RE: [Xen-users] HVM questions

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: John Helder [mailto:gtg032i@xxxxxxxxxxxxxxx] 
> Sent: 11 July 2006 14:18
> To: Petersson, Mats; 'Gregory Gee'; xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] HVM questions
> 
> To Mats, Gregory, and Xen-Users:
> 
> 
> Does the below limitation also explain the current issues 
> with accessing
> pass-through video cards in domU via X as described in Julian 
> Davison's post
> "X11 in domU" (4 July 2006)?  

Only if you try to do it in HVM domain - which you can't do anyways, as
you can't pass the PCI (AGP/PCIe are PCI in this case) to the DomU in
HVM-mode. 

It's probably broken in some other way... 

--
Mats
> 
> 
> Petersson's E-mail:
> >Yes, PCI passthrough is currently only supported for 
> Para-virtual guests. 
> >It is expected to be solved (there's no technical limitation 
> for this, just
> 
> >that someone has to write some code to support it, basically 
> - and the  
> >principle is not difficult - just fill in the PCI-table in 
> the guest so
> that 
> >the device looks like its there). There are some other 
> limitations tho'. If
> 
> >the PCI-card uses direct memory access, you'd need to use a 
> para-virtual 
> >driver (i.e a driver that is aware of the fact that physical 
> memory isn't 
> >where the guest-OS thinks it is). 
> 
> >PIO-type card will work fine without special drivers - 
> unfortunately, 
> >very few PCI-cards are PIO-based... 
> 
> 
> 
> Davison's E-mail:
> >Using "X -novtswitch -sharevts vt1" I ended up being told:
> >
> >-------------- copy of end of X output starts --------------
> >(EE) I810(0): Cannot map SYS BIOS
> >
> >Fatal server error:
> >xf86MapVidMem: Could not mmap framebuffer (0x000a0000,0x10000) (Bad
> address)
> >--------------  copy of end of X output ends  --------------
> 
> 
> Thank-you.
> 
> John Helder
> gtg032i@xxxxxxxxxxxxxxx
> 
> 
> 



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