Re: [Xen-devel] Re: Install paravirtualized drivers after bootingforhigh-performance IO

["miaofeng" <miaofeng@xxxxxxxxxxxxxxxx>]

Thanx alot, Mark.

I am wondering if device management, like vga, would share the same 
architecture as block device?
if that is the case, would vga be accessed by guest os directly?
if that is not the case, shall we have to base it on X11 system?

if all above is wrong, will u please give me some outline of the device 
achitecture?

Miao

StarSoftComm.com


----- Original Message ----- 
From: "Mark Williamson" <mark.williamson@xxxxxxxxxxxx>
To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
Cc: "Miao Feng" <miaofeng@xxxxxxxxxxxxxxxx>
Sent: Friday, May 13, 2005 11:33 PM
Subject: Re: [Xen-devel] Re: Re: Install paravirtualized drivers after 
bootingforhigh-performance IO


>     As i recognized, paravirtulization is an implemention of high
> performence virtulization in non-VT box, pure virtulization needs no
> modification on guest os, but paravirtulization do needs. Is that right?

Yes, that's all correct.

>     If so, guest os on VT cpu will provide no paravirtulization?

A fully virtualised environment will be available for guests on a VT CPU, so 
they won't *need* any modifications in order to run.  However, for good IO 
performance, you're likely to want to install Xen-aware device drivers which 
will be compatible with the existing frontend/backend scheme.

Other fully virtualised environments (e.g. VMWare) also sometimes provide 
higher-performance drivers that are aware of the environment.  In Xen's case 
we have Xen-aware drivers already but they need to be adapted to run in a VT 
virtual machine

HTH,
Mark

>     Any suggestions?
>
> Miao
> StarSoftComm.com
>

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