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

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

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


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