iommu/amd: Do not force direct mapping when SME is active

iommu/amd: Do not force direct mapping when SME is active

[ Upstream commit 7cad554887f1c5fd77e57e6bf4be38370c2160cb ]

Do not force devices supporting IOMMUv2 to be direct mapped when memory
encryption is active. This might cause them to be unusable because their
DMA mask does not include the encryption bit.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20200824105415.21000-2-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>