[vfio-users] Installing Catalyst prevents VM from booting.

[Paige Thompson]

Interesting fact about pcie and pci buses is that underneath the surface they speak the same language. This in parts lends i440fx the ability to work with pass through pcie devices. I dont think its as simple as that, so you will have to check to be sure.

 Pcie brings more to the table in addition including ways to scale up the number of devices connected to a topology. The kvm / qemu gets significantly more complicated and hard to follow as well. Im working on a visualization tool to make following a libvirt domxml configuration easier as of late. Mostly because I need some python practice but i cant imagine that the configuration is going to get any better than it is and i think potentially useful. My biggest concern with recommending q35 would just be that i wouldn't want to randomize somebody who doesn’t have the time and patience to put it together and make it work. I have some links and I've been considering putting together a wiki for this, but it always helps to have some time and a back up computer if necessary. It’s worth taking the time to understand a few things which may not be an over and done project for everybody in the audience. 

Anyway Ive also moved onto another issue, ive managed to get latency issues worked out well enough, and ive been experimenting with nested virtualization. esxi in particular (what a nightmare)

Sent from my iPhone

> On Dec 28, 2018, at 2:51 PM, Brett Foster <fosterb at edgeandvertex.org> wrote:
> 
> Well... that's um... friendly and welcoming piece of feedback.
> 
> Surprisingly, I find this technology surprisingly good which is a surprisingly good testimonial. Don't mind read interpretation. It is a testament.
> 
> Anyhow, my apologies for offending Kash's sensibilities.
> 
> Brett
> 
> Sent from my BlackBerry - the most secure mobile device
> 
>   Original Message  
> From: kash at tripleback.net
> Sent: December 28, 2018 1:33 PM
> To: vfio-users at redhat.com
> Subject: Re: [vfio-users] Installing Catalyst prevents VM from booting.
> 
> Your anecdotal evidence is meaningless, please, don't encourage others
> to use obsolete machine types. Plenty have profiled it and even the
> developers tell you that Q35 is the way to go. "Surprisingly stable" is
> not a sound endorsement of i440fx. If you couldn't make an AMD GPU work,
> that's probably because you didn't create a valid PCIe heirarchy.
> 
> 
> Kash
> 
>> On 2018-12-28 1:16 p.m., Brett Foster wrote:
>> I have no issues using PCIe devices or recent-ish processors. Maybe I'm missing out on something, but performance is good, stable. Surprisingly stable. Can't speak for hot swapping and more fancy configurations, though.
>> 
>> But most of all, couldn't get AMD cards to work with Q35... so the choice was easy. ;)
> 
> 
> 
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