RE: [PATCH 2/2] iommu/amd: Do not use IOMMUv2 functionality when SME is active

2020-08-26 Thread Deucher, Alexander 
[AMD Public Use]

+ Felix, Christian

> -Original Message-
> From: Joerg Roedel 
> Sent: Monday, August 24, 2020 6:54 AM
> To: iommu@lists.linux-foundation.org
> Cc: Joerg Roedel ; jroe...@suse.de; Lendacky, Thomas
> ; Suthikulpanit, Suravee
> ; Deucher, Alexander
> ; linux-ker...@vger.kernel.org
> Subject: [PATCH 2/2] iommu/amd: Do not use IOMMUv2 functionality when
> SME is active
> 
> From: Joerg Roedel 
> 
> When memory encryption is active the device is likely not in a direct mapped
> domain. Forbid using IOMMUv2 functionality for now until finer grained
> checks for this have been implemented.
> 
> Signed-off-by: Joerg Roedel 
> ---
>  drivers/iommu/amd/iommu_v2.c | 7 +++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/iommu/amd/iommu_v2.c
> b/drivers/iommu/amd/iommu_v2.c index c259108ab6dd..0d175aed1d92
> 100644
> --- a/drivers/iommu/amd/iommu_v2.c
> +++ b/drivers/iommu/amd/iommu_v2.c
> @@ -737,6 +737,13 @@ int amd_iommu_init_device(struct pci_dev *pdev,
> int pasids)
> 
>   might_sleep();
> 
> + /*
> +  * When memory encryption is active the device is likely not in a
> +  * direct-mapped domain. Forbid using IOMMUv2 functionality for
> now.
> +  */
> + if (mem_encrypt_active())
> + return -ENODEV;
> +
>   if (!amd_iommu_v2_supported())
>   return -ENODEV;
> 
> --
> 2.28.0
___
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

[PATCH 2/2] iommu/amd: Do not use IOMMUv2 functionality when SME is active

2020-08-24 Thread Joerg Roedel 
From: Joerg Roedel 

When memory encryption is active the device is likely not in a direct
mapped domain. Forbid using IOMMUv2 functionality for now until finer
grained checks for this have been implemented.

Signed-off-by: Joerg Roedel 
---
 drivers/iommu/amd/iommu_v2.c | 7 +++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c
index c259108ab6dd..0d175aed1d92 100644
--- a/drivers/iommu/amd/iommu_v2.c
+++ b/drivers/iommu/amd/iommu_v2.c
@@ -737,6 +737,13 @@ int amd_iommu_init_device(struct pci_dev *pdev, int pasids)
 
might_sleep();
 
+   /*
+* When memory encryption is active the device is likely not in a
+* direct-mapped domain. Forbid using IOMMUv2 functionality for now.
+*/
+   if (mem_encrypt_active())
+   return -ENODEV;
+
if (!amd_iommu_v2_supported())
return -ENODEV;
 
-- 
2.28.0

___
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu