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Re: [Qemu-devel] About qemu emulation speed (a question) and supported O

From: Anthony Liguori
Subject: Re: [Qemu-devel] About qemu emulation speed (a question) and supported OS
Date: Wed, 14 Sep 2005 13:46:58 -0500
User-agent: Mozilla Thunderbird 1.0.6 (X11/20050912)

Jim C. Brown wrote:

On Tue, Sep 13, 2005 at 11:27:39PM -0500, Anthony Liguori wrote:
I reckon kqemu has this same problem... Technically, even in ring 3, if you run natively, you violate the Popek/Goldberg requirements because of cpuid. It's just not possible to trap it but it shouldn't matter for most software.

It is possible to trap it, in a sense. You just read ahead and replace the
cpuid instruction with something else.
You can't readahead beyond a basic block. Taking a trap for each basic block and translating the block is what QEMU does.


Anthony Liguori

Ugly, but doable.

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