[libvirt] [PATCH v2 01/15] Add event and state details for post-copy

[Daniel P. Berrange]

On Thu, Jan 21, 2016 at 11:20:46AM +0100, Jiri Denemark wrote:
> VIR_DOMAIN_EVENT_SUSPENDED_POSTCOPY and VIR_DOMAIN_PAUSED_POSTCOPY are
> used on the source host once migration enters post-copy mode (which
> means the domain gets paused on the source. After the destination host
> takes over the execution of the domain, its virtual CPUs are resumed and
> the domain enters VIR_DOMAIN_RUNNING_POSTCOPY state and
> VIR_DOMAIN_EVENT_RESUMED_POSTCOPY event is emitted.
> 
> In case migration fails during post-copy mode and none of the hosts have
> complete state of the domain, both domains will remain paused with
> VIR_DOMAIN_PAUSED_POSTCOPY_FAILED reason and an upper layer may decide
> what to do.
> 
> Signed-off-by: Jiri Denemark <jdenemar at redhat.com>

> @@ -2380,6 +2383,8 @@ typedef enum {
>      VIR_DOMAIN_EVENT_SUSPENDED_RESTORED = 4,  /* Restored from paused state file */
>      VIR_DOMAIN_EVENT_SUSPENDED_FROM_SNAPSHOT = 5, /* Restored from paused snapshot */
>      VIR_DOMAIN_EVENT_SUSPENDED_API_ERROR = 6, /* suspended after failure during libvirt API call */
> +    VIR_DOMAIN_EVENT_SUSPENDED_POSTCOPY = 7, /* suspended for post-copy migration */
> +    VIR_DOMAIN_EVENT_SUSPENDED_POSTCOPY_FAILED = 8, /* suspended after failed post-copy */

Presumably the POSTCOPY_FAILED event can only be emitted
on the target, since the source will already be suspended
when we see a failure, and it doesn't make sense to issue
a suspended event when we're already suspended.

ACK

Regards,
Daniel
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