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Re: [XEN v1] GICv3: Emulate GICD_IGRPMODR as RAZ / WI
- To: Ayan Kumar Halder <ayankuma@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Wed, 19 Oct 2022 17:49:28 +0200
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- Delivery-date: Wed, 19 Oct 2022 15:49:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Ayan,
On 19/10/2022 16:36, Ayan Kumar Halder wrote:
>
>
> Refer GIC v3 specification (Arm IHI 0069H ID020922), IGRPMODR (similar to
> IGROUPR) is relevant only when the guests run in secure/non-secure mode.
> As Xen does not implement security extensions for guests, so the registers
> are emulated as read as zero/write ignore.
>
> Signed-off-by: Ayan Kumar Halder <ayankuma@xxxxxxx>
> ---
>
> Observed the issue while running Zephyr on R52.
> Also, found that KVM has similar behaviour.
>
> xen/arch/arm/include/asm/gic.h | 2 ++
> xen/arch/arm/vgic-v3.c | 4 ++++
> 2 files changed, 6 insertions(+)
>
> diff --git a/xen/arch/arm/include/asm/gic.h b/xen/arch/arm/include/asm/gic.h
> index 76e3fa5dc4..998dd62651 100644
> --- a/xen/arch/arm/include/asm/gic.h
> +++ b/xen/arch/arm/include/asm/gic.h
> @@ -48,6 +48,8 @@
> #define GICD_ICFGR1 (0xC04)
> #define GICD_ICFGR2 (0xC08)
> #define GICD_ICFGRN (0xCFC)
> +#define GICD_IGRPMODR (0xD00)
> +#define GICD_IGRPMODRN (0xD7C)
These registers are GICv3 specific and as such should be defined
in arch/arm/include/asm/gic_v3_defs.h.
~Michal
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