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-rw-r--r--virt/kvm/arm/vgic/vgic.c1011
1 files changed, 0 insertions, 1011 deletions
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
deleted file mode 100644
index 99b02ca730a8..000000000000
--- a/virt/kvm/arm/vgic/vgic.c
+++ /dev/null
@@ -1,1011 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2015, 2016 ARM Ltd.
- */
-
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/kvm.h>
-#include <linux/kvm_host.h>
-#include <linux/list_sort.h>
-#include <linux/nospec.h>
-
-#include <asm/kvm_hyp.h>
-
-#include "vgic.h"
-
-#define CREATE_TRACE_POINTS
-#include "trace.h"
-
-struct vgic_global kvm_vgic_global_state __ro_after_init = {
- .gicv3_cpuif = STATIC_KEY_FALSE_INIT,
-};
-
-/*
- * Locking order is always:
- * kvm->lock (mutex)
- * its->cmd_lock (mutex)
- * its->its_lock (mutex)
- * vgic_cpu->ap_list_lock must be taken with IRQs disabled
- * kvm->lpi_list_lock must be taken with IRQs disabled
- * vgic_irq->irq_lock must be taken with IRQs disabled
- *
- * As the ap_list_lock might be taken from the timer interrupt handler,
- * we have to disable IRQs before taking this lock and everything lower
- * than it.
- *
- * If you need to take multiple locks, always take the upper lock first,
- * then the lower ones, e.g. first take the its_lock, then the irq_lock.
- * If you are already holding a lock and need to take a higher one, you
- * have to drop the lower ranking lock first and re-aquire it after having
- * taken the upper one.
- *
- * When taking more than one ap_list_lock at the same time, always take the
- * lowest numbered VCPU's ap_list_lock first, so:
- * vcpuX->vcpu_id < vcpuY->vcpu_id:
- * raw_spin_lock(vcpuX->arch.vgic_cpu.ap_list_lock);
- * raw_spin_lock(vcpuY->arch.vgic_cpu.ap_list_lock);
- *
- * Since the VGIC must support injecting virtual interrupts from ISRs, we have
- * to use the raw_spin_lock_irqsave/raw_spin_unlock_irqrestore versions of outer
- * spinlocks for any lock that may be taken while injecting an interrupt.
- */
-
-/*
- * Iterate over the VM's list of mapped LPIs to find the one with a
- * matching interrupt ID and return a reference to the IRQ structure.
- */
-static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid)
-{
- struct vgic_dist *dist = &kvm->arch.vgic;
- struct vgic_irq *irq = NULL;
- unsigned long flags;
-
- raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
-
- list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
- if (irq->intid != intid)
- continue;
-
- /*
- * This increases the refcount, the caller is expected to
- * call vgic_put_irq() later once it's finished with the IRQ.
- */
- vgic_get_irq_kref(irq);
- goto out_unlock;
- }
- irq = NULL;
-
-out_unlock:
- raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
-
- return irq;
-}
-
-/*
- * This looks up the virtual interrupt ID to get the corresponding
- * struct vgic_irq. It also increases the refcount, so any caller is expected
- * to call vgic_put_irq() once it's finished with this IRQ.
- */
-struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
- u32 intid)
-{
- /* SGIs and PPIs */
- if (intid <= VGIC_MAX_PRIVATE) {
- intid = array_index_nospec(intid, VGIC_MAX_PRIVATE + 1);
- return &vcpu->arch.vgic_cpu.private_irqs[intid];
- }
-
- /* SPIs */
- if (intid < (kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) {
- intid = array_index_nospec(intid, kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS);
- return &kvm->arch.vgic.spis[intid - VGIC_NR_PRIVATE_IRQS];
- }
-
- /* LPIs */
- if (intid >= VGIC_MIN_LPI)
- return vgic_get_lpi(kvm, intid);
-
- WARN(1, "Looking up struct vgic_irq for reserved INTID");
- return NULL;
-}
-
-/*
- * We can't do anything in here, because we lack the kvm pointer to
- * lock and remove the item from the lpi_list. So we keep this function
- * empty and use the return value of kref_put() to trigger the freeing.
- */
-static void vgic_irq_release(struct kref *ref)
-{
-}
-
-/*
- * Drop the refcount on the LPI. Must be called with lpi_list_lock held.
- */
-void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq)
-{
- struct vgic_dist *dist = &kvm->arch.vgic;
-
- if (!kref_put(&irq->refcount, vgic_irq_release))
- return;
-
- list_del(&irq->lpi_list);
- dist->lpi_list_count--;
-
- kfree(irq);
-}
-
-void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq)
-{
- struct vgic_dist *dist = &kvm->arch.vgic;
- unsigned long flags;
-
- if (irq->intid < VGIC_MIN_LPI)
- return;
-
- raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
- __vgic_put_lpi_locked(kvm, irq);
- raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
-}
-
-void vgic_flush_pending_lpis(struct kvm_vcpu *vcpu)
-{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
- struct vgic_irq *irq, *tmp;
- unsigned long flags;
-
- raw_spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
-
- list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
- if (irq->intid >= VGIC_MIN_LPI) {
- raw_spin_lock(&irq->irq_lock);
- list_del(&irq->ap_list);
- irq->vcpu = NULL;
- raw_spin_unlock(&irq->irq_lock);
- vgic_put_irq(vcpu->kvm, irq);
- }
- }
-
- raw_spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
-}
-
-void vgic_irq_set_phys_pending(struct vgic_irq *irq, bool pending)
-{
- WARN_ON(irq_set_irqchip_state(irq->host_irq,
- IRQCHIP_STATE_PENDING,
- pending));
-}
-
-bool vgic_get_phys_line_level(struct vgic_irq *irq)
-{
- bool line_level;
-
- BUG_ON(!irq->hw);
-
- if (irq->get_input_level)
- return irq->get_input_level(irq->intid);
-
- WARN_ON(irq_get_irqchip_state(irq->host_irq,
- IRQCHIP_STATE_PENDING,
- &line_level));
- return line_level;
-}
-
-/* Set/Clear the physical active state */
-void vgic_irq_set_phys_active(struct vgic_irq *irq, bool active)
-{
-
- BUG_ON(!irq->hw);
- WARN_ON(irq_set_irqchip_state(irq->host_irq,
- IRQCHIP_STATE_ACTIVE,
- active));
-}
-
-/**
- * kvm_vgic_target_oracle - compute the target vcpu for an irq
- *
- * @irq: The irq to route. Must be already locked.
- *
- * Based on the current state of the interrupt (enabled, pending,
- * active, vcpu and target_vcpu), compute the next vcpu this should be
- * given to. Return NULL if this shouldn't be injected at all.
- *
- * Requires the IRQ lock to be held.
- */
-static struct kvm_vcpu *vgic_target_oracle(struct vgic_irq *irq)
-{
- lockdep_assert_held(&irq->irq_lock);
-
- /* If the interrupt is active, it must stay on the current vcpu */
- if (irq->active)
- return irq->vcpu ? : irq->target_vcpu;
-
- /*
- * If the IRQ is not active but enabled and pending, we should direct
- * it to its configured target VCPU.
- * If the distributor is disabled, pending interrupts shouldn't be
- * forwarded.
- */
- if (irq->enabled && irq_is_pending(irq)) {
- if (unlikely(irq->target_vcpu &&
- !irq->target_vcpu->kvm->arch.vgic.enabled))
- return NULL;
-
- return irq->target_vcpu;
- }
-
- /* If neither active nor pending and enabled, then this IRQ should not
- * be queued to any VCPU.
- */
- return NULL;
-}
-
-/*
- * The order of items in the ap_lists defines how we'll pack things in LRs as
- * well, the first items in the list being the first things populated in the
- * LRs.
- *
- * A hard rule is that active interrupts can never be pushed out of the LRs
- * (and therefore take priority) since we cannot reliably trap on deactivation
- * of IRQs and therefore they have to be present in the LRs.
- *
- * Otherwise things should be sorted by the priority field and the GIC
- * hardware support will take care of preemption of priority groups etc.
- *
- * Return negative if "a" sorts before "b", 0 to preserve order, and positive
- * to sort "b" before "a".
- */
-static int vgic_irq_cmp(void *priv, struct list_head *a, struct list_head *b)
-{
- struct vgic_irq *irqa = container_of(a, struct vgic_irq, ap_list);
- struct vgic_irq *irqb = container_of(b, struct vgic_irq, ap_list);
- bool penda, pendb;
- int ret;
-
- /*
- * list_sort may call this function with the same element when
- * the list is fairly long.
- */
- if (unlikely(irqa == irqb))
- return 0;
-
- raw_spin_lock(&irqa->irq_lock);
- raw_spin_lock_nested(&irqb->irq_lock, SINGLE_DEPTH_NESTING);
-
- if (irqa->active || irqb->active) {
- ret = (int)irqb->active - (int)irqa->active;
- goto out;
- }
-
- penda = irqa->enabled && irq_is_pending(irqa);
- pendb = irqb->enabled && irq_is_pending(irqb);
-
- if (!penda || !pendb) {
- ret = (int)pendb - (int)penda;
- goto out;
- }
-
- /* Both pending and enabled, sort by priority */
- ret = irqa->priority - irqb->priority;
-out:
- raw_spin_unlock(&irqb->irq_lock);
- raw_spin_unlock(&irqa->irq_lock);
- return ret;
-}
-
-/* Must be called with the ap_list_lock held */
-static void vgic_sort_ap_list(struct kvm_vcpu *vcpu)
-{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
-
- lockdep_assert_held(&vgic_cpu->ap_list_lock);
-
- list_sort(NULL, &vgic_cpu->ap_list_head, vgic_irq_cmp);
-}
-
-/*
- * Only valid injection if changing level for level-triggered IRQs or for a
- * rising edge, and in-kernel connected IRQ lines can only be controlled by
- * their owner.
- */
-static bool vgic_validate_injection(struct vgic_irq *irq, bool level, void *owner)
-{
- if (irq->owner != owner)
- return false;
-
- switch (irq->config) {
- case VGIC_CONFIG_LEVEL:
- return irq->line_level != level;
- case VGIC_CONFIG_EDGE:
- return level;
- }
-
- return false;
-}
-
-/*
- * Check whether an IRQ needs to (and can) be queued to a VCPU's ap list.
- * Do the queuing if necessary, taking the right locks in the right order.
- * Returns true when the IRQ was queued, false otherwise.
- *
- * Needs to be entered with the IRQ lock already held, but will return
- * with all locks dropped.
- */
-bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,
- unsigned long flags)
-{
- struct kvm_vcpu *vcpu;
-
- lockdep_assert_held(&irq->irq_lock);
-
-retry:
- vcpu = vgic_target_oracle(irq);
- if (irq->vcpu || !vcpu) {
- /*
- * If this IRQ is already on a VCPU's ap_list, then it
- * cannot be moved or modified and there is no more work for
- * us to do.
- *
- * Otherwise, if the irq is not pending and enabled, it does
- * not need to be inserted into an ap_list and there is also
- * no more work for us to do.
- */
- raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
-
- /*
- * We have to kick the VCPU here, because we could be
- * queueing an edge-triggered interrupt for which we
- * get no EOI maintenance interrupt. In that case,
- * while the IRQ is already on the VCPU's AP list, the
- * VCPU could have EOI'ed the original interrupt and
- * won't see this one until it exits for some other
- * reason.
- */
- if (vcpu) {
- kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
- kvm_vcpu_kick(vcpu);
- }
- return false;
- }
-
- /*
- * We must unlock the irq lock to take the ap_list_lock where
- * we are going to insert this new pending interrupt.
- */
- raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
-
- /* someone can do stuff here, which we re-check below */
-
- raw_spin_lock_irqsave(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
- raw_spin_lock(&irq->irq_lock);
-
- /*
- * Did something change behind our backs?
- *
- * There are two cases:
- * 1) The irq lost its pending state or was disabled behind our
- * backs and/or it was queued to another VCPU's ap_list.
- * 2) Someone changed the affinity on this irq behind our
- * backs and we are now holding the wrong ap_list_lock.
- *
- * In both cases, drop the locks and retry.
- */
-
- if (unlikely(irq->vcpu || vcpu != vgic_target_oracle(irq))) {
- raw_spin_unlock(&irq->irq_lock);
- raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock,
- flags);
-
- raw_spin_lock_irqsave(&irq->irq_lock, flags);
- goto retry;
- }
-
- /*
- * Grab a reference to the irq to reflect the fact that it is
- * now in the ap_list.
- */
- vgic_get_irq_kref(irq);
- list_add_tail(&irq->ap_list, &vcpu->arch.vgic_cpu.ap_list_head);
- irq->vcpu = vcpu;
-
- raw_spin_unlock(&irq->irq_lock);
- raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
-
- kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
- kvm_vcpu_kick(vcpu);
-
- return true;
-}
-
-/**
- * kvm_vgic_inject_irq - Inject an IRQ from a device to the vgic
- * @kvm: The VM structure pointer
- * @cpuid: The CPU for PPIs
- * @intid: The INTID to inject a new state to.
- * @level: Edge-triggered: true: to trigger the interrupt
- * false: to ignore the call
- * Level-sensitive true: raise the input signal
- * false: lower the input signal
- * @owner: The opaque pointer to the owner of the IRQ being raised to verify
- * that the caller is allowed to inject this IRQ. Userspace
- * injections will have owner == NULL.
- *
- * The VGIC is not concerned with devices being active-LOW or active-HIGH for
- * level-sensitive interrupts. You can think of the level parameter as 1
- * being HIGH and 0 being LOW and all devices being active-HIGH.
- */
-int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
- bool level, void *owner)
-{
- struct kvm_vcpu *vcpu;
- struct vgic_irq *irq;
- unsigned long flags;
- int ret;
-
- trace_vgic_update_irq_pending(cpuid, intid, level);
-
- ret = vgic_lazy_init(kvm);
- if (ret)
- return ret;
-
- vcpu = kvm_get_vcpu(kvm, cpuid);
- if (!vcpu && intid < VGIC_NR_PRIVATE_IRQS)
- return -EINVAL;
-
- irq = vgic_get_irq(kvm, vcpu, intid);
- if (!irq)
- return -EINVAL;
-
- raw_spin_lock_irqsave(&irq->irq_lock, flags);
-
- if (!vgic_validate_injection(irq, level, owner)) {
- /* Nothing to see here, move along... */
- raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
- vgic_put_irq(kvm, irq);
- return 0;
- }
-
- if (irq->config == VGIC_CONFIG_LEVEL)
- irq->line_level = level;
- else
- irq->pending_latch = true;
-
- vgic_queue_irq_unlock(kvm, irq, flags);
- vgic_put_irq(kvm, irq);
-
- return 0;
-}
-
-/* @irq->irq_lock must be held */
-static int kvm_vgic_map_irq(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
- unsigned int host_irq,
- bool (*get_input_level)(int vindid))
-{
- struct irq_desc *desc;
- struct irq_data *data;
-
- /*
- * Find the physical IRQ number corresponding to @host_irq
- */
- desc = irq_to_desc(host_irq);
- if (!desc) {
- kvm_err("%s: no interrupt descriptor\n", __func__);
- return -EINVAL;
- }
- data = irq_desc_get_irq_data(desc);
- while (data->parent_data)
- data = data->parent_data;
-
- irq->hw = true;
- irq->host_irq = host_irq;
- irq->hwintid = data->hwirq;
- irq->get_input_level = get_input_level;
- return 0;
-}
-
-/* @irq->irq_lock must be held */
-static inline void kvm_vgic_unmap_irq(struct vgic_irq *irq)
-{
- irq->hw = false;
- irq->hwintid = 0;
- irq->get_input_level = NULL;
-}
-
-int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
- u32 vintid, bool (*get_input_level)(int vindid))
-{
- struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
- unsigned long flags;
- int ret;
-
- BUG_ON(!irq);
-
- raw_spin_lock_irqsave(&irq->irq_lock, flags);
- ret = kvm_vgic_map_irq(vcpu, irq, host_irq, get_input_level);
- raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
- vgic_put_irq(vcpu->kvm, irq);
-
- return ret;
-}
-
-/**
- * kvm_vgic_reset_mapped_irq - Reset a mapped IRQ
- * @vcpu: The VCPU pointer
- * @vintid: The INTID of the interrupt
- *
- * Reset the active and pending states of a mapped interrupt. Kernel
- * subsystems injecting mapped interrupts should reset their interrupt lines
- * when we are doing a reset of the VM.
- */
-void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid)
-{
- struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
- unsigned long flags;
-
- if (!irq->hw)
- goto out;
-
- raw_spin_lock_irqsave(&irq->irq_lock, flags);
- irq->active = false;
- irq->pending_latch = false;
- irq->line_level = false;
- raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
-out:
- vgic_put_irq(vcpu->kvm, irq);
-}
-
-int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid)
-{
- struct vgic_irq *irq;
- unsigned long flags;
-
- if (!vgic_initialized(vcpu->kvm))
- return -EAGAIN;
-
- irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
- BUG_ON(!irq);
-
- raw_spin_lock_irqsave(&irq->irq_lock, flags);
- kvm_vgic_unmap_irq(irq);
- raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
- vgic_put_irq(vcpu->kvm, irq);
-
- return 0;
-}
-
-/**
- * kvm_vgic_set_owner - Set the owner of an interrupt for a VM
- *
- * @vcpu: Pointer to the VCPU (used for PPIs)
- * @intid: The virtual INTID identifying the interrupt (PPI or SPI)
- * @owner: Opaque pointer to the owner
- *
- * Returns 0 if intid is not already used by another in-kernel device and the
- * owner is set, otherwise returns an error code.
- */
-int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner)
-{
- struct vgic_irq *irq;
- unsigned long flags;
- int ret = 0;
-
- if (!vgic_initialized(vcpu->kvm))
- return -EAGAIN;
-
- /* SGIs and LPIs cannot be wired up to any device */
- if (!irq_is_ppi(intid) && !vgic_valid_spi(vcpu->kvm, intid))
- return -EINVAL;
-
- irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
- raw_spin_lock_irqsave(&irq->irq_lock, flags);
- if (irq->owner && irq->owner != owner)
- ret = -EEXIST;
- else
- irq->owner = owner;
- raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
-
- return ret;
-}
-
-/**
- * vgic_prune_ap_list - Remove non-relevant interrupts from the list
- *
- * @vcpu: The VCPU pointer
- *
- * Go over the list of "interesting" interrupts, and prune those that we
- * won't have to consider in the near future.
- */
-static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
-{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
- struct vgic_irq *irq, *tmp;
-
- DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
-
-retry:
- raw_spin_lock(&vgic_cpu->ap_list_lock);
-
- list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
- struct kvm_vcpu *target_vcpu, *vcpuA, *vcpuB;
- bool target_vcpu_needs_kick = false;
-
- raw_spin_lock(&irq->irq_lock);
-
- BUG_ON(vcpu != irq->vcpu);
-
- target_vcpu = vgic_target_oracle(irq);
-
- if (!target_vcpu) {
- /*
- * We don't need to process this interrupt any
- * further, move it off the list.
- */
- list_del(&irq->ap_list);
- irq->vcpu = NULL;
- raw_spin_unlock(&irq->irq_lock);
-
- /*
- * This vgic_put_irq call matches the
- * vgic_get_irq_kref in vgic_queue_irq_unlock,
- * where we added the LPI to the ap_list. As
- * we remove the irq from the list, we drop
- * also drop the refcount.
- */
- vgic_put_irq(vcpu->kvm, irq);
- continue;
- }
-
- if (target_vcpu == vcpu) {
- /* We're on the right CPU */
- raw_spin_unlock(&irq->irq_lock);
- continue;
- }
-
- /* This interrupt looks like it has to be migrated. */
-
- raw_spin_unlock(&irq->irq_lock);
- raw_spin_unlock(&vgic_cpu->ap_list_lock);
-
- /*
- * Ensure locking order by always locking the smallest
- * ID first.
- */
- if (vcpu->vcpu_id < target_vcpu->vcpu_id) {
- vcpuA = vcpu;
- vcpuB = target_vcpu;
- } else {
- vcpuA = target_vcpu;
- vcpuB = vcpu;
- }
-
- raw_spin_lock(&vcpuA->arch.vgic_cpu.ap_list_lock);
- raw_spin_lock_nested(&vcpuB->arch.vgic_cpu.ap_list_lock,
- SINGLE_DEPTH_NESTING);
- raw_spin_lock(&irq->irq_lock);
-
- /*
- * If the affinity has been preserved, move the
- * interrupt around. Otherwise, it means things have
- * changed while the interrupt was unlocked, and we
- * need to replay this.
- *
- * In all cases, we cannot trust the list not to have
- * changed, so we restart from the beginning.
- */
- if (target_vcpu == vgic_target_oracle(irq)) {
- struct vgic_cpu *new_cpu = &target_vcpu->arch.vgic_cpu;
-
- list_del(&irq->ap_list);
- irq->vcpu = target_vcpu;
- list_add_tail(&irq->ap_list, &new_cpu->ap_list_head);
- target_vcpu_needs_kick = true;
- }
-
- raw_spin_unlock(&irq->irq_lock);
- raw_spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock);
- raw_spin_unlock(&vcpuA->arch.vgic_cpu.ap_list_lock);
-
- if (target_vcpu_needs_kick) {
- kvm_make_request(KVM_REQ_IRQ_PENDING, target_vcpu);
- kvm_vcpu_kick(target_vcpu);
- }
-
- goto retry;
- }
-
- raw_spin_unlock(&vgic_cpu->ap_list_lock);
-}
-
-static inline void vgic_fold_lr_state(struct kvm_vcpu *vcpu)
-{
- if (kvm_vgic_global_state.type == VGIC_V2)
- vgic_v2_fold_lr_state(vcpu);
- else
- vgic_v3_fold_lr_state(vcpu);
-}
-
-/* Requires the irq_lock to be held. */
-static inline void vgic_populate_lr(struct kvm_vcpu *vcpu,
- struct vgic_irq *irq, int lr)
-{
- lockdep_assert_held(&irq->irq_lock);
-
- if (kvm_vgic_global_state.type == VGIC_V2)
- vgic_v2_populate_lr(vcpu, irq, lr);
- else
- vgic_v3_populate_lr(vcpu, irq, lr);
-}
-
-static inline void vgic_clear_lr(struct kvm_vcpu *vcpu, int lr)
-{
- if (kvm_vgic_global_state.type == VGIC_V2)
- vgic_v2_clear_lr(vcpu, lr);
- else
- vgic_v3_clear_lr(vcpu, lr);
-}
-
-static inline void vgic_set_underflow(struct kvm_vcpu *vcpu)
-{
- if (kvm_vgic_global_state.type == VGIC_V2)
- vgic_v2_set_underflow(vcpu);
- else
- vgic_v3_set_underflow(vcpu);
-}
-
-/* Requires the ap_list_lock to be held. */
-static int compute_ap_list_depth(struct kvm_vcpu *vcpu,
- bool *multi_sgi)
-{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
- struct vgic_irq *irq;
- int count = 0;
-
- *multi_sgi = false;
-
- lockdep_assert_held(&vgic_cpu->ap_list_lock);
-
- list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
- int w;
-
- raw_spin_lock(&irq->irq_lock);
- /* GICv2 SGIs can count for more than one... */
- w = vgic_irq_get_lr_count(irq);
- raw_spin_unlock(&irq->irq_lock);
-
- count += w;
- *multi_sgi |= (w > 1);
- }
- return count;
-}
-
-/* Requires the VCPU's ap_list_lock to be held. */
-static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
-{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
- struct vgic_irq *irq;
- int count;
- bool multi_sgi;
- u8 prio = 0xff;
-
- lockdep_assert_held(&vgic_cpu->ap_list_lock);
-
- count = compute_ap_list_depth(vcpu, &multi_sgi);
- if (count > kvm_vgic_global_state.nr_lr || multi_sgi)
- vgic_sort_ap_list(vcpu);
-
- count = 0;
-
- list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
- raw_spin_lock(&irq->irq_lock);
-
- /*
- * If we have multi-SGIs in the pipeline, we need to
- * guarantee that they are all seen before any IRQ of
- * lower priority. In that case, we need to filter out
- * these interrupts by exiting early. This is easy as
- * the AP list has been sorted already.
- */
- if (multi_sgi && irq->priority > prio) {
- _raw_spin_unlock(&irq->irq_lock);
- break;
- }
-
- if (likely(vgic_target_oracle(irq) == vcpu)) {
- vgic_populate_lr(vcpu, irq, count++);
-
- if (irq->source)
- prio = irq->priority;
- }
-
- raw_spin_unlock(&irq->irq_lock);
-
- if (count == kvm_vgic_global_state.nr_lr) {
- if (!list_is_last(&irq->ap_list,
- &vgic_cpu->ap_list_head))
- vgic_set_underflow(vcpu);
- break;
- }
- }
-
- vcpu->arch.vgic_cpu.used_lrs = count;
-
- /* Nuke remaining LRs */
- for ( ; count < kvm_vgic_global_state.nr_lr; count++)
- vgic_clear_lr(vcpu, count);
-}
-
-static inline bool can_access_vgic_from_kernel(void)
-{
- /*
- * GICv2 can always be accessed from the kernel because it is
- * memory-mapped, and VHE systems can access GICv3 EL2 system
- * registers.
- */
- return !static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif) || has_vhe();
-}
-
-static inline void vgic_save_state(struct kvm_vcpu *vcpu)
-{
- if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
- vgic_v2_save_state(vcpu);
- else
- __vgic_v3_save_state(vcpu);
-}
-
-/* Sync back the hardware VGIC state into our emulation after a guest's run. */
-void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
-{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
-
- /* An empty ap_list_head implies used_lrs == 0 */
- if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head))
- return;
-
- if (can_access_vgic_from_kernel())
- vgic_save_state(vcpu);
-
- if (vgic_cpu->used_lrs)
- vgic_fold_lr_state(vcpu);
- vgic_prune_ap_list(vcpu);
-}
-
-static inline void vgic_restore_state(struct kvm_vcpu *vcpu)
-{
- if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
- vgic_v2_restore_state(vcpu);
- else
- __vgic_v3_restore_state(vcpu);
-}
-
-/* Flush our emulation state into the GIC hardware before entering the guest. */
-void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
-{
- /*
- * If there are no virtual interrupts active or pending for this
- * VCPU, then there is no work to do and we can bail out without
- * taking any lock. There is a potential race with someone injecting
- * interrupts to the VCPU, but it is a benign race as the VCPU will
- * either observe the new interrupt before or after doing this check,
- * and introducing additional synchronization mechanism doesn't change
- * this.
- *
- * Note that we still need to go through the whole thing if anything
- * can be directly injected (GICv4).
- */
- if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head) &&
- !vgic_supports_direct_msis(vcpu->kvm))
- return;
-
- DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
-
- if (!list_empty(&vcpu->arch.vgic_cpu.ap_list_head)) {
- raw_spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock);
- vgic_flush_lr_state(vcpu);
- raw_spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
- }
-
- if (can_access_vgic_from_kernel())
- vgic_restore_state(vcpu);
-}
-
-void kvm_vgic_load(struct kvm_vcpu *vcpu)
-{
- if (unlikely(!vgic_initialized(vcpu->kvm)))
- return;
-
- if (kvm_vgic_global_state.type == VGIC_V2)
- vgic_v2_load(vcpu);
- else
- vgic_v3_load(vcpu);
-}
-
-void kvm_vgic_put(struct kvm_vcpu *vcpu)
-{
- if (unlikely(!vgic_initialized(vcpu->kvm)))
- return;
-
- if (kvm_vgic_global_state.type == VGIC_V2)
- vgic_v2_put(vcpu);
- else
- vgic_v3_put(vcpu);
-}
-
-void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu)
-{
- if (unlikely(!irqchip_in_kernel(vcpu->kvm)))
- return;
-
- if (kvm_vgic_global_state.type == VGIC_V2)
- vgic_v2_vmcr_sync(vcpu);
- else
- vgic_v3_vmcr_sync(vcpu);
-}
-
-int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
-{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
- struct vgic_irq *irq;
- bool pending = false;
- unsigned long flags;
- struct vgic_vmcr vmcr;
-
- if (!vcpu->kvm->arch.vgic.enabled)
- return false;
-
- if (vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last)
- return true;
-
- vgic_get_vmcr(vcpu, &vmcr);
-
- raw_spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
-
- list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
- raw_spin_lock(&irq->irq_lock);
- pending = irq_is_pending(irq) && irq->enabled &&
- !irq->active &&
- irq->priority < vmcr.pmr;
- raw_spin_unlock(&irq->irq_lock);
-
- if (pending)
- break;
- }
-
- raw_spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
-
- return pending;
-}
-
-void vgic_kick_vcpus(struct kvm *kvm)
-{
- struct kvm_vcpu *vcpu;
- int c;
-
- /*
- * We've injected an interrupt, time to find out who deserves
- * a good kick...
- */
- kvm_for_each_vcpu(c, vcpu, kvm) {
- if (kvm_vgic_vcpu_pending_irq(vcpu)) {
- kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
- kvm_vcpu_kick(vcpu);
- }
- }
-}
-
-bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid)
-{
- struct vgic_irq *irq;
- bool map_is_active;
- unsigned long flags;
-
- if (!vgic_initialized(vcpu->kvm))
- return false;
-
- irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
- raw_spin_lock_irqsave(&irq->irq_lock, flags);
- map_is_active = irq->hw && irq->active;
- raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
- vgic_put_irq(vcpu->kvm, irq);
-
- return map_is_active;
-}