Re: [XEN][PATCH v6 15/19] xen/arm: Implement device tree node removal functionalities

[Jan Beulich <jbeulich@xxxxxxxx>]

On 03.05.2023 01:36, Vikram Garhwal wrote:
> Introduce sysctl XEN_SYSCTL_dt_overlay to remove device-tree nodes added using
> device tree overlay.
> 
> xl dt-overlay remove file.dtbo:
>     Removes all the nodes in a given dtbo.
>     First, removes IRQ permissions and MMIO accesses. Next, it finds the nodes
>     in dt_host and delete the device node entries from dt_host.
> 
>     The nodes get removed only if it is not used by any of dom0 or domio.
> 
> Also, added overlay_track struct to keep the track of added node through 
> device
> tree overlay. overlay_track has dt_host_new which is unflattened form of 
> updated
> fdt and name of overlay nodes. When a node is removed, we also free the memory
> used by overlay_track for the particular overlay node.
> 
> Nested overlay removal is supported in sequential manner only i.e. if
> overlay_child nests under overlay_parent, it is assumed that user first 
> removes
> overlay_child and then removes overlay_parent.
> 
> Signed-off-by: Vikram Garhwal <vikram.garhwal@xxxxxxx>
> ---
>  xen/arch/arm/sysctl.c        |  16 +-
>  xen/common/Makefile          |   1 +
>  xen/common/dt-overlay.c      | 419 +++++++++++++++++++++++++++++++++++
>  xen/include/public/sysctl.h  |  23 ++
>  xen/include/xen/dt-overlay.h |  58 +++++
>  5 files changed, 516 insertions(+), 1 deletion(-)
>  create mode 100644 xen/common/dt-overlay.c
>  create mode 100644 xen/include/xen/dt-overlay.h

Is it possible that on the next patch I and other REST maintainers are Cc-ed
merely because at this point of introducing the two new files they're not
added to (perhaps) the DEVICE TREE section of ./MAINTAINERS right away?

Jan