Re: [Xen-devel] [PATCH v2 COLOPre 03/13] libxc/restore: zero ioreq page only one time

[Yang Hongyang <yanghy@xxxxxxxxxxxxxx>]

On 06/11/2015 06:20 PM, Paul Durrant wrote:
> > -----Original Message-----
> > From: Wen Congyang [mailto:wency@xxxxxxxxxxxxxx]
> > Sent: 11 June 2015 09:48
> > To: Paul Durrant; Andrew Cooper; Yang Hongyang; xen-devel@xxxxxxxxxxxxx
> > Cc: Wei Liu; Ian Campbell; guijianfeng@xxxxxxxxxxxxxx;
[...]
> > In our implementation, we don't start a new emulator. The codes can work,
> > but some bugs may be not triggered.
> How do you reconcile the incoming QEMU save record with the running emulator 
> state?
We introduce a qmp command "xen-load-devices-state"(libxl__qmp_restore) which
can restore the emulator state. The step of resotre emulator state at a
checkpoint is:

1. libxl__qmp_stop    -> vm_stop() in qemu
2. libxl__qmp_restore -> load_vmstate() in qemu
3. libxl__qmp_resume  -> vm_start() in qemu

>    Paul
>
> > Thanks
> > Wen Congyang
> >
> > >    Paul
> > >
> > > > Thanks
> > > > Wen Congyang
> > > >
> > > > >    Paul
> > > > >
> > > > > > We will set to the guest to a new state, the old state should be
> > dropped.
> > > > > > Thanks
> > > > > > Wen Congyang
> > > > > >
> > > > > > >    Paul
> > > > > > >
> > > > > > > > Thanks
> > > > > > > > Wen Congyang
> > > > > > > >
> > > > > > > > >    Paul
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > > Thanks
> > > > > > > > > > Wen Congyang
> > > > > > > > > >
> > > > > > > > > > > ~Andrew
> > > > > > > > > > > .
> > > > > > > > > .
> > > > > > > .
> > > > > >
> > > > > > _______________________________________________
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> > > > > .
> > > .
>
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> .
--
Thanks,
Yang.

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