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 void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
66 BUG_ON(preemptible());
67 __this_cpu_write(kvm_arm_running_vcpu, vcpu);
71 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
72 * Must be called from non-preemptible context
74 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
76 BUG_ON(preemptible());
77 return __this_cpu_read(kvm_arm_running_vcpu);
81 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
83 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
85 return &kvm_arm_running_vcpu;
88 int kvm_arch_hardware_enable(void)
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;
130 /* Mark the initial VMID generation invalid */
131 kvm->arch.vmid_gen = 0;
133 /* The maximum number of VCPUs is limited by the host's GIC model */
134 kvm->arch.max_vcpus = kvm_vgic_get_max_vcpus();
138 kvm_free_stage2_pgd(kvm);
143 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
145 return VM_FAULT_SIGBUS;
150 * kvm_arch_destroy_vm - destroy the VM data structure
151 * @kvm: pointer to the KVM struct
153 void kvm_arch_destroy_vm(struct kvm *kvm)
157 kvm_free_stage2_pgd(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:
174 case KVM_CAP_DEVICE_CTRL:
175 case KVM_CAP_USER_MEMORY:
176 case KVM_CAP_SYNC_MMU:
177 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
178 case KVM_CAP_ONE_REG:
179 case KVM_CAP_ARM_PSCI:
180 case KVM_CAP_ARM_PSCI_0_2:
181 case KVM_CAP_READONLY_MEM:
184 case KVM_CAP_COALESCED_MMIO:
185 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
187 case KVM_CAP_ARM_SET_DEVICE_ADDR:
190 case KVM_CAP_NR_VCPUS:
191 r = num_online_cpus();
193 case KVM_CAP_MAX_VCPUS:
197 r = kvm_arch_dev_ioctl_check_extension(ext);
203 long kvm_arch_dev_ioctl(struct file *filp,
204 unsigned int ioctl, unsigned long arg)
210 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
213 struct kvm_vcpu *vcpu;
215 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
220 if (id >= kvm->arch.max_vcpus) {
225 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
231 err = kvm_vcpu_init(vcpu, kvm, id);
235 err = create_hyp_mappings(vcpu, vcpu + 1);
241 kvm_vcpu_uninit(vcpu);
243 kmem_cache_free(kvm_vcpu_cache, vcpu);
248 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
252 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
254 kvm_mmu_free_memory_caches(vcpu);
255 kvm_timer_vcpu_terminate(vcpu);
256 kvm_vgic_vcpu_destroy(vcpu);
257 kmem_cache_free(kvm_vcpu_cache, vcpu);
260 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
262 kvm_arch_vcpu_free(vcpu);
265 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
270 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
272 /* Force users to call KVM_ARM_VCPU_INIT */
273 vcpu->arch.target = -1;
274 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
276 /* Set up the timer */
277 kvm_timer_vcpu_init(vcpu);
282 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
285 vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
287 kvm_arm_set_running_vcpu(vcpu);
290 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
293 * The arch-generic KVM code expects the cpu field of a vcpu to be -1
294 * if the vcpu is no longer assigned to a cpu. This is used for the
295 * optimized make_all_cpus_request path.
299 kvm_arm_set_running_vcpu(NULL);
302 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
303 struct kvm_guest_debug *dbg)
309 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
310 struct kvm_mp_state *mp_state)
315 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
316 struct kvm_mp_state *mp_state)
322 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
323 * @v: The VCPU pointer
325 * If the guest CPU is not waiting for interrupts or an interrupt line is
326 * asserted, the CPU is by definition runnable.
328 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
330 return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v);
333 /* Just ensure a guest exit from a particular CPU */
334 static void exit_vm_noop(void *info)
338 void force_vm_exit(const cpumask_t *mask)
340 smp_call_function_many(mask, exit_vm_noop, NULL, true);
344 * need_new_vmid_gen - check that the VMID is still valid
345 * @kvm: The VM's VMID to checkt
347 * return true if there is a new generation of VMIDs being used
349 * The hardware supports only 256 values with the value zero reserved for the
350 * host, so we check if an assigned value belongs to a previous generation,
351 * which which requires us to assign a new value. If we're the first to use a
352 * VMID for the new generation, we must flush necessary caches and TLBs on all
355 static bool need_new_vmid_gen(struct kvm *kvm)
357 return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
361 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
362 * @kvm The guest that we are about to run
364 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
365 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
368 static void update_vttbr(struct kvm *kvm)
370 phys_addr_t pgd_phys;
373 if (!need_new_vmid_gen(kvm))
376 spin_lock(&kvm_vmid_lock);
379 * We need to re-check the vmid_gen here to ensure that if another vcpu
380 * already allocated a valid vmid for this vm, then this vcpu should
383 if (!need_new_vmid_gen(kvm)) {
384 spin_unlock(&kvm_vmid_lock);
388 /* First user of a new VMID generation? */
389 if (unlikely(kvm_next_vmid == 0)) {
390 atomic64_inc(&kvm_vmid_gen);
394 * On SMP we know no other CPUs can use this CPU's or each
395 * other's VMID after force_vm_exit returns since the
396 * kvm_vmid_lock blocks them from reentry to the guest.
398 force_vm_exit(cpu_all_mask);
400 * Now broadcast TLB + ICACHE invalidation over the inner
401 * shareable domain to make sure all data structures are
404 kvm_call_hyp(__kvm_flush_vm_context);
407 kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
408 kvm->arch.vmid = kvm_next_vmid;
411 /* update vttbr to be used with the new vmid */
412 pgd_phys = virt_to_phys(kvm_get_hwpgd(kvm));
413 BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
414 vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK;
415 kvm->arch.vttbr = pgd_phys | vmid;
417 spin_unlock(&kvm_vmid_lock);
420 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
422 struct kvm *kvm = vcpu->kvm;
425 if (likely(vcpu->arch.has_run_once))
428 vcpu->arch.has_run_once = true;
431 * Map the VGIC hardware resources before running a vcpu the first
434 if (unlikely(!vgic_ready(kvm))) {
435 ret = kvm_vgic_map_resources(kvm);
441 * Enable the arch timers only if we have an in-kernel VGIC
442 * and it has been properly initialized, since we cannot handle
443 * interrupts from the virtual timer with a userspace gic.
445 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
446 kvm_timer_enable(kvm);
451 static void vcpu_pause(struct kvm_vcpu *vcpu)
453 wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
455 wait_event_interruptible(*wq, !vcpu->arch.pause);
458 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
460 return vcpu->arch.target >= 0;
464 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
465 * @vcpu: The VCPU pointer
466 * @run: The kvm_run structure pointer used for userspace state exchange
468 * This function is called through the VCPU_RUN ioctl called from user space. It
469 * will execute VM code in a loop until the time slice for the process is used
470 * or some emulation is needed from user space in which case the function will
471 * return with return value 0 and with the kvm_run structure filled in with the
472 * required data for the requested emulation.
474 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
479 if (unlikely(!kvm_vcpu_initialized(vcpu)))
482 ret = kvm_vcpu_first_run_init(vcpu);
486 if (run->exit_reason == KVM_EXIT_MMIO) {
487 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
492 if (vcpu->sigset_active)
493 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
496 run->exit_reason = KVM_EXIT_UNKNOWN;
499 * Check conditions before entering the guest
503 update_vttbr(vcpu->kvm);
505 if (vcpu->arch.pause)
508 kvm_vgic_flush_hwstate(vcpu);
509 kvm_timer_flush_hwstate(vcpu);
514 * Re-check atomic conditions
516 if (signal_pending(current)) {
518 run->exit_reason = KVM_EXIT_INTR;
521 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
523 kvm_timer_sync_hwstate(vcpu);
524 kvm_vgic_sync_hwstate(vcpu);
528 /**************************************************************
531 trace_kvm_entry(*vcpu_pc(vcpu));
533 vcpu->mode = IN_GUEST_MODE;
535 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
537 vcpu->mode = OUTSIDE_GUEST_MODE;
539 trace_kvm_exit(kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
541 * We may have taken a host interrupt in HYP mode (ie
542 * while executing the guest). This interrupt is still
543 * pending, as we haven't serviced it yet!
545 * We're now back in SVC mode, with interrupts
546 * disabled. Enabling the interrupts now will have
547 * the effect of taking the interrupt again, in SVC
554 *************************************************************/
556 kvm_timer_sync_hwstate(vcpu);
557 kvm_vgic_sync_hwstate(vcpu);
559 ret = handle_exit(vcpu, run, ret);
562 if (vcpu->sigset_active)
563 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
567 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
573 if (number == KVM_ARM_IRQ_CPU_IRQ)
574 bit_index = __ffs(HCR_VI);
575 else /* KVM_ARM_IRQ_CPU_FIQ */
576 bit_index = __ffs(HCR_VF);
578 ptr = (unsigned long *)&vcpu->arch.irq_lines;
580 set = test_and_set_bit(bit_index, ptr);
582 set = test_and_clear_bit(bit_index, ptr);
585 * If we didn't change anything, no need to wake up or kick other CPUs
591 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
592 * trigger a world-switch round on the running physical CPU to set the
593 * virtual IRQ/FIQ fields in the HCR appropriately.
600 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
603 u32 irq = irq_level->irq;
604 unsigned int irq_type, vcpu_idx, irq_num;
605 int nrcpus = atomic_read(&kvm->online_vcpus);
606 struct kvm_vcpu *vcpu = NULL;
607 bool level = irq_level->level;
609 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
610 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
611 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
613 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
616 case KVM_ARM_IRQ_TYPE_CPU:
617 if (irqchip_in_kernel(kvm))
620 if (vcpu_idx >= nrcpus)
623 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
627 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
630 return vcpu_interrupt_line(vcpu, irq_num, level);
631 case KVM_ARM_IRQ_TYPE_PPI:
632 if (!irqchip_in_kernel(kvm))
635 if (vcpu_idx >= nrcpus)
638 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
642 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
645 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
646 case KVM_ARM_IRQ_TYPE_SPI:
647 if (!irqchip_in_kernel(kvm))
650 if (irq_num < VGIC_NR_PRIVATE_IRQS ||
651 irq_num > KVM_ARM_IRQ_GIC_MAX)
654 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
660 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
661 const struct kvm_vcpu_init *init)
664 int phys_target = kvm_target_cpu();
666 if (init->target != phys_target)
670 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
671 * use the same target.
673 if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
676 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
677 for (i = 0; i < sizeof(init->features) * 8; i++) {
678 bool set = (init->features[i / 32] & (1 << (i % 32)));
680 if (set && i >= KVM_VCPU_MAX_FEATURES)
684 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
685 * use the same feature set.
687 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
688 test_bit(i, vcpu->arch.features) != set)
692 set_bit(i, vcpu->arch.features);
695 vcpu->arch.target = phys_target;
697 /* Now we know what it is, we can reset it. */
698 return kvm_reset_vcpu(vcpu);
702 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
703 struct kvm_vcpu_init *init)
707 ret = kvm_vcpu_set_target(vcpu, init);
712 * Ensure a rebooted VM will fault in RAM pages and detect if the
713 * guest MMU is turned off and flush the caches as needed.
715 if (vcpu->arch.has_run_once)
716 stage2_unmap_vm(vcpu->kvm);
718 vcpu_reset_hcr(vcpu);
721 * Handle the "start in power-off" case by marking the VCPU as paused.
723 if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
724 vcpu->arch.pause = true;
726 vcpu->arch.pause = false;
731 long kvm_arch_vcpu_ioctl(struct file *filp,
732 unsigned int ioctl, unsigned long arg)
734 struct kvm_vcpu *vcpu = filp->private_data;
735 void __user *argp = (void __user *)arg;
738 case KVM_ARM_VCPU_INIT: {
739 struct kvm_vcpu_init init;
741 if (copy_from_user(&init, argp, sizeof(init)))
744 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
746 case KVM_SET_ONE_REG:
747 case KVM_GET_ONE_REG: {
748 struct kvm_one_reg reg;
750 if (unlikely(!kvm_vcpu_initialized(vcpu)))
753 if (copy_from_user(®, argp, sizeof(reg)))
755 if (ioctl == KVM_SET_ONE_REG)
756 return kvm_arm_set_reg(vcpu, ®);
758 return kvm_arm_get_reg(vcpu, ®);
760 case KVM_GET_REG_LIST: {
761 struct kvm_reg_list __user *user_list = argp;
762 struct kvm_reg_list reg_list;
765 if (unlikely(!kvm_vcpu_initialized(vcpu)))
768 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
771 reg_list.n = kvm_arm_num_regs(vcpu);
772 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
776 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
784 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
786 * @log: slot id and address to which we copy the log
788 * Steps 1-4 below provide general overview of dirty page logging. See
789 * kvm_get_dirty_log_protect() function description for additional details.
791 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
792 * always flush the TLB (step 4) even if previous step failed and the dirty
793 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
794 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
795 * writes will be marked dirty for next log read.
797 * 1. Take a snapshot of the bit and clear it if needed.
798 * 2. Write protect the corresponding page.
799 * 3. Copy the snapshot to the userspace.
800 * 4. Flush TLB's if needed.
802 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
804 bool is_dirty = false;
807 mutex_lock(&kvm->slots_lock);
809 r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
812 kvm_flush_remote_tlbs(kvm);
814 mutex_unlock(&kvm->slots_lock);
818 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
819 struct kvm_arm_device_addr *dev_addr)
821 unsigned long dev_id, type;
823 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
824 KVM_ARM_DEVICE_ID_SHIFT;
825 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
826 KVM_ARM_DEVICE_TYPE_SHIFT;
829 case KVM_ARM_DEVICE_VGIC_V2:
830 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
836 long kvm_arch_vm_ioctl(struct file *filp,
837 unsigned int ioctl, unsigned long arg)
839 struct kvm *kvm = filp->private_data;
840 void __user *argp = (void __user *)arg;
843 case KVM_CREATE_IRQCHIP: {
844 return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
846 case KVM_ARM_SET_DEVICE_ADDR: {
847 struct kvm_arm_device_addr dev_addr;
849 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
851 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
853 case KVM_ARM_PREFERRED_TARGET: {
855 struct kvm_vcpu_init init;
857 err = kvm_vcpu_preferred_target(&init);
861 if (copy_to_user(argp, &init, sizeof(init)))
871 static void cpu_init_hyp_mode(void *dummy)
873 phys_addr_t boot_pgd_ptr;
875 unsigned long hyp_stack_ptr;
876 unsigned long stack_page;
877 unsigned long vector_ptr;
879 /* Switch from the HYP stub to our own HYP init vector */
880 __hyp_set_vectors(kvm_get_idmap_vector());
882 boot_pgd_ptr = kvm_mmu_get_boot_httbr();
883 pgd_ptr = kvm_mmu_get_httbr();
884 stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
885 hyp_stack_ptr = stack_page + PAGE_SIZE;
886 vector_ptr = (unsigned long)__kvm_hyp_vector;
888 __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
891 static int hyp_init_cpu_notify(struct notifier_block *self,
892 unsigned long action, void *cpu)
896 case CPU_STARTING_FROZEN:
897 if (__hyp_get_vectors() == hyp_default_vectors)
898 cpu_init_hyp_mode(NULL);
905 static struct notifier_block hyp_init_cpu_nb = {
906 .notifier_call = hyp_init_cpu_notify,
910 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
914 if (cmd == CPU_PM_EXIT &&
915 __hyp_get_vectors() == hyp_default_vectors) {
916 cpu_init_hyp_mode(NULL);
923 static struct notifier_block hyp_init_cpu_pm_nb = {
924 .notifier_call = hyp_init_cpu_pm_notifier,
927 static void __init hyp_cpu_pm_init(void)
929 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
932 static inline void hyp_cpu_pm_init(void)
938 * Inits Hyp-mode on all online CPUs
940 static int init_hyp_mode(void)
946 * Allocate Hyp PGD and setup Hyp identity mapping
948 err = kvm_mmu_init();
953 * It is probably enough to obtain the default on one
954 * CPU. It's unlikely to be different on the others.
956 hyp_default_vectors = __hyp_get_vectors();
959 * Allocate stack pages for Hypervisor-mode
961 for_each_possible_cpu(cpu) {
962 unsigned long stack_page;
964 stack_page = __get_free_page(GFP_KERNEL);
967 goto out_free_stack_pages;
970 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
974 * Map the Hyp-code called directly from the host
976 err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end);
978 kvm_err("Cannot map world-switch code\n");
979 goto out_free_mappings;
983 * Map the Hyp stack pages
985 for_each_possible_cpu(cpu) {
986 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
987 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
990 kvm_err("Cannot map hyp stack\n");
991 goto out_free_mappings;
996 * Map the host CPU structures
998 kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
999 if (!kvm_host_cpu_state) {
1001 kvm_err("Cannot allocate host CPU state\n");
1002 goto out_free_mappings;
1005 for_each_possible_cpu(cpu) {
1006 kvm_cpu_context_t *cpu_ctxt;
1008 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1009 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
1012 kvm_err("Cannot map host CPU state: %d\n", err);
1013 goto out_free_context;
1018 * Execute the init code on each CPU.
1020 on_each_cpu(cpu_init_hyp_mode, NULL, 1);
1023 * Init HYP view of VGIC
1025 err = kvm_vgic_hyp_init();
1027 goto out_free_context;
1030 * Init HYP architected timer support
1032 err = kvm_timer_hyp_init();
1034 goto out_free_mappings;
1036 #ifndef CONFIG_HOTPLUG_CPU
1037 free_boot_hyp_pgd();
1042 kvm_info("Hyp mode initialized successfully\n");
1046 free_percpu(kvm_host_cpu_state);
1049 out_free_stack_pages:
1050 for_each_possible_cpu(cpu)
1051 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1053 kvm_err("error initializing Hyp mode: %d\n", err);
1057 static void check_kvm_target_cpu(void *ret)
1059 *(int *)ret = kvm_target_cpu();
1062 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1064 struct kvm_vcpu *vcpu;
1067 mpidr &= MPIDR_HWID_BITMASK;
1068 kvm_for_each_vcpu(i, vcpu, kvm) {
1069 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1076 * Initialize Hyp-mode and memory mappings on all CPUs.
1078 int kvm_arch_init(void *opaque)
1083 if (!is_hyp_mode_available()) {
1084 kvm_err("HYP mode not available\n");
1088 for_each_online_cpu(cpu) {
1089 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1091 kvm_err("Error, CPU %d not supported!\n", cpu);
1096 cpu_notifier_register_begin();
1098 err = init_hyp_mode();
1102 err = __register_cpu_notifier(&hyp_init_cpu_nb);
1104 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
1108 cpu_notifier_register_done();
1112 kvm_coproc_table_init();
1115 cpu_notifier_register_done();
1119 /* NOP: Compiling as a module not supported */
1120 void kvm_arch_exit(void)
1122 kvm_perf_teardown();
1125 static int arm_init(void)
1127 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1131 module_init(arm_init);