[pve-devel] [PATCH docs 2/2] pci-passthrough: expand IOMMU section with notice about BIOS

Dominik Csapak d.csapak at proxmox.com
Wed Oct 27 09:27:32 CEST 2021

note that one must enable IOMMU support in the BIOS/UEFI.

Signed-off-by: Dominik Csapak <d.csapak at proxmox.com>
 qm-pci-passthrough.adoc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/qm-pci-passthrough.adoc b/qm-pci-passthrough.adoc
index dfc3d6e..edaa01f 100644
--- a/qm-pci-passthrough.adoc
+++ b/qm-pci-passthrough.adoc
@@ -45,7 +45,11 @@ some configuration to enable PCI(e) passthrough.
-The IOMMU has to be activated on the
+First, the IOMMU support has to be enabled in your BIOS/UEFI. Most often, that
+options is named `IOMMU` or `VT-d`, but check the manual for your motherboard
+for the exact option you need to enable.
+Then, the IOMMU has to be activated on the
 xref:sysboot_edit_kernel_cmdline[kernel commandline].
 The command line parameters are:

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