Ping regarding this patch and the ones following it in the series. I
would very much appreciate any feedback on the new callback and related
plumbing I'm proposing for passing things like the guest block device
sector size to block drivers (such as the filter type one proposed
earlier in this
A block driver may need to know about the block configuration, most
critically the sector sizes, of a block backend for alignment purposes
or for some other reason. It doesn't seem like qemu has an existing
mechanism for a block backend to convey the required information to
the relevant block
