Messages in this thread | | | Date | Tue, 14 Jul 2020 21:29:30 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH 12/15] kmap: Add stray write protection for device pages |
| |
On Tue, Jul 14, 2020 at 12:06:16PM -0700, Ira Weiny wrote: > On Tue, Jul 14, 2020 at 10:44:51AM +0200, Peter Zijlstra wrote:
> > So, if I followed along correctly, you're proposing to do a WRMSR per > > k{,un}map{_atomic}(), sounds like excellent performance all-round :-( > > Only to pages which have this additional protection, ie not DRAM. > > User mappings of this memory is not affected (would be covered by User PKeys if > desired). User mappings to persistent memory are the primary use case and the > performant path.
Because performance to non-volatile memory doesn't matter? I think Dave has a better answer here ...
| |