Re: [PATCH v4 2/9] migration: Implement switchover ack logic

[Peter Xu]

On Sun, May 28, 2023 at 05:06:45PM +0300, Avihai Horon wrote:
> Implement switchover ack logic. This prevents the source from stopping
> the VM and completing the migration until an ACK is received from the
> destination that it's OK to do so.
> 
> To achieve this, a new SaveVMHandlers handler switchover_ack_needed()
> and a new return path message MIG_RP_MSG_SWITCHOVER_ACK are added.
> 
> The switchover_ack_needed() handler is called during migration setup in
> the destination to check if switchover ack is used by the migrated
> device.
> 
> When switchover is approved by all migrated devices in the destination
> that support this capability, the MIG_RP_MSG_SWITCHOVER_ACK return path
> message is sent to the source to notify it that it's OK to do
> switchover.
> 
> Signed-off-by: Avihai Horon <avihaih@nvidia.com>

Reviewed-by: Peter Xu <peterx@redhat.com>

-- 
Peter Xu