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

[Bronek Kozicki]

Some Linuxes do not boot on 440FX (at least, not for me with booting with UEFI, which is recommended for GPU passthrough).


B.


On Thu, 27 Dec 2018, at 8:18 PM, Brett Foster wrote:
> Why use q35? I always thought that wasn't recommended. At least a couple 
> years ago, that was my impression.
> 
> 
> Sent from my BlackBerry - the most secure mobile device
> 
>   Original Message  
> From: erratic at yourstruly.sx
> Sent: December 27, 2018 12:12 PM
> To: fosterb at edgeandvertex.org; brok at spamcop.net
> Cc: vfio-users at redhat.com
> Subject: Re: [vfio-users] Installing Catalyst prevents VM from booting.
> 
> 
> 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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