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

[Stefano Stabellini <sstabellini@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

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..a927a94
--- /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"
+
+- reg:
+       the base guest physical address and size of the shared memory region
+
+- id:
+       a string that identifies the shared memory region as specified in
+       the VM config file

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