[PATCH 0/2] iommu/amd: Use MAX buffer size when SNP is enabled on Family 0x19

[Vasant Hegde <vasant.hegde@amd.com>]

This series addresses CVE-2023-20585 [1] by increasing the AMD IOMMU
Event log and PPR log buffer sizes to the maximum supported value (512K)
on affected CPU families when SNP is enabled.

Use MAX buffer size when SNP is enabled on Milan/Genoa. Impacted buffers:
  - Milan : Event log (PPR/GALog is not supported when SNP is enabled)
  - Genoa : Event and PPR log (GALog is not supported when SNP is enabled)

[1] https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3016.html

Cc: Borislav Petkov <bp@alien8.de>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: Joerg Roedel <joerg.roedel@amd.com>

Vasant Hegde (2):
  iommu/amd: Use maximum Event log buffer size when SNP is enabled on Family 0x19
  iommu/amd: Use maximum PPR log buffer size when SNP is enabled on Family 0x19

 drivers/iommu/amd/amd_iommu.h       |   3 +
 drivers/iommu/amd/amd_iommu_types.h |  21 +++--
 drivers/iommu/amd/init.c            | 123 ++++++++++++++++++++--------
 drivers/iommu/amd/iommu.c           |   2 +-
 drivers/iommu/amd/ppr.c             |   8 +-
 5 files changed, 110 insertions(+), 47 deletions(-)

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2.31.1