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Rework tracking of original VM properties for migration and stateful snapshots/stop - #3181
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Signed-off-by: Stéphane Graber <stgraber@stgraber.org>
Signed-off-by: Stéphane Graber <stgraber@stgraber.org>
Signed-off-by: Stéphane Graber <stgraber@stgraber.org>
Signed-off-by: Stéphane Graber <stgraber@stgraber.org>
Signed-off-by: Stéphane Graber <stgraber@stgraber.org>
Signed-off-by: Stéphane Graber <stgraber@stgraber.org>
Signed-off-by: Stéphane Graber <stgraber@stgraber.org>
bensmrs
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bensmrs
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LGTM. A few points I don’t fully get.
| func (d *qemu) getBootState() (*qemuBootState, error) { | ||
| // Prepare a new state struct. | ||
| bs := qemuBootState{ | ||
| Version: -1, |
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Why -1 instead of 0 if the first “new” version is 1?
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The thought behind -1 and skipping 0 was that -1 would clearly detect any scenario where we didn't unpack an actual state struct from JSON but instead used the fallback logic.
Avoiding 0 was to avoid accidents as an uninitialized struct would have the field default to 0.
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| // Record the QEMU machine definition. | ||
| if !stateful { | ||
| if !stateful && d.CanLiveMigrate() { |
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Why the new guard? To avoid computing useless things?
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Yeah, exactly, the machine type is only ever used during live migration or stateful snapshot restore (unlike some of the other bits of the boot state that we access in other functions during startup), so we can save ourselves a QMP roundtrip on systems where migration isn't useful.
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