Re: [Xen-users] Difference between primary and secondary VGA pass through

["Daniel E. Shub" <daniel.shub@xxxxxxxxxxxxxxxx>]

On Thursday 01 May 2014 11:50:34 Gordan Bobic wrote:
> On 2014-05-01 11:34, Daniel E. Shub wrote:
> > I posted this question over at
> > http://unix.stackexchange.com/questions/123510/differences-between-primary
> > -and-secondary-vga-pass-through-in-virtualization but didn't get an answer
> > so I
> > thought I would try here ...
> > 
> > From the wiki I think I understand why passing a VGA adapter through is
> > more
> > difficult than passing a standard PCI device through and to some extent
> > why
> > passing a VGA adapter through as the primary device is more difficult
> > than
> > passing it through as a secondary device. What I m confused about is
> > what are
> > the advantages of passing a VGA adapter through as the primary device
> > as
> > opposed to the secondary device?
> 
> The only advantage of passing the interface as primary (and FWIW I have
> never actually seen this work) is that in that case you get to see the
> SeaBIOS POST screen and the domU OS boot progress before it loads the
> GPU
> driver. Other than that, I am not aware of any advantage.
> 
> Gordan
> 
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If that is true, it seems like people are doing a lot of work for not too many 
advantages. So much of the information on the web about VGA pass through is 
confusing at best and often just wrong.

Dan
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