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author | Stefano Stabellini <stefanos@xilinx.com> | 2018-12-04 01:26:09 +0300 |
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committer | Rob Herring <robh@kernel.org> | 2018-12-11 00:35:51 +0300 |
commit | 27b4feb7fe373e1ed92b9362b1e33cead271ac84 (patch) | |
tree | bd1bc42c76e11be02b0860b120c860f4e0ff2e6a /Documentation/devicetree/bindings/reserved-memory | |
parent | b3e46d1a0590500335f0b95e669ad6d84b12b03a (diff) | |
download | linux-27b4feb7fe373e1ed92b9362b1e33cead271ac84.tar.xz |
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 <stefanos@xilinx.com>
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 <robh@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/reserved-memory')
-rw-r--r-- | Documentation/devicetree/bindings/reserved-memory/xen,shared-memory.txt | 24 |
1 files changed, 24 insertions, 0 deletions
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@<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 |