linux-kernel - RE: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel

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Date:   Wed, 7 Dec 2016 18:11:04 +0000
From:   KY Srinivasan <kys@...rosoft.com>
To:     Olaf Hering <olaf@...fle.de>
CC:     "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: RE: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel



> -----Original Message-----
> From: Olaf Hering [mailto:olaf@...fle.de]
> Sent: Wednesday, December 7, 2016 8:40 AM
> To: KY Srinivasan <kys@...rosoft.com>
> Cc: vkuznets@...hat.com; gregkh@...uxfoundation.org; linux-
> kernel@...r.kernel.org; devel@...uxdriverproject.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