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xen-devel
[Xen-devel] Re: Xen VGA graphics passthrough for secondary adapters, vB
Pasi Kärkkäinen wrote:
Hello,
Now that Xen 4.0.0 is out and has support for primary graphics passthru
and many people have been using it already and asking for a status update
for secondary adapter passthru I thought of opening a new thread about this.
What are the actual issues that need to be resolved to get the
secondary graphics passthru working? Probably related to VGA BIOS execution
in the guest?
I think of two things need to be solved for secondary gfx assigned:
1) claim VGA cycle for it to display in VGA for guest, VGA is owned by
primary gfx.
2) load VGA bios from file, because you cannot get it from memory like
primary gfx.
How about the vBAR=pBAR stuff required for some (Nvidia) cards?
How do we get that functionality integrated so people don't need additional patches?
vBAR=pBAR patch is a bit tricky. It needs to cook a new clean vBAR=pBAR
patch if integrate it in upstream.
Was there also a problem that a working VGA BIOS cannot be copied from some cards
and they need to use/load it from a file?
Load it from a file should work for all cards, but it's not user
friendly (involving manual steps). It's better to implement a generic
approach to get VGA bios for various gfx cards including primary and
secondary gfx. The direct way is to load it from expansion rom, but it
doesn't always work because expansion rom address may be invalid (the
bridge may doesn't have enough memory for gfx card).
Regards,
Weidong
Thanks!
-- Pasi
btw. I've created a wiki page where we can list all the tested/working graphics
adapters:
http://wiki.xensource.com/xenwiki/XenVGAPassthroughTestedAdapters
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