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.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>
27 #include <linux/mman.h>
28 #include <linux/sched.h>
29 #include <linux/kvm.h>
30 #include <trace/events/kvm.h>
32 #define CREATE_TRACE_POINTS
35 #include <asm/uaccess.h>
36 #include <asm/ptrace.h>
38 #include <asm/tlbflush.h>
39 #include <asm/cacheflush.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>
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 u8 kvm_next_vmid;
62 static DEFINE_SPINLOCK(kvm_vmid_lock);
64 static bool vgic_present;
66 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
68 BUG_ON(preemptible());
69 __this_cpu_write(kvm_arm_running_vcpu, vcpu);
73 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
74 * Must be called from non-preemptible context
76 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
78 BUG_ON(preemptible());
79 return __this_cpu_read(kvm_arm_running_vcpu);
83 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
85 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
87 return &kvm_arm_running_vcpu;
90 int kvm_arch_hardware_enable(void)
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 ret = kvm_alloc_stage2_pgd(kvm);
126 ret = create_hyp_mappings(kvm, kvm + 1);
128 goto out_free_stage2_pgd;
132 /* Mark the initial VMID generation invalid */
133 kvm->arch.vmid_gen = 0;
137 kvm_free_stage2_pgd(kvm);
142 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
144 return VM_FAULT_SIGBUS;
149 * kvm_arch_destroy_vm - destroy the VM data structure
150 * @kvm: pointer to the KVM struct
152 void kvm_arch_destroy_vm(struct kvm *kvm)
156 kvm_free_stage2_pgd(kvm);
158 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
160 kvm_arch_vcpu_free(kvm->vcpus[i]);
161 kvm->vcpus[i] = NULL;
165 kvm_vgic_destroy(kvm);
168 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
172 case KVM_CAP_IRQCHIP:
175 case KVM_CAP_DEVICE_CTRL:
176 case KVM_CAP_USER_MEMORY:
177 case KVM_CAP_SYNC_MMU:
178 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
179 case KVM_CAP_ONE_REG:
180 case KVM_CAP_ARM_PSCI:
181 case KVM_CAP_ARM_PSCI_0_2:
182 case KVM_CAP_READONLY_MEM:
185 case KVM_CAP_COALESCED_MMIO:
186 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
188 case KVM_CAP_ARM_SET_DEVICE_ADDR:
191 case KVM_CAP_NR_VCPUS:
192 r = num_online_cpus();
194 case KVM_CAP_MAX_VCPUS:
198 r = kvm_arch_dev_ioctl_check_extension(ext);
204 long kvm_arch_dev_ioctl(struct file *filp,
205 unsigned int ioctl, unsigned long arg)
211 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
214 struct kvm_vcpu *vcpu;
216 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
221 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
227 err = kvm_vcpu_init(vcpu, kvm, id);
231 err = create_hyp_mappings(vcpu, vcpu + 1);
237 kvm_vcpu_uninit(vcpu);
239 kmem_cache_free(kvm_vcpu_cache, vcpu);
244 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
249 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
251 kvm_mmu_free_memory_caches(vcpu);
252 kvm_timer_vcpu_terminate(vcpu);
253 kvm_vgic_vcpu_destroy(vcpu);
254 kmem_cache_free(kvm_vcpu_cache, vcpu);
257 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
259 kvm_arch_vcpu_free(vcpu);
262 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
267 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
269 /* Force users to call KVM_ARM_VCPU_INIT */
270 vcpu->arch.target = -1;
271 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
273 /* Set up the timer */
274 kvm_timer_vcpu_init(vcpu);
279 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
282 vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
285 * Check whether this vcpu requires the cache to be flushed on
286 * this physical CPU. This is a consequence of doing dcache
287 * operations by set/way on this vcpu. We do it here to be in
288 * a non-preemptible section.
290 if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush))
291 flush_cache_all(); /* We'd really want v7_flush_dcache_all() */
293 kvm_arm_set_running_vcpu(vcpu);
296 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
299 * The arch-generic KVM code expects the cpu field of a vcpu to be -1
300 * if the vcpu is no longer assigned to a cpu. This is used for the
301 * optimized make_all_cpus_request path.
305 kvm_arm_set_running_vcpu(NULL);
308 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
309 struct kvm_guest_debug *dbg)
315 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
316 struct kvm_mp_state *mp_state)
321 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
322 struct kvm_mp_state *mp_state)
328 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
329 * @v: The VCPU pointer
331 * If the guest CPU is not waiting for interrupts or an interrupt line is
332 * asserted, the CPU is by definition runnable.
334 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
336 return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v);
339 /* Just ensure a guest exit from a particular CPU */
340 static void exit_vm_noop(void *info)
344 void force_vm_exit(const cpumask_t *mask)
346 smp_call_function_many(mask, exit_vm_noop, NULL, true);
350 * need_new_vmid_gen - check that the VMID is still valid
351 * @kvm: The VM's VMID to checkt
353 * return true if there is a new generation of VMIDs being used
355 * The hardware supports only 256 values with the value zero reserved for the
356 * host, so we check if an assigned value belongs to a previous generation,
357 * which which requires us to assign a new value. If we're the first to use a
358 * VMID for the new generation, we must flush necessary caches and TLBs on all
361 static bool need_new_vmid_gen(struct kvm *kvm)
363 return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
367 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
368 * @kvm The guest that we are about to run
370 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
371 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
374 static void update_vttbr(struct kvm *kvm)
376 phys_addr_t pgd_phys;
379 if (!need_new_vmid_gen(kvm))
382 spin_lock(&kvm_vmid_lock);
385 * We need to re-check the vmid_gen here to ensure that if another vcpu
386 * already allocated a valid vmid for this vm, then this vcpu should
389 if (!need_new_vmid_gen(kvm)) {
390 spin_unlock(&kvm_vmid_lock);
394 /* First user of a new VMID generation? */
395 if (unlikely(kvm_next_vmid == 0)) {
396 atomic64_inc(&kvm_vmid_gen);
400 * On SMP we know no other CPUs can use this CPU's or each
401 * other's VMID after force_vm_exit returns since the
402 * kvm_vmid_lock blocks them from reentry to the guest.
404 force_vm_exit(cpu_all_mask);
406 * Now broadcast TLB + ICACHE invalidation over the inner
407 * shareable domain to make sure all data structures are
410 kvm_call_hyp(__kvm_flush_vm_context);
413 kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
414 kvm->arch.vmid = kvm_next_vmid;
417 /* update vttbr to be used with the new vmid */
418 pgd_phys = virt_to_phys(kvm_get_hwpgd(kvm));
419 BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
420 vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK;
421 kvm->arch.vttbr = pgd_phys | vmid;
423 spin_unlock(&kvm_vmid_lock);
426 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
428 struct kvm *kvm = vcpu->kvm;
431 if (likely(vcpu->arch.has_run_once))
434 vcpu->arch.has_run_once = true;
437 * Map the VGIC hardware resources before running a vcpu the first
440 if (unlikely(!vgic_ready(kvm))) {
441 ret = kvm_vgic_map_resources(kvm);
447 * Enable the arch timers only if we have an in-kernel VGIC
448 * and it has been properly initialized, since we cannot handle
449 * interrupts from the virtual timer with a userspace gic.
451 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
452 kvm_timer_enable(kvm);
457 static void vcpu_pause(struct kvm_vcpu *vcpu)
459 wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
461 wait_event_interruptible(*wq, !vcpu->arch.pause);
464 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
466 return vcpu->arch.target >= 0;
470 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
471 * @vcpu: The VCPU pointer
472 * @run: The kvm_run structure pointer used for userspace state exchange
474 * This function is called through the VCPU_RUN ioctl called from user space. It
475 * will execute VM code in a loop until the time slice for the process is used
476 * or some emulation is needed from user space in which case the function will
477 * return with return value 0 and with the kvm_run structure filled in with the
478 * required data for the requested emulation.
480 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
485 if (unlikely(!kvm_vcpu_initialized(vcpu)))
488 ret = kvm_vcpu_first_run_init(vcpu);
492 if (run->exit_reason == KVM_EXIT_MMIO) {
493 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
498 if (vcpu->sigset_active)
499 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
502 run->exit_reason = KVM_EXIT_UNKNOWN;
505 * Check conditions before entering the guest
509 update_vttbr(vcpu->kvm);
511 if (vcpu->arch.pause)
514 kvm_vgic_flush_hwstate(vcpu);
515 kvm_timer_flush_hwstate(vcpu);
520 * Re-check atomic conditions
522 if (signal_pending(current)) {
524 run->exit_reason = KVM_EXIT_INTR;
527 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
529 kvm_timer_sync_hwstate(vcpu);
530 kvm_vgic_sync_hwstate(vcpu);
534 /**************************************************************
537 trace_kvm_entry(*vcpu_pc(vcpu));
539 vcpu->mode = IN_GUEST_MODE;
541 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
543 vcpu->mode = OUTSIDE_GUEST_MODE;
544 vcpu->arch.last_pcpu = smp_processor_id();
546 trace_kvm_exit(*vcpu_pc(vcpu));
548 * We may have taken a host interrupt in HYP mode (ie
549 * while executing the guest). This interrupt is still
550 * pending, as we haven't serviced it yet!
552 * We're now back in SVC mode, with interrupts
553 * disabled. Enabling the interrupts now will have
554 * the effect of taking the interrupt again, in SVC
561 *************************************************************/
563 kvm_timer_sync_hwstate(vcpu);
564 kvm_vgic_sync_hwstate(vcpu);
566 ret = handle_exit(vcpu, run, ret);
569 if (vcpu->sigset_active)
570 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
574 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
580 if (number == KVM_ARM_IRQ_CPU_IRQ)
581 bit_index = __ffs(HCR_VI);
582 else /* KVM_ARM_IRQ_CPU_FIQ */
583 bit_index = __ffs(HCR_VF);
585 ptr = (unsigned long *)&vcpu->arch.irq_lines;
587 set = test_and_set_bit(bit_index, ptr);
589 set = test_and_clear_bit(bit_index, ptr);
592 * If we didn't change anything, no need to wake up or kick other CPUs
598 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
599 * trigger a world-switch round on the running physical CPU to set the
600 * virtual IRQ/FIQ fields in the HCR appropriately.
607 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
610 u32 irq = irq_level->irq;
611 unsigned int irq_type, vcpu_idx, irq_num;
612 int nrcpus = atomic_read(&kvm->online_vcpus);
613 struct kvm_vcpu *vcpu = NULL;
614 bool level = irq_level->level;
616 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
617 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
618 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
620 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
623 case KVM_ARM_IRQ_TYPE_CPU:
624 if (irqchip_in_kernel(kvm))
627 if (vcpu_idx >= nrcpus)
630 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
634 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
637 return vcpu_interrupt_line(vcpu, irq_num, level);
638 case KVM_ARM_IRQ_TYPE_PPI:
639 if (!irqchip_in_kernel(kvm))
642 if (vcpu_idx >= nrcpus)
645 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
649 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
652 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
653 case KVM_ARM_IRQ_TYPE_SPI:
654 if (!irqchip_in_kernel(kvm))
657 if (irq_num < VGIC_NR_PRIVATE_IRQS ||
658 irq_num > KVM_ARM_IRQ_GIC_MAX)
661 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
667 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
668 const struct kvm_vcpu_init *init)
671 int phys_target = kvm_target_cpu();
673 if (init->target != phys_target)
677 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
678 * use the same target.
680 if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
683 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
684 for (i = 0; i < sizeof(init->features) * 8; i++) {
685 bool set = (init->features[i / 32] & (1 << (i % 32)));
687 if (set && i >= KVM_VCPU_MAX_FEATURES)
691 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
692 * use the same feature set.
694 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
695 test_bit(i, vcpu->arch.features) != set)
699 set_bit(i, vcpu->arch.features);
702 vcpu->arch.target = phys_target;
704 /* Now we know what it is, we can reset it. */
705 return kvm_reset_vcpu(vcpu);
709 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
710 struct kvm_vcpu_init *init)
714 ret = kvm_vcpu_set_target(vcpu, init);
719 * Ensure a rebooted VM will fault in RAM pages and detect if the
720 * guest MMU is turned off and flush the caches as needed.
722 if (vcpu->arch.has_run_once)
723 stage2_unmap_vm(vcpu->kvm);
725 vcpu_reset_hcr(vcpu);
728 * Handle the "start in power-off" case by marking the VCPU as paused.
730 if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
731 vcpu->arch.pause = true;
733 vcpu->arch.pause = false;
738 long kvm_arch_vcpu_ioctl(struct file *filp,
739 unsigned int ioctl, unsigned long arg)
741 struct kvm_vcpu *vcpu = filp->private_data;
742 void __user *argp = (void __user *)arg;
745 case KVM_ARM_VCPU_INIT: {
746 struct kvm_vcpu_init init;
748 if (copy_from_user(&init, argp, sizeof(init)))
751 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
753 case KVM_SET_ONE_REG:
754 case KVM_GET_ONE_REG: {
755 struct kvm_one_reg reg;
757 if (unlikely(!kvm_vcpu_initialized(vcpu)))
760 if (copy_from_user(®, argp, sizeof(reg)))
762 if (ioctl == KVM_SET_ONE_REG)
763 return kvm_arm_set_reg(vcpu, ®);
765 return kvm_arm_get_reg(vcpu, ®);
767 case KVM_GET_REG_LIST: {
768 struct kvm_reg_list __user *user_list = argp;
769 struct kvm_reg_list reg_list;
772 if (unlikely(!kvm_vcpu_initialized(vcpu)))
775 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
778 reg_list.n = kvm_arm_num_regs(vcpu);
779 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
783 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
790 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
795 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
796 struct kvm_arm_device_addr *dev_addr)
798 unsigned long dev_id, type;
800 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
801 KVM_ARM_DEVICE_ID_SHIFT;
802 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
803 KVM_ARM_DEVICE_TYPE_SHIFT;
806 case KVM_ARM_DEVICE_VGIC_V2:
809 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
815 long kvm_arch_vm_ioctl(struct file *filp,
816 unsigned int ioctl, unsigned long arg)
818 struct kvm *kvm = filp->private_data;
819 void __user *argp = (void __user *)arg;
822 case KVM_CREATE_IRQCHIP: {
824 return kvm_vgic_create(kvm);
828 case KVM_ARM_SET_DEVICE_ADDR: {
829 struct kvm_arm_device_addr dev_addr;
831 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
833 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
835 case KVM_ARM_PREFERRED_TARGET: {
837 struct kvm_vcpu_init init;
839 err = kvm_vcpu_preferred_target(&init);
843 if (copy_to_user(argp, &init, sizeof(init)))
853 static void cpu_init_hyp_mode(void *dummy)
855 phys_addr_t boot_pgd_ptr;
857 unsigned long hyp_stack_ptr;
858 unsigned long stack_page;
859 unsigned long vector_ptr;
861 /* Switch from the HYP stub to our own HYP init vector */
862 __hyp_set_vectors(kvm_get_idmap_vector());
864 boot_pgd_ptr = kvm_mmu_get_boot_httbr();
865 pgd_ptr = kvm_mmu_get_httbr();
866 stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
867 hyp_stack_ptr = stack_page + PAGE_SIZE;
868 vector_ptr = (unsigned long)__kvm_hyp_vector;
870 __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
873 static int hyp_init_cpu_notify(struct notifier_block *self,
874 unsigned long action, void *cpu)
878 case CPU_STARTING_FROZEN:
879 if (__hyp_get_vectors() == hyp_default_vectors)
880 cpu_init_hyp_mode(NULL);
887 static struct notifier_block hyp_init_cpu_nb = {
888 .notifier_call = hyp_init_cpu_notify,
892 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
896 if (cmd == CPU_PM_EXIT &&
897 __hyp_get_vectors() == hyp_default_vectors) {
898 cpu_init_hyp_mode(NULL);
905 static struct notifier_block hyp_init_cpu_pm_nb = {
906 .notifier_call = hyp_init_cpu_pm_notifier,
909 static void __init hyp_cpu_pm_init(void)
911 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
914 static inline void hyp_cpu_pm_init(void)
920 * Inits Hyp-mode on all online CPUs
922 static int init_hyp_mode(void)
928 * Allocate Hyp PGD and setup Hyp identity mapping
930 err = kvm_mmu_init();
935 * It is probably enough to obtain the default on one
936 * CPU. It's unlikely to be different on the others.
938 hyp_default_vectors = __hyp_get_vectors();
941 * Allocate stack pages for Hypervisor-mode
943 for_each_possible_cpu(cpu) {
944 unsigned long stack_page;
946 stack_page = __get_free_page(GFP_KERNEL);
949 goto out_free_stack_pages;
952 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
956 * Map the Hyp-code called directly from the host
958 err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end);
960 kvm_err("Cannot map world-switch code\n");
961 goto out_free_mappings;
965 * Map the Hyp stack pages
967 for_each_possible_cpu(cpu) {
968 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
969 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
972 kvm_err("Cannot map hyp stack\n");
973 goto out_free_mappings;
978 * Map the host CPU structures
980 kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
981 if (!kvm_host_cpu_state) {
983 kvm_err("Cannot allocate host CPU state\n");
984 goto out_free_mappings;
987 for_each_possible_cpu(cpu) {
988 kvm_cpu_context_t *cpu_ctxt;
990 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
991 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
994 kvm_err("Cannot map host CPU state: %d\n", err);
995 goto out_free_context;
1000 * Execute the init code on each CPU.
1002 on_each_cpu(cpu_init_hyp_mode, NULL, 1);
1005 * Init HYP view of VGIC
1007 err = kvm_vgic_hyp_init();
1009 goto out_free_context;
1011 #ifdef CONFIG_KVM_ARM_VGIC
1012 vgic_present = true;
1016 * Init HYP architected timer support
1018 err = kvm_timer_hyp_init();
1020 goto out_free_mappings;
1022 #ifndef CONFIG_HOTPLUG_CPU
1023 free_boot_hyp_pgd();
1028 kvm_info("Hyp mode initialized successfully\n");
1032 free_percpu(kvm_host_cpu_state);
1035 out_free_stack_pages:
1036 for_each_possible_cpu(cpu)
1037 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1039 kvm_err("error initializing Hyp mode: %d\n", err);
1043 static void check_kvm_target_cpu(void *ret)
1045 *(int *)ret = kvm_target_cpu();
1049 * Initialize Hyp-mode and memory mappings on all CPUs.
1051 int kvm_arch_init(void *opaque)
1056 if (!is_hyp_mode_available()) {
1057 kvm_err("HYP mode not available\n");
1061 for_each_online_cpu(cpu) {
1062 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1064 kvm_err("Error, CPU %d not supported!\n", cpu);
1069 cpu_notifier_register_begin();
1071 err = init_hyp_mode();
1075 err = __register_cpu_notifier(&hyp_init_cpu_nb);
1077 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
1081 cpu_notifier_register_done();
1085 kvm_coproc_table_init();
1088 cpu_notifier_register_done();
1092 /* NOP: Compiling as a module not supported */
1093 void kvm_arch_exit(void)
1095 kvm_perf_teardown();
1098 static int arm_init(void)
1100 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1104 module_init(arm_init);