linux-kernel - [PATCH v2 48/52] KVM: arm/arm64: GICv4: Add doorbell interrupt handling

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Date:   Wed, 28 Jun 2017 16:04:07 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu
Cc:     Christoffer Dall <christoffer.dall@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Eric Auger <eric.auger@...hat.com>,
        Shanker Donthineni <shankerd@...eaurora.org>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH v2 48/52] KVM: arm/arm64: GICv4: Add doorbell interrupt handling

When a vPE is not running, the delivery of a VLPI results in a
doorbell interrupt to be delivered. Let's handle this interrupt
and update the pending_last flag that indicates that VLPIs are
pending.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 virt/kvm/arm/vgic/vgic-v4.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c
index a2d1a6db0490..fe0d0a8ed469 100644
--- a/virt/kvm/arm/vgic/vgic-v4.c
+++ b/virt/kvm/arm/vgic/vgic-v4.c
@@ -21,6 +21,14 @@
 
 #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;
+	return IRQ_HANDLED;
+}
+
 int vgic_v4_init(struct kvm *kvm)
 {
 	struct vgic_dist *dist = &kvm->arch.vgic;
@@ -47,12 +55,34 @@ 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;
+	struct kvm_vcpu *vcpu;
+	int i;
+
+	for (i = 0; i < its_vm->nr_vpes; i++) {
+		vcpu = kvm_get_vcpu(kvm, i);
+		free_irq(its_vm->vpes[i]->irq, vcpu);
+	}
 
 	its_free_vcpu_irqs(its_vm);
 	kfree(its_vm->vpes);
-- 
2.11.0