Signed-off-by: Markus Frank <m.fr...@proxmox.com> --- qm-pci-passthrough.adoc | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/qm-pci-passthrough.adoc b/qm-pci-passthrough.adoc index df6cf21..0db9b06 100644 --- a/qm-pci-passthrough.adoc +++ b/qm-pci-passthrough.adoc @@ -400,6 +400,31 @@ Example configuration with an `Intel GVT-g vGPU` (`Intel Skylake 6700k`): With this set, {pve} automatically creates such a device on VM start, and cleans it up again when the VM stops. +[[qm_pci_viommu]] +vIOMMU +~~~~~~ + +vIOMMU enables the option to passthrough pci devices to Level-2 VMs +in Level-1 VMs via Nested Virtualisation. + +Host Requirement: Add `intel_iommu=on` or `amd_iommu=on` +depending on your CPU to your kernel command line. + +VM Requirement: For both Intel and AMD CPUs, set `intel_iommu=on` +as the kernel parameter in the vIOMMU enabled VM, since qemu-server currently +uses the Intel variant. The guest vIOMMU only works with the *q35* machine +type and with *kvm* enabled. + +To enable vIOMMU, add `viommu=1` to the machine-parameter in the +configuration of the VM that should be able to passthrough pci devices. + +---- +# qm set VMID -machine q35,viommu=1 +---- + + +https://wiki.qemu.org/Features/VT-d + ifdef::wiki[] See Also -- 2.30.2 _______________________________________________ pve-devel mailing list pve-devel@lists.proxmox.com https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel