On Tue, Apr 23, 2013 at 7:22 PM, Eric Blake <ebl...@redhat.com> wrote: > On 04/23/2013 11:12 AM, Wolfgang Richter wrote: >> I'm interested in adding introspection of disk writes to QEMU for various >> applications and research potential. >> >> What I mean by introspection of disk writes is that, when enabled, each >> write >> passing through QEMU to backing storage would also be copied to an >> introspection channel for further analysis. > > Sounds like you would be benefited by the block-backup series, with an > NBD server as the point where you inject your introspection. > > https://lists.gnu.org/archive/html/qemu-devel/2013-04/msg04629.html > > The existing drive-mirror command can also target an NBD destination, > with similar effects.
One adjustment needs to be made: do not update the backup bitmap. This allows you to continue "tapping" guest writes even if they rewrite the same disk sectors. Stefan
