This patchset dissable IOMMU groups. In other words, each device in system in it's own "fake" IOMMU group. Bypassing the IOMMU groups for GPU passthrough
This patchset only for motherboards with some messed IOMMU groups, when GPU may be in same IOMMU group as USB host device, or audiocard.
This patchet dissables IOMMU protection against I/O attacks from guest VM to host. Please, never use this patchset in production.
Clone repository to /etc/portage/patches direcotry with command
git clone https://github.com/feniksa/gentoo_ACS_override_patch.git /etc/portage/patches
Re-emerge gentoo-sources
emerge -v gentoo-sources
Re-compile patched kernel manually or with genkernell
genkernel all