Re: [PATCH] slow_map: minor improvements to ROM BAR handling

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On Tue, Dec 22, 2009 at 05:39:22PM +0200, Avi Kivity wrote:
> On 12/22/2009 05:36 PM, Alexander Graf wrote:
>>
>>> Is there a way to trap this and fprintf something?
>>>      
>> I don't think so. KVM will just trap on execution outside of RAM and
>> either fail badly or throw something bad into the guest. MMIO access
>> works by analyzing the instruction that accesses the MMIO address. That
>> just doesn't work when we don't have an instruction to analyze.
>>    
>
> We could certainly extend emulate.c to fetch instruction bytes from  
> userspace.  It uses ->read_std() now, so we'd need to switch to  
> ->read_emulated() and add appropriate buffering.

You mean run with KVM, and TCG will kick in when there's
an instruction we can't support natively?

> -- 
> error compiling committee.c: too many arguments to function
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