KVM: arm/arm64: vgic: Convert struct vgic_lr to use bitfields

As we're about to cram more information in the vgic_lr structure
(HW interrupt number and additional state information), we switch
to a layout similar to the HW's:

- use bitfields to save space (we don't need more than 10 bits
  to represent the irq numbers)
- source CPU and HW interrupt can share the same field, as
  a SGI doesn't have a physical line.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 133ea00aa83bc8926137ca8867f28a4ab9469d27..a881e398d3e571a32850e6d515497dbea5c54355 100644 (file)
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -95,11 +95,15 @@ enum vgic_type {
 #define LR_STATE_ACTIVE                (1 << 1)
 #define LR_STATE_MASK          (3 << 0)
 #define LR_EOI_INT             (1 << 2)
+#define LR_HW                  (1 << 3)
 
 struct vgic_lr {
-       u16     irq;
-       u8      source;
-       u8      state;
+       unsigned irq:10;
+       union {
+               unsigned hwirq:10;
+               unsigned source:3;
+       };
+       unsigned state:4;
 };
 
 struct vgic_vmcr {