linux-kernel - Re: [Xen-devel] [Patch V4 1/3] usb: Add Xen pvUSB protocol description

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Message-ID: <20150723212903.GA21789@reaktio.net>
Date:	Fri, 24 Jul 2015 00:29:03 +0300
From:	Pasi Kärkkäinen <pasik@....fi>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Juergen Gross <jgross@...e.com>, xen-devel@...ts.xensource.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	david.vrabel@...rix.com, boris.ostrovsky@...cle.com
Subject: Re: [Xen-devel] [Patch V4 1/3] usb: Add Xen pvUSB protocol
 description

On Thu, Jul 23, 2015 at 12:08:01PM -0700, Greg KH wrote:
> 
> Somewhere that people can refer to that describes this public-facing API
> that "must not ever be broken or changed".  If you want to put it in a
> documentation file, or a .h file, I don't care.
> 
> > >>It is used e.g. in SUSE's xen kernel since 2.6.18.
> > >
> > >I am very aware of the amount of Xen crap in SuSE's kernel, don't use
> > >that as an excuse for me to merge it to mainline :)
> > 
> > :-)
> > 
> > Wasn't meant as an excuse, just a hint why the interface can't be the
> > same as for usbip. We have to ensure compatibility with those kernels
> 
> This shouldn't be a kernel/kernel compability issue, as the api talks
> between Xen and the OS, not between different OSs, right?
> 
> > and possibly other operating systems (BSD?, Windows?) which already
> > might be using pvUSB with a Dom0 based on the SUSE xen kernel.
> 
> Are there other operating system drivers today that use this API?  Is
> this an API in the Xen core today that we have to support?
> 
> Some more background / descriptions would be nice to have.
>

For example Xen "GPLPV" drivers for Windows do have PVUSB frontend driver..


-- Pasi

 
> thanks,
> 
> greg k-h
> 
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