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

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Message-ID: <49DDA69F.9040808@redhat.com>
Date:	Thu, 09 Apr 2009 10:41:19 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Glauber Costa <glommer@...hat.com>
CC:	"H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] disable interrupt shadow state for emulated instruction

Glauber Costa wrote:
>> How does this logic work when the instruction emulated is an STI or MOV  
>> SS instruction?  In particular, when does GUEST_INTERRUPTIBILITY_INFO  
>> sets set to reflect the *blocking* operation?
>>     
> mov ss is a non-issue, since it is executed natively.
>   

Except in big real mode (needs emulate_invalid_guest_state = 1).

> As for sti, I'm not sure. I see code for emulating sti, but in my testings,
> this code was never ever touched, under a number of different scenarios.
> Avi, can you clarify if sti can be in fact emulated, and under which
> circunstamces? 
>   

big real mode only.



-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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