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

[Rob Herring <robh@xxxxxxxxxx>]

On Mon, Oct 22, 2018 at 11:27:23AM +0100, Julien Grall wrote:
> 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?

I'd just drop the fallback as version seems to be just in case.

Rob

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