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authorChristoffer Dall <christoffer.dall@arm.com>2018-07-16 16:06:18 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2018-07-21 18:02:19 +0300
commita2dca217dae29c4ff6420e8c78d56b3f61ae0797 (patch)
tree200738d26872550c7bd7de4850b96c9ca9f622ae
parent9bc03f1df31a3228289d5046780071ab8e91aa1a (diff)
downloadlinux-a2dca217dae29c4ff6420e8c78d56b3f61ae0797.tar.xz
KVM: arm/arm64: vgic: Define GICD_IIDR fields for GICv2 and GIv3
Instead of hardcoding the shifts and masks in the GICD_IIDR register emulation, let's add the definition of these fields to the GIC header files and use them. This will make things more obvious when we're going to bump the revision in the IIDR when we'll make guest-visible changes to the implementation. Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Christoffer Dall <christoffer.dall@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
-rw-r--r--include/linux/irqchip/arm-gic-v3.h10
-rw-r--r--include/linux/irqchip/arm-gic.h10
-rw-r--r--virt/kvm/arm/vgic/vgic-mmio-v2.c3
-rw-r--r--virt/kvm/arm/vgic/vgic-mmio-v3.c3
4 files changed, 24 insertions, 2 deletions
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index cbb872c1b607..b22f9dfa61af 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -61,6 +61,16 @@
#define GICD_CTLR_ENABLE_G1A (1U << 1)
#define GICD_CTLR_ENABLE_G1 (1U << 0)
+#define GICD_IIDR_IMPLEMENTER_SHIFT 0
+#define GICD_IIDR_IMPLEMENTER_MASK (0xfff << GICD_IIDR_IMPLEMENTER_SHIFT)
+#define GICD_IIDR_REVISION_SHIFT 12
+#define GICD_IIDR_REVISION_MASK (0xf << GICD_IIDR_REVISION_SHIFT)
+#define GICD_IIDR_VARIANT_SHIFT 16
+#define GICD_IIDR_VARIANT_MASK (0xf << GICD_IIDR_VARIANT_SHIFT)
+#define GICD_IIDR_PRODUCT_ID_SHIFT 24
+#define GICD_IIDR_PRODUCT_ID_MASK (0xff << GICD_IIDR_PRODUCT_ID_SHIFT)
+
+
/*
* In systems with a single security state (what we emulate in KVM)
* the meaning of the interrupt group enable bits is slightly different
diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
index 68d8b1f73682..484f5bfa9f3d 100644
--- a/include/linux/irqchip/arm-gic.h
+++ b/include/linux/irqchip/arm-gic.h
@@ -71,6 +71,16 @@
(GICD_INT_DEF_PRI << 8) |\
GICD_INT_DEF_PRI)
+#define GICD_IIDR_IMPLEMENTER_SHIFT 0
+#define GICD_IIDR_IMPLEMENTER_MASK (0xfff << GICD_IIDR_IMPLEMENTER_SHIFT)
+#define GICD_IIDR_REVISION_SHIFT 12
+#define GICD_IIDR_REVISION_MASK (0xf << GICD_IIDR_REVISION_SHIFT)
+#define GICD_IIDR_VARIANT_SHIFT 16
+#define GICD_IIDR_VARIANT_MASK (0xf << GICD_IIDR_VARIANT_SHIFT)
+#define GICD_IIDR_PRODUCT_ID_SHIFT 24
+#define GICD_IIDR_PRODUCT_ID_MASK (0xff << GICD_IIDR_PRODUCT_ID_SHIFT)
+
+
#define GICH_HCR 0x0
#define GICH_VTR 0x4
#define GICH_VMCR 0x8
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c
index ffc587bf4742..af44e569373a 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v2.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c
@@ -37,7 +37,8 @@ static unsigned long vgic_mmio_read_v2_misc(struct kvm_vcpu *vcpu,
value |= (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
break;
case GIC_DIST_IIDR:
- value = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
+ value = (PRODUCT_ID_KVM << GICD_IIDR_PRODUCT_ID_SHIFT) |
+ (IMPLEMENTER_ARM << GICD_IIDR_IMPLEMENTER_SHIFT);
break;
default:
return 0;
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index 287784095b5b..c03f42409b98 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -81,7 +81,8 @@ static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu,
}
break;
case GICD_IIDR:
- value = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
+ value = (PRODUCT_ID_KVM << GICD_IIDR_PRODUCT_ID_SHIFT) |
+ (IMPLEMENTER_ARM << GICD_IIDR_IMPLEMENTER_SHIFT);
break;
default:
return 0;