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-rw-r--r--kernel/arch/arm/kvm/arm.c1154
1 files changed, 1154 insertions, 0 deletions
diff --git a/kernel/arch/arm/kvm/arm.c b/kernel/arch/arm/kvm/arm.c
new file mode 100644
index 000000000..adb19885a
--- /dev/null
+++ b/kernel/arch/arm/kvm/arm.c
@@ -0,0 +1,1154 @@
+/*
+ * 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.h>
+#include <linux/cpu_pm.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kvm_host.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>
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
+#include <asm/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>
+
+#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;
+static unsigned long hyp_default_vectors;
+
+/* 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 u8 kvm_next_vmid;
+static DEFINE_SPINLOCK(kvm_vmid_lock);
+
+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_hardware_enable(void)
+{
+ return 0;
+}
+
+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 = 0;
+
+ if (type)
+ return -EINVAL;
+
+ ret = kvm_alloc_stage2_pgd(kvm);
+ if (ret)
+ goto out_fail_alloc;
+
+ ret = create_hyp_mappings(kvm, kvm + 1);
+ if (ret)
+ goto out_free_stage2_pgd;
+
+ kvm_timer_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 = kvm_vgic_get_max_vcpus();
+
+ return ret;
+out_free_stage2_pgd:
+ kvm_free_stage2_pgd(kvm);
+out_fail_alloc:
+ return ret;
+}
+
+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;
+
+ kvm_free_stage2_pgd(kvm);
+
+ 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:
+ case KVM_CAP_IRQFD:
+ 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:
+ r = 1;
+ break;
+ case KVM_CAP_COALESCED_MMIO:
+ r = KVM_COALESCED_MMIO_PAGE_OFFSET;
+ 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;
+ default:
+ r = kvm_arch_dev_ioctl_check_extension(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);
+ 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)
+{
+}
+
+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);
+ 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);
+}
+
+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);
+
+ return 0;
+}
+
+void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+ vcpu->cpu = cpu;
+ vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
+
+ kvm_arm_set_running_vcpu(vcpu);
+}
+
+void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+{
+ /*
+ * The arch-generic KVM code expects the cpu field of a vcpu to be -1
+ * if the vcpu is no longer assigned to a cpu. This is used for the
+ * optimized make_all_cpus_request path.
+ */
+ vcpu->cpu = -1;
+
+ kvm_arm_set_running_vcpu(NULL);
+}
+
+int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
+ struct kvm_guest_debug *dbg)
+{
+ return -EINVAL;
+}
+
+
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+{
+ if (vcpu->arch.pause)
+ 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.pause = false;
+ break;
+ case KVM_MP_STATE_STOPPED:
+ vcpu->arch.pause = 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);
+}
+
+/* Just ensure a guest exit from a particular CPU */
+static void exit_vm_noop(void *info)
+{
+}
+
+void force_vm_exit(const cpumask_t *mask)
+{
+ smp_call_function_many(mask, exit_vm_noop, NULL, true);
+}
+
+/**
+ * need_new_vmid_gen - check that the VMID is still valid
+ * @kvm: The VM's VMID to checkt
+ *
+ * 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++;
+
+ /* update vttbr to be used with the new vmid */
+ pgd_phys = virt_to_phys(kvm_get_hwpgd(kvm));
+ BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
+ vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK;
+ 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;
+
+ 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(!vgic_ready(kvm))) {
+ ret = kvm_vgic_map_resources(kvm);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * Enable the arch timers only if we have an in-kernel VGIC
+ * and it has been properly initialized, since we cannot handle
+ * interrupts from the virtual timer with a userspace gic.
+ */
+ if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
+ kvm_timer_enable(kvm);
+
+ return 0;
+}
+
+bool kvm_arch_intc_initialized(struct kvm *kvm)
+{
+ return vgic_initialized(kvm);
+}
+
+static void vcpu_pause(struct kvm_vcpu *vcpu)
+{
+ struct swait_head *wq = kvm_arch_vcpu_wq(vcpu);
+
+ swait_event_interruptible(*wq, !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 (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.pause)
+ vcpu_pause(vcpu);
+
+ kvm_vgic_flush_hwstate(vcpu);
+ kvm_timer_flush_hwstate(vcpu);
+
+ local_irq_disable();
+
+ /*
+ * Re-check atomic conditions
+ */
+ if (signal_pending(current)) {
+ ret = -EINTR;
+ run->exit_reason = KVM_EXIT_INTR;
+ }
+
+ if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
+ local_irq_enable();
+ kvm_timer_sync_hwstate(vcpu);
+ kvm_vgic_sync_hwstate(vcpu);
+ continue;
+ }
+
+ /**************************************************************
+ * Enter the guest
+ */
+ trace_kvm_entry(*vcpu_pc(vcpu));
+ kvm_guest_enter();
+ vcpu->mode = IN_GUEST_MODE;
+
+ ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
+
+ vcpu->mode = OUTSIDE_GUEST_MODE;
+ kvm_guest_exit();
+ trace_kvm_exit(kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(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();
+
+ /*
+ * Back from guest
+ *************************************************************/
+
+ kvm_timer_sync_hwstate(vcpu);
+ kvm_vgic_sync_hwstate(vcpu);
+
+ ret = handle_exit(vcpu, run, ret);
+ }
+
+ 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 by marking the VCPU as paused.
+ */
+ if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
+ vcpu->arch.pause = true;
+ else
+ vcpu->arch.pause = false;
+
+ return 0;
+}
+
+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;
+
+ 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);
+ }
+ 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:
+ 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: {
+ return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
+ }
+ 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 boot_pgd_ptr;
+ 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());
+
+ boot_pgd_ptr = kvm_mmu_get_boot_httbr();
+ 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_hyp_vector;
+
+ __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
+}
+
+static int hyp_init_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *cpu)
+{
+ switch (action) {
+ case CPU_STARTING:
+ case CPU_STARTING_FROZEN:
+ if (__hyp_get_vectors() == hyp_default_vectors)
+ cpu_init_hyp_mode(NULL);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block hyp_init_cpu_nb = {
+ .notifier_call = hyp_init_cpu_notify,
+};
+
+#ifdef CONFIG_CPU_PM
+static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
+ unsigned long cmd,
+ void *v)
+{
+ if (cmd == CPU_PM_EXIT &&
+ __hyp_get_vectors() == hyp_default_vectors) {
+ cpu_init_hyp_mode(NULL);
+ return NOTIFY_OK;
+ }
+
+ 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);
+}
+#else
+static inline void hyp_cpu_pm_init(void)
+{
+}
+#endif
+
+/**
+ * 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;
+
+ /*
+ * It is probably enough to obtain the default on one
+ * CPU. It's unlikely to be different on the others.
+ */
+ hyp_default_vectors = __hyp_get_vectors();
+
+ /*
+ * 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_free_stack_pages;
+ }
+
+ per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
+ }
+
+ /*
+ * Map the Hyp-code called directly from the host
+ */
+ err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end);
+ if (err) {
+ kvm_err("Cannot map world-switch code\n");
+ goto out_free_mappings;
+ }
+
+ /*
+ * 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);
+
+ if (err) {
+ kvm_err("Cannot map hyp stack\n");
+ goto out_free_mappings;
+ }
+ }
+
+ /*
+ * Map the host CPU structures
+ */
+ kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
+ if (!kvm_host_cpu_state) {
+ err = -ENOMEM;
+ kvm_err("Cannot allocate host CPU state\n");
+ goto out_free_mappings;
+ }
+
+ 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);
+
+ if (err) {
+ kvm_err("Cannot map host CPU state: %d\n", err);
+ goto out_free_context;
+ }
+ }
+
+ /*
+ * Execute the init code on each CPU.
+ */
+ on_each_cpu(cpu_init_hyp_mode, NULL, 1);
+
+ /*
+ * Init HYP view of VGIC
+ */
+ err = kvm_vgic_hyp_init();
+ if (err)
+ goto out_free_context;
+
+ /*
+ * Init HYP architected timer support
+ */
+ err = kvm_timer_hyp_init();
+ if (err)
+ goto out_free_mappings;
+
+#ifndef CONFIG_HOTPLUG_CPU
+ free_boot_hyp_pgd();
+#endif
+
+ kvm_perf_init();
+
+ kvm_info("Hyp mode initialized successfully\n");
+
+ return 0;
+out_free_context:
+ free_percpu(kvm_host_cpu_state);
+out_free_mappings:
+ free_hyp_pgds();
+out_free_stack_pages:
+ for_each_possible_cpu(cpu)
+ free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
+out_err:
+ 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;
+ }
+ }
+
+ cpu_notifier_register_begin();
+
+ err = init_hyp_mode();
+ if (err)
+ goto out_err;
+
+ err = __register_cpu_notifier(&hyp_init_cpu_nb);
+ if (err) {
+ kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
+ goto out_err;
+ }
+
+ cpu_notifier_register_done();
+
+ hyp_cpu_pm_init();
+
+ kvm_coproc_table_init();
+ return 0;
+out_err:
+ cpu_notifier_register_done();
+ 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);