From: Andi Kleen <ak@suse.de>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Roland McGrath <roland@redhat.com>,
Andi Kleen <ak@suse.de>,
virtualization <virtualization@lists.osdl.org>
Subject: Re: [patch] paravirt: VDSO page is essential
Date: Mon, 5 Mar 2007 15:34:37 +0100 [thread overview]
Message-ID: <20070305143437.GF22829@bingen.suse.de> (raw)
In-Reply-To: <1173101297.26165.39.camel@localhost.localdomain>
> VDSO is only a problem if (1) the hypervisor wants to reserve the top
> virtual address space (CONFIG_PARAVIRT=y), and (2) the glibc is old and
It broke the boot even with native hardware, no hypervisor
>
> +config RESERVE_TOP
> + bool
> + help
> + Many hypervisors want to reserve some amount of the top of
> + virtual address space. Unfortunately, old glibc needs the
> + vdso page there, so we must disable vdso if COMPAT_VDSO is
> + enabled as well as this option.
But this still means I would need to decide between a PARAVIRT
kernel that either supports xen/VMI or cannot boot old user land without
weird options. I don't think that's the correct solution. The goal
is a single binary that runs everywhere and is still compatible.
What would probably work is to somehow decide at runtime if a hypervisor
is there or not and then set vdso default based on that. I guess that
detection would be hypervisor specific though and probably would
need paravirt ops extensions.
-Andi
next prev parent reply other threads:[~2007-03-05 14:34 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-05 12:06 [patch] paravirt: VDSO page is essential Ingo Molnar
2007-03-05 12:36 ` Avi Kivity
2007-03-05 12:40 ` Ingo Molnar
2007-03-05 13:00 ` Avi Kivity
2007-03-05 13:32 ` Rusty Russell
2007-03-05 14:28 ` Andi Kleen
2007-03-05 13:48 ` Ingo Molnar
2007-03-05 14:58 ` Andi Kleen
2007-03-05 13:59 ` Ingo Molnar
2007-03-05 14:10 ` Avi Kivity
2007-03-05 14:10 ` Ingo Molnar
2007-03-05 13:28 ` Rusty Russell
2007-03-05 13:38 ` Ingo Molnar
2007-03-05 14:34 ` Andi Kleen [this message]
2007-03-05 13:46 ` [patch] paravirt: re-enable COMPAT_VDSO Ingo Molnar
2007-03-05 13:48 ` [patch] paravirt: VDSO page is essential Ingo Molnar
2007-03-05 20:11 ` Zachary Amsden
2007-03-05 20:11 ` Zachary Amsden
2007-03-05 20:16 ` Andi Kleen
2007-03-05 20:33 ` Zachary Amsden
2007-03-05 20:19 ` Ingo Molnar
2007-03-05 20:19 ` Ingo Molnar
2007-03-05 20:42 ` Zachary Amsden
2007-03-05 20:42 ` Zachary Amsden
2007-03-06 0:57 ` Rusty Russell
2007-03-06 1:03 ` Zachary Amsden
2007-03-06 1:11 ` Rusty Russell
2007-03-06 1:11 ` Rusty Russell
2007-03-06 1:14 ` Jeremy Fitzhardinge
2007-03-06 1:51 ` Zachary Amsden
2007-03-06 1:53 ` Jeremy Fitzhardinge
2007-03-06 1:53 ` Jeremy Fitzhardinge
2007-03-06 8:19 ` Xen & VMI? Ingo Molnar
2007-03-06 8:19 ` Ingo Molnar
2007-03-06 8:37 ` Gerd Hoffmann
2007-03-06 8:48 ` Zachary Amsden
2007-03-06 8:52 ` Ingo Molnar
2007-03-06 8:52 ` Ingo Molnar
2007-03-06 9:03 ` Zachary Amsden
2007-03-06 9:03 ` Zachary Amsden
2007-03-06 9:10 ` Ingo Molnar
2007-03-06 9:10 ` Ingo Molnar
2007-03-06 9:15 ` Gerd Hoffmann
2007-03-06 9:15 ` Gerd Hoffmann
2007-03-06 9:34 ` Ingo Molnar
2007-03-06 10:15 ` Gerd Hoffmann
2007-03-06 10:15 ` Gerd Hoffmann
2007-03-06 10:26 ` Ingo Molnar
2007-03-06 10:26 ` Ingo Molnar
2007-03-06 11:04 ` Gerd Hoffmann
2007-03-06 11:59 ` Ingo Molnar
2007-03-06 12:34 ` Gerd Hoffmann
2007-03-06 15:03 ` Anthony Liguori
2007-03-06 15:03 ` Anthony Liguori
2007-03-06 17:17 ` Nakajima, Jun
2007-03-06 17:17 ` Nakajima, Jun
2007-03-06 17:32 ` Anthony Liguori
2007-03-06 20:37 ` Ingo Molnar
2007-03-06 21:02 ` Jeremy Fitzhardinge
2007-03-06 21:02 ` Jeremy Fitzhardinge
2007-03-06 21:11 ` Ingo Molnar
2007-03-06 21:11 ` Ingo Molnar
2007-03-06 21:13 ` Jeremy Fitzhardinge
2007-03-06 21:13 ` Jeremy Fitzhardinge
2007-03-06 21:20 ` Ingo Molnar
2007-03-06 21:20 ` Ingo Molnar
2007-03-06 21:46 ` Jeremy Fitzhardinge
2007-03-06 21:46 ` Jeremy Fitzhardinge
2007-03-06 21:35 ` Nakajima, Jun
2007-03-06 21:35 ` Nakajima, Jun
2007-03-07 0:44 ` Rusty Russell
2007-03-07 0:54 ` Anthony Liguori
2007-03-07 0:54 ` Anthony Liguori
2007-03-07 3:06 ` Zachary Amsden
2007-03-07 8:15 ` Ingo Molnar
2007-03-07 8:15 ` Ingo Molnar
2007-03-07 9:17 ` Zachary Amsden
2007-03-07 11:15 ` Thomas Gleixner
2007-03-07 19:14 ` Dan Hecht
2007-03-06 16:27 ` Jeremy Fitzhardinge
2007-03-06 17:11 ` Ingo Molnar
2007-03-06 17:33 ` Jeremy Fitzhardinge
2007-03-07 2:16 ` Zachary Amsden
2007-03-07 2:16 ` Zachary Amsden
2007-03-06 9:55 ` Avi Kivity
2007-03-06 10:23 ` Gerd Hoffmann
2007-03-06 10:31 ` Ingo Molnar
2007-03-06 19:46 ` Chris Wright
2007-03-06 19:46 ` Chris Wright
2007-03-06 20:30 ` Ingo Molnar
2007-03-06 20:30 ` Ingo Molnar
2007-03-06 20:53 ` Chris Wright
2007-03-06 21:03 ` Ingo Molnar
2007-03-06 21:03 ` Ingo Molnar
2007-03-06 21:28 ` Chris Wright
2007-03-06 21:28 ` Chris Wright
2007-03-07 2:35 ` Zachary Amsden
2007-03-07 2:35 ` Zachary Amsden
2007-03-06 9:07 ` Jeremy Fitzhardinge
2007-03-06 9:07 ` Jeremy Fitzhardinge
2007-03-06 9:26 ` Ingo Molnar
2007-03-06 9:26 ` Ingo Molnar
2007-03-06 16:42 ` Jeremy Fitzhardinge
2007-03-06 16:42 ` Jeremy Fitzhardinge
2007-03-06 17:18 ` Ingo Molnar
2007-03-06 17:18 ` Ingo Molnar
2007-03-06 18:04 ` Jeremy Fitzhardinge
2007-03-06 18:04 ` Jeremy Fitzhardinge
2007-03-06 7:35 ` [patch] paravirt: VDSO page is essential Ingo Molnar
2007-03-06 7:35 ` Ingo Molnar
2007-03-06 7:42 ` Zachary Amsden
2007-03-06 7:50 ` Ingo Molnar
2007-03-06 7:50 ` Ingo Molnar
2007-03-06 18:48 ` Jeremy Fitzhardinge
2007-03-06 18:48 ` Jeremy Fitzhardinge
2007-03-05 14:27 ` Andi Kleen
2007-03-05 21:58 ` Roland McGrath
2007-03-05 22:01 ` Jeremy Fitzhardinge
2007-03-05 22:58 ` Roland McGrath
2007-03-05 23:03 ` Jeremy Fitzhardinge
2007-03-06 8:34 ` Ingo Molnar
2007-03-06 9:13 ` Roland McGrath
2007-03-06 9:14 ` Jeremy Fitzhardinge
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