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Re: [Qemu-devel] page fault during ins
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From: |
Benjamin Herrenschmidt |
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Subject: |
Re: [Qemu-devel] page fault during ins |
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Date: |
Thu, 23 Dec 2004 09:45:41 +0100 |
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.