move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel

[KY Srinivasan]

> -----Original Message-----
> From: Olaf Hering [mailto:olaf at aepfle.de]
> Sent: Wednesday, December 7, 2016 8:40 AM
> To: KY Srinivasan <kys at microsoft.com>
> Cc: vkuznets at redhat.com; gregkh at linuxfoundation.org; linux-
> kernel at vger.kernel.org; devel at linuxdriverproject.org
> Subject: Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to
> kdump kernel
> 
> On Wed, Dec 07, KY Srinivasan wrote:
> 
> > May be a better solution might be to have a new mechanism to indicate
> > to the host that all state of the previous incarnation of the kernel
> > needs to be cleaned up.  This will be close to what we have on
> > hardware.
> 
> That would be cool, but until this appears and until its deployed in
> Azure and elsewhere I will likely lose the remaining hairs.

I think the code we have upstream works; I have not seen any issues reported.
I will try to get the host guys to implement this - hopefully it won't be too late!

K. Y
> 
> Olaf