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/list.h>
24 #include <linux/module.h>
25 #include <linux/vmalloc.h>
27 #include <linux/mman.h>
28 #include <linux/sched.h>
29 #include <linux/kvm.h>
30 #include <trace/events/kvm.h>
31 #include <kvm/arm_pmu.h>
33 #define CREATE_TRACE_POINTS
36 #include <linux/uaccess.h>
37 #include <asm/ptrace.h>
39 #include <asm/tlbflush.h>
40 #include <asm/cacheflush.h>
42 #include <asm/kvm_arm.h>
43 #include <asm/kvm_asm.h>
44 #include <asm/kvm_mmu.h>
45 #include <asm/kvm_emulate.h>
46 #include <asm/kvm_coproc.h>
47 #include <asm/kvm_psci.h>
48 #include <asm/sections.h>
51 __asm__(".arch_extension virt");
54 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
55 static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
56 static unsigned long hyp_default_vectors;
58 /* Per-CPU variable containing the currently running vcpu. */
59 static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
61 /* The VMID used in the VTTBR */
62 static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
63 static u32 kvm_next_vmid;
64 static unsigned int kvm_vmid_bits __read_mostly;
65 static DEFINE_SPINLOCK(kvm_vmid_lock);
67 static bool vgic_present;
69 static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
71 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
73 BUG_ON(preemptible());
74 __this_cpu_write(kvm_arm_running_vcpu, vcpu);
78 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
79 * Must be called from non-preemptible context
81 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
83 BUG_ON(preemptible());
84 return __this_cpu_read(kvm_arm_running_vcpu);
88 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
90 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
92 return &kvm_arm_running_vcpu;
95 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
97 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
100 int kvm_arch_hardware_setup(void)
105 void kvm_arch_check_processor_compat(void *rtn)
112 * kvm_arch_init_vm - initializes a VM data structure
113 * @kvm: pointer to the KVM struct
115 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
122 kvm->arch.last_vcpu_ran = alloc_percpu(typeof(*kvm->arch.last_vcpu_ran));
123 if (!kvm->arch.last_vcpu_ran)
126 for_each_possible_cpu(cpu)
127 *per_cpu_ptr(kvm->arch.last_vcpu_ran, cpu) = -1;
129 ret = kvm_alloc_stage2_pgd(kvm);
133 ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
135 goto out_free_stage2_pgd;
137 kvm_vgic_early_init(kvm);
139 /* Mark the initial VMID generation invalid */
140 kvm->arch.vmid_gen = 0;
142 /* The maximum number of VCPUs is limited by the host's GIC model */
143 kvm->arch.max_vcpus = vgic_present ?
144 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
148 kvm_free_stage2_pgd(kvm);
150 free_percpu(kvm->arch.last_vcpu_ran);
151 kvm->arch.last_vcpu_ran = NULL;
155 bool kvm_arch_has_vcpu_debugfs(void)
160 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
165 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
167 return VM_FAULT_SIGBUS;
172 * kvm_arch_destroy_vm - destroy the VM data structure
173 * @kvm: pointer to the KVM struct
175 void kvm_arch_destroy_vm(struct kvm *kvm)
179 free_percpu(kvm->arch.last_vcpu_ran);
180 kvm->arch.last_vcpu_ran = NULL;
182 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
184 kvm_arch_vcpu_free(kvm->vcpus[i]);
185 kvm->vcpus[i] = NULL;
189 kvm_vgic_destroy(kvm);
192 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
196 case KVM_CAP_IRQCHIP:
199 case KVM_CAP_IOEVENTFD:
200 case KVM_CAP_DEVICE_CTRL:
201 case KVM_CAP_USER_MEMORY:
202 case KVM_CAP_SYNC_MMU:
203 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
204 case KVM_CAP_ONE_REG:
205 case KVM_CAP_ARM_PSCI:
206 case KVM_CAP_ARM_PSCI_0_2:
207 case KVM_CAP_READONLY_MEM:
208 case KVM_CAP_MP_STATE:
209 case KVM_CAP_IMMEDIATE_EXIT:
212 case KVM_CAP_COALESCED_MMIO:
213 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
215 case KVM_CAP_ARM_SET_DEVICE_ADDR:
218 case KVM_CAP_NR_VCPUS:
219 r = num_online_cpus();
221 case KVM_CAP_MAX_VCPUS:
224 case KVM_CAP_NR_MEMSLOTS:
225 r = KVM_USER_MEM_SLOTS;
227 case KVM_CAP_MSI_DEVID:
231 r = kvm->arch.vgic.msis_require_devid;
234 r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
240 long kvm_arch_dev_ioctl(struct file *filp,
241 unsigned int ioctl, unsigned long arg)
247 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
250 struct kvm_vcpu *vcpu;
252 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
257 if (id >= kvm->arch.max_vcpus) {
262 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
268 err = kvm_vcpu_init(vcpu, kvm, id);
272 err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
278 kvm_vcpu_uninit(vcpu);
280 kmem_cache_free(kvm_vcpu_cache, vcpu);
285 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
287 kvm_vgic_vcpu_early_init(vcpu);
290 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
292 kvm_mmu_free_memory_caches(vcpu);
293 kvm_timer_vcpu_terminate(vcpu);
294 kvm_vgic_vcpu_destroy(vcpu);
295 kvm_pmu_vcpu_destroy(vcpu);
296 kvm_vcpu_uninit(vcpu);
297 kmem_cache_free(kvm_vcpu_cache, vcpu);
300 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
302 kvm_arch_vcpu_free(vcpu);
305 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
307 return kvm_timer_should_fire(vcpu_vtimer(vcpu)) ||
308 kvm_timer_should_fire(vcpu_ptimer(vcpu));
311 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
313 kvm_timer_schedule(vcpu);
316 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
318 kvm_timer_unschedule(vcpu);
321 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
323 /* Force users to call KVM_ARM_VCPU_INIT */
324 vcpu->arch.target = -1;
325 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
327 /* Set up the timer */
328 kvm_timer_vcpu_init(vcpu);
330 kvm_arm_reset_debug_ptr(vcpu);
335 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
339 last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran);
342 * We might get preempted before the vCPU actually runs, but
343 * over-invalidation doesn't affect correctness.
345 if (*last_ran != vcpu->vcpu_id) {
346 kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu);
347 *last_ran = vcpu->vcpu_id;
351 vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
353 kvm_arm_set_running_vcpu(vcpu);
356 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
359 * The arch-generic KVM code expects the cpu field of a vcpu to be -1
360 * if the vcpu is no longer assigned to a cpu. This is used for the
361 * optimized make_all_cpus_request path.
365 kvm_arm_set_running_vcpu(NULL);
366 kvm_timer_vcpu_put(vcpu);
369 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
370 struct kvm_mp_state *mp_state)
372 if (vcpu->arch.power_off)
373 mp_state->mp_state = KVM_MP_STATE_STOPPED;
375 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
380 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
381 struct kvm_mp_state *mp_state)
383 switch (mp_state->mp_state) {
384 case KVM_MP_STATE_RUNNABLE:
385 vcpu->arch.power_off = false;
387 case KVM_MP_STATE_STOPPED:
388 vcpu->arch.power_off = true;
398 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
399 * @v: The VCPU pointer
401 * If the guest CPU is not waiting for interrupts or an interrupt line is
402 * asserted, the CPU is by definition runnable.
404 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
406 return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
407 && !v->arch.power_off && !v->arch.pause);
410 /* Just ensure a guest exit from a particular CPU */
411 static void exit_vm_noop(void *info)
415 void force_vm_exit(const cpumask_t *mask)
418 smp_call_function_many(mask, exit_vm_noop, NULL, true);
423 * need_new_vmid_gen - check that the VMID is still valid
424 * @kvm: The VM's VMID to check
426 * return true if there is a new generation of VMIDs being used
428 * The hardware supports only 256 values with the value zero reserved for the
429 * host, so we check if an assigned value belongs to a previous generation,
430 * which which requires us to assign a new value. If we're the first to use a
431 * VMID for the new generation, we must flush necessary caches and TLBs on all
434 static bool need_new_vmid_gen(struct kvm *kvm)
436 return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
440 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
441 * @kvm The guest that we are about to run
443 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
444 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
447 static void update_vttbr(struct kvm *kvm)
449 phys_addr_t pgd_phys;
452 if (!need_new_vmid_gen(kvm))
455 spin_lock(&kvm_vmid_lock);
458 * We need to re-check the vmid_gen here to ensure that if another vcpu
459 * already allocated a valid vmid for this vm, then this vcpu should
462 if (!need_new_vmid_gen(kvm)) {
463 spin_unlock(&kvm_vmid_lock);
467 /* First user of a new VMID generation? */
468 if (unlikely(kvm_next_vmid == 0)) {
469 atomic64_inc(&kvm_vmid_gen);
473 * On SMP we know no other CPUs can use this CPU's or each
474 * other's VMID after force_vm_exit returns since the
475 * kvm_vmid_lock blocks them from reentry to the guest.
477 force_vm_exit(cpu_all_mask);
479 * Now broadcast TLB + ICACHE invalidation over the inner
480 * shareable domain to make sure all data structures are
483 kvm_call_hyp(__kvm_flush_vm_context);
486 kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
487 kvm->arch.vmid = kvm_next_vmid;
489 kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
491 /* update vttbr to be used with the new vmid */
492 pgd_phys = virt_to_phys(kvm->arch.pgd);
493 BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
494 vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
495 kvm->arch.vttbr = pgd_phys | vmid;
497 spin_unlock(&kvm_vmid_lock);
500 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
502 struct kvm *kvm = vcpu->kvm;
505 if (likely(vcpu->arch.has_run_once))
508 vcpu->arch.has_run_once = true;
511 * Map the VGIC hardware resources before running a vcpu the first
514 if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
515 ret = kvm_vgic_map_resources(kvm);
521 * Enable the arch timers only if we have an in-kernel VGIC
522 * and it has been properly initialized, since we cannot handle
523 * interrupts from the virtual timer with a userspace gic.
525 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
526 ret = kvm_timer_enable(vcpu);
531 bool kvm_arch_intc_initialized(struct kvm *kvm)
533 return vgic_initialized(kvm);
536 void kvm_arm_halt_guest(struct kvm *kvm)
539 struct kvm_vcpu *vcpu;
541 kvm_for_each_vcpu(i, vcpu, kvm)
542 vcpu->arch.pause = true;
543 kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
546 void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
548 vcpu->arch.pause = true;
552 void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
554 struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
556 vcpu->arch.pause = false;
560 void kvm_arm_resume_guest(struct kvm *kvm)
563 struct kvm_vcpu *vcpu;
565 kvm_for_each_vcpu(i, vcpu, kvm)
566 kvm_arm_resume_vcpu(vcpu);
569 static void vcpu_sleep(struct kvm_vcpu *vcpu)
571 struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
573 swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
574 (!vcpu->arch.pause)));
577 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
579 return vcpu->arch.target >= 0;
583 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
584 * @vcpu: The VCPU pointer
585 * @run: The kvm_run structure pointer used for userspace state exchange
587 * This function is called through the VCPU_RUN ioctl called from user space. It
588 * will execute VM code in a loop until the time slice for the process is used
589 * or some emulation is needed from user space in which case the function will
590 * return with return value 0 and with the kvm_run structure filled in with the
591 * required data for the requested emulation.
593 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
598 if (unlikely(!kvm_vcpu_initialized(vcpu)))
601 ret = kvm_vcpu_first_run_init(vcpu);
605 if (run->exit_reason == KVM_EXIT_MMIO) {
606 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
611 if (run->immediate_exit)
614 if (vcpu->sigset_active)
615 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
618 run->exit_reason = KVM_EXIT_UNKNOWN;
621 * Check conditions before entering the guest
625 update_vttbr(vcpu->kvm);
627 if (vcpu->arch.power_off || vcpu->arch.pause)
631 * Preparing the interrupts to be injected also
632 * involves poking the GIC, which must be done in a
633 * non-preemptible context.
636 kvm_pmu_flush_hwstate(vcpu);
637 kvm_timer_flush_hwstate(vcpu);
638 kvm_vgic_flush_hwstate(vcpu);
643 * Re-check atomic conditions
645 if (signal_pending(current)) {
647 run->exit_reason = KVM_EXIT_INTR;
650 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
651 vcpu->arch.power_off || vcpu->arch.pause) {
653 kvm_pmu_sync_hwstate(vcpu);
654 kvm_timer_sync_hwstate(vcpu);
655 kvm_vgic_sync_hwstate(vcpu);
660 kvm_arm_setup_debug(vcpu);
662 /**************************************************************
665 trace_kvm_entry(*vcpu_pc(vcpu));
666 guest_enter_irqoff();
667 vcpu->mode = IN_GUEST_MODE;
669 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
671 vcpu->mode = OUTSIDE_GUEST_MODE;
675 *************************************************************/
677 kvm_arm_clear_debug(vcpu);
680 * We may have taken a host interrupt in HYP mode (ie
681 * while executing the guest). This interrupt is still
682 * pending, as we haven't serviced it yet!
684 * We're now back in SVC mode, with interrupts
685 * disabled. Enabling the interrupts now will have
686 * the effect of taking the interrupt again, in SVC
692 * We do local_irq_enable() before calling guest_exit() so
693 * that if a timer interrupt hits while running the guest we
694 * account that tick as being spent in the guest. We enable
695 * preemption after calling guest_exit() so that if we get
696 * preempted we make sure ticks after that is not counted as
700 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
703 * We must sync the PMU and timer state before the vgic state so
704 * that the vgic can properly sample the updated state of the
707 kvm_pmu_sync_hwstate(vcpu);
708 kvm_timer_sync_hwstate(vcpu);
710 kvm_vgic_sync_hwstate(vcpu);
714 ret = handle_exit(vcpu, run, ret);
717 if (vcpu->sigset_active)
718 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
722 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
728 if (number == KVM_ARM_IRQ_CPU_IRQ)
729 bit_index = __ffs(HCR_VI);
730 else /* KVM_ARM_IRQ_CPU_FIQ */
731 bit_index = __ffs(HCR_VF);
733 ptr = (unsigned long *)&vcpu->arch.irq_lines;
735 set = test_and_set_bit(bit_index, ptr);
737 set = test_and_clear_bit(bit_index, ptr);
740 * If we didn't change anything, no need to wake up or kick other CPUs
746 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
747 * trigger a world-switch round on the running physical CPU to set the
748 * virtual IRQ/FIQ fields in the HCR appropriately.
755 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
758 u32 irq = irq_level->irq;
759 unsigned int irq_type, vcpu_idx, irq_num;
760 int nrcpus = atomic_read(&kvm->online_vcpus);
761 struct kvm_vcpu *vcpu = NULL;
762 bool level = irq_level->level;
764 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
765 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
766 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
768 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
771 case KVM_ARM_IRQ_TYPE_CPU:
772 if (irqchip_in_kernel(kvm))
775 if (vcpu_idx >= nrcpus)
778 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
782 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
785 return vcpu_interrupt_line(vcpu, irq_num, level);
786 case KVM_ARM_IRQ_TYPE_PPI:
787 if (!irqchip_in_kernel(kvm))
790 if (vcpu_idx >= nrcpus)
793 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
797 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
800 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
801 case KVM_ARM_IRQ_TYPE_SPI:
802 if (!irqchip_in_kernel(kvm))
805 if (irq_num < VGIC_NR_PRIVATE_IRQS)
808 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
814 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
815 const struct kvm_vcpu_init *init)
818 int phys_target = kvm_target_cpu();
820 if (init->target != phys_target)
824 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
825 * use the same target.
827 if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
830 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
831 for (i = 0; i < sizeof(init->features) * 8; i++) {
832 bool set = (init->features[i / 32] & (1 << (i % 32)));
834 if (set && i >= KVM_VCPU_MAX_FEATURES)
838 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
839 * use the same feature set.
841 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
842 test_bit(i, vcpu->arch.features) != set)
846 set_bit(i, vcpu->arch.features);
849 vcpu->arch.target = phys_target;
851 /* Now we know what it is, we can reset it. */
852 return kvm_reset_vcpu(vcpu);
856 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
857 struct kvm_vcpu_init *init)
861 ret = kvm_vcpu_set_target(vcpu, init);
866 * Ensure a rebooted VM will fault in RAM pages and detect if the
867 * guest MMU is turned off and flush the caches as needed.
869 if (vcpu->arch.has_run_once)
870 stage2_unmap_vm(vcpu->kvm);
872 vcpu_reset_hcr(vcpu);
875 * Handle the "start in power-off" case.
877 if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
878 vcpu->arch.power_off = true;
880 vcpu->arch.power_off = false;
885 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
886 struct kvm_device_attr *attr)
890 switch (attr->group) {
892 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
899 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
900 struct kvm_device_attr *attr)
904 switch (attr->group) {
906 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
913 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
914 struct kvm_device_attr *attr)
918 switch (attr->group) {
920 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
927 long kvm_arch_vcpu_ioctl(struct file *filp,
928 unsigned int ioctl, unsigned long arg)
930 struct kvm_vcpu *vcpu = filp->private_data;
931 void __user *argp = (void __user *)arg;
932 struct kvm_device_attr attr;
935 case KVM_ARM_VCPU_INIT: {
936 struct kvm_vcpu_init init;
938 if (copy_from_user(&init, argp, sizeof(init)))
941 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
943 case KVM_SET_ONE_REG:
944 case KVM_GET_ONE_REG: {
945 struct kvm_one_reg reg;
947 if (unlikely(!kvm_vcpu_initialized(vcpu)))
950 if (copy_from_user(®, argp, sizeof(reg)))
952 if (ioctl == KVM_SET_ONE_REG)
953 return kvm_arm_set_reg(vcpu, ®);
955 return kvm_arm_get_reg(vcpu, ®);
957 case KVM_GET_REG_LIST: {
958 struct kvm_reg_list __user *user_list = argp;
959 struct kvm_reg_list reg_list;
962 if (unlikely(!kvm_vcpu_initialized(vcpu)))
965 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
968 reg_list.n = kvm_arm_num_regs(vcpu);
969 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
973 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
975 case KVM_SET_DEVICE_ATTR: {
976 if (copy_from_user(&attr, argp, sizeof(attr)))
978 return kvm_arm_vcpu_set_attr(vcpu, &attr);
980 case KVM_GET_DEVICE_ATTR: {
981 if (copy_from_user(&attr, argp, sizeof(attr)))
983 return kvm_arm_vcpu_get_attr(vcpu, &attr);
985 case KVM_HAS_DEVICE_ATTR: {
986 if (copy_from_user(&attr, argp, sizeof(attr)))
988 return kvm_arm_vcpu_has_attr(vcpu, &attr);
996 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
998 * @log: slot id and address to which we copy the log
1000 * Steps 1-4 below provide general overview of dirty page logging. See
1001 * kvm_get_dirty_log_protect() function description for additional details.
1003 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
1004 * always flush the TLB (step 4) even if previous step failed and the dirty
1005 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
1006 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
1007 * writes will be marked dirty for next log read.
1009 * 1. Take a snapshot of the bit and clear it if needed.
1010 * 2. Write protect the corresponding page.
1011 * 3. Copy the snapshot to the userspace.
1012 * 4. Flush TLB's if needed.
1014 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
1016 bool is_dirty = false;
1019 mutex_lock(&kvm->slots_lock);
1021 r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
1024 kvm_flush_remote_tlbs(kvm);
1026 mutex_unlock(&kvm->slots_lock);
1030 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
1031 struct kvm_arm_device_addr *dev_addr)
1033 unsigned long dev_id, type;
1035 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
1036 KVM_ARM_DEVICE_ID_SHIFT;
1037 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
1038 KVM_ARM_DEVICE_TYPE_SHIFT;
1041 case KVM_ARM_DEVICE_VGIC_V2:
1044 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
1050 long kvm_arch_vm_ioctl(struct file *filp,
1051 unsigned int ioctl, unsigned long arg)
1053 struct kvm *kvm = filp->private_data;
1054 void __user *argp = (void __user *)arg;
1057 case KVM_CREATE_IRQCHIP: {
1061 mutex_lock(&kvm->lock);
1062 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1063 mutex_unlock(&kvm->lock);
1066 case KVM_ARM_SET_DEVICE_ADDR: {
1067 struct kvm_arm_device_addr dev_addr;
1069 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1071 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1073 case KVM_ARM_PREFERRED_TARGET: {
1075 struct kvm_vcpu_init init;
1077 err = kvm_vcpu_preferred_target(&init);
1081 if (copy_to_user(argp, &init, sizeof(init)))
1091 static void cpu_init_hyp_mode(void *dummy)
1093 phys_addr_t pgd_ptr;
1094 unsigned long hyp_stack_ptr;
1095 unsigned long stack_page;
1096 unsigned long vector_ptr;
1098 /* Switch from the HYP stub to our own HYP init vector */
1099 __hyp_set_vectors(kvm_get_idmap_vector());
1101 pgd_ptr = kvm_mmu_get_httbr();
1102 stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1103 hyp_stack_ptr = stack_page + PAGE_SIZE;
1104 vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
1106 __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
1107 __cpu_init_stage2();
1109 if (is_kernel_in_hyp_mode())
1110 kvm_timer_init_vhe();
1112 kvm_arm_init_debug();
1115 static void cpu_hyp_reinit(void)
1117 if (is_kernel_in_hyp_mode()) {
1119 * __cpu_init_stage2() is safe to call even if the PM
1120 * event was cancelled before the CPU was reset.
1122 __cpu_init_stage2();
1124 if (__hyp_get_vectors() == hyp_default_vectors)
1125 cpu_init_hyp_mode(NULL);
1129 static void cpu_hyp_reset(void)
1131 if (!is_kernel_in_hyp_mode())
1132 __cpu_reset_hyp_mode(hyp_default_vectors,
1133 kvm_get_idmap_start());
1136 static void _kvm_arch_hardware_enable(void *discard)
1138 if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1140 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1144 int kvm_arch_hardware_enable(void)
1146 _kvm_arch_hardware_enable(NULL);
1150 static void _kvm_arch_hardware_disable(void *discard)
1152 if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1154 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1158 void kvm_arch_hardware_disable(void)
1160 _kvm_arch_hardware_disable(NULL);
1163 #ifdef CONFIG_CPU_PM
1164 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1169 * kvm_arm_hardware_enabled is left with its old value over
1170 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1175 if (__this_cpu_read(kvm_arm_hardware_enabled))
1177 * don't update kvm_arm_hardware_enabled here
1178 * so that the hardware will be re-enabled
1179 * when we resume. See below.
1185 if (__this_cpu_read(kvm_arm_hardware_enabled))
1186 /* The hardware was enabled before suspend. */
1196 static struct notifier_block hyp_init_cpu_pm_nb = {
1197 .notifier_call = hyp_init_cpu_pm_notifier,
1200 static void __init hyp_cpu_pm_init(void)
1202 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1204 static void __init hyp_cpu_pm_exit(void)
1206 cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1209 static inline void hyp_cpu_pm_init(void)
1212 static inline void hyp_cpu_pm_exit(void)
1217 static void teardown_common_resources(void)
1219 free_percpu(kvm_host_cpu_state);
1222 static int init_common_resources(void)
1224 kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1225 if (!kvm_host_cpu_state) {
1226 kvm_err("Cannot allocate host CPU state\n");
1230 /* set size of VMID supported by CPU */
1231 kvm_vmid_bits = kvm_get_vmid_bits();
1232 kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1237 static int init_subsystems(void)
1242 * Enable hardware so that subsystem initialisation can access EL2.
1244 on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1247 * Register CPU lower-power notifier
1252 * Init HYP view of VGIC
1254 err = kvm_vgic_hyp_init();
1257 vgic_present = true;
1261 vgic_present = false;
1269 * Init HYP architected timer support
1271 err = kvm_timer_hyp_init();
1276 kvm_coproc_table_init();
1279 on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1284 static void teardown_hyp_mode(void)
1288 if (is_kernel_in_hyp_mode())
1292 for_each_possible_cpu(cpu)
1293 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1297 static int init_vhe_mode(void)
1299 kvm_info("VHE mode initialized successfully\n");
1304 * Inits Hyp-mode on all online CPUs
1306 static int init_hyp_mode(void)
1312 * Allocate Hyp PGD and setup Hyp identity mapping
1314 err = kvm_mmu_init();
1319 * It is probably enough to obtain the default on one
1320 * CPU. It's unlikely to be different on the others.
1322 hyp_default_vectors = __hyp_get_vectors();
1325 * Allocate stack pages for Hypervisor-mode
1327 for_each_possible_cpu(cpu) {
1328 unsigned long stack_page;
1330 stack_page = __get_free_page(GFP_KERNEL);
1336 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1340 * Map the Hyp-code called directly from the host
1342 err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1343 kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1345 kvm_err("Cannot map world-switch code\n");
1349 err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1350 kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1352 kvm_err("Cannot map rodata section\n");
1356 err = create_hyp_mappings(kvm_ksym_ref(__bss_start),
1357 kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
1359 kvm_err("Cannot map bss section\n");
1364 * Map the Hyp stack pages
1366 for_each_possible_cpu(cpu) {
1367 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1368 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1372 kvm_err("Cannot map hyp stack\n");
1377 for_each_possible_cpu(cpu) {
1378 kvm_cpu_context_t *cpu_ctxt;
1380 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1381 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
1384 kvm_err("Cannot map host CPU state: %d\n", err);
1389 kvm_info("Hyp mode initialized successfully\n");
1394 teardown_hyp_mode();
1395 kvm_err("error initializing Hyp mode: %d\n", err);
1399 static void check_kvm_target_cpu(void *ret)
1401 *(int *)ret = kvm_target_cpu();
1404 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1406 struct kvm_vcpu *vcpu;
1409 mpidr &= MPIDR_HWID_BITMASK;
1410 kvm_for_each_vcpu(i, vcpu, kvm) {
1411 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1418 * Initialize Hyp-mode and memory mappings on all CPUs.
1420 int kvm_arch_init(void *opaque)
1425 if (!is_hyp_mode_available()) {
1426 kvm_err("HYP mode not available\n");
1430 for_each_online_cpu(cpu) {
1431 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1433 kvm_err("Error, CPU %d not supported!\n", cpu);
1438 err = init_common_resources();
1442 if (is_kernel_in_hyp_mode())
1443 err = init_vhe_mode();
1445 err = init_hyp_mode();
1449 err = init_subsystems();
1456 teardown_hyp_mode();
1458 teardown_common_resources();
1462 /* NOP: Compiling as a module not supported */
1463 void kvm_arch_exit(void)
1465 kvm_perf_teardown();
1468 static int arm_init(void)
1470 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1474 module_init(arm_init);