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Re: [libvirt] [PATCH 0/2 v3 use qemu's dump-guest-meory when vm uses host device



On Thu, Apr 19, 2012 at 09:03:16AM +0800, Wen Congyang wrote:
> Currently, we use migrate to dump guest's memory. There is one
> restriction in migrate command: the device's status should be
> stored in qemu because the device's status should be passed to
> target machine.
> 
> If we passthrough a host device to guest, the device's status
> is stored in the real device. So migrate command will fail.
> 
> We usually use dump when guest is panicked. So there is no need
> to store device's status in the vmcore.
> 
> qemu will have a new monitor command dump-guest-memory to dump
> guest memory, but it doesn't support async now(it will support
> later when the common async API is implemented).
> 
> So I use dump-guest-memory only when the guest uses host device
> in this patchset.

Hmm, doesn't the new command generate dump files in a totally
different format to the existing command ?  If so I don't
think it is nice behaviour to silently switch between 2 different
dump formats depending on the XML config.  I think we'd want some
kind of flag to specify what format is desired.

Daniel
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