RE: [Xen-devel] X11 on domU

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> What we'd like to do is run several independant X11's on a 
> single CPU box. Using on-board (AGP) graphics, and additional
> (PCI) graphics cards, and various USB controllers for the 
> keyboard/mice combos.
> The aim is to have three 'consoles', each with a browser 
> running to provide access to our library catalogue. With Xen 
> we should be able to isolate each console in its own dom, 
> ensuring that one user can't so easily ruin others functionality.
> 
> I'm running Debian 3.1 sarge/stable as dom0.
> I've got Xen 3.0.2 stable sources and built them with to 
> include the pciback module. Using pciback I can happily have 
> various devices show up in domU (ethernet, USB controller and 
> graphics) with things like 'lspci'. The obvious stuff just 
> plain works - I can use the ethernet card instead of the 
> virtual ethernet, find USB devices.
> I 'upgraded' domU to debian unstable, to get a more recent 
> Xorg setup, but I still get stuck.
> 
> 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  --------------
> 
> At this point I'm out of ideas :)
> 
> Anyone have any pointers or ideas?

As well as mapping the linear framebuffer, this particular X driver
wants to map the VGA memory area at 0xa0000. 

As an experiment, trying hacking in a call to the following in
setupDevice in pciif.py: 

 xc.domain_iomem_permission(dom = fe_domid,
                    first_pfn = 0xA0000>>PAGE_SHIFT,
                    nr_pfns = 0x10000>>PAGE_SHIFT,
                    allow_access = True) 

You may also need to map the VGA BIOS, in which case use nr_pfns =
0x27FFF>>PAGE_SHIFT 

Please let me know if this works.

Best,
Ian


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