Arch Linux

kikaduka

Member

Registered: 2016-02-25

Posts: 1

Issue enabling VT-D

Hello

I would like to setup a GPU passthrough.
My hardware is
   - i7 4770 CPU (IGP to be used for host)
   - z87 ud4h
   - AMD 390 GPU to be passed through

I have read and followed different guides but they all seem to fail:

> dmesg|grep -e DMAR -e IOMMU
...
[    0.293119] DMAR: Intel(R) Virtualization Technology for Directed I/O
[    1.499968] AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
[    1.499969] AMD IOMMUv2 functionality not available on this system
[    4.237009] [drm] DMAR active, disabling use of stolen memory
...

I think I have found another issue:

 
> lscpu
....
BogoMIPS:              6786.88
Virtualization:        VT-x
L1d cache:             32K
...

I would expect to see VT-d or something like it instead of VT-x.

The CPU is VT-d compatible and VT-d is enabled in the BIOS and grub has been configured with intel_iommu=on.
I have also installed linux-vfio-lts from AUR.

Any idea how I could fix this?

Thanks