From 27b4feb7fe373e1ed92b9362b1e33cead271ac84 Mon Sep 17 00:00:00 2001 From: Stefano Stabellini Date: Mon, 3 Dec 2018 14:26:09 -0800 Subject: [PATCH] devicetree,xen: add xen,shared-memory binding 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 Cc: julien.grall@arm.com Cc: devicetree@vger.kernel.org Cc: robh+dt@kernel.org Cc: mark.rutland@arm.com Cc: xen-devel@lists.xen.org Signed-off-by: Rob Herring --- .../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 000000000000..d483a2103d70 --- /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@
and has the following properties: + +- compatible: + compatible = "xen,shared-memory-v1" + +- reg: + the base guest physical address and size of the shared memory region + +- xen,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 -- 2.30.2