From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754723AbbCFMwg (ORCPT ); Fri, 6 Mar 2015 07:52:36 -0500 Received: from mail-ig0-f182.google.com ([209.85.213.182]:37387 "EHLO mail-ig0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751430AbbCFMwd (ORCPT ); Fri, 6 Mar 2015 07:52:33 -0500 Message-ID: <54F9A307.1080708@gmail.com> Date: Fri, 06 Mar 2015 07:52:23 -0500 From: Austin S Hemmelgarn User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Juergen Gross , David Vrabel , linux-kernel@vger.kernel.org, xen-devel@lists.xensource.com, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, linux-usb@vger.kernel.org, gregkh@linuxfoundation.org, cyliu@suse.com Subject: Re: [Xen-devel] [PATCH 3/4] usb: Introduce Xen pvUSB backend References: <1424957717-392-1-git-send-email-jgross@suse.com> <1424957717-392-4-git-send-email-jgross@suse.com> <54F44BD5.1030008@citrix.com> <54F7091C.1050001@suse.com> <54F70E3D.20201@citrix.com> <54F71221.6050800@suse.com> In-Reply-To: <54F71221.6050800@suse.com> x-hashcash: 1:21:150306:jgross@suse.com::f4ebdffb52978f4a6c093375950f0dd9:39b78676a4a4a64f x-hashcash: 1:21:150306:david.vrabel@citrix.com::cd192ebcb39e554a725617e87df763df:6d72129321672012 x-hashcash: 1:21:150306:linux-kernel@vger.kernel.org::6af32a3feff634b7a3aca9ae7c9577c2:d9cb1ea4cc0f6d21 x-hashcash: 1:21:150306:xen-devel@lists.xensource.com::7bc124b45a1b827db66244b9f3a85645:94aab1d46efd3e58 x-hashcash: 1:21:150306:konrad.wilk@oracle.com::64d01212239808277c3a1f521331bc28:8f650b68537002b4 x-hashcash: 1:21:150306:boris.ostrovsky@oracle.com::d859eecb856f2da09f092424aca3790e:5433b3d4415c737 x-hashcash: 1:21:150306:linux-usb@vger.kernel.org::580f58645ba82b9242361af17a4a6156:1c36292ea8c4c2f1 x-hashcash: 1:21:150306:gregkh@linuxfoundation.org::e6635c355ba4b03a247bb065328fe436:b09b80a8d54abc84 x-hashcash: 1:21:150306:cyliu@suse.com::19b770f25911e67bb2318c277536cc26:b321631e526f0633 x-stampprotocols: hashcash:1:17;mbound:0:10:3000:5000 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.