2023-03-30 02:08:47 -04:00
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## Copyright (C) 2019 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
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2019-11-05 09:55:43 -05:00
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## See the file COPYING for copying conditions.
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## Enables IOMMU to prevent DMA attacks.
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2019-06-23 14:38:50 -04:00
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX intel_iommu=on amd_iommu=on"
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2020-02-14 13:52:01 -05:00
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## Disable the busmaster bit on all PCI bridges during very
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## early boot to avoid holes in IOMMU.
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##
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## https://mjg59.dreamwidth.org/54433.html
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## https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4444f8541dad16fefd9b8807ad1451e806ef1d94
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX efi=disable_early_pci_dma"
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2022-07-12 14:47:07 -04:00
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## Enables strict enforcement of IOMMU TLB invalidation so devices will never be able to access stale data contents
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## https://github.com/torvalds/linux/blob/master/drivers/iommu/Kconfig#L97
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## Page 11 of https://lenovopress.lenovo.com/lp1467.pdf
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GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX iommu.passthrough=0 iommu.strict=1"
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