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-rw-r--r--arch/arm/kvm/arm.c1480
1 files changed, 0 insertions, 1480 deletions
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
deleted file mode 100644
index 8a31906bdc9b..000000000000
--- a/arch/arm/kvm/arm.c
+++ /dev/null
@@ -1,1480 +0,0 @@
-/*
- * Copyright (C) 2012 - Virtual Open Systems and Columbia University
- * Author: Christoffer Dall <c.dall@virtualopensystems.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2, as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
-
-#include <linux/cpu_pm.h>
-#include <linux/errno.h>
-#include <linux/err.h>
-#include <linux/kvm_host.h>
-#include <linux/list.h>
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/fs.h>
-#include <linux/mman.h>
-#include <linux/sched.h>
-#include <linux/kvm.h>
-#include <trace/events/kvm.h>
-#include <kvm/arm_pmu.h>
-
-#define CREATE_TRACE_POINTS
-#include "trace.h"
-
-#include <linux/uaccess.h>
-#include <asm/ptrace.h>
-#include <asm/mman.h>
-#include <asm/tlbflush.h>
-#include <asm/cacheflush.h>
-#include <asm/virt.h>
-#include <asm/kvm_arm.h>
-#include <asm/kvm_asm.h>
-#include <asm/kvm_mmu.h>
-#include <asm/kvm_emulate.h>
-#include <asm/kvm_coproc.h>
-#include <asm/kvm_psci.h>
-#include <asm/sections.h>
-
-#ifdef REQUIRES_VIRT
-__asm__(".arch_extension virt");
-#endif
-
-static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
-static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
-
-/* Per-CPU variable containing the currently running vcpu. */
-static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
-
-/* The VMID used in the VTTBR */
-static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
-static u32 kvm_next_vmid;
-static unsigned int kvm_vmid_bits __read_mostly;
-static DEFINE_SPINLOCK(kvm_vmid_lock);
-
-static bool vgic_present;
-
-static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
-
-static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
-{
- BUG_ON(preemptible());
- __this_cpu_write(kvm_arm_running_vcpu, vcpu);
-}
-
-/**
- * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
- * Must be called from non-preemptible context
- */
-struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
-{
- BUG_ON(preemptible());
- return __this_cpu_read(kvm_arm_running_vcpu);
-}
-
-/**
- * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
- */
-struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
-{
- return &kvm_arm_running_vcpu;
-}
-
-int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
-{
- return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
-}
-
-int kvm_arch_hardware_setup(void)
-{
- return 0;
-}
-
-void kvm_arch_check_processor_compat(void *rtn)
-{
- *(int *)rtn = 0;
-}
-
-
-/**
- * kvm_arch_init_vm - initializes a VM data structure
- * @kvm: pointer to the KVM struct
- */
-int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
-{
- int ret, cpu;
-
- if (type)
- return -EINVAL;
-
- kvm->arch.last_vcpu_ran = alloc_percpu(typeof(*kvm->arch.last_vcpu_ran));
- if (!kvm->arch.last_vcpu_ran)
- return -ENOMEM;
-
- for_each_possible_cpu(cpu)
- *per_cpu_ptr(kvm->arch.last_vcpu_ran, cpu) = -1;
-
- ret = kvm_alloc_stage2_pgd(kvm);
- if (ret)
- goto out_fail_alloc;
-
- ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
- if (ret)
- goto out_free_stage2_pgd;
-
- kvm_vgic_early_init(kvm);
-
- /* Mark the initial VMID generation invalid */
- kvm->arch.vmid_gen = 0;
-
- /* The maximum number of VCPUs is limited by the host's GIC model */
- kvm->arch.max_vcpus = vgic_present ?
- kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
-
- return ret;
-out_free_stage2_pgd:
- kvm_free_stage2_pgd(kvm);
-out_fail_alloc:
- free_percpu(kvm->arch.last_vcpu_ran);
- kvm->arch.last_vcpu_ran = NULL;
- return ret;
-}
-
-bool kvm_arch_has_vcpu_debugfs(void)
-{
- return false;
-}
-
-int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
-{
- return 0;
-}
-
-int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
-{
- return VM_FAULT_SIGBUS;
-}
-
-
-/**
- * kvm_arch_destroy_vm - destroy the VM data structure
- * @kvm: pointer to the KVM struct
- */
-void kvm_arch_destroy_vm(struct kvm *kvm)
-{
- int i;
-
- free_percpu(kvm->arch.last_vcpu_ran);
- kvm->arch.last_vcpu_ran = NULL;
-
- for (i = 0; i < KVM_MAX_VCPUS; ++i) {
- if (kvm->vcpus[i]) {
- kvm_arch_vcpu_free(kvm->vcpus[i]);
- kvm->vcpus[i] = NULL;
- }
- }
-
- kvm_vgic_destroy(kvm);
-}
-
-int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
-{
- int r;
- switch (ext) {
- case KVM_CAP_IRQCHIP:
- r = vgic_present;
- break;
- case KVM_CAP_IOEVENTFD:
- case KVM_CAP_DEVICE_CTRL:
- case KVM_CAP_USER_MEMORY:
- case KVM_CAP_SYNC_MMU:
- case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
- case KVM_CAP_ONE_REG:
- case KVM_CAP_ARM_PSCI:
- case KVM_CAP_ARM_PSCI_0_2:
- case KVM_CAP_READONLY_MEM:
- case KVM_CAP_MP_STATE:
- case KVM_CAP_IMMEDIATE_EXIT:
- r = 1;
- break;
- case KVM_CAP_ARM_SET_DEVICE_ADDR:
- r = 1;
- break;
- case KVM_CAP_NR_VCPUS:
- r = num_online_cpus();
- break;
- case KVM_CAP_MAX_VCPUS:
- r = KVM_MAX_VCPUS;
- break;
- case KVM_CAP_NR_MEMSLOTS:
- r = KVM_USER_MEM_SLOTS;
- break;
- case KVM_CAP_MSI_DEVID:
- if (!kvm)
- r = -EINVAL;
- else
- r = kvm->arch.vgic.msis_require_devid;
- break;
- case KVM_CAP_ARM_USER_IRQ:
- /*
- * 1: EL1_VTIMER, EL1_PTIMER, and PMU.
- * (bump this number if adding more devices)
- */
- r = 1;
- break;
- default:
- r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
- break;
- }
- return r;
-}
-
-long kvm_arch_dev_ioctl(struct file *filp,
- unsigned int ioctl, unsigned long arg)
-{
- return -EINVAL;
-}
-
-
-struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
-{
- int err;
- struct kvm_vcpu *vcpu;
-
- if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
- err = -EBUSY;
- goto out;
- }
-
- if (id >= kvm->arch.max_vcpus) {
- err = -EINVAL;
- goto out;
- }
-
- vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
- if (!vcpu) {
- err = -ENOMEM;
- goto out;
- }
-
- err = kvm_vcpu_init(vcpu, kvm, id);
- if (err)
- goto free_vcpu;
-
- err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
- if (err)
- goto vcpu_uninit;
-
- return vcpu;
-vcpu_uninit:
- kvm_vcpu_uninit(vcpu);
-free_vcpu:
- kmem_cache_free(kvm_vcpu_cache, vcpu);
-out:
- return ERR_PTR(err);
-}
-
-void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
-{
- kvm_vgic_vcpu_early_init(vcpu);
-}
-
-void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
-{
- kvm_mmu_free_memory_caches(vcpu);
- kvm_timer_vcpu_terminate(vcpu);
- kvm_vgic_vcpu_destroy(vcpu);
- kvm_pmu_vcpu_destroy(vcpu);
- kvm_vcpu_uninit(vcpu);
- kmem_cache_free(kvm_vcpu_cache, vcpu);
-}
-
-void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
-{
- kvm_arch_vcpu_free(vcpu);
-}
-
-int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
-{
- return kvm_timer_should_fire(vcpu_vtimer(vcpu)) ||
- kvm_timer_should_fire(vcpu_ptimer(vcpu));
-}
-
-void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
-{
- kvm_timer_schedule(vcpu);
-}
-
-void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
-{
- kvm_timer_unschedule(vcpu);
-}
-
-int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
-{
- /* Force users to call KVM_ARM_VCPU_INIT */
- vcpu->arch.target = -1;
- bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
-
- /* Set up the timer */
- kvm_timer_vcpu_init(vcpu);
-
- kvm_arm_reset_debug_ptr(vcpu);
-
- return 0;
-}
-
-void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
-{
- int *last_ran;
-
- last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran);
-
- /*
- * We might get preempted before the vCPU actually runs, but
- * over-invalidation doesn't affect correctness.
- */
- if (*last_ran != vcpu->vcpu_id) {
- kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu);
- *last_ran = vcpu->vcpu_id;
- }
-
- vcpu->cpu = cpu;
- vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
-
- kvm_arm_set_running_vcpu(vcpu);
-
- kvm_vgic_load(vcpu);
-}
-
-void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
-{
- kvm_vgic_put(vcpu);
-
- vcpu->cpu = -1;
-
- kvm_arm_set_running_vcpu(NULL);
- kvm_timer_vcpu_put(vcpu);
-}
-
-int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
- struct kvm_mp_state *mp_state)
-{
- if (vcpu->arch.power_off)
- mp_state->mp_state = KVM_MP_STATE_STOPPED;
- else
- mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
-
- return 0;
-}
-
-int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
- struct kvm_mp_state *mp_state)
-{
- switch (mp_state->mp_state) {
- case KVM_MP_STATE_RUNNABLE:
- vcpu->arch.power_off = false;
- break;
- case KVM_MP_STATE_STOPPED:
- vcpu->arch.power_off = true;
- break;
- default:
- return -EINVAL;
- }
-
- return 0;
-}
-
-/**
- * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
- * @v: The VCPU pointer
- *
- * If the guest CPU is not waiting for interrupts or an interrupt line is
- * asserted, the CPU is by definition runnable.
- */
-int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
-{
- return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
- && !v->arch.power_off && !v->arch.pause);
-}
-
-/* Just ensure a guest exit from a particular CPU */
-static void exit_vm_noop(void *info)
-{
-}
-
-void force_vm_exit(const cpumask_t *mask)
-{
- preempt_disable();
- smp_call_function_many(mask, exit_vm_noop, NULL, true);
- preempt_enable();
-}
-
-/**
- * need_new_vmid_gen - check that the VMID is still valid
- * @kvm: The VM's VMID to check
- *
- * return true if there is a new generation of VMIDs being used
- *
- * The hardware supports only 256 values with the value zero reserved for the
- * host, so we check if an assigned value belongs to a previous generation,
- * which which requires us to assign a new value. If we're the first to use a
- * VMID for the new generation, we must flush necessary caches and TLBs on all
- * CPUs.
- */
-static bool need_new_vmid_gen(struct kvm *kvm)
-{
- return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
-}
-
-/**
- * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
- * @kvm The guest that we are about to run
- *
- * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
- * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
- * caches and TLBs.
- */
-static void update_vttbr(struct kvm *kvm)
-{
- phys_addr_t pgd_phys;
- u64 vmid;
-
- if (!need_new_vmid_gen(kvm))
- return;
-
- spin_lock(&kvm_vmid_lock);
-
- /*
- * We need to re-check the vmid_gen here to ensure that if another vcpu
- * already allocated a valid vmid for this vm, then this vcpu should
- * use the same vmid.
- */
- if (!need_new_vmid_gen(kvm)) {
- spin_unlock(&kvm_vmid_lock);
- return;
- }
-
- /* First user of a new VMID generation? */
- if (unlikely(kvm_next_vmid == 0)) {
- atomic64_inc(&kvm_vmid_gen);
- kvm_next_vmid = 1;
-
- /*
- * On SMP we know no other CPUs can use this CPU's or each
- * other's VMID after force_vm_exit returns since the
- * kvm_vmid_lock blocks them from reentry to the guest.
- */
- force_vm_exit(cpu_all_mask);
- /*
- * Now broadcast TLB + ICACHE invalidation over the inner
- * shareable domain to make sure all data structures are
- * clean.
- */
- kvm_call_hyp(__kvm_flush_vm_context);
- }
-
- kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
- kvm->arch.vmid = kvm_next_vmid;
- kvm_next_vmid++;
- kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
-
- /* update vttbr to be used with the new vmid */
- pgd_phys = virt_to_phys(kvm->arch.pgd);
- BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
- vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
- kvm->arch.vttbr = pgd_phys | vmid;
-
- spin_unlock(&kvm_vmid_lock);
-}
-
-static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
-{
- struct kvm *kvm = vcpu->kvm;
- int ret = 0;
-
- if (likely(vcpu->arch.has_run_once))
- return 0;
-
- vcpu->arch.has_run_once = true;
-
- /*
- * Map the VGIC hardware resources before running a vcpu the first
- * time on this VM.
- */
- if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
- ret = kvm_vgic_map_resources(kvm);
- if (ret)
- return ret;
- }
-
- ret = kvm_timer_enable(vcpu);
-
- return ret;
-}
-
-bool kvm_arch_intc_initialized(struct kvm *kvm)
-{
- return vgic_initialized(kvm);
-}
-
-void kvm_arm_halt_guest(struct kvm *kvm)
-{
- int i;
- struct kvm_vcpu *vcpu;
-
- kvm_for_each_vcpu(i, vcpu, kvm)
- vcpu->arch.pause = true;
- kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
-}
-
-void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
-{
- vcpu->arch.pause = true;
- kvm_vcpu_kick(vcpu);
-}
-
-void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
-{
- struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
-
- vcpu->arch.pause = false;
- swake_up(wq);
-}
-
-void kvm_arm_resume_guest(struct kvm *kvm)
-{
- int i;
- struct kvm_vcpu *vcpu;
-
- kvm_for_each_vcpu(i, vcpu, kvm)
- kvm_arm_resume_vcpu(vcpu);
-}
-
-static void vcpu_sleep(struct kvm_vcpu *vcpu)
-{
- struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
-
- swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
- (!vcpu->arch.pause)));
-}
-
-static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
-{
- return vcpu->arch.target >= 0;
-}
-
-/**
- * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
- * @vcpu: The VCPU pointer
- * @run: The kvm_run structure pointer used for userspace state exchange
- *
- * This function is called through the VCPU_RUN ioctl called from user space. It
- * will execute VM code in a loop until the time slice for the process is used
- * or some emulation is needed from user space in which case the function will
- * return with return value 0 and with the kvm_run structure filled in with the
- * required data for the requested emulation.
- */
-int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
-{
- int ret;
- sigset_t sigsaved;
-
- if (unlikely(!kvm_vcpu_initialized(vcpu)))
- return -ENOEXEC;
-
- ret = kvm_vcpu_first_run_init(vcpu);
- if (ret)
- return ret;
-
- if (run->exit_reason == KVM_EXIT_MMIO) {
- ret = kvm_handle_mmio_return(vcpu, vcpu->run);
- if (ret)
- return ret;
- }
-
- if (run->immediate_exit)
- return -EINTR;
-
- if (vcpu->sigset_active)
- sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
-
- ret = 1;
- run->exit_reason = KVM_EXIT_UNKNOWN;
- while (ret > 0) {
- /*
- * Check conditions before entering the guest
- */
- cond_resched();
-
- update_vttbr(vcpu->kvm);
-
- if (vcpu->arch.power_off || vcpu->arch.pause)
- vcpu_sleep(vcpu);
-
- /*
- * Preparing the interrupts to be injected also
- * involves poking the GIC, which must be done in a
- * non-preemptible context.
- */
- preempt_disable();
-
- kvm_pmu_flush_hwstate(vcpu);
-
- kvm_timer_flush_hwstate(vcpu);
- kvm_vgic_flush_hwstate(vcpu);
-
- local_irq_disable();
-
- /*
- * If we have a singal pending, or need to notify a userspace
- * irqchip about timer or PMU level changes, then we exit (and
- * update the timer level state in kvm_timer_update_run
- * below).
- */
- if (signal_pending(current) ||
- kvm_timer_should_notify_user(vcpu) ||
- kvm_pmu_should_notify_user(vcpu)) {
- ret = -EINTR;
- run->exit_reason = KVM_EXIT_INTR;
- }
-
- if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
- vcpu->arch.power_off || vcpu->arch.pause) {
- local_irq_enable();
- kvm_pmu_sync_hwstate(vcpu);
- kvm_timer_sync_hwstate(vcpu);
- kvm_vgic_sync_hwstate(vcpu);
- preempt_enable();
- continue;
- }
-
- kvm_arm_setup_debug(vcpu);
-
- /**************************************************************
- * Enter the guest
- */
- trace_kvm_entry(*vcpu_pc(vcpu));
- guest_enter_irqoff();
- vcpu->mode = IN_GUEST_MODE;
-
- ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
-
- vcpu->mode = OUTSIDE_GUEST_MODE;
- vcpu->stat.exits++;
- /*
- * Back from guest
- *************************************************************/
-
- kvm_arm_clear_debug(vcpu);
-
- /*
- * We may have taken a host interrupt in HYP mode (ie
- * while executing the guest). This interrupt is still
- * pending, as we haven't serviced it yet!
- *
- * We're now back in SVC mode, with interrupts
- * disabled. Enabling the interrupts now will have
- * the effect of taking the interrupt again, in SVC
- * mode this time.
- */
- local_irq_enable();
-
- /*
- * We do local_irq_enable() before calling guest_exit() so
- * that if a timer interrupt hits while running the guest we
- * account that tick as being spent in the guest. We enable
- * preemption after calling guest_exit() so that if we get
- * preempted we make sure ticks after that is not counted as
- * guest time.
- */
- guest_exit();
- trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
-
- /*
- * We must sync the PMU and timer state before the vgic state so
- * that the vgic can properly sample the updated state of the
- * interrupt line.
- */
- kvm_pmu_sync_hwstate(vcpu);
- kvm_timer_sync_hwstate(vcpu);
-
- kvm_vgic_sync_hwstate(vcpu);
-
- preempt_enable();
-
- ret = handle_exit(vcpu, run, ret);
- }
-
- /* Tell userspace about in-kernel device output levels */
- if (unlikely(!irqchip_in_kernel(vcpu->kvm))) {
- kvm_timer_update_run(vcpu);
- kvm_pmu_update_run(vcpu);
- }
-
- if (vcpu->sigset_active)
- sigprocmask(SIG_SETMASK, &sigsaved, NULL);
- return ret;
-}
-
-static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
-{
- int bit_index;
- bool set;
- unsigned long *ptr;
-
- if (number == KVM_ARM_IRQ_CPU_IRQ)
- bit_index = __ffs(HCR_VI);
- else /* KVM_ARM_IRQ_CPU_FIQ */
- bit_index = __ffs(HCR_VF);
-
- ptr = (unsigned long *)&vcpu->arch.irq_lines;
- if (level)
- set = test_and_set_bit(bit_index, ptr);
- else
- set = test_and_clear_bit(bit_index, ptr);
-
- /*
- * If we didn't change anything, no need to wake up or kick other CPUs
- */
- if (set == level)
- return 0;
-
- /*
- * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
- * trigger a world-switch round on the running physical CPU to set the
- * virtual IRQ/FIQ fields in the HCR appropriately.
- */
- kvm_vcpu_kick(vcpu);
-
- return 0;
-}
-
-int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
- bool line_status)
-{
- u32 irq = irq_level->irq;
- unsigned int irq_type, vcpu_idx, irq_num;
- int nrcpus = atomic_read(&kvm->online_vcpus);
- struct kvm_vcpu *vcpu = NULL;
- bool level = irq_level->level;
-
- irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
- vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
- irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
-
- trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
-
- switch (irq_type) {
- case KVM_ARM_IRQ_TYPE_CPU:
- if (irqchip_in_kernel(kvm))
- return -ENXIO;
-
- if (vcpu_idx >= nrcpus)
- return -EINVAL;
-
- vcpu = kvm_get_vcpu(kvm, vcpu_idx);
- if (!vcpu)
- return -EINVAL;
-
- if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
- return -EINVAL;
-
- return vcpu_interrupt_line(vcpu, irq_num, level);
- case KVM_ARM_IRQ_TYPE_PPI:
- if (!irqchip_in_kernel(kvm))
- return -ENXIO;
-
- if (vcpu_idx >= nrcpus)
- return -EINVAL;
-
- vcpu = kvm_get_vcpu(kvm, vcpu_idx);
- if (!vcpu)
- return -EINVAL;
-
- if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
- return -EINVAL;
-
- return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
- case KVM_ARM_IRQ_TYPE_SPI:
- if (!irqchip_in_kernel(kvm))
- return -ENXIO;
-
- if (irq_num < VGIC_NR_PRIVATE_IRQS)
- return -EINVAL;
-
- return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
- }
-
- return -EINVAL;
-}
-
-static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
- const struct kvm_vcpu_init *init)
-{
- unsigned int i;
- int phys_target = kvm_target_cpu();
-
- if (init->target != phys_target)
- return -EINVAL;
-
- /*
- * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
- * use the same target.
- */
- if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
- return -EINVAL;
-
- /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
- for (i = 0; i < sizeof(init->features) * 8; i++) {
- bool set = (init->features[i / 32] & (1 << (i % 32)));
-
- if (set && i >= KVM_VCPU_MAX_FEATURES)
- return -ENOENT;
-
- /*
- * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
- * use the same feature set.
- */
- if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
- test_bit(i, vcpu->arch.features) != set)
- return -EINVAL;
-
- if (set)
- set_bit(i, vcpu->arch.features);
- }
-
- vcpu->arch.target = phys_target;
-
- /* Now we know what it is, we can reset it. */
- return kvm_reset_vcpu(vcpu);
-}
-
-
-static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
- struct kvm_vcpu_init *init)
-{
- int ret;
-
- ret = kvm_vcpu_set_target(vcpu, init);
- if (ret)
- return ret;
-
- /*
- * Ensure a rebooted VM will fault in RAM pages and detect if the
- * guest MMU is turned off and flush the caches as needed.
- */
- if (vcpu->arch.has_run_once)
- stage2_unmap_vm(vcpu->kvm);
-
- vcpu_reset_hcr(vcpu);
-
- /*
- * Handle the "start in power-off" case.
- */
- if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
- vcpu->arch.power_off = true;
- else
- vcpu->arch.power_off = false;
-
- return 0;
-}
-
-static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
- struct kvm_device_attr *attr)
-{
- int ret = -ENXIO;
-
- switch (attr->group) {
- default:
- ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
- break;
- }
-
- return ret;
-}
-
-static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
- struct kvm_device_attr *attr)
-{
- int ret = -ENXIO;
-
- switch (attr->group) {
- default:
- ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
- break;
- }
-
- return ret;
-}
-
-static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
- struct kvm_device_attr *attr)
-{
- int ret = -ENXIO;
-
- switch (attr->group) {
- default:
- ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
- break;
- }
-
- return ret;
-}
-
-long kvm_arch_vcpu_ioctl(struct file *filp,
- unsigned int ioctl, unsigned long arg)
-{
- struct kvm_vcpu *vcpu = filp->private_data;
- void __user *argp = (void __user *)arg;
- struct kvm_device_attr attr;
-
- switch (ioctl) {
- case KVM_ARM_VCPU_INIT: {
- struct kvm_vcpu_init init;
-
- if (copy_from_user(&init, argp, sizeof(init)))
- return -EFAULT;
-
- return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
- }
- case KVM_SET_ONE_REG:
- case KVM_GET_ONE_REG: {
- struct kvm_one_reg reg;
-
- if (unlikely(!kvm_vcpu_initialized(vcpu)))
- return -ENOEXEC;
-
- if (copy_from_user(&reg, argp, sizeof(reg)))
- return -EFAULT;
- if (ioctl == KVM_SET_ONE_REG)
- return kvm_arm_set_reg(vcpu, &reg);
- else
- return kvm_arm_get_reg(vcpu, &reg);
- }
- case KVM_GET_REG_LIST: {
- struct kvm_reg_list __user *user_list = argp;
- struct kvm_reg_list reg_list;
- unsigned n;
-
- if (unlikely(!kvm_vcpu_initialized(vcpu)))
- return -ENOEXEC;
-
- if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
- return -EFAULT;
- n = reg_list.n;
- reg_list.n = kvm_arm_num_regs(vcpu);
- if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
- return -EFAULT;
- if (n < reg_list.n)
- return -E2BIG;
- return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
- }
- case KVM_SET_DEVICE_ATTR: {
- if (copy_from_user(&attr, argp, sizeof(attr)))
- return -EFAULT;
- return kvm_arm_vcpu_set_attr(vcpu, &attr);
- }
- case KVM_GET_DEVICE_ATTR: {
- if (copy_from_user(&attr, argp, sizeof(attr)))
- return -EFAULT;
- return kvm_arm_vcpu_get_attr(vcpu, &attr);
- }
- case KVM_HAS_DEVICE_ATTR: {
- if (copy_from_user(&attr, argp, sizeof(attr)))
- return -EFAULT;
- return kvm_arm_vcpu_has_attr(vcpu, &attr);
- }
- default:
- return -EINVAL;
- }
-}
-
-/**
- * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
- * @kvm: kvm instance
- * @log: slot id and address to which we copy the log
- *
- * Steps 1-4 below provide general overview of dirty page logging. See
- * kvm_get_dirty_log_protect() function description for additional details.
- *
- * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
- * always flush the TLB (step 4) even if previous step failed and the dirty
- * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
- * does not preclude user space subsequent dirty log read. Flushing TLB ensures
- * writes will be marked dirty for next log read.
- *
- * 1. Take a snapshot of the bit and clear it if needed.
- * 2. Write protect the corresponding page.
- * 3. Copy the snapshot to the userspace.
- * 4. Flush TLB's if needed.
- */
-int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
-{
- bool is_dirty = false;
- int r;
-
- mutex_lock(&kvm->slots_lock);
-
- r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
-
- if (is_dirty)
- kvm_flush_remote_tlbs(kvm);
-
- mutex_unlock(&kvm->slots_lock);
- return r;
-}
-
-static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
- struct kvm_arm_device_addr *dev_addr)
-{
- unsigned long dev_id, type;
-
- dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
- KVM_ARM_DEVICE_ID_SHIFT;
- type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
- KVM_ARM_DEVICE_TYPE_SHIFT;
-
- switch (dev_id) {
- case KVM_ARM_DEVICE_VGIC_V2:
- if (!vgic_present)
- return -ENXIO;
- return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
- default:
- return -ENODEV;
- }
-}
-
-long kvm_arch_vm_ioctl(struct file *filp,
- unsigned int ioctl, unsigned long arg)
-{
- struct kvm *kvm = filp->private_data;
- void __user *argp = (void __user *)arg;
-
- switch (ioctl) {
- case KVM_CREATE_IRQCHIP: {
- int ret;
- if (!vgic_present)
- return -ENXIO;
- mutex_lock(&kvm->lock);
- ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
- mutex_unlock(&kvm->lock);
- return ret;
- }
- case KVM_ARM_SET_DEVICE_ADDR: {
- struct kvm_arm_device_addr dev_addr;
-
- if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
- return -EFAULT;
- return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
- }
- case KVM_ARM_PREFERRED_TARGET: {
- int err;
- struct kvm_vcpu_init init;
-
- err = kvm_vcpu_preferred_target(&init);
- if (err)
- return err;
-
- if (copy_to_user(argp, &init, sizeof(init)))
- return -EFAULT;
-
- return 0;
- }
- default:
- return -EINVAL;
- }
-}
-
-static void cpu_init_hyp_mode(void *dummy)
-{
- phys_addr_t pgd_ptr;
- unsigned long hyp_stack_ptr;
- unsigned long stack_page;
- unsigned long vector_ptr;
-
- /* Switch from the HYP stub to our own HYP init vector */
- __hyp_set_vectors(kvm_get_idmap_vector());
-
- pgd_ptr = kvm_mmu_get_httbr();
- stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
- hyp_stack_ptr = stack_page + PAGE_SIZE;
- vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
-
- __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
- __cpu_init_stage2();
-
- if (is_kernel_in_hyp_mode())
- kvm_timer_init_vhe();
-
- kvm_arm_init_debug();
-}
-
-static void cpu_hyp_reset(void)
-{
- if (!is_kernel_in_hyp_mode())
- __hyp_reset_vectors();
-}
-
-static void cpu_hyp_reinit(void)
-{
- cpu_hyp_reset();
-
- if (is_kernel_in_hyp_mode()) {
- /*
- * __cpu_init_stage2() is safe to call even if the PM
- * event was cancelled before the CPU was reset.
- */
- __cpu_init_stage2();
- } else {
- cpu_init_hyp_mode(NULL);
- }
-
- if (vgic_present)
- kvm_vgic_init_cpu_hardware();
-}
-
-static void _kvm_arch_hardware_enable(void *discard)
-{
- if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
- cpu_hyp_reinit();
- __this_cpu_write(kvm_arm_hardware_enabled, 1);
- }
-}
-
-int kvm_arch_hardware_enable(void)
-{
- _kvm_arch_hardware_enable(NULL);
- return 0;
-}
-
-static void _kvm_arch_hardware_disable(void *discard)
-{
- if (__this_cpu_read(kvm_arm_hardware_enabled)) {
- cpu_hyp_reset();
- __this_cpu_write(kvm_arm_hardware_enabled, 0);
- }
-}
-
-void kvm_arch_hardware_disable(void)
-{
- _kvm_arch_hardware_disable(NULL);
-}
-
-#ifdef CONFIG_CPU_PM
-static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
- unsigned long cmd,
- void *v)
-{
- /*
- * kvm_arm_hardware_enabled is left with its old value over
- * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
- * re-enable hyp.
- */
- switch (cmd) {
- case CPU_PM_ENTER:
- if (__this_cpu_read(kvm_arm_hardware_enabled))
- /*
- * don't update kvm_arm_hardware_enabled here
- * so that the hardware will be re-enabled
- * when we resume. See below.
- */
- cpu_hyp_reset();
-
- return NOTIFY_OK;
- case CPU_PM_EXIT:
- if (__this_cpu_read(kvm_arm_hardware_enabled))
- /* The hardware was enabled before suspend. */
- cpu_hyp_reinit();
-
- return NOTIFY_OK;
-
- default:
- return NOTIFY_DONE;
- }
-}
-
-static struct notifier_block hyp_init_cpu_pm_nb = {
- .notifier_call = hyp_init_cpu_pm_notifier,
-};
-
-static void __init hyp_cpu_pm_init(void)
-{
- cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
-}
-static void __init hyp_cpu_pm_exit(void)
-{
- cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
-}
-#else
-static inline void hyp_cpu_pm_init(void)
-{
-}
-static inline void hyp_cpu_pm_exit(void)
-{
-}
-#endif
-
-static void teardown_common_resources(void)
-{
- free_percpu(kvm_host_cpu_state);
-}
-
-static int init_common_resources(void)
-{
- kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
- if (!kvm_host_cpu_state) {
- kvm_err("Cannot allocate host CPU state\n");
- return -ENOMEM;
- }
-
- /* set size of VMID supported by CPU */
- kvm_vmid_bits = kvm_get_vmid_bits();
- kvm_info("%d-bit VMID\n", kvm_vmid_bits);
-
- return 0;
-}
-
-static int init_subsystems(void)
-{
- int err = 0;
-
- /*
- * Enable hardware so that subsystem initialisation can access EL2.
- */
- on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
-
- /*
- * Register CPU lower-power notifier
- */
- hyp_cpu_pm_init();
-
- /*
- * Init HYP view of VGIC
- */
- err = kvm_vgic_hyp_init();
- switch (err) {
- case 0:
- vgic_present = true;
- break;
- case -ENODEV:
- case -ENXIO:
- vgic_present = false;
- err = 0;
- break;
- default:
- goto out;
- }
-
- /*
- * Init HYP architected timer support
- */
- err = kvm_timer_hyp_init();
- if (err)
- goto out;
-
- kvm_perf_init();
- kvm_coproc_table_init();
-
-out:
- on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
-
- return err;
-}
-
-static void teardown_hyp_mode(void)
-{
- int cpu;
-
- if (is_kernel_in_hyp_mode())
- return;
-
- free_hyp_pgds();
- for_each_possible_cpu(cpu)
- free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
- hyp_cpu_pm_exit();
-}
-
-static int init_vhe_mode(void)
-{
- kvm_info("VHE mode initialized successfully\n");
- return 0;
-}
-
-/**
- * Inits Hyp-mode on all online CPUs
- */
-static int init_hyp_mode(void)
-{
- int cpu;
- int err = 0;
-
- /*
- * Allocate Hyp PGD and setup Hyp identity mapping
- */
- err = kvm_mmu_init();
- if (err)
- goto out_err;
-
- /*
- * Allocate stack pages for Hypervisor-mode
- */
- for_each_possible_cpu(cpu) {
- unsigned long stack_page;
-
- stack_page = __get_free_page(GFP_KERNEL);
- if (!stack_page) {
- err = -ENOMEM;
- goto out_err;
- }
-
- per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
- }
-
- /*
- * Map the Hyp-code called directly from the host
- */
- err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
- kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
- if (err) {
- kvm_err("Cannot map world-switch code\n");
- goto out_err;
- }
-
- err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
- kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
- if (err) {
- kvm_err("Cannot map rodata section\n");
- goto out_err;
- }
-
- err = create_hyp_mappings(kvm_ksym_ref(__bss_start),
- kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
- if (err) {
- kvm_err("Cannot map bss section\n");
- goto out_err;
- }
-
- /*
- * Map the Hyp stack pages
- */
- for_each_possible_cpu(cpu) {
- char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
- err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
- PAGE_HYP);
-
- if (err) {
- kvm_err("Cannot map hyp stack\n");
- goto out_err;
- }
- }
-
- for_each_possible_cpu(cpu) {
- kvm_cpu_context_t *cpu_ctxt;
-
- cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
- err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
-
- if (err) {
- kvm_err("Cannot map host CPU state: %d\n", err);
- goto out_err;
- }
- }
-
- kvm_info("Hyp mode initialized successfully\n");
-
- return 0;
-
-out_err:
- teardown_hyp_mode();
- kvm_err("error initializing Hyp mode: %d\n", err);
- return err;
-}
-
-static void check_kvm_target_cpu(void *ret)
-{
- *(int *)ret = kvm_target_cpu();
-}
-
-struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
-{
- struct kvm_vcpu *vcpu;
- int i;
-
- mpidr &= MPIDR_HWID_BITMASK;
- kvm_for_each_vcpu(i, vcpu, kvm) {
- if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
- return vcpu;
- }
- return NULL;
-}
-
-/**
- * Initialize Hyp-mode and memory mappings on all CPUs.
- */
-int kvm_arch_init(void *opaque)
-{
- int err;
- int ret, cpu;
-
- if (!is_hyp_mode_available()) {
- kvm_err("HYP mode not available\n");
- return -ENODEV;
- }
-
- for_each_online_cpu(cpu) {
- smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
- if (ret < 0) {
- kvm_err("Error, CPU %d not supported!\n", cpu);
- return -ENODEV;
- }
- }
-
- err = init_common_resources();
- if (err)
- return err;
-
- if (is_kernel_in_hyp_mode())
- err = init_vhe_mode();
- else
- err = init_hyp_mode();
- if (err)
- goto out_err;
-
- err = init_subsystems();
- if (err)
- goto out_hyp;
-
- return 0;
-
-out_hyp:
- teardown_hyp_mode();
-out_err:
- teardown_common_resources();
- return err;
-}
-
-/* NOP: Compiling as a module not supported */
-void kvm_arch_exit(void)
-{
- kvm_perf_teardown();
-}
-
-static int arm_init(void)
-{
- int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
- return rc;
-}
-
-module_init(arm_init);