On Thu, Apr 26, 2012 at 03:49:25PM +0200, Christian Borntraeger wrote: > From: Einar Lueck <elelu...@de.ibm.com> > > This patch provides a new function to guess physical and logical block > sizes and exploits them in the context of s390 virtio bus. On s390 > there may be block sizes different then 512. Therefore, we will > use the new function to setup the physical and logical block size > properly. > > The alternative would be to do that unconditionally. There is also > a similar approach (only the sector size) at > https://github.com/bonzini/qemu/commit/d55b867fb6327d365c89effb7fc684459cdb26b6
The big problem with autosensing block sizes is that it breaks migration to hosts with a block device that has a different block size, or between files and block devices.
