"Gonglei (Arei)" <arei.gong...@huawei.com> 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.
Second solution is better in the sense that it allows forward and backward migration. The first one only allows forward migration. Please use second one. Later, Juan. > >> I have tested the two solutions, but which one is better? Expect your reply. >> Thanks! >> > > Best regards, > -Gonglei
