virtio-mem for GPU Passthrough?

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I've tried running a VM with GPU Passthrough with memdev virtio-mem hoping that it will prevent vfio from pinning system 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

However, this didn't work. RAM spiked to 9GB. I've read that it's possible though? Am I doing something wrong or are vfio-pci host devices still not supported?

Best wishes,


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