Linux 5.6 Continues Work On Intel VT-d Nested Mode Support
Written by Michael Larabel in Linux Kernel on 5 February 2020 at 09:38 AM EST. Add A Comment
LINUX KERNEL --
The IOMMU changes have been sent in for the ongoing Linux 5.6 kernel merge window.

On the Intel front with the IOMMU driver changes are prep patches for Intel VT-d nested mode support. The changes also allow for toggling VT-d Scalable Mode via a new Kconfig switch INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON though this is just in regards to the default kernel behavior and can Scalable Mode with VT-d 3.0 can still be forced on at run-time with the intel_iommu=sm_on kernel option.

Besides the IOMMU VT-d work on nested mode support, there are also AMD IOMMU changes. The AMD changes for this kernel version amount to code clean-ups and refining their x2APIC detection.

There are also numerous ARM changes this time around, all of which are laid out via this pull request.
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