One can now use GICv3 on AArch32 systems. However, ITS is not supported.
The reason being currently we are trying to validate GICv3 on an AArch32_v8R
system. Refer ARM DDI 0568A.c ID110520, B1.3.1,
"A Generic Interrupt Controller (GIC) implemented with an Armv8-R PE must not
implement LPI support."
By default GICv3 is disabled on AArch32 and enabled on AArch64.
Updated SUPPORT.md to state that GICv3 on Arm32 is not security supported.
Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
---
Changed from :-
v1 - 1. Remove "ARM_64 || ARM_32" as it is always true.
2. Updated SUPPORT.md.
v2 - 1. GICv3 is enabled by default only on ARM_64.
2. Updated SUPPORT.md.
v3 - 1. GICv3 is not selected by ARM_64. Rather, it is optionally
enabled.
2. GICv3 is disabled by default on ARM_32.
SUPPORT.md | 7 +++++++
xen/arch/arm/Kconfig | 9 +++++----
xen/arch/arm/include/asm/cpufeature.h | 1 +
3 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/SUPPORT.md b/SUPPORT.md
index ab71464cf6..295369998e 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -76,6 +76,13 @@ For the Cortex A57 r0p0 - r1p1, see Errata 832075.
Status, ARM SMMUv3: Tech Preview
Status, Renesas IPMMU-VMSA: Supported, not security supported
+### ARM/GICv3
+
+GICv3 is an interrupt controller specification designed by Arm.
+
+ Status, Arm64: Security supported
+ Status, Arm32: Supported, not security supported
+
### ARM/GICv3 ITS
Extension to the GICv3 interrupt controller to support MSI.
diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index 52a05f704d..9d0c45f892 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -41,16 +41,17 @@ config ARM_EFI
config GICV3
bool "GICv3 driver"
- depends on ARM_64 && !NEW_VGIC
- default y
+ depends on !NEW_VGIC
+ default n if ARM_32
+ default y if ARM_64
---help---
Driver for the ARM Generic Interrupt Controller v3.
- If unsure, say Y
+ If unsure, say N for ARM_32 and Y for ARM_64
