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

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Message-ID: <49E7B3EB.6060101@zytor.com>
Date:	Thu, 16 Apr 2009 15:40:43 -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:
> 
> We don't emulate guest user mode.
> 
> Well, if guest userspace can convince its kernel to give it access to 
> some memory mapped I/O register, I guess it can execute repeated 'mov 
> ss, mmio' and starve the guest kernel.
> 

It doesn't need a MMIO register to do that, even.

	-hpa
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