Re: [PATCH 04/24] x86/mm/kaiser: Unmap kernel mappings from userspace page tables, core patch

[Dave Hansen]

On 11/27/2017 07:39 AM, Peter Zijlstra wrote:
> So I had the problem that I could not tell if my shiny new kernel had
> this brand spanking awesome feature enabled or not.
> 
> Do we want something like so?

I eventually shoved one of these in the (buggy) runtime enable/disable
patch.  But, yeah, we do.