On Fri, Oct 26, 2018 at 01:28:54AM +0200, Paolo Bonzini wrote:

On 15/10/2018 11:27, Christoph Hellwig wrote:

quoted

There is some issues in this spec.  For one using the multiple ranges
also for write zeroes is rather inefficient.  Write zeroes really should
use the same format as read and write.

What makes it inefficient?

We require a memory allocation for each write zeroes instead of encoding
the lba/len in the command.