1773 строки
38 KiB
C
1773 строки
38 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2012 - Virtual Open Systems and Columbia University
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* Author: Christoffer Dall <c.dall@virtualopensystems.com>
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*/
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#include <linux/bug.h>
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#include <linux/cpu_pm.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/kvm_host.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/mman.h>
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#include <linux/sched.h>
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#include <linux/kvm.h>
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#include <linux/kvm_irqfd.h>
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#include <linux/irqbypass.h>
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#include <linux/sched/stat.h>
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#include <trace/events/kvm.h>
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#include <kvm/arm_pmu.h>
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#include <kvm/arm_psci.h>
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#define CREATE_TRACE_POINTS
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#include "trace.h"
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#include <linux/uaccess.h>
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#include <asm/ptrace.h>
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#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/cpufeature.h>
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#include <asm/virt.h>
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#include <asm/kvm_arm.h>
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#include <asm/kvm_asm.h>
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#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/sections.h>
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#include <kvm/arm_hypercalls.h>
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#include <kvm/arm_pmu.h>
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#include <kvm/arm_psci.h>
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#ifdef REQUIRES_VIRT
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__asm__(".arch_extension virt");
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#endif
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DEFINE_PER_CPU(kvm_host_data_t, kvm_host_data);
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static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
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/* Per-CPU variable containing the currently running vcpu. */
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static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
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/* The VMID used in the VTTBR */
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static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
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static u32 kvm_next_vmid;
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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)
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{
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__this_cpu_write(kvm_arm_running_vcpu, vcpu);
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}
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DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
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/**
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* kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
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* Must be called from non-preemptible context
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*/
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struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
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{
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return __this_cpu_read(kvm_arm_running_vcpu);
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}
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/**
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* kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
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*/
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struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
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{
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return &kvm_arm_running_vcpu;
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}
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int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
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}
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int kvm_arch_hardware_setup(void)
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{
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return 0;
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}
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int kvm_arch_check_processor_compat(void)
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{
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return 0;
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}
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int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
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struct kvm_enable_cap *cap)
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{
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int r;
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if (cap->flags)
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return -EINVAL;
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switch (cap->cap) {
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case KVM_CAP_ARM_NISV_TO_USER:
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r = 0;
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kvm->arch.return_nisv_io_abort_to_user = true;
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break;
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default:
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r = -EINVAL;
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break;
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}
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return r;
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}
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/**
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* kvm_arch_init_vm - initializes a VM data structure
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* @kvm: pointer to the KVM struct
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*/
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int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
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{
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int ret, cpu;
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ret = kvm_arm_setup_stage2(kvm, type);
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if (ret)
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return ret;
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kvm->arch.last_vcpu_ran = alloc_percpu(typeof(*kvm->arch.last_vcpu_ran));
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if (!kvm->arch.last_vcpu_ran)
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return -ENOMEM;
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for_each_possible_cpu(cpu)
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*per_cpu_ptr(kvm->arch.last_vcpu_ran, cpu) = -1;
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ret = kvm_alloc_stage2_pgd(kvm);
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if (ret)
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goto out_fail_alloc;
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ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
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if (ret)
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goto out_free_stage2_pgd;
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kvm_vgic_early_init(kvm);
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/* Mark the initial VMID generation invalid */
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kvm->arch.vmid.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 ?
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kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
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return ret;
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out_free_stage2_pgd:
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kvm_free_stage2_pgd(kvm);
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out_fail_alloc:
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free_percpu(kvm->arch.last_vcpu_ran);
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kvm->arch.last_vcpu_ran = NULL;
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return ret;
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}
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int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
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{
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return 0;
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}
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vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
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{
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return VM_FAULT_SIGBUS;
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}
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/**
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* kvm_arch_destroy_vm - destroy the VM data structure
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* @kvm: pointer to the KVM struct
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*/
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void kvm_arch_destroy_vm(struct kvm *kvm)
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{
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int i;
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kvm_vgic_destroy(kvm);
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free_percpu(kvm->arch.last_vcpu_ran);
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kvm->arch.last_vcpu_ran = NULL;
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for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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if (kvm->vcpus[i]) {
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kvm_arch_vcpu_free(kvm->vcpus[i]);
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kvm->vcpus[i] = NULL;
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}
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}
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atomic_set(&kvm->online_vcpus, 0);
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}
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int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
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{
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int r;
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switch (ext) {
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case KVM_CAP_IRQCHIP:
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r = vgic_present;
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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:
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case KVM_CAP_SYNC_MMU:
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case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
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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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case KVM_CAP_VCPU_EVENTS:
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case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
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case KVM_CAP_ARM_NISV_TO_USER:
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case KVM_CAP_ARM_INJECT_EXT_DABT:
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r = 1;
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break;
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case KVM_CAP_ARM_SET_DEVICE_ADDR:
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r = 1;
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break;
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case KVM_CAP_NR_VCPUS:
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r = num_online_cpus();
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break;
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case KVM_CAP_MAX_VCPUS:
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r = KVM_MAX_VCPUS;
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break;
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case KVM_CAP_MAX_VCPU_ID:
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r = KVM_MAX_VCPU_ID;
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break;
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case KVM_CAP_MSI_DEVID:
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if (!kvm)
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r = -EINVAL;
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else
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r = kvm->arch.vgic.msis_require_devid;
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break;
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case KVM_CAP_ARM_USER_IRQ:
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/*
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* 1: EL1_VTIMER, EL1_PTIMER, and PMU.
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* (bump this number if adding more devices)
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*/
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r = 1;
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break;
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default:
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r = kvm_arch_vm_ioctl_check_extension(kvm, ext);
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break;
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}
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return r;
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}
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long kvm_arch_dev_ioctl(struct file *filp,
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unsigned int ioctl, unsigned long arg)
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{
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return -EINVAL;
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}
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struct kvm *kvm_arch_alloc_vm(void)
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{
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if (!has_vhe())
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return kzalloc(sizeof(struct kvm), GFP_KERNEL);
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return vzalloc(sizeof(struct kvm));
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}
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void kvm_arch_free_vm(struct kvm *kvm)
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{
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if (!has_vhe())
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kfree(kvm);
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else
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vfree(kvm);
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}
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struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
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{
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int err;
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struct kvm_vcpu *vcpu;
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if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
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err = -EBUSY;
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goto out;
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}
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if (id >= kvm->arch.max_vcpus) {
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err = -EINVAL;
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goto out;
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}
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vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
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if (!vcpu) {
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err = -ENOMEM;
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goto out;
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}
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err = kvm_vcpu_init(vcpu, kvm, id);
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if (err)
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goto free_vcpu;
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err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
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if (err)
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goto vcpu_uninit;
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return vcpu;
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vcpu_uninit:
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kvm_vcpu_uninit(vcpu);
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free_vcpu:
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kmem_cache_free(kvm_vcpu_cache, vcpu);
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out:
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return ERR_PTR(err);
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}
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void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
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{
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}
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void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
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{
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if (vcpu->arch.has_run_once && unlikely(!irqchip_in_kernel(vcpu->kvm)))
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static_branch_dec(&userspace_irqchip_in_use);
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kvm_mmu_free_memory_caches(vcpu);
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kvm_timer_vcpu_terminate(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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}
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void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
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{
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kvm_arch_vcpu_free(vcpu);
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}
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int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
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{
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return kvm_timer_is_pending(vcpu);
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}
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void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
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{
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/*
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* If we're about to block (most likely because we've just hit a
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* WFI), we need to sync back the state of the GIC CPU interface
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* so that we have the latest PMR and group enables. This ensures
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* that kvm_arch_vcpu_runnable has up-to-date data to decide
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* whether we have pending interrupts.
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*
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* For the same reason, we want to tell GICv4 that we need
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* doorbells to be signalled, should an interrupt become pending.
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*/
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preempt_disable();
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kvm_vgic_vmcr_sync(vcpu);
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vgic_v4_put(vcpu, true);
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preempt_enable();
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}
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void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
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{
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preempt_disable();
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vgic_v4_load(vcpu);
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preempt_enable();
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}
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int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
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{
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/* Force users to call KVM_ARM_VCPU_INIT */
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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 */
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kvm_timer_vcpu_init(vcpu);
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kvm_pmu_vcpu_init(vcpu);
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kvm_arm_reset_debug_ptr(vcpu);
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kvm_arm_pvtime_vcpu_init(&vcpu->arch);
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return kvm_vgic_vcpu_init(vcpu);
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}
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void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
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{
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int *last_ran;
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kvm_host_data_t *cpu_data;
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last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran);
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cpu_data = this_cpu_ptr(&kvm_host_data);
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/*
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* We might get preempted before the vCPU actually runs, but
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* over-invalidation doesn't affect correctness.
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*/
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if (*last_ran != vcpu->vcpu_id) {
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kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu);
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*last_ran = vcpu->vcpu_id;
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}
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vcpu->cpu = cpu;
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vcpu->arch.host_cpu_context = &cpu_data->host_ctxt;
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kvm_arm_set_running_vcpu(vcpu);
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kvm_vgic_load(vcpu);
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kvm_timer_vcpu_load(vcpu);
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kvm_vcpu_load_sysregs(vcpu);
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kvm_arch_vcpu_load_fp(vcpu);
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kvm_vcpu_pmu_restore_guest(vcpu);
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if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
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kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
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if (single_task_running())
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vcpu_clear_wfx_traps(vcpu);
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else
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vcpu_set_wfx_traps(vcpu);
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vcpu_ptrauth_setup_lazy(vcpu);
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}
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void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
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{
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kvm_arch_vcpu_put_fp(vcpu);
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kvm_vcpu_put_sysregs(vcpu);
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kvm_timer_vcpu_put(vcpu);
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kvm_vgic_put(vcpu);
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kvm_vcpu_pmu_restore_host(vcpu);
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vcpu->cpu = -1;
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kvm_arm_set_running_vcpu(NULL);
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}
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static void vcpu_power_off(struct kvm_vcpu *vcpu)
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{
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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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}
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int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
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struct kvm_mp_state *mp_state)
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{
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if (vcpu->arch.power_off)
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mp_state->mp_state = KVM_MP_STATE_STOPPED;
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else
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mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
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return 0;
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}
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int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
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struct kvm_mp_state *mp_state)
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{
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int ret = 0;
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switch (mp_state->mp_state) {
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case KVM_MP_STATE_RUNNABLE:
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vcpu->arch.power_off = false;
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break;
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case KVM_MP_STATE_STOPPED:
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vcpu_power_off(vcpu);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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/**
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* kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
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* @v: The VCPU pointer
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*
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* If the guest CPU is not waiting for interrupts or an interrupt line is
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* asserted, the CPU is by definition runnable.
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*/
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int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
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{
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bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
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return ((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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bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
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{
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return vcpu_mode_priv(vcpu);
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}
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/* Just ensure a guest exit from a particular CPU */
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static void exit_vm_noop(void *info)
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{
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}
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void force_vm_exit(const cpumask_t *mask)
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{
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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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}
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/**
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* need_new_vmid_gen - check that the VMID is still valid
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* @vmid: The VMID to check
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*
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* return true if there is a new generation of VMIDs being used
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*
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* The hardware supports a limited set of values with the value zero reserved
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* 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_vmid *vmid)
|
|
{
|
|
u64 current_vmid_gen = atomic64_read(&kvm_vmid_gen);
|
|
smp_rmb(); /* Orders read of kvm_vmid_gen and kvm->arch.vmid */
|
|
return unlikely(READ_ONCE(vmid->vmid_gen) != current_vmid_gen);
|
|
}
|
|
|
|
/**
|
|
* update_vmid - Update the vmid with a valid VMID for the current generation
|
|
* @kvm: The guest that struct vmid belongs to
|
|
* @vmid: The stage-2 VMID information struct
|
|
*/
|
|
static void update_vmid(struct kvm_vmid *vmid)
|
|
{
|
|
if (!need_new_vmid_gen(vmid))
|
|
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(vmid)) {
|
|
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);
|
|
}
|
|
|
|
vmid->vmid = kvm_next_vmid;
|
|
kvm_next_vmid++;
|
|
kvm_next_vmid &= (1 << kvm_get_vmid_bits()) - 1;
|
|
|
|
smp_wmb();
|
|
WRITE_ONCE(vmid->vmid_gen, atomic64_read(&kvm_vmid_gen));
|
|
|
|
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;
|
|
|
|
if (!kvm_arm_vcpu_is_finalized(vcpu))
|
|
return -EPERM;
|
|
|
|
vcpu->arch.has_run_once = true;
|
|
|
|
if (likely(irqchip_in_kernel(kvm))) {
|
|
/*
|
|
* Map the VGIC hardware resources before running a vcpu the
|
|
* first time on this VM.
|
|
*/
|
|
if (unlikely(!vgic_ready(kvm))) {
|
|
ret = kvm_vgic_map_resources(kvm);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
} else {
|
|
/*
|
|
* Tell the rest of the code that there are userspace irqchip
|
|
* VMs in the wild.
|
|
*/
|
|
static_branch_inc(&userspace_irqchip_in_use);
|
|
}
|
|
|
|
ret = kvm_timer_enable(vcpu);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = kvm_arm_pmu_v3_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_SLEEP);
|
|
}
|
|
|
|
void kvm_arm_resume_guest(struct kvm *kvm)
|
|
{
|
|
int i;
|
|
struct kvm_vcpu *vcpu;
|
|
|
|
kvm_for_each_vcpu(i, vcpu, kvm) {
|
|
vcpu->arch.pause = false;
|
|
swake_up_one(kvm_arch_vcpu_wq(vcpu));
|
|
}
|
|
}
|
|
|
|
static void vcpu_req_sleep(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
|
|
|
|
swait_event_interruptible_exclusive(*wq, ((!vcpu->arch.power_off) &&
|
|
(!vcpu->arch.pause)));
|
|
|
|
if (vcpu->arch.power_off || vcpu->arch.pause) {
|
|
/* Awaken to handle a signal, request we sleep again later. */
|
|
kvm_make_request(KVM_REQ_SLEEP, vcpu);
|
|
}
|
|
|
|
/*
|
|
* Make sure we will observe a potential reset request if we've
|
|
* observed a change to the power state. Pairs with the smp_wmb() in
|
|
* kvm_psci_vcpu_on().
|
|
*/
|
|
smp_rmb();
|
|
}
|
|
|
|
static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
|
|
{
|
|
return vcpu->arch.target >= 0;
|
|
}
|
|
|
|
static void check_vcpu_requests(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (kvm_request_pending(vcpu)) {
|
|
if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
|
|
vcpu_req_sleep(vcpu);
|
|
|
|
if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
|
|
kvm_reset_vcpu(vcpu);
|
|
|
|
/*
|
|
* Clear IRQ_PENDING requests that were made to guarantee
|
|
* that a VCPU sees new virtual interrupts.
|
|
*/
|
|
kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu);
|
|
|
|
if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu))
|
|
kvm_update_stolen_time(vcpu);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
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;
|
|
|
|
vcpu_load(vcpu);
|
|
|
|
kvm_sigset_activate(vcpu);
|
|
|
|
ret = 1;
|
|
run->exit_reason = KVM_EXIT_UNKNOWN;
|
|
while (ret > 0) {
|
|
/*
|
|
* Check conditions before entering the guest
|
|
*/
|
|
cond_resched();
|
|
|
|
update_vmid(&vcpu->kvm->arch.vmid);
|
|
|
|
check_vcpu_requests(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);
|
|
|
|
local_irq_disable();
|
|
|
|
kvm_vgic_flush_hwstate(vcpu);
|
|
|
|
/*
|
|
* Exit if we have a signal pending so that we can deliver the
|
|
* signal to user space.
|
|
*/
|
|
if (signal_pending(current)) {
|
|
ret = -EINTR;
|
|
run->exit_reason = KVM_EXIT_INTR;
|
|
}
|
|
|
|
/*
|
|
* If we're using a userspace irqchip, then check if we need
|
|
* to tell a userspace irqchip about timer or PMU level
|
|
* changes and if so, exit to userspace (the actual level
|
|
* state gets updated in kvm_timer_update_run and
|
|
* kvm_pmu_update_run below).
|
|
*/
|
|
if (static_branch_unlikely(&userspace_irqchip_in_use)) {
|
|
if (kvm_timer_should_notify_user(vcpu) ||
|
|
kvm_pmu_should_notify_user(vcpu)) {
|
|
ret = -EINTR;
|
|
run->exit_reason = KVM_EXIT_INTR;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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/virt/kvm/vcpu-requests.rst
|
|
*/
|
|
smp_store_mb(vcpu->mode, IN_GUEST_MODE);
|
|
|
|
if (ret <= 0 || need_new_vmid_gen(&vcpu->kvm->arch.vmid) ||
|
|
kvm_request_pending(vcpu)) {
|
|
vcpu->mode = OUTSIDE_GUEST_MODE;
|
|
isb(); /* Ensure work in x_flush_hwstate is committed */
|
|
kvm_pmu_sync_hwstate(vcpu);
|
|
if (static_branch_unlikely(&userspace_irqchip_in_use))
|
|
kvm_timer_sync_hwstate(vcpu);
|
|
kvm_vgic_sync_hwstate(vcpu);
|
|
local_irq_enable();
|
|
preempt_enable();
|
|
continue;
|
|
}
|
|
|
|
kvm_arm_setup_debug(vcpu);
|
|
|
|
/**************************************************************
|
|
* Enter the guest
|
|
*/
|
|
trace_kvm_entry(*vcpu_pc(vcpu));
|
|
guest_enter_irqoff();
|
|
|
|
if (has_vhe()) {
|
|
kvm_arm_vhe_guest_enter();
|
|
ret = kvm_vcpu_run_vhe(vcpu);
|
|
kvm_arm_vhe_guest_exit();
|
|
} else {
|
|
ret = kvm_call_hyp_ret(__kvm_vcpu_run_nvhe, vcpu);
|
|
}
|
|
|
|
vcpu->mode = OUTSIDE_GUEST_MODE;
|
|
vcpu->stat.exits++;
|
|
/*
|
|
* Back from guest
|
|
*************************************************************/
|
|
|
|
kvm_arm_clear_debug(vcpu);
|
|
|
|
/*
|
|
* We must sync the PMU state before the vgic state so
|
|
* that the vgic can properly sample the updated state of the
|
|
* interrupt line.
|
|
*/
|
|
kvm_pmu_sync_hwstate(vcpu);
|
|
|
|
/*
|
|
* Sync the vgic state before syncing the timer state because
|
|
* the timer code needs to know if the virtual timer
|
|
* interrupts are active.
|
|
*/
|
|
kvm_vgic_sync_hwstate(vcpu);
|
|
|
|
/*
|
|
* Sync the timer hardware state before enabling interrupts as
|
|
* we don't want vtimer interrupts to race with syncing the
|
|
* timer virtual interrupt state.
|
|
*/
|
|
if (static_branch_unlikely(&userspace_irqchip_in_use))
|
|
kvm_timer_sync_hwstate(vcpu);
|
|
|
|
kvm_arch_vcpu_ctxsync_fp(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));
|
|
|
|
/* Exit types that need handling before we can be preempted */
|
|
handle_exit_early(vcpu, run, ret);
|
|
|
|
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);
|
|
}
|
|
|
|
kvm_sigset_deactivate(vcpu);
|
|
|
|
vcpu_put(vcpu);
|
|
return ret;
|
|
}
|
|
|
|
static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
|
|
{
|
|
int bit_index;
|
|
bool set;
|
|
unsigned long *hcr;
|
|
|
|
if (number == KVM_ARM_IRQ_CPU_IRQ)
|
|
bit_index = __ffs(HCR_VI);
|
|
else /* KVM_ARM_IRQ_CPU_FIQ */
|
|
bit_index = __ffs(HCR_VF);
|
|
|
|
hcr = vcpu_hcr(vcpu);
|
|
if (level)
|
|
set = test_and_set_bit(bit_index, hcr);
|
|
else
|
|
set = test_and_clear_bit(bit_index, hcr);
|
|
|
|
/*
|
|
* 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_make_request(KVM_REQ_IRQ_PENDING, vcpu);
|
|
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;
|
|
vcpu_idx += ((irq >> KVM_ARM_IRQ_VCPU2_SHIFT) & KVM_ARM_IRQ_VCPU2_MASK) * (KVM_ARM_IRQ_VCPU_MASK + 1);
|
|
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, NULL);
|
|
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, NULL);
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
|
|
const struct kvm_vcpu_init *init)
|
|
{
|
|
unsigned int i, ret;
|
|
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. */
|
|
ret = kvm_reset_vcpu(vcpu);
|
|
if (ret) {
|
|
vcpu->arch.target = -1;
|
|
bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
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_power_off(vcpu);
|
|
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;
|
|
}
|
|
|
|
static int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
|
|
struct kvm_vcpu_events *events)
|
|
{
|
|
memset(events, 0, sizeof(*events));
|
|
|
|
return __kvm_arm_vcpu_get_events(vcpu, events);
|
|
}
|
|
|
|
static int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
|
|
struct kvm_vcpu_events *events)
|
|
{
|
|
int i;
|
|
|
|
/* check whether the reserved field is zero */
|
|
for (i = 0; i < ARRAY_SIZE(events->reserved); i++)
|
|
if (events->reserved[i])
|
|
return -EINVAL;
|
|
|
|
/* check whether the pad field is zero */
|
|
for (i = 0; i < ARRAY_SIZE(events->exception.pad); i++)
|
|
if (events->exception.pad[i])
|
|
return -EINVAL;
|
|
|
|
return __kvm_arm_vcpu_set_events(vcpu, events);
|
|
}
|
|
|
|
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;
|
|
long r;
|
|
|
|
switch (ioctl) {
|
|
case KVM_ARM_VCPU_INIT: {
|
|
struct kvm_vcpu_init init;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&init, argp, sizeof(init)))
|
|
break;
|
|
|
|
r = kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
|
|
break;
|
|
}
|
|
case KVM_SET_ONE_REG:
|
|
case KVM_GET_ONE_REG: {
|
|
struct kvm_one_reg reg;
|
|
|
|
r = -ENOEXEC;
|
|
if (unlikely(!kvm_vcpu_initialized(vcpu)))
|
|
break;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(®, argp, sizeof(reg)))
|
|
break;
|
|
|
|
if (ioctl == KVM_SET_ONE_REG)
|
|
r = kvm_arm_set_reg(vcpu, ®);
|
|
else
|
|
r = kvm_arm_get_reg(vcpu, ®);
|
|
break;
|
|
}
|
|
case KVM_GET_REG_LIST: {
|
|
struct kvm_reg_list __user *user_list = argp;
|
|
struct kvm_reg_list reg_list;
|
|
unsigned n;
|
|
|
|
r = -ENOEXEC;
|
|
if (unlikely(!kvm_vcpu_initialized(vcpu)))
|
|
break;
|
|
|
|
r = -EPERM;
|
|
if (!kvm_arm_vcpu_is_finalized(vcpu))
|
|
break;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(®_list, user_list, sizeof(reg_list)))
|
|
break;
|
|
n = reg_list.n;
|
|
reg_list.n = kvm_arm_num_regs(vcpu);
|
|
if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
|
|
break;
|
|
r = -E2BIG;
|
|
if (n < reg_list.n)
|
|
break;
|
|
r = kvm_arm_copy_reg_indices(vcpu, user_list->reg);
|
|
break;
|
|
}
|
|
case KVM_SET_DEVICE_ATTR: {
|
|
r = -EFAULT;
|
|
if (copy_from_user(&attr, argp, sizeof(attr)))
|
|
break;
|
|
r = kvm_arm_vcpu_set_attr(vcpu, &attr);
|
|
break;
|
|
}
|
|
case KVM_GET_DEVICE_ATTR: {
|
|
r = -EFAULT;
|
|
if (copy_from_user(&attr, argp, sizeof(attr)))
|
|
break;
|
|
r = kvm_arm_vcpu_get_attr(vcpu, &attr);
|
|
break;
|
|
}
|
|
case KVM_HAS_DEVICE_ATTR: {
|
|
r = -EFAULT;
|
|
if (copy_from_user(&attr, argp, sizeof(attr)))
|
|
break;
|
|
r = kvm_arm_vcpu_has_attr(vcpu, &attr);
|
|
break;
|
|
}
|
|
case KVM_GET_VCPU_EVENTS: {
|
|
struct kvm_vcpu_events events;
|
|
|
|
if (kvm_arm_vcpu_get_events(vcpu, &events))
|
|
return -EINVAL;
|
|
|
|
if (copy_to_user(argp, &events, sizeof(events)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
case KVM_SET_VCPU_EVENTS: {
|
|
struct kvm_vcpu_events events;
|
|
|
|
if (copy_from_user(&events, argp, sizeof(events)))
|
|
return -EFAULT;
|
|
|
|
return kvm_arm_vcpu_set_events(vcpu, &events);
|
|
}
|
|
case KVM_ARM_VCPU_FINALIZE: {
|
|
int what;
|
|
|
|
if (!kvm_vcpu_initialized(vcpu))
|
|
return -ENOEXEC;
|
|
|
|
if (get_user(what, (const int __user *)argp))
|
|
return -EFAULT;
|
|
|
|
return kvm_arm_vcpu_finalize(vcpu, what);
|
|
}
|
|
default:
|
|
r = -EINVAL;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* 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 flush = false;
|
|
int r;
|
|
|
|
mutex_lock(&kvm->slots_lock);
|
|
|
|
r = kvm_get_dirty_log_protect(kvm, log, &flush);
|
|
|
|
if (flush)
|
|
kvm_flush_remote_tlbs(kvm);
|
|
|
|
mutex_unlock(&kvm->slots_lock);
|
|
return r;
|
|
}
|
|
|
|
int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm, struct kvm_clear_dirty_log *log)
|
|
{
|
|
bool flush = false;
|
|
int r;
|
|
|
|
mutex_lock(&kvm->slots_lock);
|
|
|
|
r = kvm_clear_dirty_log_protect(kvm, log, &flush);
|
|
|
|
if (flush)
|
|
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_get_hyp_vector();
|
|
|
|
__cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
|
|
__cpu_init_stage2();
|
|
}
|
|
|
|
static void cpu_hyp_reset(void)
|
|
{
|
|
if (!is_kernel_in_hyp_mode())
|
|
__hyp_reset_vectors();
|
|
}
|
|
|
|
static void cpu_hyp_reinit(void)
|
|
{
|
|
kvm_init_host_cpu_context(&this_cpu_ptr(&kvm_host_data)->host_ctxt);
|
|
|
|
cpu_hyp_reset();
|
|
|
|
if (is_kernel_in_hyp_mode())
|
|
kvm_timer_init_vhe();
|
|
else
|
|
cpu_init_hyp_mode(NULL);
|
|
|
|
kvm_arm_init_debug();
|
|
|
|
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_ENTER_FAILED:
|
|
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 int init_common_resources(void)
|
|
{
|
|
kvm_set_ipa_limit();
|
|
|
|
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(vgic_present);
|
|
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;
|
|
|
|
free_hyp_pgds();
|
|
for_each_possible_cpu(cpu)
|
|
free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
|
|
hyp_cpu_pm_exit();
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
err = kvm_map_vectors();
|
|
if (err) {
|
|
kvm_err("Cannot map vectors\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_host_data_t *cpu_data;
|
|
|
|
cpu_data = per_cpu_ptr(&kvm_host_data, cpu);
|
|
err = create_hyp_mappings(cpu_data, cpu_data + 1, PAGE_HYP);
|
|
|
|
if (err) {
|
|
kvm_err("Cannot map host CPU state: %d\n", err);
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
err = hyp_map_aux_data();
|
|
if (err)
|
|
kvm_err("Cannot map host auxiliary data: %d\n", err);
|
|
|
|
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;
|
|
}
|
|
|
|
bool kvm_arch_has_irq_bypass(void)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
|
|
struct irq_bypass_producer *prod)
|
|
{
|
|
struct kvm_kernel_irqfd *irqfd =
|
|
container_of(cons, struct kvm_kernel_irqfd, consumer);
|
|
|
|
return kvm_vgic_v4_set_forwarding(irqfd->kvm, prod->irq,
|
|
&irqfd->irq_entry);
|
|
}
|
|
void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
|
|
struct irq_bypass_producer *prod)
|
|
{
|
|
struct kvm_kernel_irqfd *irqfd =
|
|
container_of(cons, struct kvm_kernel_irqfd, consumer);
|
|
|
|
kvm_vgic_v4_unset_forwarding(irqfd->kvm, prod->irq,
|
|
&irqfd->irq_entry);
|
|
}
|
|
|
|
void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons)
|
|
{
|
|
struct kvm_kernel_irqfd *irqfd =
|
|
container_of(cons, struct kvm_kernel_irqfd, consumer);
|
|
|
|
kvm_arm_halt_guest(irqfd->kvm);
|
|
}
|
|
|
|
void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
|
|
{
|
|
struct kvm_kernel_irqfd *irqfd =
|
|
container_of(cons, struct kvm_kernel_irqfd, consumer);
|
|
|
|
kvm_arm_resume_guest(irqfd->kvm);
|
|
}
|
|
|
|
/**
|
|
* Initialize Hyp-mode and memory mappings on all CPUs.
|
|
*/
|
|
int kvm_arch_init(void *opaque)
|
|
{
|
|
int err;
|
|
int ret, cpu;
|
|
bool in_hyp_mode;
|
|
|
|
if (!is_hyp_mode_available()) {
|
|
kvm_info("HYP mode not available\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
in_hyp_mode = is_kernel_in_hyp_mode();
|
|
|
|
if (!in_hyp_mode && kvm_arch_requires_vhe()) {
|
|
kvm_pr_unimpl("CPU unsupported in non-VHE mode, not initializing\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;
|
|
|
|
err = kvm_arm_init_sve();
|
|
if (err)
|
|
return err;
|
|
|
|
if (!in_hyp_mode) {
|
|
err = init_hyp_mode();
|
|
if (err)
|
|
goto out_err;
|
|
}
|
|
|
|
err = init_subsystems();
|
|
if (err)
|
|
goto out_hyp;
|
|
|
|
if (in_hyp_mode)
|
|
kvm_info("VHE mode initialized successfully\n");
|
|
else
|
|
kvm_info("Hyp mode initialized successfully\n");
|
|
|
|
return 0;
|
|
|
|
out_hyp:
|
|
if (!in_hyp_mode)
|
|
teardown_hyp_mode();
|
|
out_err:
|
|
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);
|