PCI Passthrough
To enable PCI passthrough, you need to configure:
INTEL CPU
edit:
#vi /etc/default/grub
change
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on"
then
# update-grub
# reboot
Then run "dmesg | grep -e DMAR -e IOMMU" from the command line. If there is no output, then something is wrong.
AMD CPU
Edit:
# vi /etc/default/grub
Change:
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
To:
GRUB_CMDLINE_LINUX_DEFAULT="quiet amd_iommu=on"
Then:
# update-grub
# echo "options kvm allow_unsafe_assigned_interrupts=1" > /etc/modprobe.d/kvm_iommu_map_guest.conf
# reboot
Determine your PCI card address, and configure your VM
Locate your card using "lspci". The address should be in the form of: 04:00.0
Manually edit the node.conf file. It can be located at: /etc/pve/nodes/proxmox3/qemu-server/vmnumber.conf.
Add this line to the end of the file: "hostpci0: 04:00.0"
Verify Operation
Start the VM from the UI.
Enter the qm monitor. "qm monitor vmnumber"
Verify that your card is listed here: "info pci"
Then install drivers on your guest OS.
NOTE: Card support might be limited to 2 or 3 devices.
NOTE: This process will remove the card from the proxmox host OS.
Editorial Note: Using PCI passthrough to present drives direct to a ZFS (FreeNAS, Openfiler, OmniOS) virtual machine is dangerous on many levels and is not recommended for production use. Specific FreeNAS warnings can be found here: http://forums.freenas.org/threads/absolutely-must-virtualize-freenas-a-guide-to-not-completely-losing-your-data.12714/
PCI EXPRESS PASSTHROUGH
Since proxmox 3.3, it's possible to passthrough pci express device (including nvidia/amd graphic card)
you need to run pve-kernel 3.10
/etc/pve/qemuserver/<vmid>.cfg
simple pci-express passthrough
machine: q35 hostpci0: 04:00.0,pcie=1,driver=vfio
vga pci-express passthrough
machine: q35 hostpci0: 04:00.0,x-vga=on,pcie=1,driver=vfio
multi-function pciexpress device. (like a vga card with embedded audio chipset).
Remove the .0 in pci address.
machine: q35 hostpci0: 04:00,x-vga=on,pcie=1,driver=vfio
GPU PASSTHROUGH NOTES
MD RADEON 5xxx, 6xxx, 7xxx and NVIDIA GEFORCE 7, 8, 4xx, 5xx, 6xx, 7xx have been reported working with this, passing though an intel IGD'S WONT WORK
Maybe you'll need to load some specific options in grub.cfg or other tunning values,
here a good forum thread of archlinux: