[libvirt] [PATCH 0/2] Add support for zero-write detection

[Martin Kletzander]

QEMU supports detect-zeroes option since version 2.1, but we never
added support for it in libvirt.  If was requested by Vasiliy Tolstov
in the list, so I just added it.

There are two discussions to be had, optionally.  One is to decide
whether we should disable detect_zeros='unmap' if discard is not set
to 'unmap', but this is getting very hypervisor-specific, so I just
documented the behaviour.  The other one is the naming.  I described
why I made the decision for "zeros" instead of "zeroes" the decision
in the patch, but I have no problem changing it to what others like
better.


Martin Kletzander (2):
  conf: Add support of zero-detection for disks
  qemu: Add support for zero-detection writes

 docs/formatdomain.html.in                          | 10 ++++++
 docs/schemas/domaincommon.rng                      | 12 +++++++
 src/conf/domain_conf.c                             | 23 +++++++++++++-
 src/conf/domain_conf.h                             | 11 +++++++
 src/libvirt_private.syms                           |  2 ++
 src/qemu/qemu_capabilities.c                       |  2 ++
 src/qemu/qemu_capabilities.h                       |  1 +
 src/qemu/qemu_command.c                            | 11 +++++++
 tests/qemucapabilitiesdata/caps_2.1.1-1.caps       |  1 +
 tests/qemucapabilitiesdata/caps_2.4.0-1.caps       |  1 +
 tests/qemucapabilitiesdata/caps_2.5.0-1.caps       |  1 +
 .../qemuxml2argv-disk-drive-detect-zeros.args      | 27 ++++++++++++++++
 .../qemuxml2argv-disk-drive-detect-zeros.xml       | 37 ++++++++++++++++++++++
 tests/qemuxml2argvtest.c                           |  4 +++
 tests/qemuxml2xmltest.c                            |  1 +
 15 files changed, 143 insertions(+), 1 deletion(-)
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-detect-zeros.args
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-detect-zeros.xml

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2.6.4