgd_ptr;
967 unsigned long hyp_stack_ptr;
968 unsigned long stack_page;
969 unsigned long vector_ptr;
971 /* Switch from the HYP stub to our own HYP init vector */
972 __hyp_set_vectors(kvm_get_idmap_vector());
974 boot_pgd_ptr = kvm_mmu_get_boot_httbr();
975 pgd_ptr = kvm_mmu_get_httbr();
976 stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
977 hyp_stack_ptr = stack_page + PAGE_SIZE;
978 vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
980 __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
983 kvm_arm_init_debug();
986 static void cpu_hyp_reinit(void)
988 if (is_kernel_in_hyp_mode()) {
990 * __cpu_init_stage2() is safe to call even if the PM
991 * event was cancelled before the CPU was reset.
995 if (__hyp_get_vectors() == hyp_default_vectors)
996 cpu_init_hyp_mode(NULL);
1000 static void cpu_hyp_reset(void)
1002 phys_addr_t boot_pgd_ptr;
1003 phys_addr_t phys_idmap_start;
1005 if (!is_kernel_in_hyp_mode()) {
1006 boot_pgd_ptr = kvm_mmu_get_boot_httbr();
1007 phys_idmap_start = kvm_get_idmap_start();
1009 __cpu_reset_hyp_mode(boot_pgd_ptr, phys_idmap_start);
1013 static void _kvm_arch_hardware_enable(void *discard)
1015 if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1017 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1021 int kvm_arch_hardware_enable(void)
1023 _kvm_arch_hardware_enable(NULL);
1027 static void _kvm_arch_hardware_disable(void *discard)
1029 if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1031 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1035 void kvm_arch_hardware_disable(void)
1037 _kvm_arch_hardware_disable(NULL);
1040 #ifdef CONFIG_CPU_PM
1041 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1046 * kvm_arm_hardware_enabled is left with its old value over
1047 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1052 if (__this_cpu_read(kvm_arm_hardware_enabled))
1054 * don't update kvm_arm_hardware_enabled here
1055 * so that the hardware will be re-enabled
1056 * when we resume. See below.
1062 if (__this_cpu_read(kvm_arm_hardware_enabled))
1063 /* The hardware was enabled before suspend. */
1073 static struct notifier_block hyp_init_cpu_pm_nb = {
1074 .notifier_call = hyp_init_cpu_pm_notifier,
1077 static void __init hyp_cpu_pm_init(void)
1079 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1082 static inline void hyp_cpu_pm_init(void)
1087 static void teardown_common_resources(void)
1089 free_percpu(kvm_host_cpu_state);
1092 static int init_common_resources(void)
1094 kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1095 if (!kvm_host_cpu_state) {
1096 kvm_err("Cannot allocate host CPU state\n");
1103 static int init_subsystems(void)
1108 * Enable hardware so that subsystem initialisation can access EL2.
1110 on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1113 * Register CPU lower-power notifier
1118 * Init HYP view of VGIC
1120 err = kvm_vgic_hyp_init();
1123 vgic_present = true;
1127 vgic_present = false;
1135 * Init HYP architected timer support
1137 err = kvm_timer_hyp_init();
1142 kvm_coproc_table_init();
1145 on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1150 static void teardown_hyp_mode(void)
1154 if (is_kernel_in_hyp_mode())
1158 for_each_possible_cpu(cpu)
1159 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1162 static int init_vhe_mode(void)
1164 /* set size of VMID supported by CPU */
1165 kvm_vmid_bits = kvm_get_vmid_bits();
1166 kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1168 kvm_info("VHE mode initialized successfully\n");
1173 * Inits Hyp-mode on all online CPUs
1175 static int init_hyp_mode(void)
1181 * Allocate Hyp PGD and setup Hyp identity mapping
1183 err = kvm_mmu_init();
1188 * It is probably enough to obtain the default on one
1189 * CPU. It's unlikely to be different on the others.
1191 hyp_default_vectors = __hyp_get_vectors();
1194 * Allocate stack pages for Hypervisor-mode
1196 for_each_possible_cpu(cpu) {
1197 unsigned long stack_page;
1199 stack_page = __get_free_page(GFP_KERNEL);
1205 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1209 * Map the Hyp-code called directly from the host
1211 err = create_hyp_mappings(kvm_ksym_ref(__kvm_hyp_code_start),
1212 kvm_ksym_ref(__kvm_hyp_code_end));
1214 kvm_err("Cannot map world-switch code\n");
1218 err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1219 kvm_ksym_ref(__end_rodata));
1221 kvm_err("Cannot map rodata section\n");
1226 * Map the Hyp stack pages
1228 for_each_possible_cpu(cpu) {
1229 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1230 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
1233 kvm_err("Cannot map hyp stack\n");
1238 for_each_possible_cpu(cpu) {
1239 kvm_cpu_context_t *cpu_ctxt;
1241 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1242 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
1245 kvm_err("Cannot map host CPU state: %d\n", err);
1250 #ifndef CONFIG_HOTPLUG_CPU
1251 free_boot_hyp_pgd();
1254 /* set size of VMID supported by CPU */
1255 kvm_vmid_bits = kvm_get_vmid_bits();
1256 kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1258 kvm_info("Hyp mode initialized successfully\n");
1263 teardown_hyp_mode();
1264 kvm_err("error initializing Hyp mode: %d\n", err);
1268 static void check_kvm_target_cpu(void *ret)
1270 *(int *)ret = kvm_target_cpu();
1273 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1275 struct kvm_vcpu *vcpu;
1278 mpidr &= MPIDR_HWID_BITMASK;
1279 kvm_for_each_vcpu(i, vcpu, kvm) {
1280 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1287 * Initialize Hyp-mode and memory mappings on all CPUs.
1289 int kvm_arch_init(void *opaque)
1294 if (!is_hyp_mode_available()) {
1295 kvm_err("HYP mode not available\n");
1299 for_each_online_cpu(cpu) {
1300 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1302 kvm_err("Error, CPU %d not supported!\n", cpu);
1307 err = init_common_resources();
1311 if (is_kernel_in_hyp_mode())
1312 err = init_vhe_mode();
1314 err = init_hyp_mode();
1318 err = init_subsystems();
1325 teardown_hyp_mode();
1327 teardown_common_resources();
1331 /* NOP: Compiling as a module not supported */
1332 void kvm_arch_exit(void)
1334 kvm_perf_teardown();
1337 static int arm_init(void)
1339 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1343 module_init(arm_init);