Re: [Qemu-devel] [RFC PATCH RDMA support v5: 03/12] comprehensive protocol documentation

[Paolo Bonzini]

Il 15/04/2013 15:24, Michael R. Hines ha scritto:
> Now, in this example, let's say the migration starts up and the hypervisor
> has run out of physical memory and starts swapping during the migration.
> (also for the sake of argument).
> 
> The next thing that would immediately happen is the
> next IB verbs function call: "ib_reg_mr()".
> 
> This function call would probably fail because there's nothing else left
> to pin and the function call would return an error.
> 
> So my question is: Is it not sufficient to send a message back to the
> primary-VM side of the connection which says:
> 
> "Your migration cannot proceed anymore, please resume the VM and try
> again somewhere else".
> 
> In this case, both the system administrator and the virtual machine are safe,
> nothing has been killed, nothing has crashed, and the management software
> can proceed to make a new management decision.
> 
> Is there something wrong with this sequence of events?

I think it's good enough.  "info migrate" will then report that
migration failed.

Paolo