changes since v2:
Patch 1 - a) add new element qcow2 as drive's child, if any qcow2
             specific configuration exists.
          b) merge the three test cases to one.
          c) update docs. cache size only support bytes.
          d) move the parameters checking to virDomainDiskDefParseValidate 

Patch 2 - a) use QMP instead of qemu version to identify qemu capabilities.
          b) change capablity names with prefix drive.qcow2.
          c) merge the three test cases to one.

Liu Qing (2):
  conf, docs: Add qcow2 cache configuration support
  qemu: add capability checking for qcow2 cache configuration

 docs/formatdomain.html.in                          | 43 ++++++++++
 docs/schemas/domaincommon.rng                      | 35 ++++++++
 src/conf/domain_conf.c                             | 95 +++++++++++++++++++++-
 src/qemu/qemu_capabilities.c                       |  9 ++
 src/qemu/qemu_capabilities.h                       |  3 +
 src/qemu/qemu_command.c                            | 33 ++++++++
 src/util/virstoragefile.c                          |  3 +
 src/util/virstoragefile.h                          |  6 ++
 tests/qemucapabilitiesdata/caps_2.5.0.x86_64.xml   |  3 +
 .../caps_2.6.0-gicv2.aarch64.xml                   |  3 +
 .../caps_2.6.0-gicv3.aarch64.xml                   |  3 +
 tests/qemucapabilitiesdata/caps_2.6.0.ppc64le.xml  |  3 +
 tests/qemucapabilitiesdata/caps_2.6.0.x86_64.xml   |  3 +
 tests/qemucapabilitiesdata/caps_2.7.0.s390x.xml    |  3 +
 tests/qemucapabilitiesdata/caps_2.7.0.x86_64.xml   |  3 +
 tests/qemucapabilitiesdata/caps_2.8.0.s390x.xml    |  3 +
 tests/qemucapabilitiesdata/caps_2.8.0.x86_64.xml   |  3 +
 tests/qemucapabilitiesdata/caps_2.9.0.ppc64le.xml  |  3 +
 tests/qemucapabilitiesdata/caps_2.9.0.s390x.xml    |  3 +
 tests/qemucapabilitiesdata/caps_2.9.0.x86_64.xml   |  3 +
 .../qemuxml2argv-disk-drive-qcow2-cache.args       | 28 +++++++
 .../qemuxml2argv-disk-drive-qcow2-cache.xml        | 43 ++++++++++
 tests/qemuxml2argvtest.c                           |  4 +
 .../qemuxml2xmlout-disk-drive-qcow2-cache.xml      | 43 ++++++++++
 tests/qemuxml2xmltest.c                            |  1 +
 25 files changed, 381 insertions(+), 1 deletion(-)
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-cache.args
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-cache.xml
 create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-cache.xml

-- 
1.8.3.1

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