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 <[email protected]> Fixes: c4cb231 ("iommu/amd: Add support for enable/disable IOPF") Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218900 Tested-by: Borislav Petkov <[email protected]> Tested-by: Jean-Christophe Guillain <[email protected]> Signed-off-by: Vasant Hegde <[email protected]> Reviewed-by: Suravee Suthikulpanit <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Joerg Roedel <[email protected]>
litex-hub · Jun 4, 2024 · 48dc345 · 48dc345
1 parent 998a0a3
commit 48dc345
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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)