[pve-devel] [PATCH docs] passthrough: viommu: replace host requirement with reference to pcie passthrough

[Markus Frank]

Enabling IOMMU on the host is not a requirement for vIOMMU. It is only
a requirement for passthrough. Add a sentence to clarify the need for a
configured PCI(e) passthrough on the host for passthrough to nested VMs.

Suggested-by: Dominik Csapak <d.csapak at proxmox.com>
Signed-off-by: Markus Frank <m.frank at proxmox.com>
---
This patch replaces the "[PATCH docs] passthrough: viommu: remove
'amd_iommu=on' from the docs" patch:
https://lists.proxmox.com/pipermail/pve-devel/2024-April/063688.html

 qm-pci-passthrough.adoc | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/qm-pci-passthrough.adoc b/qm-pci-passthrough.adoc
index bbd6b85..fd0872e 100644
--- a/qm-pci-passthrough.adoc
+++ b/qm-pci-passthrough.adoc
@@ -505,14 +505,12 @@ vIOMMU (emulated IOMMU)
 
 vIOMMU is the emulation of a hardware IOMMU within a virtual machine, providing
 improved memory access control and security for virtualized I/O devices. Using
-the vIOMMU option also allows you to pass through PCI devices to level-2 VMs in
-level-1 VMs via https://pve.proxmox.com/wiki/Nested_Virtualization[Nested Virtualization].
-There are currently two vIOMMU implementations available: Intel and VirtIO.
-
-Host requirement:
+the vIOMMU option also allows you to pass through PCI(e) devices to level-2 VMs
+in level-1 VMs via https://pve.proxmox.com/wiki/Nested_Virtualization[Nested Virtualization].
+To pass through physical PCI(e) devices from the host to nested VMs, follow the
+PCI(e) passthrough instructions.
 
-* Add `intel_iommu=on` or `amd_iommu=on` depending on your CPU to your kernel
-command line.
+There are currently two vIOMMU implementations available: Intel and VirtIO.
 
 Intel vIOMMU
 ^^^^^^^^^^^^
-- 
2.39.2