On Thu, 14 Apr 2022, Oleksandr Tyshchenko wrote: > From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> > > 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@xxxxxxxx> > --- > .../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 --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@xxxxxxxx> > + > +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. I don't think that this last statement is necessary or fully accurate, so I would remove it. Other than that, this looks good to me. > +properties: > + xen,dev-domid: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: > + Should contain the ID of device's domain. Maybe better as: "The domid (domain ID) of the domain where the device (backend) is running" > +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>; > + }; > -- > 2.7.4 >
