linux-kernel - Re: [Xen-devel] [PATCH 3/4] usb: Introduce Xen pvUSB backend

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Date:	Fri, 06 Mar 2015 07:52:23 -0500
From:	Austin S Hemmelgarn <ahferroin7@...il.com>
To:	Juergen Gross <jgross@...e.com>,
	David Vrabel <david.vrabel@...rix.com>,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
	linux-usb@...r.kernel.org, gregkh@...uxfoundation.org,
	cyliu@...e.com
Subject: Re: [Xen-devel] [PATCH 3/4] usb: Introduce Xen pvUSB backend

On 2015-03-04 09:09, Juergen Gross wrote:
> The main question whether it is worth to consider this alternative is
> the performance aspect. Does anyone have an idea which USB devices would
> typically be used via pvusb? I'd suspect memory sticks and USB disks
> and perhaps webcams being the most performance relevant ones. Is an
> additional copy operation of user data acceptable here?
>
Biggest use-cases I can think of for USB pass-through would be hardware 
'security' devices (fingerprint readers, Yubikeys, SafeNet dongles), 
webcams, and some of the more exotic input devices.  Webcams and input 
devices are probably the most significant performance-wise.
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