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Re: [Xen-devel] [PATCH 4/6] libxl: add basic support for devices without backend

On Thu, Sep 08, 2016 at 09:20:24AM +0200, Juergen Gross wrote:
> With the planned support of HVM USB passthrough via the USB emulation
> capabilities of qemu libxl has to support guest devices which have no
> back- and frontend. Information about those devices will live in the
> libxl part of Xenstore only.
> Add some basic support to libxl to be able to cope with this scenario.
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Code-wise, this patch looks good:

Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>

>          /*
>           * We make a copy of everything for the backend in the libxl
> @@ -194,6 +205,9 @@ retry_transaction:
>           * instead.  But there are still places in libxl that try to
>           * reconstruct a config from xenstore.
>           *
> +         * For devices without backend (e.g. USB devices emulated via qemu)
> +         * only the libxl path is written.
> +         *

Without PV backend.

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