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Re: [PATCH] tools/libxenguest: Fix migration's debug option

  • To: Olaf Hering <olaf@xxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Mon, 5 Jul 2021 11:19:59 +0200
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Mon, 05 Jul 2021 09:20:06 +0000
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On 05.07.2021 10:32, Olaf Hering wrote:
> Am Mon, 5 Jul 2021 10:23:00 +0200
> schrieb Jan Beulich <jbeulich@xxxxxxxx>:
>> I see. A similar problem then exists with at least the FIFO event
>> channel per-vCPU control blocks?
> I have not done any debugging how the pages differ and what they are actually 
> used for.
> My guess was that it might be activity from the backends, particularly
> netback. I found no API to query the usage of a page, so I declared the
> interface broken..

"The interface" being which one? The tool stack can map the guest's
grant table, so it is in the position to find out about all grants
without further hypervisor help. Afaict the same isn't true for the
FIFO event channel control blocks, though, and maybe there are
further ways by which pages may get modified for a paused guest.




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