Am 25.05.2013 19:24, schrieb Alexandre DERUMIER:
You have:
pc-i440fx-1.4 Standard PC (i440FX + PIIX, 1996)
and
pc-q35-1.4 Standard PC (Q35 + ICH9, 2009)
Yes, q35 is not yet ready, but in the future (maybe next year), it should
become the default.
It's emulated pci-express slots and new things.
I think the correct way would be:
1.) always pass the -machine parameter so we "know" our default
2.) save the current machine parameter in config
3.) when creating a snapshot save this value too
I think for snapshot, indeed we should save qemu version.
Mhm qemu version. You mean the result form kvm_version() ? Remember that
the version might have changed from starting the vm to the snapshot point.
Same problem occours if we have a running VM (qemu 1.4) and we migrate
this one to another server running 1.X. We also need to set the machine
parameter here.
For live migration, I think we can detect with qmp the qemu version, the pass
the parameter to the target vm.
(So it can work with existing vm configs, and we don't need to update the
config file when we update qemu).
Maybe this should be optionnal, because I like to use live migrate to update to
new qemu version, without restarting the vm.
I personnaly never have had problem with live migration from lower to higher
qemu version.
To me this works for 1.4 to 1.4.3 and i use it in that case too. But for
1.3 to 1.4 or 1.4 to 1.5 it seems to fail by 20% for me. So there is no
guarantee that it works. I think stop and start is the safer way to go here.
Greets,
Stefan
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