Re: [PATCH v6 03/11] mm, x86: Add support for eXclusive Page Frame Ownership (XPFO)

Tycho Andersen
2017-09-07T18:50:06Z

On Thu, Sep 07, 2017 at 06:33:09PM +0000, Ralph Campbell wrote:
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -2736,6 +2736,8 @@
> >
> > nox2apic [X86-64,APIC] Do not enable x2APIC mode.
> >
> > + noxpfo [X86-64] Disable XPFO when CONFIG_XPFO is on.
> > +
> > cpu0_hotplug [X86] Turn on CPU0 hotplug feature when
> > CONFIG_BOOTPARAM_HOTPLUG_CPU0 is off.
> > Some features depend on CPU0. Known dependencies
> <... snip>
>
> A bit more description for system administrators would be very useful.
> Perhaps something like:
>
> noxpfo [XPFO,X86-64] Disable eXclusive Page Frame Ownership (XPFO)
> Physical pages mapped into user applications will also be mapped
> in the kernel's address space as if CONFIG_XPFO was not enabled.
>
> Patch 05 should also update kernel-parameters.txt and add "ARM64" to the config option list for noxpfo.

Nice catch, thanks. I'll fix both.

Cheers,

Tycho