On Mon, 04/27 18:28, Paolo Bonzini wrote: > When the dirty log mask will also cover other bits than DIRTY_MEMORY_VGA, > some listeners may be interested in the overall zero/non-zero value of > the dirty log mask; others may be interested in the value of single bits. > > For this reason, always call log_start/log_stop if bits have respectively > appeared or disappeared, and pass the old and new values of the dirty log > mask so that listeners can distinguish the kinds of change. > > For example, KVM checks if dirty logging used to be completely disabled > (in log_start) or is now completely disabled (in log_stop). On the > other hand, Xen has to check manually if DIRTY_MEMORY_VGA changed, > since that is the only bit it cares about. > > Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Reviewed-by: Fam Zheng <f...@redhat.com>
