Re: [Xen-devel] [PATCH v4] devicetree, xen: add xen, shared-memory binding

[Rob Herring <robh+dt@xxxxxxxxxx>]

Missing the DT list...

On Mon, Dec 3, 2018 at 3:43 PM Stefano Stabellini
<sstabellini@xxxxxxxxxx> wrote:
>
> From: Stefano Stabellini <stefanos@xxxxxxxxxx>
>
> Introduce a device tree binding for Xen reserved-memory regions. They
> are used to share memory across VMs from the VM config files. (See
> static_shm config option.)
>
> Signed-off-by: Stefano Stabellini <stefanos@xxxxxxxxxx>
> Cc: julien.grall@xxxxxxx
> ---
> Changes in v4:
> - add offset property
>
> Changes in v3:
> - remove fallback version
>
> Changes in v2:
> - fix Author line
> - add versioning
> - xen,id instead of id
> ---
>  .../bindings/reserved-memory/xen,shared-memory.txt | 24 
> ++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>  create mode 100644 
> Documentation/devicetree/bindings/reserved-memory/xen,shared-memory.txt
>
> diff --git 
> a/Documentation/devicetree/bindings/reserved-memory/xen,shared-memory.txt 
> b/Documentation/devicetree/bindings/reserved-memory/xen,shared-memory.txt
> new file mode 100644
> index 0000000..0a35ffc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reserved-memory/xen,shared-memory.txt
> @@ -0,0 +1,24 @@
> +* Xen hypervisor reserved-memory binding
> +
> +Expose one or more memory regions as reserved-memory to the guest
> +virtual machine. Typically, a region is configured at VM creation time
> +to be a shared memory area across multiple virtual machines for
> +communication among them.
> +
> +For each of these pre-shared memory regions, a range is exposed under
> +the /reserved-memory node as a child node. Each range sub-node is named
> +xen-shmem@<address> and has the following properties:
> +
> +- compatible:
> +       compatible = "xen,shared-memory-v1"
> +
> +- reg:
> +       the base guest physical address and size of the shared memory region
> +
> +- offset: (borrower VMs only)
> +       64 bit integer offset within the owner virtual machine's shared
> +       memory region used for the mapping in the borrower VM.

xen,offset. 'offset' is already used in some other bindings to mean
register bit offset.

> +
> +- xen,id:
> +       a string that identifies the shared memory region as specified in
> +       the VM config file
> --
> 1.9.1
>

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