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

[Jordan Justen <jljusten@gmail.com>]

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Alex,

Well it was write-only before, so I don't see any harm in keeping it that
> way. Or am I mistaken there?
>

As I noted, I have seen it be read/write on real systems.  But, for qemu it
was previously write-only and ignored.

-Jordan

On Mon, Jun 29, 2009 at 11:46 AM, Alexander Graf <agraf@suse.de> wrote:

>
> On 29.06.2009, at 20:39, 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.
>>  Is it per-cpu?  If it's write only, then it doesn't need to be persisted in
>> savevm.
>>
>> I'd lean toward write-only unless there was a compelling reason to make it
>> read/write.
>>
>
> Well it was write-only before, so I don't see any harm in keeping it that
> way. Or am I mistaken there?
>
> Alex
>
>

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