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How likely is this to work? KVM/VFIO Single GPU Passthrough
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this post was submitted on 21 Sep 2023
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I don't know if you can do it in software with passthrough, as the guest controls the hardware and would need to coordinate things.
Using a KVM would be a hardware solution that would permit for one monitor, though.
I considered a KVM or something similar, but I still need access to the host machine in parallel (ideally side-by-side so I can step through the code running in the guest from a debugger in my dev environment on the host). I've already got a multi-monitor setup, so dedicating one of them to a VM while testing stuff isn't too much of a big deal - I just have to keep track of whether or not my hands are on separate keyboard+mouse for the guest :)
Ah, I gotcha. One keyboard/mouse, VM guest output in a window on the host would be ideal.
Run a VNC or RDP server on the guest VM, connect with a client on the host? That won't have quite the performance -- if you're debugging a 3d game and playing it as part of it, you'll get latency, so that won't be a good solution for OP -- but that may not matter for your use case.