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Control Iommu pre-boot Behavior; is it needed?

grumpy
in VM Engine (KVM)

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Or does it provide any benefits?

 

I have a ASUS Pro WS W680-ACE IPMI MB and in the bios is Control Iommu pre-boot Behavior right below the VT-d enabled. Now my understanding is they are the same, but hoping it adds more granularity in Unraid immou SATA controller: So I can pass through one hard-drive with out installing a pcie HBA/Sata controller.

 

The goal is to have one drive that is in a pool not the array as close as native to the Win 11 VM running Blue Iris NVR.

I guess that the other option maybe pcie_acs_override=multifunction as explained in @SpaceInvaderOne 7 year old video A little about Passthrough, PCIe, IOMMU Groups and breaking them up. I remember watching and doing this back then for something. Who would figure it is still viable today! 

Edited by grumpy
SP

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