Re: [PATCH v7 15/22] dma-direct: pass attrs to dma_capable() for DMA_ATTR_CC_SHARED checks

[Jason Gunthorpe]

On Wed, Jul 01, 2026 at 11:19:19AM +0530, Aneesh Kumar K.V (Arm) wrote:
> Teach dma_capable() about DMA_ATTR_CC_SHARED so the capability
> check can reject encrypted DMA addresses for devices that require
> unencrypted/shared DMA.
> 
> Also propagate DMA_ATTR_CC_SHARED in swiotlb_map() when the selected
> SWIOTLB pool is decrypted so the capability check sees the correct DMA
> address attribute.
> 
> Tested-by: Jiri Pirko <jiri@xxxxxxxxxx>
> Tested-by: Michael Kelley <mhklinux@xxxxxxxxxxx>
> Tested-by: Mostafa Saleh <smostafa@xxxxxxxxxx>
> Reviewed-by: Petr Tesarik <ptesarik@xxxxxxxx>
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@xxxxxxxxxx>
> ---
>  arch/x86/kernel/amd_gart_64.c | 30 ++++++++++++++++--------------
>  drivers/xen/swiotlb-xen.c     |  6 +++---
>  include/linux/dma-direct.h    | 10 +++++++++-
>  kernel/dma/direct.h           |  6 +++---
>  kernel/dma/swiotlb.c          |  2 +-
>  5 files changed, 32 insertions(+), 22 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Jason