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Add info about IOMMU on Qubes 4.0 and 4.1
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@ -88,4 +88,8 @@ This error message indicates that IOMMU-virtualization hasn’t been activated i
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Return to the [hardware requirements][hardware-reqs] section to learn how to activate it.
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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.
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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".
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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.
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[hardware-reqs]: /doc/installation-guide/#hardware-requirements
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