From: Vasant Hegde <vasant.hegde@amd.com>
Date: Thu, 21 Sep 2023 09:21:39 +0000 (+0000)
Subject: iommu/amd: Do not set amd_iommu_pgtable in pass-through mode
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4c721d6a085ca7baa4289bcf786c71684b2ef281;p=linux.git

iommu/amd: Do not set amd_iommu_pgtable in pass-through mode

Since AMD IOMMU page table is not used in passthrough mode, switching to
v1 page table is not required.

Therefore, remove redundant amd_iommu_pgtable update and misleading
warning message.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Link: https://lore.kernel.org/r/20230921092147.5930-7-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 852e40b13d203..2b01dfde6cab1 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -2134,9 +2134,6 @@ static int __init iommu_init_pci(struct amd_iommu *iommu)
 		    !iommu_feature(iommu, FEATURE_GT)) {
 			pr_warn("Cannot enable v2 page table for DMA-API. Fallback to v1.\n");
 			amd_iommu_pgtable = AMD_IOMMU_V1;
-		} else if (iommu_default_passthrough()) {
-			pr_warn("V2 page table doesn't support passthrough mode. Fallback to v1.\n");
-			amd_iommu_pgtable = AMD_IOMMU_V1;
 		}
 	}