From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f200.google.com (mail-io0-f200.google.com [209.85.223.200]) by kanga.kvack.org (Postfix) with ESMTP id 1591F6B0316 for ; Thu, 7 Sep 2017 14:50:06 -0400 (EDT) Received: by mail-io0-f200.google.com with SMTP id o77so619073ioo.5 for ; Thu, 07 Sep 2017 11:50:06 -0700 (PDT) Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41]) by mx.google.com with SMTPS id k82sor91201ita.59.2017.09.07.11.50.05 for (Google Transport Security); Thu, 07 Sep 2017 11:50:05 -0700 (PDT) Date: Thu, 7 Sep 2017 12:50:02 -0600 From: Tycho Andersen Subject: Re: [PATCH v6 03/11] mm, x86: Add support for eXclusive Page Frame Ownership (XPFO) Message-ID: <20170907185002.g5r5oaeyghtx2fgl@docker> References: <20170907173609.22696-1-tycho@docker.com> <20170907173609.22696-4-tycho@docker.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Ralph Campbell Cc: "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "kernel-hardening@lists.openwall.com" , Marco Benatto , Juerg Haefliger , "x86@kernel.org" 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org