What is the best way to enable the Intel VT-d extensions for IOMMU? qubes-hcl-report is showing IOMMU is not active.
SeaBIOS is only showing three options: boot from disk, memtest, and coreinfo.
Coreinfo seems to be corrupted? Just shows wide green and black lines, no info.
If I understand correctly, coreboot has no UI for doing any config; config must be done when you install/flash it. If you want a runtime config UI you need to install coreboot with the nvramcui payload, however it is not clear whether nvramcui will allow to change VT-d/IOMMU settings.
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So, a failed attempt. Rather than reinstalling with nvramcui, I tried using the nvramtool utility from userspace Linux. (From package coreboot-utils on Fedora. Maybe nvramtool on Debian.)
Installing on Qubus dom0: sudo qubes-dom0-update coreboot-utils
However, when running sudo nvramtool -a, it says “coreboot table not found. coreboot does not appear to be installed on this system. …”
So that didn’t work. Not sure whether flashing a new coreboot with nvramcui would give different results. Maybe Xen is somehow preventing dom0 from accessing the nvram flash?
So, that was a fail. Some interesting info here which I haven’t yet fully parsed through and tried to act on: