linux-kernel - Re: [Spice-devel] [RFC PATCH 1/1] Add a usbredir kernel module to remotely connect USB devices over IP.

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Date:	Mon, 06 Jul 2015 15:14:54 -0500
From:	Jeremy White <jwhite@...eweavers.com>
To:	Oliver Neukum <oneukum@...e.com>,
	Krzysztof Opasiak <k.opasiak@...sung.com>
CC:	Alan Stern <stern@...land.harvard.edu>,
	Hans de Goede <hdegoede@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	spice-devel@...ts.freedesktop.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Spice-devel] [RFC PATCH 1/1] Add a usbredir kernel module to
 remotely connect USB devices over IP.

On 07/06/2015 03:20 AM, Oliver Neukum wrote:
> On Fri, 2015-07-03 at 10:51 +0200, Krzysztof Opasiak wrote:
>> Doesn't we have the same problem with functionfs/gadgetfs and
>> dummy_hcd? 
>> Or with fuse?
>>
>> It's a very generic problem for all "virtualized devices" and it is 
>> known for quite a long time. This is why many tutorials about swap
>> warns 
>> that swap should be set up only on real block devices which are fully 
>> served in kernel.
> 
> Indeed. But the point is that it isn't limited to swap. As you as
> a page needs to be laundered the problem exists.
> Mmapping a file for write (non private) is enough.

I'm persuaded to avoid user space in the core design.

Anything else fundamental to usbip that should inform the design of a
usbredir driver?  usbip appears to be based off a 2004 vintage of
dummy_hcd.  I'll look thoughtfully at the current dummy_hcd; please let
me know if there is anything else I should consider.

Cheers,

Jeremy
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