Re: [Qemu-devel] [PATCH] Implement PC port80 debug register.

[Avi Kivity <avi@redhat.com>]

On 06/29/2009 09:39 PM, Anthony Liguori wrote:
> Avi Kivity wrote:
>>> I still think the read/write port route would
>>> * better emulate systems,
>>> * be more flexible (allowing software the option to read it),
>>> * and, be easier to implement :)
>>>
>>> But, I think the most important part is to make the data accessible 
>>> somehow.  So, the monitor access method would work fine as well.
>>
>> I don't object to read/write access.
>
> If there's read and write access, it needs to be part of the savevm 
> state. 

That's true even if it's write only, as long as it is observable somehow 
(in our case, from the monitor).

> Is it per-cpu?

No, it's a normal pci/isa card.

> I'd lean toward write-only unless there was a compelling reason to 
> make it read/write.

I can't say there's a compelling reason for that.

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