Re: [PATCH v1 2/3] virt: tdx-guest: Add Quote generation support

[Greg KH]

On Sun, Mar 26, 2023 at 12:06:26PM -0700, Sathyanarayanan Kuppuswamy wrote:
> If usage of DMA APIs / platform device is not acceptable for this use case,

It is not ok to use a platform device for this because you just do not
have a platform device for it, don't make one up out of thin air please,
as that really doesn't even have the correct bindings to the DMA memory
that you want here.

> an alternative approach is to allocate a fixed number of shared buffers during
> the TDX guest driver probe and use it for GetQuote requests. Although it would
> limit the amount of memory we can use for GetQuote requests at a time and also
> reserve a chunk of memory during the init() time, I think it is an acceptable
> tradeoff when compared to alternative choices. The AMD SEV guest driver also
> adopts the similar approach. Please let me know if this approach is acceptable.

This sounds like a better approach.

thanks,

greg k-h