Re: [PATCHv2 06/14] mm/page_alloc: Propagate encryption KeyID through page allocator

[Michal Hocko]

On Wed 28-03-18 19:55:32, Kirill A. Shutemov wrote:
> Modify several page allocation routines to pass down encryption KeyID to
> be used for the allocated page.
> 
> There are two basic use cases:
> 
>  - alloc_page_vma() use VMA's KeyID to allocate the page.
> 
>  - Page migration and NUMA balancing path use KeyID of original page as
>    KeyID for newly allocated page.

I am sorry but I am out of time to look closer but this just raised my
eyebrows. This looks like a no-go. The basic allocator has no business
in fancy stuff like a encryption key. If you need something like that
then just build a special allocator API on top. This looks like a no-go
to me.
-- 
Michal Hocko
SUSE Labs