[SOLVED] "AMD-Vi: IOMMU" error on boot

TheHellSite

Well-Known Member
Mar 4, 2020
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I am getting the error below on my new AMD system.

Code:
root@PVE:~# dmesg | grep -e DMAR -e IOMMU
[    0.842454] pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
[    0.844620] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[    6.755830] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>

Should I be worried about this?
What does this error mean in terms of using Proxmox?
Right now it seems like the system is working fine.
I already read about editing grub config, disabling IOMMU, ... but I am curious if that is even necessary.

Mainboard: ASUS ROG STRIX B550-F GAMING
In BIOS I have set the following....
Advanced ---> CPU ---> SVM Mode (CPU Virtualization) = Enabled
Advanced ---> AMD CBS ---> IOMMU = Auto
 
B550 motherboards should work fine. Please make sure that you set the necessary virtualization settings to Enabled. When using Auto, not everything is fully enabled, especially the IOMMU.