Re: [PATCH v4 0/1] hw/hyperv/vmbus: Is it maintained?

[Maciej S. Szmigiero]

On 12.11.2021 21:39, Roman Kagan wrote:
> On Fri, Nov 12, 2021 at 09:32:31PM +0300, Vladimir Sementsov-Ogievskiy wrote:
> > Add Den and Roman (his new address)
>
> Thanks, I missed it on the list indeed.
>
> > 06.11.2021 16:41, Philippe Mathieu-Daudé wrote:
> > > This is the 4th time I send this patch. Is the VMBus infrastructure
> > > used / maintained? Should we deprecate & remove?
>
> I think it's fair to say it's not maintained.  The whole
> hw/hyperv/vmbus.c was submitted as a part of the work by Jon to enable
> some obscure windows debugging feature which only worked in presence of
> VMBus.  It was mostly taken from the respective branch of the (now
> effectively abandoned) downstream tree with an implementation of the
> core VMBus infrastructure and the devices using it; however, none of the
> actual VMBus devices ever made it into the mainline tree.

The VMBus code works fine, is mostly self-contained and by being a part
of the upstream QEMU it does benefit from any improvements done there and
so it is much less likely to bit-rot with time.

I am still committed to upstreaming a Hyper-V Dynamic Memory Protocol
driver (which uses VMBus), however had been preempted by higher-priority
work for now.

Thanks,
Maciej