IOMMU - Was working, now is disabled?

[skot4th]

I previously had my machine running, with my AMD Vega 64 passed through.  As I was having issues with one stick of my 16GB RAM I removed it, leaving me with now only 1 x 8GB.

 

I have tried to set up a new VM (after deleting the old one) but cannot pass through my Vega 64 GPU - it doesn't even show up in the list for available GPU's.  When I check System Information on Unraid I see the below, however in my machines BIOS VT-x is enabled.

 

Any idea how to fix this?  Do I need duel RAM?

 

Quote

Model: Custom

M/B: ASUSTeK COMPUTER INC. PRIME Z270-K Version Rev X.0x - s/n: 170808501500184

BIOS: American Megatrends Inc. Version 0809. Dated: 07/07/2017

CPU: Intel® Core™ i7-7700K CPU @ 4.20GHz

HVM: Enabled

IOMMU: Disabled

Cache: 256 KiB, 1 MB, 8 MB

Memory: 8 GiB DDR4 (max. installable capacity 64 GiB)

Network: eth0: 1000 Mbps, full duplex, mtu 1500
 eth1: 1000 Mbps, full duplex, mtu 1500

Kernel: Linux 5.10.28-Unraid x86_64

OpenSSL: 1.1.1j

Uptime: 0 days, 00:07:17

 

Thanks

home-diagnostics-20210523-1408.zip

[Squid]

22 minutes ago, skot4th said:

however in my machines BIOS VT-x is enabled

You need VT-d / IOMMU enabled.  Usually its buried in a submenu of the BIOS.  It's different than VT-x

[skot4th]

Any idea where to find it?  I followed these instructions on Asus.com to enable virtualisation.  Didn't mention any other options https://www.asus.com/support/FAQ/1043786/

[SimonF]

Normally in the system agent section.

 

Examples here https://us.informatiweb.net/tutorials/it/bios/enable-iommu-or-vt-d-in-your-bios.html

[skot4th]

Thanks, that worked!