From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Piotras <piotras@gmail.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] page fault during ins
Date: Thu, 23 Dec 2004 09:45:41 +0100 [thread overview]
Message-ID: <1103791541.29993.18.camel@gaston> (raw)
In-Reply-To: <da6318370412150017381bfcc2@mail.gmail.com>
On Wed, 2004-12-15 at 09:17 +0100, Piotras wrote:
> Do we have any device where iomem read changes device state?
> Wouldn't such hardware cause problems with speculative execution
> (memory reads) on some real CPUs? Or am I missing something?
This is still quit common unfortunately...
On archs like ppc, this is why IO space is marked "Guarded" to prevent
speculation.
Ben.
next prev parent reply other threads:[~2004-12-23 9:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-13 14:52 [Qemu-devel] page fault during ins Piotras
2004-12-14 21:40 ` Fabrice Bellard
2004-12-14 22:29 ` malc
2004-12-15 8:17 ` Piotras
2004-12-17 0:07 ` Mark Williamson
2004-12-23 8:45 ` Benjamin Herrenschmidt [this message]
2004-12-15 8:22 ` Piotras
-- strict thread matches above, loose matches on Subject: below --
2004-12-15 18:36 Juergen Keil
2004-12-15 20:07 ` Piotras
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