Re: [PATCH v2 0/4] Have TTM support SEV encryption with coherent memory

[Daniel Vetter]

On Tue, Sep 03, 2019 at 03:15:00PM +0200, Thomas Hellström (VMware) wrote:
> With SEV memory encryption and in some cases also with SME memory
> encryption, coherent memory is unencrypted. In those cases, TTM doesn't
> set up the correct page protection. Fix this by having the TTM
> coherent page allocator call into the platform code to determine whether
> coherent memory is encrypted or not, and modify the page protection if
> it is not.
> 
> v2:
> - Use force_dma_unencrypted() rather than sev_active() to catch also the
>   special SME encryption cases.

We should probably cc Christoph Hellwig on this ... better to hear his
screams before merging than afterwards. As much as I don't support
screaming maintainers, that seems the least bad option here.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch