Re: [RFC PATCH] virtio-usb: Add initial virtio-usb specification

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Message-ID: <[email protected]>
Date: Sat, 13 Jun 2026 11:42:03 -0400
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User-Agent: Mozilla Thunderbird
Subject: Re: [RFC PATCH] virtio-usb: Add initial virtio-usb specification
To: Vasilii Ianikeev <[email protected]>,
 [email protected]
Cc: [email protected]
References: <[email protected]>
Content-Language: en-US
From: Demi Marie Obenour <[email protected]>
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In-Reply-To: <[email protected]>

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On 6/11/26 09:08, Vasilii Ianikeev wrote:
> This patch introduces the draft virtio-usb device specification, which
> defines a dual-role USB device capable of operating as a USB host
> controller, USB device controller, or both roles with dynamic role
> switching support.
>=20
> A USB device may support one or more ports. Each port can operate as a
> USB host controller port, USB device controller port, or a dual-role
> port that allows role switching, depending on the device=E2=80=99s capa=
bilities.
>=20
>=20
> The specification includes:
>=20
> - Device ID assignment (49) (already reserved) and feature bits for
>   host, device, and role switching capabilities
> - Dedicated virtqueue sets for USB host role, USB device role, and OTG
>   role switching operations
> - Data transfer support for all USB endpoint types (control, interrupt,=

>   bulk, and isochronous)
> - USB host role operations including device connection/disconnection
>   events, URB submission, and bulk stream management
> - USB device role operations including endpoint management, gadget
>   lifecycle events, and control request handling
> - USB OTG support for dynamic role switching between host and device
>   modes
> - Multi-port support allowing devices to expose multiple USB ports with=

>   independent role configurations
>=20
> The specification refers to USB 2.0 and USB 3.2 specifications for
> common terms.
>=20
> For this device, there is a prototypical Linux kernel driver for which
> upstreaming is planned, and a proprietary device implementation.

Would it be possible to have a device implementation in QEMU, crosvm,
or another open source project?  If the only implementation is
proprietary, the driver will be of limited value to the community.
--=20
Sincerely,
Demi Marie Obenour (she/her/hers)
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Content-Description: OpenPGP digital signature
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