From: Ingo Molnar <mingo@elte.hu>
To: Zachary Amsden <zach@vmware.com>
Cc: virtualization <virtualization@lists.osdl.org>,
Roland McGrath <roland@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Jan Beulich <jbeulich@novell.com>,
linux-kernel@vger.kernel.org
Subject: Re: Xen & VMI?
Date: Tue, 6 Mar 2007 10:10:06 +0100 [thread overview]
Message-ID: <20070306091006.GA26073@elte.hu> (raw)
In-Reply-To: <45ED2E63.3070700@vmware.com>
* Zachary Amsden <zach@vmware.com> wrote:
> > > reduces the QA effort. You still have 5 Hypervisors you have to
> > > test against.
> >
> > yes, just like we have thousands of separate PC boards to support.
> > But as long as the basic ABI is the same, the QA effort on the Linux
> > kernel side is alot more focused. (Distros still have
> > 18446744073709551616 total combinations to QA, and have to make an
> > educated guess to reduce that to a more manageable number.)
>
> But hardware PC boards don't do anything as remotely complicate as
> changing the semantics required for correctness in you MMU
> implementation. [...]
ugh, PC boards are actually far worse and far more diverse than any
variances between hypervisors, but i digress.
anyway, my point stands: the Linux kernel is significantly more
maintainable and easier to QA if it has only a single 'external'
hypervisor ABI to worry about - and that might as well be VMI. This is a
really obvious point, i expected the discussion to center more around
the specifics of such a move ;-)
Ingo
WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@elte.hu>
To: Zachary Amsden <zach@vmware.com>
Cc: Gerd Hoffmann <kraxel@suse.de>,
Jeremy Fitzhardinge <jeremy@goop.org>,
virtualization <virtualization@lists.osdl.org>,
Jan Beulich <jbeulich@novell.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Roland McGrath <roland@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: Xen & VMI?
Date: Tue, 6 Mar 2007 10:10:06 +0100 [thread overview]
Message-ID: <20070306091006.GA26073@elte.hu> (raw)
In-Reply-To: <45ED2E63.3070700@vmware.com>
* Zachary Amsden <zach@vmware.com> wrote:
> > > reduces the QA effort. You still have 5 Hypervisors you have to
> > > test against.
> >
> > yes, just like we have thousands of separate PC boards to support.
> > But as long as the basic ABI is the same, the QA effort on the Linux
> > kernel side is alot more focused. (Distros still have
> > 18446744073709551616 total combinations to QA, and have to make an
> > educated guess to reduce that to a more manageable number.)
>
> But hardware PC boards don't do anything as remotely complicate as
> changing the semantics required for correctness in you MMU
> implementation. [...]
ugh, PC boards are actually far worse and far more diverse than any
variances between hypervisors, but i digress.
anyway, my point stands: the Linux kernel is significantly more
maintainable and easier to QA if it has only a single 'external'
hypervisor ABI to worry about - and that might as well be VMI. This is a
really obvious point, i expected the discussion to center more around
the specifics of such a move ;-)
Ingo
next prev parent reply other threads:[~2007-03-06 9:10 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
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 [this message]
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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