From: Waiman Long <longman@redhat.com>
To: Khalid Aziz <khalid.aziz@oracle.com>, Ingo Molnar <mingo@kernel.org>
Cc: juergh@gmail.com, tycho@tycho.ws, jsteckli@amazon.de,
keescook@google.com, konrad.wilk@oracle.com,
Juerg Haefliger <juerg.haefliger@canonical.com>,
deepa.srinivasan@oracle.com, chris.hyser@oracle.com,
tyhicks@canonical.com, dwmw@amazon.co.uk,
andrew.cooper3@citrix.com, jcm@redhat.com,
boris.ostrovsky@oracle.com, iommu@lists.linux-foundation.org,
x86@kernel.org, linux-arm-kernel@lists.infradead.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-security-module@vger.kernel.org,
Khalid Aziz <khalid@gonehiking.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Dave Hansen <dave@sr71.net>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Arjan van de Ven <arjan@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [RFC PATCH v9 03/13] mm: Add support for eXclusive Page Frame Ownership (XPFO)
Date: Wed, 1 May 2019 10:49:44 -0400 [thread overview]
Message-ID: <35c4635e-8214-7dde-b4ec-4cb266b2ea10@redhat.com> (raw)
In-Reply-To: <e16c1d73-d361-d9c7-5b8e-c495318c2509@oracle.com>
On Wed, Apr 03, 2019 at 11:34:04AM -0600, Khalid Aziz wrote:
> diff --git a/Documentation/admin-guide/kernel-parameters.txt
b/Documentation/admin-guide/kernel-parameters.txt
> index 858b6c0b9a15..9b36da94760e 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -2997,6 +2997,12 @@
>
> nox2apic [X86-64,APIC] Do not enable x2APIC mode.
>
> + noxpfo [XPFO] Disable eXclusive Page Frame Ownership (XPFO)
> + when CONFIG_XPFO is on. Physical pages mapped into
> + user applications will also be mapped in the
> + kernel's address space as if CONFIG_XPFO was not
> + enabled.
> +
> cpu0_hotplug [X86] Turn on CPU0 hotplug feature when
> CONFIG_BO OTPARAM_HOTPLUG_CPU0 is off.
> Some features depend on CPU0. Known dependencies are:
Given the big performance impact that XPFO can have. It should be off by
default when configured. Instead, the xpfo option should be used to
enable it.
Cheers,
Longman
next prev parent reply other threads:[~2019-05-01 14:49 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1554248001.git.khalid.aziz@oracle.com>
2019-04-04 16:44 ` [RFC PATCH v9 00/13] Add support for eXclusive Page Frame Ownership Nadav Amit
2019-04-04 17:18 ` Khalid Aziz
[not found] ` <f1ac3700970365fb979533294774af0b0dd84b3b.1554248002.git.khalid.aziz@oracle.com>
2019-04-17 16:15 ` [RFC PATCH v9 03/13] mm: Add support for eXclusive Page Frame Ownership (XPFO) Ingo Molnar
2019-04-17 16:49 ` Khalid Aziz
2019-04-17 17:09 ` Ingo Molnar
2019-04-17 17:19 ` Nadav Amit
2019-04-17 17:26 ` Ingo Molnar
2019-04-17 17:44 ` Nadav Amit
2019-04-17 21:19 ` Thomas Gleixner
[not found] ` <CAHk-=wgBMg9P-nYQR2pS0XwVdikPCBqLsMFqR9nk=wSmAd4_5g@mail.gmail.com>
2019-04-17 23:42 ` Thomas Gleixner
2019-04-17 23:52 ` Linus Torvalds
2019-04-18 4:41 ` Andy Lutomirski
2019-04-18 5:41 ` Kees Cook
2019-04-18 14:34 ` Khalid Aziz
2019-04-22 19:30 ` Khalid Aziz
2019-04-22 22:23 ` Kees Cook
2019-04-18 6:14 ` Thomas Gleixner
2019-04-17 17:33 ` Khalid Aziz
2019-04-17 19:49 ` Andy Lutomirski
2019-04-17 19:52 ` Tycho Andersen
2019-04-17 20:12 ` Khalid Aziz
2019-05-01 14:49 ` Waiman Long [this message]
2019-05-01 15:18 ` Khalid Aziz
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