Re: [Xen-devel] [PATCH v2] devicetree, xen: add xen, shared-memory binding

[Julien Grall <julien.grall@xxxxxxx>]

Hi Stefano,

On 18/10/2018 23:10, Stefano Stabellini 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>
> ---
> Changes in v2:
> - fix Author line
> - add versioning
> - xen,id instead of id
> ---
>   .../bindings/reserved-memory/xen,shared-memory.txt   | 20 ++++++++++++++++++++
>   1 file changed, 20 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..9078fb7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reserved-memory/xen,shared-memory.txt
> @@ -0,0 +1,20 @@
> +* 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", "xen,shared-memory"
Do we need to specify the two compatibles?

> +
> +- reg:
> +       the base guest physical address and size of the shared memory region
> +
> +- xen,id:
> +       a string that identifies the shared memory region as specified in
> +       the VM config file
--
Julien Grall

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