On Mi, 2014-04-23 at 09:32 +0000, Gonglei (Arei) wrote: > > > > Hi, Gerd and Juan. > > > > Thanks for your guides about the confuse live migration about changing the > > keyboard buffer size. > > According your suggestion, I got two solutions to address the issue: > > > > - Keep the data array 256 bytes long, change the rptr/wptr/count/data array > > at > > post_load(), both > > Ps/2 keyboard and mouse. This solution can be compatible with older qemu > > versions, which can > > do live migration each other. > > > > -Change the data array to 16 bytes, still save as PS2_QUEUE_SIZE. Reset the > > rptr/wptr/count at > > post_load(), both ps/2 keyboard and mouse. Add VMSTATE_UNUSED(256-16) in > > struct vmstate_ps2_common. > > This solution just save the 16 bytes buffer and drop the rest, So we can't > > migrate vm to older qemu versions. > > But migration from old qemu to new qemu is ok. > > > Sorry, the second solution also support cross-version live migration each > other.
But you loose anything in the buffer when migrating from old -> new. cheers, Gerd
