RE: [Xen-users] HVM questions

["John Helder" <gtg032i@xxxxxxxxxxxxxxx>]

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)?  


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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