From 48dc345a23b984c457d1c5878168d026c500618f Mon Sep 17 00:00:00 2001 From: Vasant Hegde Date: Thu, 30 May 2024 07:11:18 +0000 Subject: [PATCH] iommu/amd: Check EFR[EPHSup] bit before enabling PPR Check for EFR[EPHSup] bit before enabling PPR. This bit must be set to enable PPR. Reported-by: Borislav Petkov Fixes: c4cb23111103 ("iommu/amd: Add support for enable/disable IOPF") Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218900 Tested-by: Borislav Petkov Tested-by: Jean-Christophe Guillain Signed-off-by: Vasant Hegde Reviewed-by: Suravee Suthikulpanit Link: https://lore.kernel.org/r/20240530071118.10297-1-vasant.hegde@amd.com Signed-off-by: Joerg Roedel --- drivers/iommu/amd/amd_iommu.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h index 2fde1302a584..2d5945c982bd 100644 --- a/drivers/iommu/amd/amd_iommu.h +++ b/drivers/iommu/amd/amd_iommu.h @@ -129,7 +129,8 @@ static inline int check_feature_gpt_level(void) static inline bool amd_iommu_gt_ppr_supported(void) { return (check_feature(FEATURE_GT) && - check_feature(FEATURE_PPR)); + check_feature(FEATURE_PPR) && + check_feature(FEATURE_EPHSUP)); } static inline u64 iommu_virt_to_phys(void *vaddr)