[Qemu-devel] Re: [PATCH 0/2] Fix rtl8139 migration with hotplug

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Dec 16, 2010 at 11:01:49AM -0700, Alex Williamson wrote:
> Ok, I think this might actually make everyone happy, but I've been
> known to be wrong about that many times before.  Juan challenged me
> to find an rtl8139 migration scenario that fails when hotplug is
> not involved (and not switch device creation order since that's a
> usage bug).  I couldn't come up with one.  We had been arguing that
> a subsection didn't make sense for the change to rtl8139 vmstate
> because the needed function would be {return 1}. but what if we
> could detect if the VM had done any other hotplugs and only include
> the subsection in those cases.  That's what this short series does.
> 
> So, I hope Juan is happy because this preserves the migration ABI
> for the majority of the use cases, and I hope Michael is happy
> because it does so using a subsection.  Thanks,
> 
> Alex

I think it's a clever hack.

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
> 
> Alex Williamson (2):
>       rtl8139: Use subsection to restrict migration after hotplug
>       qdev: Track runtime machine modifications
> 
> 
>  hw/qdev.c    |   10 ++++++++++
>  hw/qdev.h    |    1 +
>  hw/rtl8139.c |   28 +++++++++++++++++++++++++++-
>  3 files changed, 38 insertions(+), 1 deletions(-)