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

[Alexander Graf]

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