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

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Message-ID: <49EAE035.6000908@redhat.com>
Date:	Sun, 19 Apr 2009 11:26:29 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.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

H. Peter Anvin wrote:
> 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.
>

Can you explain how?

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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