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

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Date:   Sun, 17 Apr 2022 20:24:07 +0300
From:   Oleksandr <olekstysh@...il.com>
To:     Stefano Stabellini <sstabellini@...nel.org>
Cc:     xen-devel@...ts.xenproject.org,
        virtualization@...ts.linux-foundation.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Julien Grall <julien@....org>, Juergen Gross <jgross@...e.com>,
        Christoph Hellwig <hch@...radead.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 3/6] dt-bindings: xen: Add xen,dev-domid property
 description for xen-virtio layer


On 16.04.22 01:01, Stefano Stabellini wrote:

Hello Stefano


> On Thu, 14 Apr 2022, Oleksandr Tyshchenko wrote:
>> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.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@...m.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 --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@...m.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.
> I don't think that this last statement is necessary or fully accurate, so
> I would remove it.


ok, will remove


> Other than that, this looks good to me.


thank you


>
>
>> +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"


ok, will change


>
>
>
>> +additionalProperties: true
>> +
>> +examples:
>> +  - |
>> +    virtio_block@...0 {
>> +            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
>>
-- 
Regards,

Oleksandr Tyshchenko