December 27, 2019 11:37 AM, "John Mitchell" <[email protected]> wrote:

> "This can especially be the case with consumer class machines such as Ryzen."
> I had to lol about this since I have had many Intel systems with one problem 
> or another and this is
> certainly not isolated to Ryzen. I am also running a Ryzen system running 
> three VMs with
> PCI-passthrough on one of the VMs with no problems. I do not know if my 
> motherboard is consumer
> grade (ASrock) however it does rock. ;)
> 

It's not passthru in general, it's passthru of specific devices, in this case 
USB controllers. My network devices passthru just fine because they're in their 
own groups. Since you said "PCI-passthrough on one of the VMs" I'm assuming 
you're talking about sys-net, and that you're not using a USB Qube (which would 
make it two VMs). And just because passthru doesn't work on one (Intel) system 
or another doesn't necessarily mean it's because of IOMMU grouping. There are 
plenty of different reasons it could break. 

In any case, yeah, I'm sure Intel systems have their problems too. I just 
happened to come across a lot of complaints about IOMMU grouping on AMD, 
especially Ryzen. But my main point was about Xen and Qubes with regards to 
IOMMU grouping. The AMD-vs-Intel matter is the least of my concerns.

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