arm.c 32.8 KB
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/*
 * 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.
 */

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#include <linux/cpu_pm.h>
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#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
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#include <linux/list.h>
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#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/mman.h>
#include <linux/sched.h>
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#include <linux/kvm.h>
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#include <trace/events/kvm.h>
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#include <kvm/arm_pmu.h>
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#define CREATE_TRACE_POINTS
#include "trace.h"

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#include <linux/uaccess.h>
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#include <asm/ptrace.h>
#include <asm/mman.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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#include <asm/virt.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmu.h>
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#include <asm/kvm_emulate.h>
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#include <asm/kvm_coproc.h>
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#include <asm/kvm_psci.h>
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#include <asm/sections.h>
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#ifdef REQUIRES_VIRT
__asm__(".arch_extension	virt");
#endif

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static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
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static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
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/* Per-CPU variable containing the currently running vcpu. */
static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);

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/* The VMID used in the VTTBR */
static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
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static u32 kvm_next_vmid;
static unsigned int kvm_vmid_bits __read_mostly;
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static DEFINE_SPINLOCK(kvm_vmid_lock);
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static bool vgic_present;

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static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);

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static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
{
	BUG_ON(preemptible());
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	__this_cpu_write(kvm_arm_running_vcpu, vcpu);
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}

/**
 * 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());
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	return __this_cpu_read(kvm_arm_running_vcpu);
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}

/**
 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
 */
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struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
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{
	return &kvm_arm_running_vcpu;
}

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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;
}


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/**
 * kvm_arch_init_vm - initializes a VM data structure
 * @kvm:	pointer to the KVM struct
 */
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int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
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	int ret, cpu;
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	if (type)
		return -EINVAL;

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	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;

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	ret = kvm_alloc_stage2_pgd(kvm);
	if (ret)
		goto out_fail_alloc;

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	ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
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	if (ret)
		goto out_free_stage2_pgd;

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	kvm_vgic_early_init(kvm);
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	/* Mark the initial VMID generation invalid */
	kvm->arch.vmid_gen = 0;

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	/* The maximum number of VCPUs is limited by the host's GIC model */
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	kvm->arch.max_vcpus = vgic_present ?
				kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
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	return ret;
out_free_stage2_pgd:
	kvm_free_stage2_pgd(kvm);
out_fail_alloc:
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	free_percpu(kvm->arch.last_vcpu_ran);
	kvm->arch.last_vcpu_ran = NULL;
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	return ret;
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}

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bool kvm_arch_has_vcpu_debugfs(void)
{
	return false;
}

int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
{
	return 0;
}

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int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
	return VM_FAULT_SIGBUS;
}


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/**
 * kvm_arch_destroy_vm - destroy the VM data structure
 * @kvm:	pointer to the KVM struct
 */
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void kvm_arch_destroy_vm(struct kvm *kvm)
{
	int i;

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	free_percpu(kvm->arch.last_vcpu_ran);
	kvm->arch.last_vcpu_ran = NULL;

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	for (i = 0; i < KVM_MAX_VCPUS; ++i) {
		if (kvm->vcpus[i]) {
			kvm_arch_vcpu_free(kvm->vcpus[i]);
			kvm->vcpus[i] = NULL;
		}
	}
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	kvm_vgic_destroy(kvm);
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}

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int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
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{
	int r;
	switch (ext) {
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	case KVM_CAP_IRQCHIP:
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		r = vgic_present;
		break;
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	case KVM_CAP_IOEVENTFD:
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	case KVM_CAP_DEVICE_CTRL:
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	case KVM_CAP_USER_MEMORY:
	case KVM_CAP_SYNC_MMU:
	case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
	case KVM_CAP_ONE_REG:
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	case KVM_CAP_ARM_PSCI:
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	case KVM_CAP_ARM_PSCI_0_2:
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	case KVM_CAP_READONLY_MEM:
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	case KVM_CAP_MP_STATE:
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	case KVM_CAP_IMMEDIATE_EXIT:
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		r = 1;
		break;
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	case KVM_CAP_ARM_SET_DEVICE_ADDR:
		r = 1;
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		break;
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	case KVM_CAP_NR_VCPUS:
		r = num_online_cpus();
		break;
	case KVM_CAP_MAX_VCPUS:
		r = KVM_MAX_VCPUS;
		break;
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	case KVM_CAP_NR_MEMSLOTS:
		r = KVM_USER_MEM_SLOTS;
		break;
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	case KVM_CAP_MSI_DEVID:
		if (!kvm)
			r = -EINVAL;
		else
			r = kvm->arch.vgic.msis_require_devid;
		break;
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	case KVM_CAP_ARM_USER_IRQ:
		/*
		 * 1: EL1_VTIMER, EL1_PTIMER, and PMU.
		 * (bump this number if adding more devices)
		 */
		r = 1;
		break;
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	default:
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		r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
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		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;

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	if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
		err = -EBUSY;
		goto out;
	}

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	if (id >= kvm->arch.max_vcpus) {
		err = -EINVAL;
		goto out;
	}

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	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;

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	err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
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	if (err)
		goto vcpu_uninit;

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	return vcpu;
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vcpu_uninit:
	kvm_vcpu_uninit(vcpu);
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free_vcpu:
	kmem_cache_free(kvm_vcpu_cache, vcpu);
out:
	return ERR_PTR(err);
}

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void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
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{
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	kvm_vgic_vcpu_early_init(vcpu);
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}

void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
{
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	kvm_mmu_free_memory_caches(vcpu);
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	kvm_timer_vcpu_terminate(vcpu);
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	kvm_vgic_vcpu_destroy(vcpu);
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	kvm_pmu_vcpu_destroy(vcpu);
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	kvm_vcpu_uninit(vcpu);
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	kmem_cache_free(kvm_vcpu_cache, vcpu);
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}

void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
	kvm_arch_vcpu_free(vcpu);
}

int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
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	return kvm_timer_should_fire(vcpu_vtimer(vcpu)) ||
	       kvm_timer_should_fire(vcpu_ptimer(vcpu));
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}

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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);
}

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int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
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	/* Force users to call KVM_ARM_VCPU_INIT */
	vcpu->arch.target = -1;
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	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
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	/* Set up the timer */
	kvm_timer_vcpu_init(vcpu);

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	kvm_arm_reset_debug_ptr(vcpu);

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	return kvm_vgic_vcpu_init(vcpu);
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}

void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
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	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;
	}

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	vcpu->cpu = cpu;
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	vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
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	kvm_arm_set_running_vcpu(vcpu);
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	kvm_vgic_load(vcpu);
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}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
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	kvm_vgic_put(vcpu);

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	vcpu->cpu = -1;

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	kvm_arm_set_running_vcpu(NULL);
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	kvm_timer_vcpu_put(vcpu);
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}

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static void vcpu_power_off(struct kvm_vcpu *vcpu)
{
	vcpu->arch.power_off = true;
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	kvm_make_request(KVM_REQ_SLEEP, vcpu);
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	kvm_vcpu_kick(vcpu);
}

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int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
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	if (vcpu->arch.power_off)
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		mp_state->mp_state = KVM_MP_STATE_STOPPED;
	else
		mp_state->mp_state = KVM_MP_STATE_RUNNABLE;

	return 0;
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}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
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	switch (mp_state->mp_state) {
	case KVM_MP_STATE_RUNNABLE:
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		vcpu->arch.power_off = false;
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		break;
	case KVM_MP_STATE_STOPPED:
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		vcpu_power_off(vcpu);
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		break;
	default:
		return -EINVAL;
	}

	return 0;
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}

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/**
 * 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.
 */
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int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
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	return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
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		&& !v->arch.power_off && !v->arch.pause);
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}

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/* Just ensure a guest exit from a particular CPU */
static void exit_vm_noop(void *info)
{
}

void force_vm_exit(const cpumask_t *mask)
{
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	preempt_disable();
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	smp_call_function_many(mask, exit_vm_noop, NULL, true);
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	preempt_enable();
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}

/**
 * need_new_vmid_gen - check that the VMID is still valid
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 * @kvm: The VM's VMID to check
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 *
 * 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++;
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	kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
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	/* update vttbr to be used with the new vmid */
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	pgd_phys = virt_to_phys(kvm->arch.pgd);
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	BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
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	vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
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	kvm->arch.vttbr = pgd_phys | vmid;
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	spin_unlock(&kvm_vmid_lock);
}

static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
{
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	struct kvm *kvm = vcpu->kvm;
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	int ret = 0;
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	if (likely(vcpu->arch.has_run_once))
		return 0;

	vcpu->arch.has_run_once = true;
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	/*
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	 * Map the VGIC hardware resources before running a vcpu the first
	 * time on this VM.
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	 */
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	if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
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		ret = kvm_vgic_map_resources(kvm);
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		if (ret)
			return ret;
	}

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	ret = kvm_timer_enable(vcpu);
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	if (ret)
		return ret;

	ret = kvm_arm_pmu_v3_enable(vcpu);
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	return ret;
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}

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bool kvm_arch_intc_initialized(struct kvm *kvm)
{
	return vgic_initialized(kvm);
}

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void kvm_arm_halt_guest(struct kvm *kvm)
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{
	int i;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(i, vcpu, kvm)
		vcpu->arch.pause = true;
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	kvm_make_all_cpus_request(kvm, KVM_REQ_SLEEP);
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}

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void kvm_arm_resume_guest(struct kvm *kvm)
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{
	int i;
	struct kvm_vcpu *vcpu;

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	kvm_for_each_vcpu(i, vcpu, kvm) {
		vcpu->arch.pause = false;
		swake_up(kvm_arch_vcpu_wq(vcpu));
	}
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}

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static void vcpu_req_sleep(struct kvm_vcpu *vcpu)
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{
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	struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
567

568
	swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
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				       (!vcpu->arch.pause)));
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Andrew Jones 已提交
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	if (vcpu->arch.power_off || vcpu->arch.pause) {
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		/* Awaken to handle a signal, request we sleep again later. */
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		kvm_make_request(KVM_REQ_SLEEP, vcpu);
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	}
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}

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static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
{
	return vcpu->arch.target >= 0;
}

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static void check_vcpu_requests(struct kvm_vcpu *vcpu)
{
	if (kvm_request_pending(vcpu)) {
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		if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
			vcpu_req_sleep(vcpu);
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		/*
		 * Clear IRQ_PENDING requests that were made to guarantee
		 * that a VCPU sees new virtual interrupts.
		 */
		kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu);
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	}
}

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/**
 * 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.
 */
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int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
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	int ret;
	sigset_t sigsaved;

612
	if (unlikely(!kvm_vcpu_initialized(vcpu)))
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		return -ENOEXEC;

	ret = kvm_vcpu_first_run_init(vcpu);
	if (ret)
		return ret;

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Christoffer Dall 已提交
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	if (run->exit_reason == KVM_EXIT_MMIO) {
		ret = kvm_handle_mmio_return(vcpu, vcpu->run);
		if (ret)
			return ret;
	}

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	if (run->immediate_exit)
		return -EINTR;

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	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);

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		check_vcpu_requests(vcpu);

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		/*
		 * Preparing the interrupts to be injected also
		 * involves poking the GIC, which must be done in a
		 * non-preemptible context.
		 */
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		preempt_disable();
649

650
		kvm_pmu_flush_hwstate(vcpu);
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652
		kvm_timer_flush_hwstate(vcpu);
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		kvm_vgic_flush_hwstate(vcpu);

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		local_irq_disable();

		/*
658
		 * If we have a singal pending, or need to notify a userspace
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		 * irqchip about timer or PMU level changes, then we exit (and
		 * update the timer level state in kvm_timer_update_run
		 * below).
662
		 */
663
		if (signal_pending(current) ||
664 665
		    kvm_timer_should_notify_user(vcpu) ||
		    kvm_pmu_should_notify_user(vcpu)) {
666 667 668 669
			ret = -EINTR;
			run->exit_reason = KVM_EXIT_INTR;
		}

670 671 672 673 674 675 676 677
		/*
		 * Ensure we set mode to IN_GUEST_MODE after we disable
		 * interrupts and before the final VCPU requests check.
		 * See the comment in kvm_vcpu_exiting_guest_mode() and
		 * Documentation/virtual/kvm/vcpu-requests.rst
		 */
		smp_store_mb(vcpu->mode, IN_GUEST_MODE);

678
		if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
A
Andrew Jones 已提交
679
		    kvm_request_pending(vcpu)) {
680
			vcpu->mode = OUTSIDE_GUEST_MODE;
681
			local_irq_enable();
682
			kvm_pmu_sync_hwstate(vcpu);
683
			kvm_timer_sync_hwstate(vcpu);
684
			kvm_vgic_sync_hwstate(vcpu);
685
			preempt_enable();
686 687 688
			continue;
		}

689 690
		kvm_arm_setup_debug(vcpu);

691 692 693 694
		/**************************************************************
		 * Enter the guest
		 */
		trace_kvm_entry(*vcpu_pc(vcpu));
695
		guest_enter_irqoff();
696 697 698 699

		ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);

		vcpu->mode = OUTSIDE_GUEST_MODE;
700
		vcpu->stat.exits++;
701 702 703 704
		/*
		 * Back from guest
		 *************************************************************/

705 706
		kvm_arm_clear_debug(vcpu);

707 708 709 710 711 712 713 714 715 716 717 718 719
		/*
		 * 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();

		/*
720
		 * We do local_irq_enable() before calling guest_exit() so
721 722
		 * that if a timer interrupt hits while running the guest we
		 * account that tick as being spent in the guest.  We enable
723
		 * preemption after calling guest_exit() so that if we get
724 725 726
		 * preempted we make sure ticks after that is not counted as
		 * guest time.
		 */
727
		guest_exit();
728
		trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
729

730
		/*
731 732
		 * We must sync the PMU and timer state before the vgic state so
		 * that the vgic can properly sample the updated state of the
733 734
		 * interrupt line.
		 */
735
		kvm_pmu_sync_hwstate(vcpu);
736 737
		kvm_timer_sync_hwstate(vcpu);

738
		kvm_vgic_sync_hwstate(vcpu);
739 740 741

		preempt_enable();

742 743 744
		ret = handle_exit(vcpu, run, ret);
	}

745
	/* Tell userspace about in-kernel device output levels */
746 747 748 749
	if (unlikely(!irqchip_in_kernel(vcpu->kvm))) {
		kvm_timer_update_run(vcpu);
		kvm_pmu_update_run(vcpu);
	}
750

751 752 753
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &sigsaved, NULL);
	return ret;
754 755
}

756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783
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.
	 */
784
	kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
785 786 787 788 789
	kvm_vcpu_kick(vcpu);

	return 0;
}

790 791
int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
			  bool line_status)
792 793 794 795 796 797 798 799 800 801 802 803 804
{
	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);

805 806 807 808
	switch (irq_type) {
	case KVM_ARM_IRQ_TYPE_CPU:
		if (irqchip_in_kernel(kvm))
			return -ENXIO;
809

810 811
		if (vcpu_idx >= nrcpus)
			return -EINVAL;
812

813 814 815
		vcpu = kvm_get_vcpu(kvm, vcpu_idx);
		if (!vcpu)
			return -EINVAL;
816

817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
		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;
834

835
		return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level, NULL);
836 837 838 839
	case KVM_ARM_IRQ_TYPE_SPI:
		if (!irqchip_in_kernel(kvm))
			return -ENXIO;

840
		if (irq_num < VGIC_NR_PRIVATE_IRQS)
841 842
			return -EINVAL;

843
		return kvm_vgic_inject_irq(kvm, 0, irq_num, level, NULL);
844 845 846
	}

	return -EINVAL;
847 848
}

849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890
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);
}


891 892 893 894 895 896 897 898 899
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;

900 901 902 903 904 905 906
	/*
	 * 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);

907 908
	vcpu_reset_hcr(vcpu);

909
	/*
910
	 * Handle the "start in power-off" case.
911
	 */
912
	if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
A
Andrew Jones 已提交
913
		vcpu_power_off(vcpu);
914
	else
915
		vcpu->arch.power_off = false;
916 917 918 919

	return 0;
}

920 921 922 923 924 925 926
static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
				 struct kvm_device_attr *attr)
{
	int ret = -ENXIO;

	switch (attr->group) {
	default:
927
		ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
928 929 930 931 932 933 934 935 936 937 938 939 940
		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:
941
		ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
942 943 944 945 946 947 948 949 950 951 952 953 954
		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:
955
		ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
956 957 958 959 960 961
		break;
	}

	return ret;
}

962 963 964 965 966
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;
967
	struct kvm_device_attr attr;
968 969 970 971 972 973 974 975

	switch (ioctl) {
	case KVM_ARM_VCPU_INIT: {
		struct kvm_vcpu_init init;

		if (copy_from_user(&init, argp, sizeof(init)))
			return -EFAULT;

976
		return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
977 978 979 980
	}
	case KVM_SET_ONE_REG:
	case KVM_GET_ONE_REG: {
		struct kvm_one_reg reg;
981 982 983 984

		if (unlikely(!kvm_vcpu_initialized(vcpu)))
			return -ENOEXEC;

985 986 987 988 989 990 991 992 993 994 995 996
		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;

997 998 999
		if (unlikely(!kvm_vcpu_initialized(vcpu)))
			return -ENOEXEC;

1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
		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);
	}
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
	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);
	}
1025 1026 1027 1028 1029
	default:
		return -EINVAL;
	}
}

1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
/**
 * 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.
 */
1049 1050
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
	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;
1063 1064
}

1065 1066 1067
static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
					struct kvm_arm_device_addr *dev_addr)
{
1068 1069 1070 1071 1072 1073 1074 1075 1076
	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:
1077 1078
		if (!vgic_present)
			return -ENXIO;
1079
		return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
1080 1081 1082
	default:
		return -ENODEV;
	}
1083 1084
}

1085 1086 1087
long kvm_arch_vm_ioctl(struct file *filp,
		       unsigned int ioctl, unsigned long arg)
{
1088 1089 1090 1091
	struct kvm *kvm = filp->private_data;
	void __user *argp = (void __user *)arg;

	switch (ioctl) {
1092
	case KVM_CREATE_IRQCHIP: {
1093
		int ret;
1094 1095
		if (!vgic_present)
			return -ENXIO;
1096 1097 1098 1099
		mutex_lock(&kvm->lock);
		ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
		mutex_unlock(&kvm->lock);
		return ret;
1100
	}
1101 1102 1103 1104 1105 1106 1107
	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);
	}
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120
	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;
	}
1121 1122 1123
	default:
		return -EINVAL;
	}
1124 1125
}

1126
static void cpu_init_hyp_mode(void *dummy)
1127
{
1128
	phys_addr_t pgd_ptr;
1129 1130 1131 1132 1133
	unsigned long hyp_stack_ptr;
	unsigned long stack_page;
	unsigned long vector_ptr;

	/* Switch from the HYP stub to our own HYP init vector */
1134
	__hyp_set_vectors(kvm_get_idmap_vector());
1135

1136
	pgd_ptr = kvm_mmu_get_httbr();
1137
	stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1138
	hyp_stack_ptr = stack_page + PAGE_SIZE;
1139
	vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
1140

M
Marc Zyngier 已提交
1141
	__cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
1142
	__cpu_init_stage2();
1143

1144 1145 1146
	if (is_kernel_in_hyp_mode())
		kvm_timer_init_vhe();

1147
	kvm_arm_init_debug();
1148 1149
}

1150 1151 1152 1153 1154 1155
static void cpu_hyp_reset(void)
{
	if (!is_kernel_in_hyp_mode())
		__hyp_reset_vectors();
}

1156 1157
static void cpu_hyp_reinit(void)
{
1158 1159
	cpu_hyp_reset();

1160 1161
	if (is_kernel_in_hyp_mode()) {
		/*
1162
		 * __cpu_init_stage2() is safe to call even if the PM
1163 1164
		 * event was cancelled before the CPU was reset.
		 */
1165
		__cpu_init_stage2();
1166
	} else {
1167
		cpu_init_hyp_mode(NULL);
1168
	}
1169 1170 1171

	if (vgic_present)
		kvm_vgic_init_cpu_hardware();
1172 1173
}

1174 1175 1176
static void _kvm_arch_hardware_enable(void *discard)
{
	if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1177
		cpu_hyp_reinit();
1178
		__this_cpu_write(kvm_arm_hardware_enabled, 1);
1179
	}
1180
}
1181

1182 1183 1184 1185
int kvm_arch_hardware_enable(void)
{
	_kvm_arch_hardware_enable(NULL);
	return 0;
1186 1187
}

1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
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);
}
1200

1201 1202 1203 1204 1205
#ifdef CONFIG_CPU_PM
static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
				    unsigned long cmd,
				    void *v)
{
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
	/*
	 * 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();

1221
		return NOTIFY_OK;
1222 1223 1224 1225
	case CPU_PM_EXIT:
		if (__this_cpu_read(kvm_arm_hardware_enabled))
			/* The hardware was enabled before suspend. */
			cpu_hyp_reinit();
1226

1227 1228 1229 1230 1231
		return NOTIFY_OK;

	default:
		return NOTIFY_DONE;
	}
1232 1233 1234 1235 1236 1237 1238 1239 1240 1241
}

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);
}
1242 1243 1244 1245
static void __init hyp_cpu_pm_exit(void)
{
	cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
}
1246 1247 1248 1249
#else
static inline void hyp_cpu_pm_init(void)
{
}
1250 1251 1252
static inline void hyp_cpu_pm_exit(void)
{
}
1253 1254
#endif

1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267
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;
	}

1268 1269 1270 1271
	/* set size of VMID supported by CPU */
	kvm_vmid_bits = kvm_get_vmid_bits();
	kvm_info("%d-bit VMID\n", kvm_vmid_bits);

1272 1273 1274 1275 1276
	return 0;
}

static int init_subsystems(void)
{
1277
	int err = 0;
1278

1279
	/*
1280
	 * Enable hardware so that subsystem initialisation can access EL2.
1281
	 */
1282
	on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1283 1284 1285 1286 1287 1288

	/*
	 * Register CPU lower-power notifier
	 */
	hyp_cpu_pm_init();

1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
	/*
	 * 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;
1300
		err = 0;
1301 1302
		break;
	default:
1303
		goto out;
1304 1305 1306 1307 1308 1309 1310
	}

	/*
	 * Init HYP architected timer support
	 */
	err = kvm_timer_hyp_init();
	if (err)
1311
		goto out;
1312 1313 1314 1315

	kvm_perf_init();
	kvm_coproc_table_init();

1316 1317 1318 1319
out:
	on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);

	return err;
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
}

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));
1332
	hyp_cpu_pm_exit();
1333 1334 1335 1336 1337 1338 1339 1340
}

static int init_vhe_mode(void)
{
	kvm_info("VHE mode initialized successfully\n");
	return 0;
}

1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364
/**
 * 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;
1365
			goto out_err;
1366 1367 1368 1369 1370 1371 1372 1373
		}

		per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
	}

	/*
	 * Map the Hyp-code called directly from the host
	 */
1374
	err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1375
				  kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1376 1377
	if (err) {
		kvm_err("Cannot map world-switch code\n");
1378
		goto out_err;
1379 1380
	}

1381
	err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1382
				  kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1383 1384
	if (err) {
		kvm_err("Cannot map rodata section\n");
M
Marc Zyngier 已提交
1385 1386 1387 1388 1389 1390 1391
		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");
1392
		goto out_err;
1393 1394
	}

1395 1396 1397 1398 1399
	/*
	 * Map the Hyp stack pages
	 */
	for_each_possible_cpu(cpu) {
		char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1400 1401
		err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
					  PAGE_HYP);
1402 1403 1404

		if (err) {
			kvm_err("Cannot map hyp stack\n");
1405
			goto out_err;
1406 1407 1408 1409
		}
	}

	for_each_possible_cpu(cpu) {
1410
		kvm_cpu_context_t *cpu_ctxt;
1411

1412
		cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1413
		err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
1414 1415

		if (err) {
1416
			kvm_err("Cannot map host CPU state: %d\n", err);
1417
			goto out_err;
1418 1419 1420 1421
		}
	}

	kvm_info("Hyp mode initialized successfully\n");
1422

1423
	return 0;
1424

1425
out_err:
1426
	teardown_hyp_mode();
1427 1428 1429 1430
	kvm_err("error initializing Hyp mode: %d\n", err);
	return err;
}

1431 1432 1433 1434 1435
static void check_kvm_target_cpu(void *ret)
{
	*(int *)ret = kvm_target_cpu();
}

1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448
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;
}

1449 1450 1451
/**
 * Initialize Hyp-mode and memory mappings on all CPUs.
 */
1452 1453
int kvm_arch_init(void *opaque)
{
1454
	int err;
1455
	int ret, cpu;
1456 1457 1458 1459 1460 1461

	if (!is_hyp_mode_available()) {
		kvm_err("HYP mode not available\n");
		return -ENODEV;
	}

1462 1463 1464 1465 1466 1467
	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;
		}
1468 1469
	}

1470
	err = init_common_resources();
1471
	if (err)
1472
		return err;
1473

1474 1475 1476 1477 1478
	if (is_kernel_in_hyp_mode())
		err = init_vhe_mode();
	else
		err = init_hyp_mode();
	if (err)
1479
		goto out_err;
1480

1481 1482 1483
	err = init_subsystems();
	if (err)
		goto out_hyp;
1484

1485
	return 0;
1486 1487 1488

out_hyp:
	teardown_hyp_mode();
1489
out_err:
1490
	teardown_common_resources();
1491
	return err;
1492 1493 1494 1495 1496
}

/* NOP: Compiling as a module not supported */
void kvm_arch_exit(void)
{
1497
	kvm_perf_teardown();
1498 1499 1500 1501 1502 1503 1504 1505 1506
}

static int arm_init(void)
{
	int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
	return rc;
}

module_init(arm_init);