Access Control Services (ACS) on MSI motherboard / Hyper-V

[teltersat]

I’m working on a side project to get a Windows Docker instance of Plex to be able to use hardware decoding. I’m trying to enable ACS on my motherboard after a sidegrade (MSI MAG B550 Tomahawk) and currently Windows is unable to leverage the GPU for partitioning. However, Windows is not able to use ACS because it keeps stating that the feature has not been enabled at a BIOS level. While I have SR-IOV and IOMMU enabled right now, I can’t find for the love of my life where I can configure the ACS option. Does anyone have any idea?

Note 1: Some responses on the MSI forum say that this is not enabled at all and some people are not able to getting it to work. If I can’t get this to work, I do plan to migrate next year to an AM5 platform. Asking here in case anyone knows how to get ACS working.

PS / Disclaimer: I host my personal infra on Windows because I like hosting my personal infra on Windows.

[teltersat]

Nevermind, I found the most likely answer: ACS is only available on the X#70 Chipsets. I had it on my previous X370, I read reports about the X570 allowing ACS as well. I guess I can put this on pause until I get to upgrade the Mobo and the CPU all at once.