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vfio
A script for easy pci and usb passthrough along with disks, iso's and other useful flags for quick tinkering with less of a headache. I use it for VM gaming and other PCI/LiveCD/PXE/VM/RawImage testing given the script's accessibility.
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WorkOS
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I've been following this tutorial to the t (minus the ACS Override Patch section as my GPUs are in separate groups). I haven't run into any issues until it comes to creating the VM in virt-manager where the "Creating Virtual Machine" window gets stuck at "Creating domain". I left it like that for about half an hour just make sure it wasn't being slow and its still stuck. Forcing virt-manager to close and restarting it will result in it endlessly trying to connect to QEMU/KVM until I restart the system. I tried creating new VMs, starting at the stock configuration and slowly adding more custom options until it breaks, and it seems to work up until I add my PCI devices. I'm not really sure how to troubleshoot this so any help would be greatly appreciated, thank you.
It's up to you whether you want to reserve it for the VM at boot and never use it (Waste of resources imo) or just unbind the nvidia driver and pass it through on the fly. Some PCI devices don't like it I've heard, but I haven't had any trouble with my 2080ti. My script which I've been using and improving on/off over the past few years does it this way.