Re: [patch V2 1/5] x86/kaiser: Respect disabled CPU features

[Thomas Gleixner]

On Mon, 27 Nov 2017, Peter Zijlstra wrote:
> On Mon, Nov 27, 2017 at 12:14:04AM +0100, Thomas Gleixner wrote:
> > PAGE_NX and PAGE_GLOBAL might be not supported or disabled on the command
> > line, but KAISER sets them unconditionally.
> 
> So KAISER is x86_64 only, right? AFAIK there is no x86_64 without NX
> support. So would it not make sense to mandate NX for KAISER?, that is
> instead of making "noexec" + KAISER work, make "noexec" kill KAISER +
> emit a warning.

OTOH, disabling NX is a simple way to verify that DEBUG_WX works correctly
also on the shadow maps.

But surely we can drop the PAGE_GLOBAL thing, as all 64bit systems have it.

Thanks,

	tglx