BTW I think the specific reason you want to separate your pcie endpoints on q35 
from the root complex using a switch or up/downstream ports is due to the fact 
that the root complex has direct access to memory. I can't find anything more 
specific regarding why that might be problematic but I know that pcie 
addressing is different for devices downstream as opposed to being connected 
directly to the root complex. I arrived at the conclusion that the amd driver 
works now with q35 because changed the topology as per the advice I read 
somewhere regarding how it should be done. I'd like to know for sure but I 
don't really understand PCIe well enough and I think as far as the driver is 
concerned its up to a guess as to why one configuration works and the other 
doesn't (unless you have better luck getting the windows remote kernel 
debugging to work than I have.)
________________________________________
From: vfio-users-boun...@redhat.com <vfio-users-boun...@redhat.com> on behalf 
of Brett Foster <fost...@edgeandvertex.org>
Sent: Wednesday, December 26, 2018 11:24:48 AM
To: Bronek Kozicki
Cc: vfio-users
Subject: Re: [vfio-users] Installing Catalyst prevents VM from booting.

I have been using AMD via i440fx for like 5 years or so (across different 
hardware and graphics cards). The drivers that work are the ones that come via 
Windows Update. The drivers distributed by AMD do not. Not sure why since 
presumably they come from the same place. lol.

On Tue, Dec 25, 2018 at 9:51 AM Bronek Kozicki 
<b...@spamcop.net<mailto:b...@spamcop.net>> wrote:
On Tue, 25 Dec 2018, at 4:21 PM, Paige Thompson wrote:
> Hey,
>
> From what I understand in general connecting devices straight to the
> root complex is problematic and they should be connected to a bridge. I
> was kind of wondering if anybody had any knowledge of this. I find the
> configuration really confusing. I still cant really tell how the
> topology works.


Hope Alex will shed some light on it when he's back from the holiday break.


--
  Bronek Kozicki
  b...@spamcop.net<mailto:b...@spamcop.net>

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