[vfio-users] Emulated VGA and real card running in parallel

[Alex Williamson]

On Wed, Sep 16, 2015 at 5:05 PM, Blank Field <ihatethisfield at gmail.com>
wrote:

> Ahh, i can't give you an exact link, but at the 2014 KVM forum talk you've
> mentioned something called secondary pass through. What is it then?
>

That's what we're talking about, emulated VGA + assigned GPU, the assigned
GPU is the secondary graphics for the VM, but depending on guest OS support
may become the primary/exclusive.  This is how Nvidia Quadro support
actually works.  With that it somehow even works with Seabios, I assume
because the Nvidia driver effectively opts-out of VGA arbitration like we
have in Linux.  I know that AMD cards can often be assigned this way, but I
guess I'm not sure if they can be used concurrently.  I'm pretty sure it
works with GeForce.  Seems to be entirely dependent on guest OS and driver
support.
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