Implements kvm_vgic_[set|unset]_forwarding.
Handle low-level VGIC programming and consistent irqchip
programming.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
v1 -> v2:
- change the parameter names used in the declaration
- use kvm_vgic_map/unmap_phys_irq and handle their returned value
---
include/kvm/arm_vgic.h | 5 +++
virt/kvm/arm/vgic/vgic.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 93 insertions(+)
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index cceb31d..5064a57 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -343,4 +343,9 @@ int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);
*/
int kvm_vgic_setup_default_irq_routing(struct kvm *kvm);
+int kvm_vgic_set_forwarding(struct kvm *kvm, unsigned int host_irq,
+ unsigned int vintid);
+void kvm_vgic_unset_forwarding(struct kvm *kvm, unsigned int host_irq,
+ unsigned int vintid);
+
#endif /* __KVM_ARM_VGIC_H */
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index 2e35ac7..9ee3e77 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -781,3 +781,91 @@ bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid)
return map_is_active;
}
+/**
+ * kvm_vgic_set_forwarding - Set IRQ forwarding
+ *
+ * @kvm: kvm handle
+ * @host_irq: the host linux IRQ
+ * @vintid: the virtual INTID
+ *
+ * This function must be called when the IRQ is not active:
+ * ie. not active at GIC level and not currently under injection
+ * into the guest using the unforwarded mode. The physical IRQ must
+ * be disabled and all vCPUs must have been exited and prevented
+ * from being re-entered.
+ */
+int kvm_vgic_set_forwarding(struct kvm *kvm, unsigned int host_irq,
+ unsigned int vintid)
+{
+ struct kvm_vcpu *vcpu;
+ struct vgic_irq *irq;
+ int ret;
+
+ kvm_debug("%s host_irq=%d vintid=%d\n", __func__, host_irq, vintid);
+
+ if (!vgic_valid_spi(kvm, vintid))
+ return -EINVAL;
+
+ irq = vgic_get_irq(kvm, NULL, vintid);
+ spin_lock(&irq->irq_lock);
+
+ if (irq->hw) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+ vcpu = irq->target_vcpu;
+ if (!vcpu) {
+ ret = -EAGAIN;
+ goto unlock;
+ }
+
+ ret = kvm_vgic_map_irq(vcpu, irq, host_irq);
+ if (!ret)
+ irq_set_vcpu_affinity(host_irq, vcpu);
+unlock:
+ spin_unlock(&irq->irq_lock);
+ vgic_put_irq(kvm, irq);
+ return ret;
+}
+
+/**
+ * kvm_vgic_unset_forwarding - Unset IRQ forwarding
+ *
+ * @kvm: KVM handle
+ * @host_irq: the host Linux IRQ number
+ * @vintid: virtual INTID
+ *
+ * This function must be called when the host irq is disabled and
+ * all vCPUs have been exited and prevented from being re-entered.
+ */
+void kvm_vgic_unset_forwarding(struct kvm *kvm,
+ unsigned int host_irq,
+ unsigned int vintid)
+{
+ struct vgic_irq *irq;
+ bool active;
+
+ kvm_debug("%s host_irq=%d vintid=%d\n", __func__, host_irq, vintid);
+
+ if (!vgic_valid_spi(kvm, vintid))
+ return;
+
+ irq = vgic_get_irq(kvm, NULL, vintid);
+ spin_lock(&irq->irq_lock);
+
+ if (!irq->hw)
+ goto unlock;
+
+ WARN_ON(irq_get_irqchip_state(host_irq, IRQCHIP_STATE_ACTIVE, &active));
+
+ if (active)
+ irq_set_irqchip_state(host_irq, IRQCHIP_STATE_ACTIVE, false);
+
+ kvm_vgic_unmap_irq(irq);
+ irq_set_vcpu_affinity(host_irq, NULL);
+
+unlock:
+ spin_unlock(&irq->irq_lock);
+ vgic_put_irq(kvm, irq);
+}
+
--
2.5.5
