On 05/15/2017 12:58 AM, Ian Zimmerman wrote:
The 990FX / 790FX Chipset doesn't have a GART / AGP Aperature or IOMMU
in it. The CPU contains the original K8 IOMMU ( v1 ) engineered /
converted from a GART.
The 8 and 9 series (not 7) does have an IOMMU, AMD-Vi v1.26.
I have two 890 series (but the server flavor - SR5690 chipset) boards
with an IOMMU and it works great, I play games in a VM with an attached
graphics card on my libre firmware KGPE-D16 and devices are DMA restricted.
Most consumer boards don't properly implement this feature, in fact I
have never seen one that did which is why I bought my coreboot (libre
init variant) D16.
It wouldn't be that difficult to port coreboot to your board if you want
this to work FYI.
