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[XEN v2 12/12] xen/Arm: GICv3: Enable GICv3 for AArch32

From: Ayan Kumar Halder <ayankuma@xxxxxxx>

Date: Mon, 31 Oct 2022 15:13:26 +0000

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Cc: <sstabellini@xxxxxxxxxx>, <stefanos@xxxxxxxxxx>, <julien@xxxxxxx>, <Volodymyr_Babchuk@xxxxxxxx>, <bertrand.marquis@xxxxxxx>, <burzalodowa@xxxxxxxxx>, Ayan Kumar Halder <ayankuma@xxxxxxx>

Delivery-date: Mon, 31 Oct 2022 15:14:27 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Refer ARM DDI 0487G.b ID072021, D13.2.86 - ID_PFR1_EL1, AArch32 Processor Feature Register 1 GIC, bits[31:28] == 0b0001 for GIC3.0 on Aarch32 One can now enable 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." Updated SUPPORT.md. Signed-off-by: Ayan Kumar Halder <ayankuma@xxxxxxx> --- Changed from :- v1 - 1. Remove "ARM_64 || ARM_32" as it is always true. 2. Updated SUPPORT.md. SUPPORT.md | 6 ++++++ xen/arch/arm/Kconfig | 4 ++-- xen/arch/arm/include/asm/cpufeature.h | 1 + 3 files changed, 9 insertions(+), 2 deletions(-) diff --git a/SUPPORT.md b/SUPPORT.md index cf2ddfacaf..0137855c66 100644 --- a/SUPPORT.md +++ b/SUPPORT.md @@ -82,6 +82,12 @@ Extension to the GICv3 interrupt controller to support MSI. Status: Experimental +### ARM/GICv3 + AArch32 ARM v8 + +GICv3 is supported on AArch32 ARMv8 (besides AArch64) + + Status: Supported, not security supported + ## Guest Type ### x86/PV diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig index 1fe5faf847..7c3c6eb3bd 100644 --- a/xen/arch/arm/Kconfig +++ b/xen/arch/arm/Kconfig @@ -41,7 +41,7 @@ config ARM_EFI config GICV3 bool "GICv3 driver" - depends on ARM_64 && !NEW_VGIC + depends on !NEW_VGIC default y ---help--- @@ -50,7 +50,7 @@ config GICV3 config HAS_ITS bool "GICv3 ITS MSI controller support (UNSUPPORTED)" if UNSUPPORTED - depends on GICV3 && !NEW_VGIC + depends on GICV3 && !NEW_VGIC && !ARM_32 config HVM def_bool y diff --git a/xen/arch/arm/include/asm/cpufeature.h b/xen/arch/arm/include/asm/cpufeature.h index c86a2e7f29..c62cf6293f 100644 --- a/xen/arch/arm/include/asm/cpufeature.h +++ b/xen/arch/arm/include/asm/cpufeature.h @@ -33,6 +33,7 @@ #define cpu_has_aarch32 (cpu_has_arm || cpu_has_thumb) #ifdef CONFIG_ARM_32 +#define cpu_has_gicv3 (boot_cpu_feature32(gic) >= 1) #define cpu_has_gentimer (boot_cpu_feature32(gentimer) == 1) /* * On Armv7, the value 0 is used to indicate that PMUv2 is not -- 2.17.1

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