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 852e40b13d2031507303fd520d81f72e894949f3..2b01dfde6cab155bd294af736e8b7260d06cbf7a 100644 (file)
--- 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;
                }
        }