Merge tag 'kvm-arm-for-v4.12-round2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

Second round of KVM/ARM Changes for v4.12.

Changes include:
 - A fix related to the 32-bit idmap stub
 - A fix to the bitmask used to deode the operands of an AArch32 CP
   instruction
 - We have moved the files shared between arch/arm/kvm and
   arch/arm64/kvm to virt/kvm/arm
 - We add support for saving/restoring the virtual ITS state to
   userspace

1 files changed, 1480 insertions, 0 deletions

diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
new file mode 100644
index 000000000000..3417e184c8e1
--- /dev/null
+++ b/virt/kvm/arm/arm.c
@@ -0,0 +1,1480 @@
+/*
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/cpu_pm.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kvm_host.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/mman.h>
+#include <linux/sched.h>
+#include <linux/kvm.h>
+#include <trace/events/kvm.h>
+#include <kvm/arm_pmu.h>
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
+#include <linux/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/mman.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/virt.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_coproc.h>
+#include <asm/kvm_psci.h>
+#include <asm/sections.h>
+
+#ifdef REQUIRES_VIRT
+__asm__(".arch_extension	virt");
+#endif
+
+static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
+static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
+
+/* Per-CPU variable containing the currently running vcpu. */
+static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
+
+/* The VMID used in the VTTBR */
+static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
+static u32 kvm_next_vmid;
+static unsigned int kvm_vmid_bits __read_mostly;
+static DEFINE_SPINLOCK(kvm_vmid_lock);
+
+static bool vgic_present;
+
+static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
+
+static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
+{
+	BUG_ON(preemptible());
+	__this_cpu_write(kvm_arm_running_vcpu, vcpu);
+}
+
+/**
+ * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
+ * Must be called from non-preemptible context
+ */
+struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
+{
+	BUG_ON(preemptible());
+	return __this_cpu_read(kvm_arm_running_vcpu);
+}
+
+/**
+ * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
+ */
+struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
+{
+	return &kvm_arm_running_vcpu;
+}
+
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+{
+	return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
+}
+
+int kvm_arch_hardware_setup(void)
+{
+	return 0;
+}
+
+void kvm_arch_check_processor_compat(void *rtn)
+{
+	*(int *)rtn = 0;
+}
+
+
+/**
+ * kvm_arch_init_vm - initializes a VM data structure
+ * @kvm:	pointer to the KVM struct
+ */
+int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
+{
+	int ret, cpu;
+
+	if (type)
+		return -EINVAL;
+
+	kvm->arch.last_vcpu_ran = alloc_percpu(typeof(*kvm->arch.last_vcpu_ran));
+	if (!kvm->arch.last_vcpu_ran)
+		return -ENOMEM;
+
+	for_each_possible_cpu(cpu)
+		*per_cpu_ptr(kvm->arch.last_vcpu_ran, cpu) = -1;
+
+	ret = kvm_alloc_stage2_pgd(kvm);
+	if (ret)
+		goto out_fail_alloc;
+
+	ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
+	if (ret)
+		goto out_free_stage2_pgd;
+
+	kvm_vgic_early_init(kvm);
+
+	/* Mark the initial VMID generation invalid */
+	kvm->arch.vmid_gen = 0;
+
+	/* The maximum number of VCPUs is limited by the host's GIC model */
+	kvm->arch.max_vcpus = vgic_present ?
+				kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
+
+	return ret;
+out_free_stage2_pgd:
+	kvm_free_stage2_pgd(kvm);
+out_fail_alloc:
+	free_percpu(kvm->arch.last_vcpu_ran);
+	kvm->arch.last_vcpu_ran = NULL;
+	return ret;
+}
+
+bool kvm_arch_has_vcpu_debugfs(void)
+{
+	return false;
+}
+
+int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
+{
+	return 0;
+}
+
+int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+{
+	return VM_FAULT_SIGBUS;
+}
+
+
+/**
+ * kvm_arch_destroy_vm - destroy the VM data structure
+ * @kvm:	pointer to the KVM struct
+ */
+void kvm_arch_destroy_vm(struct kvm *kvm)
+{
+	int i;
+
+	free_percpu(kvm->arch.last_vcpu_ran);
+	kvm->arch.last_vcpu_ran = NULL;
+
+	for (i = 0; i < KVM_MAX_VCPUS; ++i) {
+		if (kvm->vcpus[i]) {
+			kvm_arch_vcpu_free(kvm->vcpus[i]);
+			kvm->vcpus[i] = NULL;
+		}
+	}
+
+	kvm_vgic_destroy(kvm);
+}
+
+int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
+{
+	int r;
+	switch (ext) {
+	case KVM_CAP_IRQCHIP:
+		r = vgic_present;
+		break;
+	case KVM_CAP_IOEVENTFD:
+	case KVM_CAP_DEVICE_CTRL:
+	case KVM_CAP_USER_MEMORY:
+	case KVM_CAP_SYNC_MMU:
+	case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
+	case KVM_CAP_ONE_REG:
+	case KVM_CAP_ARM_PSCI:
+	case KVM_CAP_ARM_PSCI_0_2:
+	case KVM_CAP_READONLY_MEM:
+	case KVM_CAP_MP_STATE:
+	case KVM_CAP_IMMEDIATE_EXIT:
+		r = 1;
+		break;
+	case KVM_CAP_ARM_SET_DEVICE_ADDR:
+		r = 1;
+		break;
+	case KVM_CAP_NR_VCPUS:
+		r = num_online_cpus();
+		break;
+	case KVM_CAP_MAX_VCPUS:
+		r = KVM_MAX_VCPUS;
+		break;
+	case KVM_CAP_NR_MEMSLOTS:
+		r = KVM_USER_MEM_SLOTS;
+		break;
+	case KVM_CAP_MSI_DEVID:
+		if (!kvm)
+			r = -EINVAL;
+		else
+			r = kvm->arch.vgic.msis_require_devid;
+		break;
+	case KVM_CAP_ARM_USER_IRQ:
+		/*
+		 * 1: EL1_VTIMER, EL1_PTIMER, and PMU.
+		 * (bump this number if adding more devices)
+		 */
+		r = 1;
+		break;
+	default:
+		r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
+		break;
+	}
+	return r;
+}
+
+long kvm_arch_dev_ioctl(struct file *filp,
+			unsigned int ioctl, unsigned long arg)
+{
+	return -EINVAL;
+}
+
+
+struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
+{
+	int err;
+	struct kvm_vcpu *vcpu;
+
+	if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
+		err = -EBUSY;
+		goto out;
+	}
+
+	if (id >= kvm->arch.max_vcpus) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
+	if (!vcpu) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	err = kvm_vcpu_init(vcpu, kvm, id);
+	if (err)
+		goto free_vcpu;
+
+	err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
+	if (err)
+		goto vcpu_uninit;
+
+	return vcpu;
+vcpu_uninit:
+	kvm_vcpu_uninit(vcpu);
+free_vcpu:
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
+out:
+	return ERR_PTR(err);
+}
+
+void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
+{
+	kvm_vgic_vcpu_early_init(vcpu);
+}
+
+void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
+{
+	kvm_mmu_free_memory_caches(vcpu);
+	kvm_timer_vcpu_terminate(vcpu);
+	kvm_vgic_vcpu_destroy(vcpu);
+	kvm_pmu_vcpu_destroy(vcpu);
+	kvm_vcpu_uninit(vcpu);
+	kmem_cache_free(kvm_vcpu_cache, vcpu);
+}
+
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+	kvm_arch_vcpu_free(vcpu);
+}
+
+int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+{
+	return kvm_timer_should_fire(vcpu_vtimer(vcpu)) ||
+	       kvm_timer_should_fire(vcpu_ptimer(vcpu));
+}
+
+void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
+{
+	kvm_timer_schedule(vcpu);
+}
+
+void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
+{
+	kvm_timer_unschedule(vcpu);
+}
+
+int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
+{
+	/* Force users to call KVM_ARM_VCPU_INIT */
+	vcpu->arch.target = -1;
+	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
+
+	/* Set up the timer */
+	kvm_timer_vcpu_init(vcpu);
+
+	kvm_arm_reset_debug_ptr(vcpu);
+
+	return kvm_vgic_vcpu_init(vcpu);
+}
+
+void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+	int *last_ran;
+
+	last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran);
+
+	/*
+	 * We might get preempted before the vCPU actually runs, but
+	 * over-invalidation doesn't affect correctness.
+	 */
+	if (*last_ran != vcpu->vcpu_id) {
+		kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu);
+		*last_ran = vcpu->vcpu_id;
+	}
+
+	vcpu->cpu = cpu;
+	vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
+
+	kvm_arm_set_running_vcpu(vcpu);
+
+	kvm_vgic_load(vcpu);
+}
+
+void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+{
+	kvm_vgic_put(vcpu);
+
+	vcpu->cpu = -1;
+
+	kvm_arm_set_running_vcpu(NULL);
+	kvm_timer_vcpu_put(vcpu);
+}
+
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+				    struct kvm_mp_state *mp_state)
+{
+	if (vcpu->arch.power_off)
+		mp_state->mp_state = KVM_MP_STATE_STOPPED;
+	else
+		mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
+
+	return 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+				    struct kvm_mp_state *mp_state)
+{
+	switch (mp_state->mp_state) {
+	case KVM_MP_STATE_RUNNABLE:
+		vcpu->arch.power_off = false;
+		break;
+	case KVM_MP_STATE_STOPPED:
+		vcpu->arch.power_off = true;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
+ * @v:		The VCPU pointer
+ *
+ * If the guest CPU is not waiting for interrupts or an interrupt line is
+ * asserted, the CPU is by definition runnable.
+ */
+int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
+{
+	return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
+		&& !v->arch.power_off && !v->arch.pause);
+}
+
+/* Just ensure a guest exit from a particular CPU */
+static void exit_vm_noop(void *info)
+{
+}
+
+void force_vm_exit(const cpumask_t *mask)
+{
+	preempt_disable();
+	smp_call_function_many(mask, exit_vm_noop, NULL, true);
+	preempt_enable();
+}
+
+/**
+ * need_new_vmid_gen - check that the VMID is still valid
+ * @kvm: The VM's VMID to check
+ *
+ * return true if there is a new generation of VMIDs being used
+ *
+ * The hardware supports only 256 values with the value zero reserved for the
+ * host, so we check if an assigned value belongs to a previous generation,
+ * which which requires us to assign a new value. If we're the first to use a
+ * VMID for the new generation, we must flush necessary caches and TLBs on all
+ * CPUs.
+ */
+static bool need_new_vmid_gen(struct kvm *kvm)
+{
+	return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
+}
+
+/**
+ * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
+ * @kvm	The guest that we are about to run
+ *
+ * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
+ * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
+ * caches and TLBs.
+ */
+static void update_vttbr(struct kvm *kvm)
+{
+	phys_addr_t pgd_phys;
+	u64 vmid;
+
+	if (!need_new_vmid_gen(kvm))
+		return;
+
+	spin_lock(&kvm_vmid_lock);
+
+	/*
+	 * We need to re-check the vmid_gen here to ensure that if another vcpu
+	 * already allocated a valid vmid for this vm, then this vcpu should
+	 * use the same vmid.
+	 */
+	if (!need_new_vmid_gen(kvm)) {
+		spin_unlock(&kvm_vmid_lock);
+		return;
+	}
+
+	/* First user of a new VMID generation? */
+	if (unlikely(kvm_next_vmid == 0)) {
+		atomic64_inc(&kvm_vmid_gen);
+		kvm_next_vmid = 1;
+
+		/*
+		 * On SMP we know no other CPUs can use this CPU's or each
+		 * other's VMID after force_vm_exit returns since the
+		 * kvm_vmid_lock blocks them from reentry to the guest.
+		 */
+		force_vm_exit(cpu_all_mask);
+		/*
+		 * Now broadcast TLB + ICACHE invalidation over the inner
+		 * shareable domain to make sure all data structures are
+		 * clean.
+		 */
+		kvm_call_hyp(__kvm_flush_vm_context);
+	}
+
+	kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
+	kvm->arch.vmid = kvm_next_vmid;
+	kvm_next_vmid++;
+	kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
+
+	/* update vttbr to be used with the new vmid */
+	pgd_phys = virt_to_phys(kvm->arch.pgd);
+	BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
+	vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
+	kvm->arch.vttbr = pgd_phys | vmid;
+
+	spin_unlock(&kvm_vmid_lock);
+}
+
+static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
+{
+	struct kvm *kvm = vcpu->kvm;
+	int ret = 0;
+
+	if (likely(vcpu->arch.has_run_once))
+		return 0;
+
+	vcpu->arch.has_run_once = true;
+
+	/*
+	 * Map the VGIC hardware resources before running a vcpu the first
+	 * time on this VM.
+	 */
+	if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
+		ret = kvm_vgic_map_resources(kvm);
+		if (ret)
+			return ret;
+	}
+
+	ret = kvm_timer_enable(vcpu);
+
+	return ret;
+}
+
+bool kvm_arch_intc_initialized(struct kvm *kvm)
+{
+	return vgic_initialized(kvm);
+}
+
+void kvm_arm_halt_guest(struct kvm *kvm)
+{
+	int i;
+	struct kvm_vcpu *vcpu;
+
+	kvm_for_each_vcpu(i, vcpu, kvm)
+		vcpu->arch.pause = true;
+	kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
+}
+
+void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
+{
+	vcpu->arch.pause = true;
+	kvm_vcpu_kick(vcpu);
+}
+
+void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
+{
+	struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
+
+	vcpu->arch.pause = false;
+	swake_up(wq);
+}
+
+void kvm_arm_resume_guest(struct kvm *kvm)
+{
+	int i;
+	struct kvm_vcpu *vcpu;
+
+	kvm_for_each_vcpu(i, vcpu, kvm)
+		kvm_arm_resume_vcpu(vcpu);
+}
+
+static void vcpu_sleep(struct kvm_vcpu *vcpu)
+{
+	struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
+
+	swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
+				       (!vcpu->arch.pause)));
+}
+
+static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
+{
+	return vcpu->arch.target >= 0;
+}
+
+/**
+ * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
+ * @vcpu:	The VCPU pointer
+ * @run:	The kvm_run structure pointer used for userspace state exchange
+ *
+ * This function is called through the VCPU_RUN ioctl called from user space. It
+ * will execute VM code in a loop until the time slice for the process is used
+ * or some emulation is needed from user space in which case the function will
+ * return with return value 0 and with the kvm_run structure filled in with the
+ * required data for the requested emulation.
+ */
+int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+	int ret;
+	sigset_t sigsaved;
+
+	if (unlikely(!kvm_vcpu_initialized(vcpu)))
+		return -ENOEXEC;
+
+	ret = kvm_vcpu_first_run_init(vcpu);
+	if (ret)
+		return ret;
+
+	if (run->exit_reason == KVM_EXIT_MMIO) {
+		ret = kvm_handle_mmio_return(vcpu, vcpu->run);
+		if (ret)
+			return ret;
+	}
+
+	if (run->immediate_exit)
+		return -EINTR;
+
+	if (vcpu->sigset_active)
+		sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
+
+	ret = 1;
+	run->exit_reason = KVM_EXIT_UNKNOWN;
+	while (ret > 0) {
+		/*
+		 * Check conditions before entering the guest
+		 */
+		cond_resched();
+
+		update_vttbr(vcpu->kvm);
+
+		if (vcpu->arch.power_off || vcpu->arch.pause)
+			vcpu_sleep(vcpu);
+
+		/*
+		 * Preparing the interrupts to be injected also
+		 * involves poking the GIC, which must be done in a
+		 * non-preemptible context.
+		 */
+		preempt_disable();
+
+		kvm_pmu_flush_hwstate(vcpu);
+
+		kvm_timer_flush_hwstate(vcpu);
+		kvm_vgic_flush_hwstate(vcpu);
+
+		local_irq_disable();
+
+		/*
+		 * If we have a singal pending, or need to notify a userspace
+		 * irqchip about timer or PMU level changes, then we exit (and
+		 * update the timer level state in kvm_timer_update_run
+		 * below).
+		 */
+		if (signal_pending(current) ||
+		    kvm_timer_should_notify_user(vcpu) ||
+		    kvm_pmu_should_notify_user(vcpu)) {
+			ret = -EINTR;
+			run->exit_reason = KVM_EXIT_INTR;
+		}
+
+		if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
+			vcpu->arch.power_off || vcpu->arch.pause) {
+			local_irq_enable();
+			kvm_pmu_sync_hwstate(vcpu);
+			kvm_timer_sync_hwstate(vcpu);
+			kvm_vgic_sync_hwstate(vcpu);
+			preempt_enable();
+			continue;
+		}
+
+		kvm_arm_setup_debug(vcpu);
+
+		/**************************************************************
+		 * Enter the guest
+		 */
+		trace_kvm_entry(*vcpu_pc(vcpu));
+		guest_enter_irqoff();
+		vcpu->mode = IN_GUEST_MODE;
+
+		ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
+
+		vcpu->mode = OUTSIDE_GUEST_MODE;
+		vcpu->stat.exits++;
+		/*
+		 * Back from guest
+		 *************************************************************/
+
+		kvm_arm_clear_debug(vcpu);
+
+		/*
+		 * We may have taken a host interrupt in HYP mode (ie
+		 * while executing the guest). This interrupt is still
+		 * pending, as we haven't serviced it yet!
+		 *
+		 * We're now back in SVC mode, with interrupts
+		 * disabled.  Enabling the interrupts now will have
+		 * the effect of taking the interrupt again, in SVC
+		 * mode this time.
+		 */
+		local_irq_enable();
+
+		/*
+		 * We do local_irq_enable() before calling guest_exit() so
+		 * that if a timer interrupt hits while running the guest we
+		 * account that tick as being spent in the guest.  We enable
+		 * preemption after calling guest_exit() so that if we get
+		 * preempted we make sure ticks after that is not counted as
+		 * guest time.
+		 */
+		guest_exit();
+		trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
+
+		/*
+		 * We must sync the PMU and timer state before the vgic state so
+		 * that the vgic can properly sample the updated state of the
+		 * interrupt line.
+		 */
+		kvm_pmu_sync_hwstate(vcpu);
+		kvm_timer_sync_hwstate(vcpu);
+
+		kvm_vgic_sync_hwstate(vcpu);
+
+		preempt_enable();
+
+		ret = handle_exit(vcpu, run, ret);
+	}
+
+	/* Tell userspace about in-kernel device output levels */
+	if (unlikely(!irqchip_in_kernel(vcpu->kvm))) {
+		kvm_timer_update_run(vcpu);
+		kvm_pmu_update_run(vcpu);
+	}
+
+	if (vcpu->sigset_active)
+		sigprocmask(SIG_SETMASK, &sigsaved, NULL);
+	return ret;
+}
+
+static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
+{
+	int bit_index;
+	bool set;
+	unsigned long *ptr;
+
+	if (number == KVM_ARM_IRQ_CPU_IRQ)
+		bit_index = __ffs(HCR_VI);
+	else /* KVM_ARM_IRQ_CPU_FIQ */
+		bit_index = __ffs(HCR_VF);
+
+	ptr = (unsigned long *)&vcpu->arch.irq_lines;
+	if (level)
+		set = test_and_set_bit(bit_index, ptr);
+	else
+		set = test_and_clear_bit(bit_index, ptr);
+
+	/*
+	 * If we didn't change anything, no need to wake up or kick other CPUs
+	 */
+	if (set == level)
+		return 0;
+
+	/*
+	 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
+	 * trigger a world-switch round on the running physical CPU to set the
+	 * virtual IRQ/FIQ fields in the HCR appropriately.
+	 */
+	kvm_vcpu_kick(vcpu);
+
+	return 0;
+}
+
+int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
+			  bool line_status)
+{
+	u32 irq = irq_level->irq;
+	unsigned int irq_type, vcpu_idx, irq_num;
+	int nrcpus = atomic_read(&kvm->online_vcpus);
+	struct kvm_vcpu *vcpu = NULL;
+	bool level = irq_level->level;
+
+	irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
+	vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
+	irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
+
+	trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
+
+	switch (irq_type) {
+	case KVM_ARM_IRQ_TYPE_CPU:
+		if (irqchip_in_kernel(kvm))
+			return -ENXIO;
+
+		if (vcpu_idx >= nrcpus)
+			return -EINVAL;
+
+		vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+		if (!vcpu)
+			return -EINVAL;
+
+		if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
+			return -EINVAL;
+
+		return vcpu_interrupt_line(vcpu, irq_num, level);
+	case KVM_ARM_IRQ_TYPE_PPI:
+		if (!irqchip_in_kernel(kvm))
+			return -ENXIO;
+
+		if (vcpu_idx >= nrcpus)
+			return -EINVAL;
+
+		vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+		if (!vcpu)
+			return -EINVAL;
+
+		if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
+			return -EINVAL;
+
+		return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
+	case KVM_ARM_IRQ_TYPE_SPI:
+		if (!irqchip_in_kernel(kvm))
+			return -ENXIO;
+
+		if (irq_num < VGIC_NR_PRIVATE_IRQS)
+			return -EINVAL;
+
+		return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
+	}
+
+	return -EINVAL;
+}
+
+static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
+			       const struct kvm_vcpu_init *init)
+{
+	unsigned int i;
+	int phys_target = kvm_target_cpu();
+
+	if (init->target != phys_target)
+		return -EINVAL;
+
+	/*
+	 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
+	 * use the same target.
+	 */
+	if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
+		return -EINVAL;
+
+	/* -ENOENT for unknown features, -EINVAL for invalid combinations. */
+	for (i = 0; i < sizeof(init->features) * 8; i++) {
+		bool set = (init->features[i / 32] & (1 << (i % 32)));
+
+		if (set && i >= KVM_VCPU_MAX_FEATURES)
+			return -ENOENT;
+
+		/*
+		 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
+		 * use the same feature set.
+		 */
+		if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
+		    test_bit(i, vcpu->arch.features) != set)
+			return -EINVAL;
+
+		if (set)
+			set_bit(i, vcpu->arch.features);
+	}
+
+	vcpu->arch.target = phys_target;
+
+	/* Now we know what it is, we can reset it. */
+	return kvm_reset_vcpu(vcpu);
+}
+
+
+static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
+					 struct kvm_vcpu_init *init)
+{
+	int ret;
+
+	ret = kvm_vcpu_set_target(vcpu, init);
+	if (ret)
+		return ret;
+
+	/*
+	 * Ensure a rebooted VM will fault in RAM pages and detect if the
+	 * guest MMU is turned off and flush the caches as needed.
+	 */
+	if (vcpu->arch.has_run_once)
+		stage2_unmap_vm(vcpu->kvm);
+
+	vcpu_reset_hcr(vcpu);
+
+	/*
+	 * Handle the "start in power-off" case.
+	 */
+	if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
+		vcpu->arch.power_off = true;
+	else
+		vcpu->arch.power_off = false;
+
+	return 0;
+}
+
+static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
+				 struct kvm_device_attr *attr)
+{
+	int ret = -ENXIO;
+
+	switch (attr->group) {
+	default:
+		ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
+		break;
+	}
+
+	return ret;
+}
+
+static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
+				 struct kvm_device_attr *attr)
+{
+	int ret = -ENXIO;
+
+	switch (attr->group) {
+	default:
+		ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
+		break;
+	}
+
+	return ret;
+}
+
+static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
+				 struct kvm_device_attr *attr)
+{
+	int ret = -ENXIO;
+
+	switch (attr->group) {
+	default:
+		ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
+		break;
+	}
+
+	return ret;
+}
+
+long kvm_arch_vcpu_ioctl(struct file *filp,
+			 unsigned int ioctl, unsigned long arg)
+{
+	struct kvm_vcpu *vcpu = filp->private_data;
+	void __user *argp = (void __user *)arg;
+	struct kvm_device_attr attr;
+
+	switch (ioctl) {
+	case KVM_ARM_VCPU_INIT: {
+		struct kvm_vcpu_init init;
+
+		if (copy_from_user(&init, argp, sizeof(init)))
+			return -EFAULT;
+
+		return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
+	}
+	case KVM_SET_ONE_REG:
+	case KVM_GET_ONE_REG: {
+		struct kvm_one_reg reg;
+
+		if (unlikely(!kvm_vcpu_initialized(vcpu)))
+			return -ENOEXEC;
+
+		if (copy_from_user(&reg, argp, sizeof(reg)))
+			return -EFAULT;
+		if (ioctl == KVM_SET_ONE_REG)
+			return kvm_arm_set_reg(vcpu, &reg);
+		else
+			return kvm_arm_get_reg(vcpu, &reg);
+	}
+	case KVM_GET_REG_LIST: {
+		struct kvm_reg_list __user *user_list = argp;
+		struct kvm_reg_list reg_list;
+		unsigned n;
+
+		if (unlikely(!kvm_vcpu_initialized(vcpu)))
+			return -ENOEXEC;
+
+		if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
+			return -EFAULT;
+		n = reg_list.n;
+		reg_list.n = kvm_arm_num_regs(vcpu);
+		if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
+			return -EFAULT;
+		if (n < reg_list.n)
+			return -E2BIG;
+		return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
+	}
+	case KVM_SET_DEVICE_ATTR: {
+		if (copy_from_user(&attr, argp, sizeof(attr)))
+			return -EFAULT;
+		return kvm_arm_vcpu_set_attr(vcpu, &attr);
+	}
+	case KVM_GET_DEVICE_ATTR: {
+		if (copy_from_user(&attr, argp, sizeof(attr)))
+			return -EFAULT;
+		return kvm_arm_vcpu_get_attr(vcpu, &attr);
+	}
+	case KVM_HAS_DEVICE_ATTR: {
+		if (copy_from_user(&attr, argp, sizeof(attr)))
+			return -EFAULT;
+		return kvm_arm_vcpu_has_attr(vcpu, &attr);
+	}
+	default:
+		return -EINVAL;
+	}
+}
+
+/**
+ * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
+ * @kvm: kvm instance
+ * @log: slot id and address to which we copy the log
+ *
+ * Steps 1-4 below provide general overview of dirty page logging. See
+ * kvm_get_dirty_log_protect() function description for additional details.
+ *
+ * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
+ * always flush the TLB (step 4) even if previous step failed  and the dirty
+ * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
+ * does not preclude user space subsequent dirty log read. Flushing TLB ensures
+ * writes will be marked dirty for next log read.
+ *
+ *   1. Take a snapshot of the bit and clear it if needed.
+ *   2. Write protect the corresponding page.
+ *   3. Copy the snapshot to the userspace.
+ *   4. Flush TLB's if needed.
+ */
+int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
+{
+	bool is_dirty = false;
+	int r;
+
+	mutex_lock(&kvm->slots_lock);
+
+	r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
+
+	if (is_dirty)
+		kvm_flush_remote_tlbs(kvm);
+
+	mutex_unlock(&kvm->slots_lock);
+	return r;
+}
+
+static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
+					struct kvm_arm_device_addr *dev_addr)
+{
+	unsigned long dev_id, type;
+
+	dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
+		KVM_ARM_DEVICE_ID_SHIFT;
+	type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
+		KVM_ARM_DEVICE_TYPE_SHIFT;
+
+	switch (dev_id) {
+	case KVM_ARM_DEVICE_VGIC_V2:
+		if (!vgic_present)
+			return -ENXIO;
+		return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
+	default:
+		return -ENODEV;
+	}
+}
+
+long kvm_arch_vm_ioctl(struct file *filp,
+		       unsigned int ioctl, unsigned long arg)
+{
+	struct kvm *kvm = filp->private_data;
+	void __user *argp = (void __user *)arg;
+
+	switch (ioctl) {
+	case KVM_CREATE_IRQCHIP: {
+		int ret;
+		if (!vgic_present)
+			return -ENXIO;
+		mutex_lock(&kvm->lock);
+		ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
+		mutex_unlock(&kvm->lock);
+		return ret;
+	}
+	case KVM_ARM_SET_DEVICE_ADDR: {
+		struct kvm_arm_device_addr dev_addr;
+
+		if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
+			return -EFAULT;
+		return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
+	}
+	case KVM_ARM_PREFERRED_TARGET: {
+		int err;
+		struct kvm_vcpu_init init;
+
+		err = kvm_vcpu_preferred_target(&init);
+		if (err)
+			return err;
+
+		if (copy_to_user(argp, &init, sizeof(init)))
+			return -EFAULT;
+
+		return 0;
+	}
+	default:
+		return -EINVAL;
+	}
+}
+
+static void cpu_init_hyp_mode(void *dummy)
+{
+	phys_addr_t pgd_ptr;
+	unsigned long hyp_stack_ptr;
+	unsigned long stack_page;
+	unsigned long vector_ptr;
+
+	/* Switch from the HYP stub to our own HYP init vector */
+	__hyp_set_vectors(kvm_get_idmap_vector());
+
+	pgd_ptr = kvm_mmu_get_httbr();
+	stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
+	hyp_stack_ptr = stack_page + PAGE_SIZE;
+	vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
+
+	__cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
+	__cpu_init_stage2();
+
+	if (is_kernel_in_hyp_mode())
+		kvm_timer_init_vhe();
+
+	kvm_arm_init_debug();
+}
+
+static void cpu_hyp_reset(void)
+{
+	if (!is_kernel_in_hyp_mode())
+		__hyp_reset_vectors();
+}
+
+static void cpu_hyp_reinit(void)
+{
+	cpu_hyp_reset();
+
+	if (is_kernel_in_hyp_mode()) {
+		/*
+		 * __cpu_init_stage2() is safe to call even if the PM
+		 * event was cancelled before the CPU was reset.
+		 */
+		__cpu_init_stage2();
+	} else {
+		cpu_init_hyp_mode(NULL);
+	}
+
+	if (vgic_present)
+		kvm_vgic_init_cpu_hardware();
+}
+
+static void _kvm_arch_hardware_enable(void *discard)
+{
+	if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
+		cpu_hyp_reinit();
+		__this_cpu_write(kvm_arm_hardware_enabled, 1);
+	}
+}
+
+int kvm_arch_hardware_enable(void)
+{
+	_kvm_arch_hardware_enable(NULL);
+	return 0;
+}
+
+static void _kvm_arch_hardware_disable(void *discard)
+{
+	if (__this_cpu_read(kvm_arm_hardware_enabled)) {
+		cpu_hyp_reset();
+		__this_cpu_write(kvm_arm_hardware_enabled, 0);
+	}
+}
+
+void kvm_arch_hardware_disable(void)
+{
+	_kvm_arch_hardware_disable(NULL);
+}
+
+#ifdef CONFIG_CPU_PM
+static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
+				    unsigned long cmd,
+				    void *v)
+{
+	/*
+	 * kvm_arm_hardware_enabled is left with its old value over
+	 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
+	 * re-enable hyp.
+	 */
+	switch (cmd) {
+	case CPU_PM_ENTER:
+		if (__this_cpu_read(kvm_arm_hardware_enabled))
+			/*
+			 * don't update kvm_arm_hardware_enabled here
+			 * so that the hardware will be re-enabled
+			 * when we resume. See below.
+			 */
+			cpu_hyp_reset();
+
+		return NOTIFY_OK;
+	case CPU_PM_EXIT:
+		if (__this_cpu_read(kvm_arm_hardware_enabled))
+			/* The hardware was enabled before suspend. */
+			cpu_hyp_reinit();
+
+		return NOTIFY_OK;
+
+	default:
+		return NOTIFY_DONE;
+	}
+}
+
+static struct notifier_block hyp_init_cpu_pm_nb = {
+	.notifier_call = hyp_init_cpu_pm_notifier,
+};
+
+static void __init hyp_cpu_pm_init(void)
+{
+	cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
+}
+static void __init hyp_cpu_pm_exit(void)
+{
+	cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
+}
+#else
+static inline void hyp_cpu_pm_init(void)
+{
+}
+static inline void hyp_cpu_pm_exit(void)
+{
+}
+#endif
+
+static void teardown_common_resources(void)
+{
+	free_percpu(kvm_host_cpu_state);
+}
+
+static int init_common_resources(void)
+{
+	kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
+	if (!kvm_host_cpu_state) {
+		kvm_err("Cannot allocate host CPU state\n");
+		return -ENOMEM;
+	}
+
+	/* set size of VMID supported by CPU */
+	kvm_vmid_bits = kvm_get_vmid_bits();
+	kvm_info("%d-bit VMID\n", kvm_vmid_bits);
+
+	return 0;
+}
+
+static int init_subsystems(void)
+{
+	int err = 0;
+
+	/*
+	 * Enable hardware so that subsystem initialisation can access EL2.
+	 */
+	on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
+
+	/*
+	 * Register CPU lower-power notifier
+	 */
+	hyp_cpu_pm_init();
+
+	/*
+	 * Init HYP view of VGIC
+	 */
+	err = kvm_vgic_hyp_init();
+	switch (err) {
+	case 0:
+		vgic_present = true;
+		break;
+	case -ENODEV:
+	case -ENXIO:
+		vgic_present = false;
+		err = 0;
+		break;
+	default:
+		goto out;
+	}
+
+	/*
+	 * Init HYP architected timer support
+	 */
+	err = kvm_timer_hyp_init();
+	if (err)
+		goto out;
+
+	kvm_perf_init();
+	kvm_coproc_table_init();
+
+out:
+	on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
+
+	return err;
+}
+
+static void teardown_hyp_mode(void)
+{
+	int cpu;
+
+	if (is_kernel_in_hyp_mode())
+		return;
+
+	free_hyp_pgds();
+	for_each_possible_cpu(cpu)
+		free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
+	hyp_cpu_pm_exit();
+}
+
+static int init_vhe_mode(void)
+{
+	kvm_info("VHE mode initialized successfully\n");
+	return 0;
+}
+
+/**
+ * Inits Hyp-mode on all online CPUs
+ */
+static int init_hyp_mode(void)
+{
+	int cpu;
+	int err = 0;
+
+	/*
+	 * Allocate Hyp PGD and setup Hyp identity mapping
+	 */
+	err = kvm_mmu_init();
+	if (err)
+		goto out_err;
+
+	/*
+	 * Allocate stack pages for Hypervisor-mode
+	 */
+	for_each_possible_cpu(cpu) {
+		unsigned long stack_page;
+
+		stack_page = __get_free_page(GFP_KERNEL);
+		if (!stack_page) {
+			err = -ENOMEM;
+			goto out_err;
+		}
+
+		per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
+	}
+
+	/*
+	 * Map the Hyp-code called directly from the host
+	 */
+	err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
+				  kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
+	if (err) {
+		kvm_err("Cannot map world-switch code\n");
+		goto out_err;
+	}
+
+	err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
+				  kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
+	if (err) {
+		kvm_err("Cannot map rodata section\n");
+		goto out_err;
+	}
+
+	err = create_hyp_mappings(kvm_ksym_ref(__bss_start),
+				  kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
+	if (err) {
+		kvm_err("Cannot map bss section\n");
+		goto out_err;
+	}
+
+	/*
+	 * Map the Hyp stack pages
+	 */
+	for_each_possible_cpu(cpu) {
+		char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
+		err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
+					  PAGE_HYP);
+
+		if (err) {
+			kvm_err("Cannot map hyp stack\n");
+			goto out_err;
+		}
+	}
+
+	for_each_possible_cpu(cpu) {
+		kvm_cpu_context_t *cpu_ctxt;
+
+		cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
+		err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
+
+		if (err) {
+			kvm_err("Cannot map host CPU state: %d\n", err);
+			goto out_err;
+		}
+	}
+
+	kvm_info("Hyp mode initialized successfully\n");
+
+	return 0;
+
+out_err:
+	teardown_hyp_mode();
+	kvm_err("error initializing Hyp mode: %d\n", err);
+	return err;
+}
+
+static void check_kvm_target_cpu(void *ret)
+{
+	*(int *)ret = kvm_target_cpu();
+}
+
+struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
+{
+	struct kvm_vcpu *vcpu;
+	int i;
+
+	mpidr &= MPIDR_HWID_BITMASK;
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
+			return vcpu;
+	}
+	return NULL;
+}
+
+/**
+ * Initialize Hyp-mode and memory mappings on all CPUs.
+ */
+int kvm_arch_init(void *opaque)
+{
+	int err;
+	int ret, cpu;
+
+	if (!is_hyp_mode_available()) {
+		kvm_err("HYP mode not available\n");
+		return -ENODEV;
+	}
+
+	for_each_online_cpu(cpu) {
+		smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
+		if (ret < 0) {
+			kvm_err("Error, CPU %d not supported!\n", cpu);
+			return -ENODEV;
+		}
+	}
+
+	err = init_common_resources();
+	if (err)
+		return err;
+
+	if (is_kernel_in_hyp_mode())
+		err = init_vhe_mode();
+	else
+		err = init_hyp_mode();
+	if (err)
+		goto out_err;
+
+	err = init_subsystems();
+	if (err)
+		goto out_hyp;
+
+	return 0;
+
+out_hyp:
+	teardown_hyp_mode();
+out_err:
+	teardown_common_resources();
+	return err;
+}
+
+/* NOP: Compiling as a module not supported */
+void kvm_arch_exit(void)
+{
+	kvm_perf_teardown();
+}
+
+static int arm_init(void)
+{
+	int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
+	return rc;
+}
+
+module_init(arm_init);