virtio-mem with virt-install to share memory between guest and host on-demand

[Daniel Krajnik <krajnik.dan@xxxxxxxxx>]

Hi

I'm trying to Passthrough a GPU to a VM and have it still share its free 
memory with the host (just like it would with virtio-balloon). Is this 
something virtio-mem is capable of? I've tried to run it, but it 
immediately took over 9GB of memory:

virt-install --name test --cpu 
cell0.cpus=0,cell0.memory=4194304,cell1.cpus=1,cell1.memory=4194304 
--memory maxMemory=65536,maxMemory.slots=8 --memdev 
model=virtio-mem,target.node=0,target.block=2048,target.size=1000 --disk 
size=400 --network network=ai 
--location=/tmp/debian-12.1.0-amd64-netinst.iso --os-variant=debian11 
--graphics none --extra-args "console=ttyS0

Best wishes,

Daniel

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