CPU Support
An absence of critical technical documentation has historically slowed growth and adoption of developer ecosystems for GPU virtualization.
This CC-BY-4.0 licensed content can either be used with attribution, or used as inspiration for new documentation, created by GPU vendors for public commercial distribution as developer documentation.
Where possible, this documentation will clearly label dates and versions of observed-but-not-guaranteed behaviour vs. vendor-documented stable interfaces/behaviour with guarantees of forward or backward compatibility.
Historical page. This page documents an earlier project or architecture (the OpenMdev / LibVF.IO era, 2021–2023). It is retained for reference and is not part of the current Open-IOV stack. Current documentation starts at Documentation.
In order to use mediated device functionality you may need to set some or all of the following settings in your machine's UEFI.
UEFI Setup
Intel CPUs (VT-d)
Optimal UEFI Settings
IOMMU >> Enabled
SR-IOV Support >> Enabled
VT-x >> Enabled
ARI Mode >> Enabled
AMD CPUs (AMD-v)
Optimal UEFI Settings
SVM Mode >> Enabled
SR-IOV Support >> Enabled
ACS Enable >> Enabled
IOMMU >> Enabled
PCI AER Support >> Enabled
ACS Enable >> Enabled
ARI Mode >> Enabled
Note to AMD CPU users: If you are using a first generation Ryzen or ThreadRipper platform you may need to update your motherboard UEFI to make proper use of IOMMU Groups. If your motherboard manufacturer has not made an update available you may need to apply an ACS override patch. Successive AMD CPU platforms are unaffected.