[PATCH v3 5/9] KVM: arm/arm64: vgic: Signal IRQs using their configured group

[Christoffer Dall <christoffer.dall@arm.com>]

Now when we have a group configuration on the struct IRQ, use this state
when populating the LR and signaling interrupts as either group 0 or
group 1 to the VM.  Depending on the model of the emulated GIC, and the
guest's configuration of the VMCR, interrupts may be signaled as IRQs or
FIQs to the VM.

Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
---
 include/linux/irqchip/arm-gic.h | 1 +
 virt/kvm/arm/vgic/vgic-v2.c     | 3 +++
 virt/kvm/arm/vgic/vgic-v3.c     | 6 +-----
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
index 484f5bf..6c4aaf0 100644
--- a/include/linux/irqchip/arm-gic.h
+++ b/include/linux/irqchip/arm-gic.h
@@ -104,6 +104,7 @@
 #define GICH_LR_PENDING_BIT            (1 << 28)
 #define GICH_LR_ACTIVE_BIT             (1 << 29)
 #define GICH_LR_EOI                    (1 << 19)
+#define GICH_LR_GROUP1                 (1 << 30)
 #define GICH_LR_HW                     (1 << 31)

 #define GICH_VMCR_ENABLE_GRP0_SHIFT    0
diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c
index a5f2e44..df5e6a6 100644
--- a/virt/kvm/arm/vgic/vgic-v2.c
+++ b/virt/kvm/arm/vgic/vgic-v2.c
@@ -159,6 +159,9 @@ void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
                }
        }

+       if (irq->group)
+               val |= GICH_LR_GROUP1;
+
        if (irq->hw) {
                val |= GICH_LR_HW;
                val |= irq->hwintid << GICH_LR_PHYSID_CPUID_SHIFT;
diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
index cdce653..530b849 100644
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -197,11 +197,7 @@ void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
        if (vgic_irq_is_mapped_level(irq) && (val & ICH_LR_PENDING_BIT))
                irq->line_level = false;

-       /*
-        * We currently only support Group1 interrupts, which is a
-        * known defect. This needs to be addressed at some point.
-        */
-       if (model == KVM_DEV_TYPE_ARM_VGIC_V3)
+       if (irq->group)
                val |= ICH_LR_GROUP;

        val |= (u64)irq->priority << ICH_LR_PRIORITY_SHIFT;
--
2.7.4

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