Intel Xeon Gold iommu/ACS support on Proxmox5.0

[Spiros Pap]

Hi all,

I would like to ask if Proxmox 5.0 supports IOMMU/ACS for passthrough ethernet adapters (intel XL710) when the hardware is a new Dell R740 with Xeon Gold 6126 (of course, I don't have the HW yet or I would try myself).

The new Xeon Gold family does not state VT-d support or ACS support and while VT-d/ACS seems to be a chipset feature, it is not clear if I would be able to passthrough my adapters to VMs.

So, does anyone knows about this?

Thank you,
Spiros

PS: Why Proxmox 5 does not enable iommu, when it is available? It seems to be an important feature and I guess there is no harm in enabling it.

 

[wolfgang]

Hi,

I don't know about the intel Gold, but qemu patches are very new for Skylake-server CPU so I think it will need anyway time until this CPU is fully supported.

PS: Why Proxmox 5 does not enable iommu, when it is available? It seems to be an important feature and I guess there is no harm in enabling it.

Because when it is not proper implemented (IOMMU in bios) it will make the system unstable.