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

[Gordan Bobic <gordan@xxxxxxxxxx>]

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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