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

[Paige Thompson]

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-bounces at redhat.com <vfio-users-bounces at redhat.com> on behalf of Brett Foster <fosterb at 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 <brok at spamcop.net<mailto:brok at 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
  brok at spamcop.net<mailto:brok at spamcop.net>

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