VFIO Q: What is "Intel Corporation Cannon Lake PCH Shared SRAM"?

[wibble]

IOMMU group 3:

[8086:a36d] 00:14.0 USB controller: Intel Corporation Cannon Lake PCH USB 3.1 xHCI Host Controller (rev 10)

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

[8086:a36f] 00:14.2 RAM memory: Intel Corporation Cannon Lake PCH Shared SRAM (rev 10)

 

It sounds really important yet I did "BIND SELECTED TO VFIO AT BOOT" and rebooted expecting failure but Unraid seems fine.

 

I've yet to setup a VM to pass it through to, if it's vital would I only experience problems once it's actually passed through or does binding to VFIO alone make it unavailable to the host?

 

It's hard to Google up anything besides lists of devices but there was this success story.

 

I have a separate PCIe USB controller I could passthrough instead (used for the Unraid USB presently) but it's only bus-powered and the ports are less conveniently located. The motherboard's Intel controller would save me needing a different card / powered hub / longer cables.

Edited April 25, 2021 by wibble