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@amd.com>
> Acked-by: Henry Wang <Henry.Wang@arm.com>
> Reviewed-by: Michal Orzel <michal.orzel@amd.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
> ---
> 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
>