diff mbox series

[RFC,3/6] dt-bindings: xen: Add xen, dev-domid property description for xen-virtio layer

Message ID 1649963973-22879-4-git-send-email-olekstysh@gmail.com (mailing list archive)
State New, archived
Headers show
Series virtio: Solution to restrict memory access under Xen using xen-virtio DMA ops layer | expand

Commit Message

Oleksandr Tyshchenko April 14, 2022, 7:19 p.m. UTC 
From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>

Introduce Xen specific binding for the virtio-mmio device to be used
by Xen virtio support driver in a subsequent commit.

This binding specifies the ID of Xen domain where the corresponding
device (backend) resides. This is needed for the option to restrict
memory access using Xen grant mappings to work.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
---
 .../devicetree/bindings/virtio/xen,dev-domid.yaml  | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/virtio/xen,dev-domid.yaml
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/virtio/xen,dev-domid.yaml b/Documentation/devicetree/bindings/virtio/xen,dev-domid.yaml
new file mode 100644
index 00000000..78be993
--- /dev/null
+++ b/Documentation/devicetree/bindings/virtio/xen,dev-domid.yaml
@@ -0,0 +1,39 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/virtio/xen,dev-domid.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xen specific binding for the virtio device
+
+maintainers:
+  - Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
+
+select: true
+
+description:
+  This binding specifies the ID of Xen domain where the corresponding device
+  (backend) resides. This is needed for the option to restrict memory access
+  using Xen grant mappings to work.
+
+  Note that current and generic "iommus" bindings are mutually exclusive, since
+  the restricted memory access model on Xen behaves as a kind of software IOMMU.
+
+properties:
+  xen,dev-domid:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Should contain the ID of device's domain.
+
+additionalProperties: true
+
+examples:
+  - |
+    virtio_block@3000 {
+            compatible = "virtio,mmio";
+            reg = <0x3000 0x100>;
+            interrupts = <41>;
+
+            /* The device is located in Xen domain with ID 1 */
+            xen,dev-domid = <1>;
+    };