On Mon, Jul 09, 2018 at 11:44:33AM -0700, Dave Hansen wrote: > On 07/09/2018 11:36 AM, Konrad Rzeszutek Wilk wrote: > > On Tue, Jun 26, 2018 at 05:22:45PM +0300, Kirill A. Shutemov wrote: > > Rip out the X86? > >> + bool "Intel Multi-Key Total Memory Encryption" > >> + select DYNAMIC_PHYSICAL_MASK > >> + select PAGE_EXTENSION > > > > And maybe select 5-page? > > Why? It's not a strict dependency. You *can* build a 4-level kernel > and run it on smaller systems. Sure, but in one of his commits he mentions that we may run in overlapping physical memory if we use 4-level paging. Hence why not just move to 5-level paging and simplify this. > > >> + depends on X86_64 && CPU_SUP_INTEL > >> + ---help--- > >> + Say yes to enable support for Multi-Key Total Memory Encryption. > >> + This requires an Intel processor that has support of the feature. > >> + > >> + Multikey Total Memory Encryption (MKTME) is a technology that allows > >> + transparent memory encryption in and upcoming Intel platforms. > > > > How about saying which CPUs? Or just dropping this? > > We don't have any information about specifically which processors with > have this feature to share. But, this config text does tell someone > that they can't use this feature on today's platforms. > > We _did_ say this for previous features (protection keys stands out > where we said it was for "Skylake Servers" IIRC), but we are not yet > able to do the same for this feature.
