[PATCH v4 21/56] KVM: arm/arm64: vgic-new: Implement kvm_vgic_vcpu_pending_irq
From: andre.przywara@arm.com (Andre Przywara)
Date: 2016-05-16 09:53:09
Also in:
kvm, kvmarm
Subsystem:
kernel virtual machine (kvm), the rest · Maintainers:
Paolo Bonzini, Linus Torvalds
From: Eric Auger <redacted> Tell KVM whether a particular VCPU has an IRQ that needs handling in the guest. This is used to decide whether a VCPU is runnable. Signed-off-by: Eric Auger <redacted> Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Christoffer Dall <redacted> Reviewed-by: Marc Zyngier <redacted> --- Changelog RFC..v1: - return false if distributor is disabled - add vgic_kick_vcpus() implementations Changelog v2 .. v3: - remove vgic_kick_vcpus() implementation from this patch include/kvm/vgic/vgic.h | 2 ++ virt/kvm/arm/vgic/vgic.c | 25 +++++++++++++++++++++++++ 2 files changed, 27 insertions(+)
diff --git a/include/kvm/vgic/vgic.h b/include/kvm/vgic/vgic.h
index 9506267..f663288 100644
--- a/include/kvm/vgic/vgic.h
+++ b/include/kvm/vgic/vgic.h@@ -184,6 +184,8 @@ struct vgic_cpu { int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid, bool level); +int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu); + #define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel)) #define vgic_initialized(k) (false) #define vgic_ready(k) ((k)->arch.vgic.ready)
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index eca3cd0..bea8d3b 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c@@ -519,3 +519,28 @@ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) vgic_flush_lr_state(vcpu); spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock); } + +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; + + if (!vcpu->kvm->arch.vgic.enabled) + return false; + + spin_lock(&vgic_cpu->ap_list_lock); + + list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) { + spin_lock(&irq->irq_lock); + pending = irq->pending && irq->enabled; + spin_unlock(&irq->irq_lock); + + if (pending) + break; + } + + spin_unlock(&vgic_cpu->ap_list_lock); + + return pending; +}
--
2.8.2