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    Is Dynamic Memory Allocation and NVME passthrough supported?

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    • O Offline
      oifndiondgbj
      last edited by

      Hello, I'm new to the world of XCP-NG/XO so this might just be a case of new user missing something obvious. I've not got a clear answer from a search of the docs/forums, so figured it was worth asking.

      I'm running XCP-NG 8.3 on my host.

      I'm managing it with Xen Orchestra from sources (commit 8d39f).

      I've got a VM that I'd like to use for some basic Ollama/Openwebui tasks, so want to passthrough the Nvidia GPU from the host. I'm not using Ollama/Webui 24/7 so I'd also like to dynamically allocate RAM so that I don't have to consistently throw large quantities of the hosts RAM at it.

      For this reason, I configured the VM with the following memory setup:
      Static: 1 GiB/48 GiB
      Dynamic: 16 GiB/48 GiB

      When the VM is running, this configuration appears to work. I have the GPU passed through and the dynamic memory allocation set. When I stop the VM and attempt to start it again, the boot fails with the error:

      Error from xenguesthelper: Populate on Demand and PCI Passthrough are mutually exclusive

      If I adjust dynamic to be 48 GiB/48 GiB the machine will then boot. Once booted, I can then once again apply the desired dynamic config of 16 GiB/48 GiB.

      Am I misunderstanding the configuration options and this is just not supported, or have I stumbled across a bug?

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