From: "H. Peter Anvin" <hpa@zytor.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Ian Campbell <ijc@hellion.org.uk>,
Joel Becker <Joel.Becker@oracle.com>,
Jody Belka <lists-lkml@pimb.org>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
Andi Kleen <andi@firstfloor.org>,
Mika Penttila <mika.penttila@kolumbus.fi>
Subject: Re: 2.6.25-rc1 xen pvops regression
Date: Thu, 21 Feb 2008 15:26:56 -0800 [thread overview]
Message-ID: <47BE08C0.5060700@zytor.com> (raw)
In-Reply-To: <47BE05C0.2090405@goop.org>
Jeremy Fitzhardinge wrote:
>
> It seems to me that those pages are being handed out as heap pages by
> the early allocator. In the Xen case this is OK because there's nothing
> magic about them. But if real hardware doesn't reserve these pages in
> the E820 map, then they could end up being used as regular memory by
> mistake, which is an issue.
>
No, they couldn't.
On real hardware they'll be memory types 0 or 2, depending on whether or
not they're marked reserved.
Available RAM is type 1.
-hpa
next prev parent reply other threads:[~2008-02-21 23:32 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-12 23:54 2.6.25-rc1 xen pvops regression Jody Belka
2008-02-13 11:59 ` Jeremy Fitzhardinge
2008-02-13 12:13 ` Jody Belka
2008-02-13 12:23 ` Ingo Molnar
2008-02-14 2:27 ` Joel Becker
2008-02-14 7:50 ` Jeremy Fitzhardinge
2008-02-15 20:23 ` Joel Becker
2008-02-16 2:44 ` Jeremy Fitzhardinge
2008-02-16 8:54 ` Joel Becker
2008-02-16 11:46 ` Jeremy Fitzhardinge
2008-02-17 6:29 ` Joel Becker
2008-02-17 12:09 ` Jeremy Fitzhardinge
2008-02-17 6:39 ` Joel Becker
2008-02-17 18:49 ` Ian Campbell
2008-02-18 10:40 ` Joel Becker
2008-02-19 21:50 ` Ian Campbell
2008-02-19 21:59 ` Ian Campbell
2008-02-20 7:43 ` H. Peter Anvin
2008-02-20 8:51 ` Ian Campbell
2008-02-20 21:42 ` Joel Becker
2008-02-20 22:30 ` Ian Campbell
2008-02-20 21:58 ` Jeremy Fitzhardinge
2008-02-20 22:29 ` Ian Campbell
2008-02-21 21:16 ` Jeremy Fitzhardinge
2008-02-21 21:21 ` H. Peter Anvin
2008-02-21 21:37 ` Jeremy Fitzhardinge
2008-02-21 21:44 ` H. Peter Anvin
2008-02-21 22:12 ` Ian Campbell
2008-02-21 22:23 ` H. Peter Anvin
2008-02-21 22:49 ` Jeremy Fitzhardinge
2008-02-21 22:58 ` H. Peter Anvin
2008-02-22 7:25 ` Ian Campbell
2008-02-22 9:28 ` Alan Cox
2008-02-22 9:55 ` Andi Kleen
2008-02-22 10:00 ` Alan Cox
2008-02-22 10:15 ` Andi Kleen
2008-02-22 16:27 ` H. Peter Anvin
2008-02-22 19:25 ` Pavel Machek
2008-02-26 17:06 ` Mark McLoughlin
2008-02-26 20:05 ` Jeremy Fitzhardinge
2008-02-21 22:58 ` Joel Becker
2008-02-21 22:04 ` Eric W. Biederman
2008-02-21 23:14 ` Jeremy Fitzhardinge
2008-02-21 23:26 ` H. Peter Anvin [this message]
2008-02-21 23:46 ` Jeremy Fitzhardinge
2008-02-21 23:57 ` H. Peter Anvin
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