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How to enable DMA for passthrough GPUs?

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I have a 8-GPU server running Proxmox. The GPUs themselves work great using:

Code:
qm set 315 --hostpci0 4f:00,pcie=1
qm set 315 --hostpci1 52:00,pcie=1
qm set 315 --hostpci2 56:00,pcie=1
qm set 315 --hostpci3 57:00,pcie=1
qm set 315 --hostpci4 ce:00,pcie=1
qm set 315 --hostpci5 d1:00,pcie=1
qm set 315 --hostpci6 d5:00,pcie=1
qm set 315 --hostpci7 d6:00,pcie=1

But running nvidia-smi topo -m on a VM gives this:

Code:
    GPU0        GPU1    GPU2    GPU3    GPU4    GPU5    GPU6    GPU7...

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