Re: [XEN][PATCH v11 05/20] xen/arm: Add CONFIG_OVERLAY_DTB

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Thu, 31 Aug 2023, Vikram Garhwal wrote:
> Introduce a config option where the user can enable support for 
> adding/removing
> device tree nodes using a device tree binary overlay.
> 
> Update SUPPORT.md and CHANGELOG.md to state the Device Tree Overlays support 
> for
> Arm.
> 
> Signed-off-by: Vikram Garhwal <vikram.garhwal@xxxxxxx>
> Acked-by: Henry Wang <Henry.Wang@xxxxxxx>
> Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>

Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>



> ---
> Changes from v9:
>     Fix style.
> Changes from v7:
>     Add this feature as "experimental support" in CHANGELOG.md
> ---
> ---
>  CHANGELOG.md         | 2 ++
>  SUPPORT.md           | 6 ++++++
>  xen/arch/arm/Kconfig | 5 +++++
>  3 files changed, 13 insertions(+)
> 
> diff --git a/CHANGELOG.md b/CHANGELOG.md
> index 2516526589..24636b8eaf 100644
> --- a/CHANGELOG.md
> +++ b/CHANGELOG.md
> @@ -27,6 +27,8 @@ The format is based on [Keep a 
> Changelog](https://keepachangelog.com/en/1.0.0/)
>   - On Arm, add suport for Firmware Framework for Arm A-profile (FF-A) 
> Mediator
>     (Tech Preview)
>   - Add Intel Hardware P-States (HWP) cpufreq driver.
> + - On Arm, experimental support for dynamic addition/removal of Xen device 
> tree
> +   nodes using a device tree overlay binary (.dtbo).
>  
>  ### Removed
>   - On x86, the "pku" command line option has been removed.  It has never
> diff --git a/SUPPORT.md b/SUPPORT.md
> index 6ce0ec29b0..3461f5cf2f 100644
> --- a/SUPPORT.md
> +++ b/SUPPORT.md
> @@ -855,6 +855,12 @@ xen/arch/arm/tee/ffa.c for limitations.
>  
>      Status: Supported
>  
> +### Device Tree Overlays
> +
> +Add/Remove device tree nodes using a device tree overlay binary (.dtbo).
> +
> +    Status, ARM: Experimental
> +
>  ### ARM: Guest ACPI support
>  
>      Status: Supported
> diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
> index 57bd1d01d7..650aca99ac 100644
> --- a/xen/arch/arm/Kconfig
> +++ b/xen/arch/arm/Kconfig
> @@ -92,6 +92,11 @@ config HAS_ITS
>          bool "GICv3 ITS MSI controller support (UNSUPPORTED)" if UNSUPPORTED
>          depends on GICV3 && !NEW_VGIC && !ARM_32
>  
> +config OVERLAY_DTB
> +     bool "DTB overlay support (UNSUPPORTED)" if UNSUPPORTED
> +     help
> +       Dynamic addition/removal of Xen device tree nodes using a dtbo.
> +
>  config HVM
>          def_bool y
>  
> -- 
> 2.17.1
>