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 10:20:21 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Krzysztof Opasiak <k.opasiak@...sung.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Jeremy White <jwhite@...eweavers.com>,
	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 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.

	Regards
		Oliver


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