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You currently need a hyper-v host that is running at least Windows Insider Build 19640 in order to use Epyc with nested virtualization [1].  See if the beta compute driver works[2]. The hyper-v driver for ussuri has release notes[3], so it should be OK, although I haven't personally tried it.

Chris Apsey

[1] https://github.com/MicrosoftDocs/Virtualization-Documentation/issues/1276
[2] https://www.cloudbase.it/downloads/HyperVNovaCompute_Beta.msi
[3] https://docs.openstack.org/releasenotes/compute-hyperv/ussuri.html

-----Original Message-----
From: Eric K. Miller <emiller at genesishosting.com> 
Sent: Tuesday, August 4, 2020 1:03 AM
To: openstack-discuss at lists.openstack.org
Subject: [EXTERNAL] [nova] Hyper-V hosts

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Hi,

I thought I'd look into support of Hyper-V hosts for Windows Server environments, but it looks like the latest cloudbase Windows Hyper-V OpenStack Installer is for Train, and nothing seems to discuss the use of Hyper-V in Windows Server 2019.  Has it been abandoned?

Is anyone using Hyper-V with OpenStack successfully?  One of the reasons we thought we might support it is to provide nested support for VMs with GPUs and/or vGPUs, and thought this would work better than with KVM, specifically with AMD EPYC systems.  It seems that when "options kvm-amd nested=1" is used in a modprobe.d config file, Windows machines lock up when started.  I think this has been an issue for a while with AMD processors, but thought it was fixed recently (I don't remember where I saw this, though).

Would love to hear about any experiences related to Hyper-V and/or nested hypervisor support on AMD EPYC processors.

Thanks!

Eric