From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Zyngier Subject: [PATCH v3 51/59] KVM: arm/arm64: GICv4: Add doorbell interrupt handling Date: Mon, 31 Jul 2017 18:26:29 +0100 Message-ID: <20170731172637.29355-52-marc.zyngier@arm.com> References: <20170731172637.29355-1-marc.zyngier@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Jason Cooper , Thomas Gleixner To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Return-path: In-Reply-To: <20170731172637.29355-1-marc.zyngier@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu List-Id: kvm.vger.kernel.org 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 --- 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