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Add info about IOMMU on Qubes 4.0 and 4.1

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Enjeck Cleopatra 2020-11-18 16:52:55 +01:00 • committed by GitHub
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user/troubleshooting/installation-troubleshooting.md
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@ -88,4 +88,8 @@ This error message indicates that IOMMU-virtualization hasn’t been activated i
Return to the [hardware requirements][hardware-reqs] section to learn how to activate it.
If the setting is not configured correctly, it means that your hardware won’t be able to leverage some Qubes security features, such as a strict isolation of the networking and USB hardware.
In Qubes 4.0, the default installation won't function properly without IOMMU, as default sys-net and sys-usb qubes require IOMMU. It is possible to configure them to reduce isolation and not use IOMMU by changing virtualization mode of these two VMs to "PV".
In Qubes 4.1, IOMMU is strictly required, even when the virtualization mode of a VM is changed to "PV"; it is not possible to use Qubes on a system without IOMMU.
[hardware-reqs]: /doc/installation-guide/#hardware-requirements