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Ubuntu - GPU - GPU pass-through

How to assign a GPU graphics card on the host machine to a virtualized guest.

Verify the host environment supports GPU pass-through

TODO:

Enable IOMMU

IOMMU is usually disabled by default.

It needs to be enable at boot time in the /etc/default/grub configuration file.

For AMD-based hosts:

/etc/default/grub

GRUB_CMDLINE_LINUX="iommu=pt amd_iommu=on rd.driver.pre=vfio-pci"

For Intel-based hosts:

/etc/default/grub

GRUB_CMDLINE_LINUX="intel_iommu=on iommu=pt rd.driver.pre=vfio-pci"

Re-generate the main GRUB 2 configuration file

The GRUB 2 configuration file is /boot/grub2/grub.cfg.

sudo grub2-mkconfig -o /boot/grub2/grub.cfg

Reboot

Verify that IOMMU is enabled

sudo dmesg | grep -e DMAR -e IOMMU

returns:

[    2.172228] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
[    2.176588] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[    2.176924] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank).
[    3.875165] AMD-Vi: AMD IOMMUv2 loaded and initialized

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