2021年3月9日(火) 0:17 Stefan Hajnoczi <stefa...@redhat.com>: > > The live migration compatibility issue is still present. Migrating to > another host might not work if the block limits are different. > > Here is an idea for solving it: > > Modify include/hw/block/block.h:DEFINE_BLOCK_PROPERTIES_BASE() to > support a new value called "host". The default behavior remains > unchanged for live migration compatibility but now you can use "host" if > you know it's okay but don't care about migration compatibility. > > The downside to this approach is that users must explicitly say > something like --drive ...,opt_io_size=host. But it's still better than > the situation we have today where user must manually enter values for > their disk. > > Does this sound okay to everyone? > > Stefan
I wonder how that change affects other block drivers implementing bdrv_probe_blocksizes. As far as I know, the values they report are already used by default, which is contrary to the default not being "host". Regards, Akihiko Odaki
