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 Cc: devicetree@xxxxxxxxxxxxxxx Cc: robh+dt@xxxxxxxxxx Cc: mark.rutland@xxxxxxx Cc: xen-devel@xxxxxxxxxxxxx --- Changes in v5: -rename offset to xen,offset 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..d483a21 --- /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 + +- 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 -- 1.9.1
