See:
https://lists.gnu.org/archive/html/qemu-devel/2012-07/msg03747.html
Related do RHBZ#1130506.
Maros Zatko (1):
api: add_drive - add QEMU detect-zeroes support
generator/actions.ml | 2 +-
src/drives.c | 11 +++++++++--
src/guestfs-internal.h | 1 +
src/launch-direct.c | 8 +++++---
4 files changed, 16 insertions(+), 6 deletions(-)
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1.9.3