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pcie-passthrough: add short note about iommu passthrough mode

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that explains in one sentence what it does, that it can increase
performance and how to activate it.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
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Dominik Csapak 2022-05-20 10:43:25 +02:00 committed by Thomas Lamprecht
parent e51a78cdbc
commit a4c6084830
1 changed files with 18 additions and 0 deletions
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18
qm-pci-passthrough.adoc
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@ -62,6 +62,24 @@ The command line parameters are:
----
* for AMD CPUs it should be enabled automatically.
If your hardware supports it, enabling IOMMU passthrough mode might increase
performance, because then the VMs bypass the (default) DMA translation
which is normally done by the hypervisor, before handing DMA requests off to
the hardware IOMMU. You can enable it with adding
----
iommu.passthrough=1
----
or
----
iommu=pt
----
to the kernel commandline.
.Kernel Modules
You have to make sure the following modules are loaded. This can be achieved by