Re: [PATCH v5 06/16] x86/tdx: Make DMA pages shared

[Sathyanarayanan Kuppuswamy]

On 10/20/21 10:22 AM, Tom Lendacky wrote:
> > For non TDX case, in CC_ATTR_HOST_MEM_ENCRYPT, we should still call
> > amd_force_dma_unencrypted() right?
>
> What I'm saying is that you wouldn't have amd_force_dma_unencrypted(). I 
> think the whole force_dma_unencrypted() can exist as-is in a different 
> file, whether that's cc_platform.c or mem_encrypt_common.c.
>
> It will return true for an SEV or TDX guest, true for an SME host based 
> on the DMA mask or else false. That should work just fine for TDX.

Got it. Thanks for clarifying it.

--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer