Em segunda-feira, 1 de outubro de 2018 16:04:34 UTC-3, naas...@gmail.com  
> Installation went fine except for a libxenlight config error of some kind. I 
> still can't enable IOMMU using either of the approaches described in that 
> Ubuntu thread, even though it successfully worked with raw Linux.
> What boot parameters did you add? I have the earlier rev.1 Sabertooth 990FX 
> mobo that you have.

My mobo is rev.2, firmware 2901
I used (ivrs_ioapic[7]=00:14.0 ivrs_ioapic[8]=00:00.2). I am not using anymore 
and my qubes 4.0 is working fine.

But ubuntu forum has a solved solution with different ioapic:
Quick solution for Sabertooth 990FX (R1.0):
Edit file /etc/default/grub, find line "GRUB_CMDLINE_LINUX_DEFAULT=", edit it 
to look like:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash ivrs_ioapic[7]=00:14.0 

There are iommu info here too:
from Xen https://wiki.xen.org/wiki/VTd_HowTo

If you can not solve the iommu problem, change all vms to PV. Maybe this is the 
cause of libxenlight error. Change all vms to PV, including sys-net.
Later I will send you the commands to start networking.

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