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Re: [XEN][PATCH v5 13/17] xen/arm: Implement device tree node removal functionalities
- To: Vikram Garhwal <vikram.garhwal@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 17 Apr 2023 10:08:28 +0200
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- Cc: sstabellini@xxxxxxxxxx, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 17 Apr 2023 08:09:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.04.2023 21:16, 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 | 415 +++++++++++++++++++++++++++++++++++
> xen/include/public/sysctl.h | 24 ++
> xen/include/xen/dt_overlay.h | 59 +++++
> 5 files changed, 514 insertions(+), 1 deletion(-)
> create mode 100644 xen/common/dt_overlay.c
> create mode 100644 xen/include/xen/dt_overlay.h
Can new files please use dashes in preference to underscores in their names?
Jan
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