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    Subject[PATCH v3 51/59] KVM: arm/arm64: GICv4: Add doorbell interrupt handling
    Date
    When a vPE is not running, a VLPI being made pending results in a
    doorbell interrupt being delivered. Let's handle this interrupt
    and update the pending_last flag that indicates that VLPIs are
    pending. The corresponding vcpu is also kicked into action.

    Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
    ---
    virt/kvm/arm/vgic/vgic-v4.c | 34 ++++++++++++++++++++++++++++++++++
    1 file changed, 34 insertions(+)

    diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c
    index 534d3051a078..6af3cde6d7d4 100644
    --- a/virt/kvm/arm/vgic/vgic-v4.c
    +++ b/virt/kvm/arm/vgic/vgic-v4.c
    @@ -21,6 +21,19 @@

    #include "vgic.h"

    +static irqreturn_t vgic_v4_doorbell_handler(int irq, void *info)
    +{
    + struct kvm_vcpu *vcpu = info;
    +
    + if (!kvm_vgic_vcpu_pending_irq(vcpu)) {
    + vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last = true;
    + kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
    + kvm_vcpu_kick(vcpu);
    + }
    +
    + return IRQ_HANDLED;
    +}
    +
    int vgic_v4_init(struct kvm *kvm)
    {
    struct vgic_dist *dist = &kvm->arch.vgic;
    @@ -57,16 +70,37 @@ int vgic_v4_init(struct kvm *kvm)
    return ret;
    }

    + kvm_for_each_vcpu(i, vcpu, kvm) {
    + int irq = dist->its_vm.vpes[i]->irq;
    +
    + ret = request_irq(irq, vgic_v4_doorbell_handler,
    + 0, "vcpu", vcpu);
    + if (ret) {
    + kvm_err("failed to allocate vcpu IRQ%d\n", irq);
    + dist->its_vm.nr_vpes = i;
    + break;
    + }
    + }
    +
    + if (ret)
    + vgic_v4_teardown(kvm);
    +
    return ret;
    }

    void vgic_v4_teardown(struct kvm *kvm)
    {
    struct its_vm *its_vm = &kvm->arch.vgic.its_vm;
    + int i;

    if (!its_vm->vpes)
    return;

    + for (i = 0; i < its_vm->nr_vpes; i++) {
    + struct kvm_vcpu *vcpu = kvm_get_vcpu(kvm, i);
    + free_irq(its_vm->vpes[i]->irq, vcpu);
    + }
    +
    its_free_vcpu_irqs(its_vm);
    kfree(its_vm->vpes);
    its_vm->nr_vpes = 0;
    --
    2.11.0
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