Commit 15489780 authored by Yi Liu's avatar Yi Liu Committed by Joerg Roedel
Browse files

iommu/vt-d: Check correct capability for sagaw determination 



Check 5-level paging capability for 57 bits address width instead of
checking 1GB large page capability.

Fixes: 53fc7ad6 ("iommu/vt-d: Correctly calculate sagaw value of IOMMU")
Cc: stable@vger.kernel.org
Reported-by: default avatarRaghunathan Srinivasan <raghunathan.srinivasan@intel.com>
Signed-off-by: default avatarYi Liu <yi.l.liu@intel.com>
Reviewed-by: default avatarJerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Reviewed-by: default avatarRaghunathan Srinivasan <raghunathan.srinivasan@intel.com>
Link: https://lore.kernel.org/r/20220916071212.2223869-2-yi.l.liu@intel.com


Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 7ebb5f8e

drivers/iommu/intel/iommu.c

+1 −1
Original line number Diff line number Diff line
@@ -399,7 +399,7 @@ static unsigned long __iommu_calculate_sagaw(struct intel_iommu *iommu) 
{

	unsigned long fl_sagaw, sl_sagaw;



	fl_sagaw = BIT(2) | (cap_fl1gp_support(iommu->cap) ? BIT(3) : 0);

	fl_sagaw = BIT(2) | (cap_5lp_support(iommu->cap) ? BIT(3) : 0);

	sl_sagaw = cap_sagaw(iommu->cap);



	/* Second level only. */