diff options
Diffstat (limited to 'virt/kvm/arm/vgic/vgic-v4.c')
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-v4.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c index 2edfe23c8238..796e00c77903 100644 --- a/virt/kvm/arm/vgic/vgic-v4.c +++ b/virt/kvm/arm/vgic/vgic-v4.c @@ -16,12 +16,24 @@ */ #include <linux/interrupt.h> +#include <linux/irq.h> #include <linux/irqdomain.h> #include <linux/kvm_host.h> #include <linux/irqchip/arm-gic-v3.h> #include "vgic.h" +static irqreturn_t vgic_v4_doorbell_handler(int irq, void *info) +{ + struct kvm_vcpu *vcpu = info; + + 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; +} + /** * vgic_v4_init - Initialize the GICv4 data structures * @kvm: Pointer to the VM being initialized @@ -61,6 +73,33 @@ int vgic_v4_init(struct kvm *kvm) return ret; } + kvm_for_each_vcpu(i, vcpu, kvm) { + int irq = dist->its_vm.vpes[i]->irq; + + /* + * Don't automatically enable the doorbell, as we're + * flipping it back and forth when the vcpu gets + * blocked. Also disable the lazy disabling, as the + * doorbell could kick us out of the guest too + * early... + */ + irq_set_status_flags(irq, IRQ_NOAUTOEN | IRQ_DISABLE_UNLAZY); + ret = request_irq(irq, vgic_v4_doorbell_handler, + 0, "vcpu", vcpu); + if (ret) { + kvm_err("failed to allocate vcpu IRQ%d\n", irq); + /* + * Trick: adjust the number of vpes so we know + * how many to nuke on teardown... + */ + dist->its_vm.nr_vpes = i; + break; + } + } + + if (ret) + vgic_v4_teardown(kvm); + return ret; } @@ -73,10 +112,19 @@ int vgic_v4_init(struct kvm *kvm) 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); + int irq = its_vm->vpes[i]->irq; + + irq_clear_status_flags(irq, IRQ_NOAUTOEN | IRQ_DISABLE_UNLAZY); + free_irq(irq, vcpu); + } + its_free_vcpu_irqs(its_vm); kfree(its_vm->vpes); its_vm->nr_vpes = 0; |