Date: Thu, 7 Sep 2017 12:50:02 -0600 From: Tycho Andersen <tycho@...ker.com> To: Ralph Campbell <rcampbell@...dia.com> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Marco Benatto <marco.antonio.780@...il.com>, Juerg Haefliger <juerg.haefliger@...onical.com>, "x86@...nel.org" <x86@...nel.org> Subject: Re: [PATCH v6 03/11] mm, x86: Add support for eXclusive Page Frame Ownership (XPFO) 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
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