Re: [Xen-users] usb_add to windows guest

[Daniel Gomes <dgomes@xxxxxxxxxxxxxxx>]

 Hey James,

first of all, thanks for the really fast reply!

Regarding what you said, it was really too much for me hehe. I mean, I 
admin a Xen server and regularly add/delete Linux guests, but it's my 
first time with a Windows guest (and with USB) and, to be honest, I 
didn't even know what qemu was until I wiki'ed it right now lol.
That being said, could you please explain what you mean by "pass through 
the block device"? You mean smth like /dev/sdg? That obviously can't go 
in the "usb_add" command, so where shall I use that? Sorry for the 
ignorance...
Basically all I want is that the drive gets plugged in at some specific 
point (it can even be manually). I'm trying to make a "Windows Complete 
PC Restore" and according to some posts I read (after it failing a 
couple of times), it only works if the USB stick containing the backup 
image is inserted after the recovery program is started (go figure 
Windows out...). That is all I want (a one time thing), so any solution 
(no matter how "manual") would be great.
Thanks again,

On 10/13/2010 01:25 PM, James Harper wrote:
> >    Dear all,
> >
> > I have been trying to connect a usb external disk to a Windows Server
> > 2008 guest through Xen 3.2.
> The current qemu based USB passthrough is USB 1.1, which is really bad
> for performance, and also completely doesn't work with some disk
> devices, although I'm not sure how the mapping between qemu usb 1.1 and
> a physical usb 2.0 port comes into that.
>
> Can you instead pass through the block device? With a bit of creative
> udev scripting you could make the block device add and remove
> automatically from the domu every time you plug it into the physical
> machine.
>
> I starting writing USB passthrough for my GPLPV drivers for Windows, and
> while I got it working for some USB storage devices it's still full of
> bugs and has probably suffered some bitrot since I last looked at it.
>
> James
>
>
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--
Daniel Gomes (SysAdmin)
dgomes@xxxxxxxxxxxxxxx
Ext. 3487 - 218419487

Instituto de Plasmas e Fusão Nuclear
Instituto Superior Técnico - UTL
Av. Rovisco Pais - 1049-001 Lisboa - Portugal


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