linux-kernel - Re: [PATCH] deal with interrupt shadow state for emulated instruction

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Date:	Tue, 14 Apr 2009 09:25:13 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Glauber Costa <glommer@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] deal with interrupt shadow state for emulated instruction

Avi Kivity wrote:
> 
> Why do we care?  The guest can only harm itself, and if it wants to
> disable interrupts, it would be a lot easier for it to run a plain 'cli'.
> 
> I guess it would be a problem if we emulated 'mov ss' for ordinary
> userspace or vm86 mode, but we don't.
> 

Well, the answer is that mov ss is an unprivileged instruction.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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