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Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel

From Olaf Hering <olaf@aepfle.de>
Newsgroups linux.kernel
Subject Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel
Date 2016-12-15 11:40 +0100
Message-ID <sOBC9-4DI-7@gated-at.bofh.it> (permalink)
References <sLGf0-6eS-33@gated-at.bofh.it> <sOBC9-4DI-1@gated-at.bofh.it> <sOBC9-4DI-9@gated-at.bofh.it>
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On Thu, Dec 15, Olaf Hering wrote:

> On Thu, Dec 15, Vitaly Kuznetsov wrote:
> 
> > I see a number of minor but at least one major issue against such move:
> > At least for some Hyper-V versions (2012R2 for example)
> > CHANNELMSG_UNLOAD_RESPONSE is delivered to the CPU which initially sent 
> > CHANNELMSG_REQUESTOFFERS and on kdump we may not have this CPU up as
> > we usually do kdump with nr_cpus=1 (and on the CPU which crashed). 
> 
> Since the kdump or kexec kernel will send the unload during boot I would
> expect the response to arrive where it was sent, independent from the
> number of cpus.

Wait, I just noticed that "REQUESTOFFERS" now. That might be a reason
why my suggestion will not work.

Olaf

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Thread

Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-12-15 11:40 +0100
  Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Olaf Hering <olaf@aepfle.de> - 2016-12-15 11:40 +0100
    Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Olaf Hering <olaf@aepfle.de> - 2016-12-15 11:40 +0100
      Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-12-15 12:00 +0100
    Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-12-15 12:00 +0100
      Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Olaf Hering <olaf@aepfle.de> - 2016-12-15 14:00 +0100
        Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-12-15 14:30 +0100
          Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Olaf Hering <olaf@aepfle.de> - 2016-12-15 15:00 +0100
            Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Vitaly Kuznetsov <vkuznets@redhat.com> - 2016-12-15 15:40 +0100
              RE: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel KY Srinivasan <kys@microsoft.com> - 2016-12-16 02:00 +0100
          Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Olaf Hering <olaf@aepfle.de> - 2016-12-15 16:20 +0100

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