KVM: arm64: Move virt/kvm/arm to arch/arm64

Now that the 32bit KVM/arm host is a distant memory, let's move the
whole of the KVM/arm64 code into the arm64 tree.

As they said in the song: Welcome Home (Sanitarium).

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20200513104034.74741-1-maz@kernel.org

1 files changed, 0 insertions, 556 deletions

diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
deleted file mode 100644
index 32e32d67a127..000000000000
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ /dev/null
@@ -1,556 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2015, 2016 ARM Ltd.
- */
-
-#include <linux/uaccess.h>
-#include <linux/interrupt.h>
-#include <linux/cpu.h>
-#include <linux/kvm_host.h>
-#include <kvm/arm_vgic.h>
-#include <asm/kvm_emulate.h>
-#include <asm/kvm_mmu.h>
-#include "vgic.h"
-
-/*
- * Initialization rules: there are multiple stages to the vgic
- * initialization, both for the distributor and the CPU interfaces.  The basic
- * idea is that even though the VGIC is not functional or not requested from
- * user space, the critical path of the run loop can still call VGIC functions
- * that just won't do anything, without them having to check additional
- * initialization flags to ensure they don't look at uninitialized data
- * structures.
- *
- * Distributor:
- *
- * - kvm_vgic_early_init(): initialization of static data that doesn't
- *   depend on any sizing information or emulation type. No allocation
- *   is allowed there.
- *
- * - vgic_init(): allocation and initialization of the generic data
- *   structures that depend on sizing information (number of CPUs,
- *   number of interrupts). Also initializes the vcpu specific data
- *   structures. Can be executed lazily for GICv2.
- *
- * CPU Interface:
- *
- * - kvm_vgic_vcpu_init(): initialization of static data that
- *   doesn't depend on any sizing information or emulation type. No
- *   allocation is allowed there.
- */
-
-/* EARLY INIT */
-
-/**
- * kvm_vgic_early_init() - Initialize static VGIC VCPU data structures
- * @kvm: The VM whose VGIC districutor should be initialized
- *
- * Only do initialization of static structures that don't require any
- * allocation or sizing information from userspace.  vgic_init() called
- * kvm_vgic_dist_init() which takes care of the rest.
- */
-void kvm_vgic_early_init(struct kvm *kvm)
-{
-	struct vgic_dist *dist = &kvm->arch.vgic;
-
-	INIT_LIST_HEAD(&dist->lpi_list_head);
-	INIT_LIST_HEAD(&dist->lpi_translation_cache);
-	raw_spin_lock_init(&dist->lpi_list_lock);
-}
-
-/* CREATION */
-
-/**
- * kvm_vgic_create: triggered by the instantiation of the VGIC device by
- * user space, either through the legacy KVM_CREATE_IRQCHIP ioctl (v2 only)
- * or through the generic KVM_CREATE_DEVICE API ioctl.
- * irqchip_in_kernel() tells you if this function succeeded or not.
- * @kvm: kvm struct pointer
- * @type: KVM_DEV_TYPE_ARM_VGIC_V[23]
- */
-int kvm_vgic_create(struct kvm *kvm, u32 type)
-{
-	int i, ret;
-	struct kvm_vcpu *vcpu;
-
-	if (irqchip_in_kernel(kvm))
-		return -EEXIST;
-
-	/*
-	 * This function is also called by the KVM_CREATE_IRQCHIP handler,
-	 * which had no chance yet to check the availability of the GICv2
-	 * emulation. So check this here again. KVM_CREATE_DEVICE does
-	 * the proper checks already.
-	 */
-	if (type == KVM_DEV_TYPE_ARM_VGIC_V2 &&
-		!kvm_vgic_global_state.can_emulate_gicv2)
-		return -ENODEV;
-
-	ret = -EBUSY;
-	if (!lock_all_vcpus(kvm))
-		return ret;
-
-	kvm_for_each_vcpu(i, vcpu, kvm) {
-		if (vcpu->arch.has_run_once)
-			goto out_unlock;
-	}
-	ret = 0;
-
-	if (type == KVM_DEV_TYPE_ARM_VGIC_V2)
-		kvm->arch.max_vcpus = VGIC_V2_MAX_CPUS;
-	else
-		kvm->arch.max_vcpus = VGIC_V3_MAX_CPUS;
-
-	if (atomic_read(&kvm->online_vcpus) > kvm->arch.max_vcpus) {
-		ret = -E2BIG;
-		goto out_unlock;
-	}
-
-	kvm->arch.vgic.in_kernel = true;
-	kvm->arch.vgic.vgic_model = type;
-
-	kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
-
-	if (type == KVM_DEV_TYPE_ARM_VGIC_V2)
-		kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
-	else
-		INIT_LIST_HEAD(&kvm->arch.vgic.rd_regions);
-
-out_unlock:
-	unlock_all_vcpus(kvm);
-	return ret;
-}
-
-/* INIT/DESTROY */
-
-/**
- * kvm_vgic_dist_init: initialize the dist data structures
- * @kvm: kvm struct pointer
- * @nr_spis: number of spis, frozen by caller
- */
-static int kvm_vgic_dist_init(struct kvm *kvm, unsigned int nr_spis)
-{
-	struct vgic_dist *dist = &kvm->arch.vgic;
-	struct kvm_vcpu *vcpu0 = kvm_get_vcpu(kvm, 0);
-	int i;
-
-	dist->spis = kcalloc(nr_spis, sizeof(struct vgic_irq), GFP_KERNEL);
-	if (!dist->spis)
-		return  -ENOMEM;
-
-	/*
-	 * In the following code we do not take the irq struct lock since
-	 * no other action on irq structs can happen while the VGIC is
-	 * not initialized yet:
-	 * If someone wants to inject an interrupt or does a MMIO access, we
-	 * require prior initialization in case of a virtual GICv3 or trigger
-	 * initialization when using a virtual GICv2.
-	 */
-	for (i = 0; i < nr_spis; i++) {
-		struct vgic_irq *irq = &dist->spis[i];
-
-		irq->intid = i + VGIC_NR_PRIVATE_IRQS;
-		INIT_LIST_HEAD(&irq->ap_list);
-		raw_spin_lock_init(&irq->irq_lock);
-		irq->vcpu = NULL;
-		irq->target_vcpu = vcpu0;
-		kref_init(&irq->refcount);
-		switch (dist->vgic_model) {
-		case KVM_DEV_TYPE_ARM_VGIC_V2:
-			irq->targets = 0;
-			irq->group = 0;
-			break;
-		case KVM_DEV_TYPE_ARM_VGIC_V3:
-			irq->mpidr = 0;
-			irq->group = 1;
-			break;
-		default:
-			kfree(dist->spis);
-			dist->spis = NULL;
-			return -EINVAL;
-		}
-	}
-	return 0;
-}
-
-/**
- * kvm_vgic_vcpu_init() - Initialize static VGIC VCPU data
- * structures and register VCPU-specific KVM iodevs
- *
- * @vcpu: pointer to the VCPU being created and initialized
- *
- * Only do initialization, but do not actually enable the
- * VGIC CPU interface
- */
-int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
-{
-	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
-	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
-	int ret = 0;
-	int i;
-
-	vgic_cpu->rd_iodev.base_addr = VGIC_ADDR_UNDEF;
-
-	INIT_LIST_HEAD(&vgic_cpu->ap_list_head);
-	raw_spin_lock_init(&vgic_cpu->ap_list_lock);
-	atomic_set(&vgic_cpu->vgic_v3.its_vpe.vlpi_count, 0);
-
-	/*
-	 * Enable and configure all SGIs to be edge-triggered and
-	 * configure all PPIs as level-triggered.
-	 */
-	for (i = 0; i < VGIC_NR_PRIVATE_IRQS; i++) {
-		struct vgic_irq *irq = &vgic_cpu->private_irqs[i];
-
-		INIT_LIST_HEAD(&irq->ap_list);
-		raw_spin_lock_init(&irq->irq_lock);
-		irq->intid = i;
-		irq->vcpu = NULL;
-		irq->target_vcpu = vcpu;
-		kref_init(&irq->refcount);
-		if (vgic_irq_is_sgi(i)) {
-			/* SGIs */
-			irq->enabled = 1;
-			irq->config = VGIC_CONFIG_EDGE;
-		} else {
-			/* PPIs */
-			irq->config = VGIC_CONFIG_LEVEL;
-		}
-	}
-
-	if (!irqchip_in_kernel(vcpu->kvm))
-		return 0;
-
-	/*
-	 * If we are creating a VCPU with a GICv3 we must also register the
-	 * KVM io device for the redistributor that belongs to this VCPU.
-	 */
-	if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
-		mutex_lock(&vcpu->kvm->lock);
-		ret = vgic_register_redist_iodev(vcpu);
-		mutex_unlock(&vcpu->kvm->lock);
-	}
-	return ret;
-}
-
-static void kvm_vgic_vcpu_enable(struct kvm_vcpu *vcpu)
-{
-	if (kvm_vgic_global_state.type == VGIC_V2)
-		vgic_v2_enable(vcpu);
-	else
-		vgic_v3_enable(vcpu);
-}
-
-/*
- * vgic_init: allocates and initializes dist and vcpu data structures
- * depending on two dimensioning parameters:
- * - the number of spis
- * - the number of vcpus
- * The function is generally called when nr_spis has been explicitly set
- * by the guest through the KVM DEVICE API. If not nr_spis is set to 256.
- * vgic_initialized() returns true when this function has succeeded.
- * Must be called with kvm->lock held!
- */
-int vgic_init(struct kvm *kvm)
-{
-	struct vgic_dist *dist = &kvm->arch.vgic;
-	struct kvm_vcpu *vcpu;
-	int ret = 0, i, idx;
-
-	if (vgic_initialized(kvm))
-		return 0;
-
-	/* Are we also in the middle of creating a VCPU? */
-	if (kvm->created_vcpus != atomic_read(&kvm->online_vcpus))
-		return -EBUSY;
-
-	/* freeze the number of spis */
-	if (!dist->nr_spis)
-		dist->nr_spis = VGIC_NR_IRQS_LEGACY - VGIC_NR_PRIVATE_IRQS;
-
-	ret = kvm_vgic_dist_init(kvm, dist->nr_spis);
-	if (ret)
-		goto out;
-
-	/* Initialize groups on CPUs created before the VGIC type was known */
-	kvm_for_each_vcpu(idx, vcpu, kvm) {
-		struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
-
-		for (i = 0; i < VGIC_NR_PRIVATE_IRQS; i++) {
-			struct vgic_irq *irq = &vgic_cpu->private_irqs[i];
-			switch (dist->vgic_model) {
-			case KVM_DEV_TYPE_ARM_VGIC_V3:
-				irq->group = 1;
-				irq->mpidr = kvm_vcpu_get_mpidr_aff(vcpu);
-				break;
-			case KVM_DEV_TYPE_ARM_VGIC_V2:
-				irq->group = 0;
-				irq->targets = 1U << idx;
-				break;
-			default:
-				ret = -EINVAL;
-				goto out;
-			}
-		}
-	}
-
-	if (vgic_has_its(kvm))
-		vgic_lpi_translation_cache_init(kvm);
-
-	/*
-	 * If we have GICv4.1 enabled, unconditionnaly request enable the
-	 * v4 support so that we get HW-accelerated vSGIs. Otherwise, only
-	 * enable it if we present a virtual ITS to the guest.
-	 */
-	if (vgic_supports_direct_msis(kvm)) {
-		ret = vgic_v4_init(kvm);
-		if (ret)
-			goto out;
-	}
-
-	kvm_for_each_vcpu(i, vcpu, kvm)
-		kvm_vgic_vcpu_enable(vcpu);
-
-	ret = kvm_vgic_setup_default_irq_routing(kvm);
-	if (ret)
-		goto out;
-
-	vgic_debug_init(kvm);
-
-	dist->implementation_rev = 2;
-	dist->initialized = true;
-
-out:
-	return ret;
-}
-
-static void kvm_vgic_dist_destroy(struct kvm *kvm)
-{
-	struct vgic_dist *dist = &kvm->arch.vgic;
-	struct vgic_redist_region *rdreg, *next;
-
-	dist->ready = false;
-	dist->initialized = false;
-
-	kfree(dist->spis);
-	dist->spis = NULL;
-	dist->nr_spis = 0;
-
-	if (kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
-		list_for_each_entry_safe(rdreg, next, &dist->rd_regions, list) {
-			list_del(&rdreg->list);
-			kfree(rdreg);
-		}
-		INIT_LIST_HEAD(&dist->rd_regions);
-	}
-
-	if (vgic_has_its(kvm))
-		vgic_lpi_translation_cache_destroy(kvm);
-
-	if (vgic_supports_direct_msis(kvm))
-		vgic_v4_teardown(kvm);
-}
-
-void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu)
-{
-	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
-
-	/*
-	 * Retire all pending LPIs on this vcpu anyway as we're
-	 * going to destroy it.
-	 */
-	vgic_flush_pending_lpis(vcpu);
-
-	INIT_LIST_HEAD(&vgic_cpu->ap_list_head);
-}
-
-/* To be called with kvm->lock held */
-static void __kvm_vgic_destroy(struct kvm *kvm)
-{
-	struct kvm_vcpu *vcpu;
-	int i;
-
-	vgic_debug_destroy(kvm);
-
-	kvm_for_each_vcpu(i, vcpu, kvm)
-		kvm_vgic_vcpu_destroy(vcpu);
-
-	kvm_vgic_dist_destroy(kvm);
-}
-
-void kvm_vgic_destroy(struct kvm *kvm)
-{
-	mutex_lock(&kvm->lock);
-	__kvm_vgic_destroy(kvm);
-	mutex_unlock(&kvm->lock);
-}
-
-/**
- * vgic_lazy_init: Lazy init is only allowed if the GIC exposed to the guest
- * is a GICv2. A GICv3 must be explicitly initialized by the guest using the
- * KVM_DEV_ARM_VGIC_GRP_CTRL KVM_DEVICE group.
- * @kvm: kvm struct pointer
- */
-int vgic_lazy_init(struct kvm *kvm)
-{
-	int ret = 0;
-
-	if (unlikely(!vgic_initialized(kvm))) {
-		/*
-		 * We only provide the automatic initialization of the VGIC
-		 * for the legacy case of a GICv2. Any other type must
-		 * be explicitly initialized once setup with the respective
-		 * KVM device call.
-		 */
-		if (kvm->arch.vgic.vgic_model != KVM_DEV_TYPE_ARM_VGIC_V2)
-			return -EBUSY;
-
-		mutex_lock(&kvm->lock);
-		ret = vgic_init(kvm);
-		mutex_unlock(&kvm->lock);
-	}
-
-	return ret;
-}
-
-/* RESOURCE MAPPING */
-
-/**
- * Map the MMIO regions depending on the VGIC model exposed to the guest
- * called on the first VCPU run.
- * Also map the virtual CPU interface into the VM.
- * v2/v3 derivatives call vgic_init if not already done.
- * vgic_ready() returns true if this function has succeeded.
- * @kvm: kvm struct pointer
- */
-int kvm_vgic_map_resources(struct kvm *kvm)
-{
-	struct vgic_dist *dist = &kvm->arch.vgic;
-	int ret = 0;
-
-	mutex_lock(&kvm->lock);
-	if (!irqchip_in_kernel(kvm))
-		goto out;
-
-	if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2)
-		ret = vgic_v2_map_resources(kvm);
-	else
-		ret = vgic_v3_map_resources(kvm);
-
-	if (ret)
-		__kvm_vgic_destroy(kvm);
-
-out:
-	mutex_unlock(&kvm->lock);
-	return ret;
-}
-
-/* GENERIC PROBE */
-
-static int vgic_init_cpu_starting(unsigned int cpu)
-{
-	enable_percpu_irq(kvm_vgic_global_state.maint_irq, 0);
-	return 0;
-}
-
-
-static int vgic_init_cpu_dying(unsigned int cpu)
-{
-	disable_percpu_irq(kvm_vgic_global_state.maint_irq);
-	return 0;
-}
-
-static irqreturn_t vgic_maintenance_handler(int irq, void *data)
-{
-	/*
-	 * We cannot rely on the vgic maintenance interrupt to be
-	 * delivered synchronously. This means we can only use it to
-	 * exit the VM, and we perform the handling of EOIed
-	 * interrupts on the exit path (see vgic_fold_lr_state).
-	 */
-	return IRQ_HANDLED;
-}
-
-/**
- * kvm_vgic_init_cpu_hardware - initialize the GIC VE hardware
- *
- * For a specific CPU, initialize the GIC VE hardware.
- */
-void kvm_vgic_init_cpu_hardware(void)
-{
-	BUG_ON(preemptible());
-
-	/*
-	 * We want to make sure the list registers start out clear so that we
-	 * only have the program the used registers.
-	 */
-	if (kvm_vgic_global_state.type == VGIC_V2)
-		vgic_v2_init_lrs();
-	else
-		kvm_call_hyp(__vgic_v3_init_lrs);
-}
-
-/**
- * kvm_vgic_hyp_init: populates the kvm_vgic_global_state variable
- * according to the host GIC model. Accordingly calls either
- * vgic_v2/v3_probe which registers the KVM_DEVICE that can be
- * instantiated by a guest later on .
- */
-int kvm_vgic_hyp_init(void)
-{
-	const struct gic_kvm_info *gic_kvm_info;
-	int ret;
-
-	gic_kvm_info = gic_get_kvm_info();
-	if (!gic_kvm_info)
-		return -ENODEV;
-
-	if (!gic_kvm_info->maint_irq) {
-		kvm_err("No vgic maintenance irq\n");
-		return -ENXIO;
-	}
-
-	switch (gic_kvm_info->type) {
-	case GIC_V2:
-		ret = vgic_v2_probe(gic_kvm_info);
-		break;
-	case GIC_V3:
-		ret = vgic_v3_probe(gic_kvm_info);
-		if (!ret) {
-			static_branch_enable(&kvm_vgic_global_state.gicv3_cpuif);
-			kvm_info("GIC system register CPU interface enabled\n");
-		}
-		break;
-	default:
-		ret = -ENODEV;
-	}
-
-	if (ret)
-		return ret;
-
-	kvm_vgic_global_state.maint_irq = gic_kvm_info->maint_irq;
-	ret = request_percpu_irq(kvm_vgic_global_state.maint_irq,
-				 vgic_maintenance_handler,
-				 "vgic", kvm_get_running_vcpus());
-	if (ret) {
-		kvm_err("Cannot register interrupt %d\n",
-			kvm_vgic_global_state.maint_irq);
-		return ret;
-	}
-
-	ret = cpuhp_setup_state(CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING,
-				"kvm/arm/vgic:starting",
-				vgic_init_cpu_starting, vgic_init_cpu_dying);
-	if (ret) {
-		kvm_err("Cannot register vgic CPU notifier\n");
-		goto out_free_irq;
-	}
-
-	kvm_info("vgic interrupt IRQ%d\n", kvm_vgic_global_state.maint_irq);
-	return 0;
-
-out_free_irq:
-	free_percpu_irq(kvm_vgic_global_state.maint_irq,
-			kvm_get_running_vcpus());
-	return ret;
-}