iommu/amd: Report SEV-TIO support

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The SEV-TIO switch in the AMD BIOS is reported to the OS via
the IOMMU Extended Feature 2 register (EFR2), bit 1.

Add helper to parse the bit and report the feature presence.

Signed-off-by: Alexey Kardashevskiy <aik@amd.com>
Link: https://patch.msgid.link/20251202024449.542361-4-aik@amd.com
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

...

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Alexey Kardashevskiy 2025-12-02 13:44:48 +11:00 • committed by Dan Williams

parent c3859de858

commit eeb934137d

3 changed files with 12 additions and 0 deletions

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1

drivers/iommu/amd/amd_iommu_types.h

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9

drivers/iommu/amd/init.c

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2

include/linux/amd-iommu.h

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