[RFC PATCH 17/45] KVM: arm/arm64: vgic-new: Add PRIORITY registers handlers

[Andre Przywara]

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
 virt/kvm/arm/vgic/vgic_mmio.c | 46 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic/vgic_mmio.c b/virt/kvm/arm/vgic/vgic_mmio.c
index 8514f92..788e186 100644
--- a/virt/kvm/arm/vgic/vgic_mmio.c
+++ b/virt/kvm/arm/vgic/vgic_mmio.c
@@ -289,6 +289,50 @@ static int vgic_mmio_write_cpending(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
+static int vgic_mmio_read_priority(struct kvm_vcpu *vcpu,
+				   struct kvm_io_device *this,
+				   gpa_t addr, int len, void *val)
+{
+	struct vgic_io_device *iodev = container_of(this,
+						    struct vgic_io_device, dev);
+	u32 intid = (addr - iodev->base_addr);
+	int i;
+
+	if (iodev->redist_vcpu)
+		vcpu = iodev->redist_vcpu;
+
+	for (i = 0; i < len; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		((u8 *)val)[i] = irq->priority;
+	}
+
+	return 0;
+}
+
+static int vgic_mmio_write_priority(struct kvm_vcpu *vcpu,
+				    struct kvm_io_device *this,
+				    gpa_t addr, int len, const void *val)
+{
+	struct vgic_io_device *iodev = container_of(this,
+						    struct vgic_io_device, dev);
+	u32 intid = (addr - iodev->base_addr);
+	int i;
+
+	if (iodev->redist_vcpu)
+		vcpu = iodev->redist_vcpu;
+
+	for (i = 0; i < len; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		spin_lock(&irq->irq_lock);
+		irq->priority = ((u8 *)val)[i];
+		spin_unlock(&irq->irq_lock);
+	}
+
+	return 0;
+}
+
 struct vgic_register_region vgic_v2_dist_registers[] = {
 	REGISTER_DESC_WITH_LENGTH(GIC_DIST_CTRL,
 		vgic_mmio_read_v2_misc, vgic_mmio_write_v2_misc, 12),
@@ -307,7 +351,7 @@ struct vgic_register_region vgic_v2_dist_registers[] = {
 	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_CLEAR,
 		vgic_mmio_read_nyi, vgic_mmio_write_nyi, 1),
 	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PRI,
-		vgic_mmio_read_nyi, vgic_mmio_write_nyi, 8),
+		vgic_mmio_read_priority, vgic_mmio_write_priority, 8),
 	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_TARGET,
 		vgic_mmio_read_nyi, vgic_mmio_write_nyi, 8),
 	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_CONFIG,
-- 
2.7.3