From: ebiederm@xmission.com (Eric W. Biederman)
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Len Brown <lenb@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Xen-devel <xen-devel@lists.xensource.com>
Subject: Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's no local APIC
Date: Thu, 18 Jun 2009 12:27:39 -0700 [thread overview]
Message-ID: <m1zlc5jqac.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <4A3A9220.4070807@goop.org> (Jeremy Fitzhardinge's message of "Thu\, 18 Jun 2009 12\:14\:40 -0700")
Jeremy Fitzhardinge <jeremy@goop.org> writes:
> On 06/18/09 09:08, Len Brown wrote:
>>> In principle, the local APIC and the I/O APIC are distinct (but related)
>>> components, which can be independently present.
>>>
>>
>> bzzzzt, but thanks for playing:-)
>>
>
> Perhaps I should have expressed that a bit more clearly: you could, if
> mad, build a machine with I/O APICs and some other mechanism for
> delivering the interrupts to CPUs. In practice, I doubt anyone ever
> has, or ever would.
>
> The only actual exception I know of is Xen's replacement of the physical
> local APIC with a paravirtualized interrupt interface.
No one ever has. Xen doesn't have I/O APICs either. Not in any real
sense. Xen just has devices that looking like I/O apics if you don't
look close.
Eric
next prev parent reply other threads:[~2009-06-18 19:27 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-12 18:22 [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's no local APIC Jeremy Fitzhardinge
2009-06-12 18:22 ` Jeremy Fitzhardinge
2009-06-12 18:28 ` Alan Cox
2009-06-12 18:28 ` Alan Cox
2009-06-12 18:33 ` Jeremy Fitzhardinge
2009-06-12 18:33 ` Jeremy Fitzhardinge
2009-06-12 20:11 ` Cyrill Gorcunov
2009-06-15 2:01 ` Jeremy Fitzhardinge
2009-06-12 20:35 ` Eric W. Biederman
2009-06-12 20:35 ` Eric W. Biederman
2009-06-15 2:06 ` Jeremy Fitzhardinge
2009-06-15 10:47 ` Eric W. Biederman
2009-06-15 10:47 ` Eric W. Biederman
2009-06-15 20:49 ` Jeremy Fitzhardinge
2009-06-15 20:49 ` Jeremy Fitzhardinge
2009-06-15 21:58 ` Eric W. Biederman
2009-06-15 21:58 ` Eric W. Biederman
2009-06-16 19:38 ` Jeremy Fitzhardinge
2009-06-16 19:38 ` Jeremy Fitzhardinge
2009-06-17 5:10 ` Eric W. Biederman
2009-06-17 5:10 ` Eric W. Biederman
2009-06-17 12:02 ` Eric W. Biederman
2009-06-17 12:02 ` Eric W. Biederman
2009-06-17 17:32 ` Jeremy Fitzhardinge
2009-06-17 17:32 ` Jeremy Fitzhardinge
2009-06-18 2:58 ` Eric W. Biederman
2009-06-18 2:58 ` Eric W. Biederman
2009-06-18 19:34 ` Jeremy Fitzhardinge
2009-06-18 19:34 ` Jeremy Fitzhardinge
2009-06-18 20:28 ` Eric W. Biederman
2009-06-18 21:09 ` Jeremy Fitzhardinge
2009-06-18 21:09 ` Jeremy Fitzhardinge
2009-06-19 1:38 ` Eric W. Biederman
2009-06-19 1:38 ` Eric W. Biederman
2009-06-19 3:10 ` [Xen-devel] " Jiang, Yunhong
2009-06-19 3:10 ` Jiang, Yunhong
2009-06-18 12:26 ` Eric W. Biederman
2009-06-15 10:51 ` Eric W. Biederman
2009-06-15 10:51 ` Eric W. Biederman
2009-06-18 16:08 ` Len Brown
2009-06-18 19:14 ` Jeremy Fitzhardinge
2009-06-18 19:14 ` Jeremy Fitzhardinge
2009-06-18 19:27 ` Eric W. Biederman [this message]
2009-06-18 19:48 ` Jeremy Fitzhardinge
2009-06-18 19:48 ` Jeremy Fitzhardinge
2009-06-18 20:39 ` Eric W. Biederman
2009-06-18 22:33 ` Jeremy Fitzhardinge
2009-06-18 22:33 ` Jeremy Fitzhardinge
2009-06-19 2:42 ` Eric W. Biederman
2009-06-19 2:42 ` Eric W. Biederman
2009-06-19 19:58 ` Jeremy Fitzhardinge
2009-06-19 19:58 ` Jeremy Fitzhardinge
2009-06-19 23:44 ` [Xen-devel] " Nakajima, Jun
2009-06-19 23:44 ` Nakajima, Jun
2009-06-20 7:39 ` [Xen-devel] " Keir Fraser
2009-06-20 7:39 ` Keir Fraser
2009-06-20 8:21 ` [Xen-devel] " Eric W. Biederman
2009-06-20 8:21 ` Eric W. Biederman
2009-06-20 8:57 ` [Xen-devel] " Tian, Kevin
2009-06-20 8:57 ` Tian, Kevin
2009-06-20 10:22 ` [Xen-devel] " Keir Fraser
2009-06-20 10:22 ` Keir Fraser
2009-06-20 8:18 ` [Xen-devel] " Eric W. Biederman
2009-06-20 8:18 ` Eric W. Biederman
2009-06-19 5:32 ` Yinghai Lu
2009-06-19 5:32 ` Yinghai Lu
2009-06-19 5:50 ` Eric W. Biederman
2009-06-19 5:50 ` Eric W. Biederman
2009-06-19 7:52 ` [Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs justbecause " Jan Beulich
2009-06-19 7:52 ` Jan Beulich
2009-06-19 8:16 ` [Xen-devel] " Eric W. Biederman
2009-06-19 8:16 ` Eric W. Biederman
2009-06-20 3:58 ` [Xen-devel] " Yinghai Lu
2009-06-20 3:58 ` Yinghai Lu
2009-06-20 5:40 ` [Xen-devel] " Eric W. Biederman
2009-06-20 5:40 ` Eric W. Biederman
2009-06-20 5:58 ` [Xen-devel] " Yinghai Lu
2009-06-20 5:58 ` Yinghai Lu
2009-06-18 22:51 ` [PATCH RFC] x86/acpi: don't ignore I/O APICs just because " Maciej W. Rozycki
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