Re: [PATCH v6 0/9] Clock framework API

[Dr. David Alan Gilbert]

* Cleber Rosa (address@hidden) wrote:
> On Thu, Dec 05, 2019 at 12:01:56PM +0100, Philippe Mathieu-Daudé wrote:
> > 
> > Understood, thanks for clearing this out!
> > 
> > Side note, we don't do cross-arch migration testing, but we talked about
> > having a 'different QEMU version' migration test. When we get a such test
> > setup, it shouldn't be too difficult to evolve to some cross-arch migration
> > test.
> >
> 
> +Oksana,
> 
> Avocado-VT has had this as a core concept as far as I can remember, and
> it's exposed even as a command line argument:
> 
>    avocado run --help
>    ...
>    [--vt-qemu-dst-bin VT_DST_QEMU_BIN]
>    ...
> 

Yeh, I've run that in the past - it works OK.

Dave

> Oksana is currently working on new migration test cases, and may consider
> looking into adding "different QEMU version" support too.
> 
> PS: I have to say, though, that I'm trying to get my mind around
> cross-arch migration being real.
> 
> - Cleber.
> 
> > > > I hope I'm wrong and confuse, this is a great news for me to know we
> > > > can migrate floats!
> > > > 
> > > > > Dave
> > > > > 
> > > > > > > So we could store the frequency in clock out and migrate things 
> > > > > > > there.
> > > > > > > But since we have no way to ensure all clock out states are 
> > > > > > > migrated
> > > > > > > before some device fetch a ClockIn: we'll have to say "don't 
> > > > > > > fetch one
> > > > > > > of your ClockIn frequency during migration and migrate the value
> > > > > > > yourself if you need it", pretty much like gpios.
> > > > > > > 
> > > > > > > So we will probably migrate all ClockOut and almost all ClockIn.
> > > > > > > 
> > > > > > > It would nice if we had a way to ensure clocks are migrated before
> > > > > > > devices try to use them. But I don't think this is possible.
> > > > > > > 
> > > > > > > --
> > > > > > > Damien
> > > > > > > 
> > > > > > 
> > > > > --
> > > > > Dr. David Alan Gilbert / address@hidden / Manchester, UK
> > > > > 
> > > > 
> > > --
> > > Dr. David Alan Gilbert / address@hidden / Manchester, UK
> > > 
> > 
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK