From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: Avi Kivity <avi@qumranet.com>
Cc: kvm-devel@lists.sourceforge.net, glommer@gmail.com,
qemu-devel@nongnu.org, Glauber Costa <gcosta@redhat.com>
Subject: [Qemu-devel] Re: [PATCH] ignore reads to the EOI register.
Date: Thu, 27 Mar 2008 11:29:36 +0000 (GMT) [thread overview]
Message-ID: <alpine.SOC.1.00.0803271122100.29238@piorun> (raw)
In-Reply-To: <47EB586E.3090002@qumranet.com>
On Thu, 27 Mar 2008, Avi Kivity wrote:
> Applied, but perhaps a patch to linux to avoid reads to write-only registers
> is needed as well.
Linux performs reads to all registers written including this one
deliberately using an RMW cycle to avoid triggering an erratum in some
early Pentium integrated APICs. Obviously it does not matter for most of
the world as the workaround is build-time conditional, but you'll get it
if you build a generic "runs everywhere" kernel.
Maciej
next prev parent reply other threads:[~2008-03-27 11:31 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-27 0:57 [Qemu-devel] [PATCH] ignore reads to the EOI register Glauber Costa
2008-03-27 8:18 ` [Qemu-devel] " Avi Kivity
2008-03-27 11:29 ` Maciej W. Rozycki [this message]
[not found] ` <87hcesjpqa.fsf@basil.nowhere.org>
2008-03-27 12:55 ` Avi Kivity
2008-03-27 13:36 ` Maciej W. Rozycki
2008-03-27 23:39 ` [Qemu-devel] " Aurelien Jarno
2008-03-28 12:59 ` Glauber Costa
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