I did some further testing and it appears that QEMU is reading the flags as base-10 which causes issues. I'll need to make some tweaks and release a v3 of the patches later today.

Please ignore this set. 

On Fri, Oct 2, 2020, 11:55 AM Brian Turek <brian.turek@gmail.com> wrote:
This second version of the patch incorporates Peter Krempa's feedback
by tweaking a few things in the code and, more importantly, splitting
up the singular large patch into smaller patches.

Brian Turek (4):
  qemu: capabilities: add QEMU_CAPS_FSDEV_CREATEMODE
  qemu: add support for 'fmode' and 'dmode' options
  qemu: add schema 'fmode' and 'dmode' options
  qemu: add docs for 'fmode' and 'dmode' options

 docs/formatdomain.rst                         | 12 ++++
 docs/schemas/domaincommon.rng                 | 16 +++++
 src/conf/domain_conf.c                        | 27 ++++++++
 src/conf/domain_conf.h                        |  2 +
 src/qemu/qemu_capabilities.c                  |  2 +
 src/qemu/qemu_capabilities.h                  |  1 +
 src/qemu/qemu_command.c                       |  6 ++
 src/qemu/qemu_validate.c                      | 18 ++++++
 .../caps_2.10.0.aarch64.xml                   |  1 +
 .../caps_2.10.0.ppc64.xml                     |  1 +
 .../caps_2.10.0.s390x.xml                     |  1 +
 .../caps_2.10.0.x86_64.xml                    |  1 +
 .../caps_2.11.0.s390x.xml                     |  1 +
 .../caps_2.11.0.x86_64.xml                    |  1 +
 .../caps_2.12.0.aarch64.xml                   |  1 +
 .../caps_2.12.0.ppc64.xml                     |  1 +
 .../caps_2.12.0.s390x.xml                     |  1 +
 .../caps_2.12.0.x86_64.xml                    |  1 +
 .../qemucapabilitiesdata/caps_3.0.0.ppc64.xml |  1 +
 .../caps_3.0.0.riscv32.xml                    |  1 +
 .../caps_3.0.0.riscv64.xml                    |  1 +
 .../qemucapabilitiesdata/caps_3.0.0.s390x.xml |  1 +
 .../caps_3.0.0.x86_64.xml                     |  1 +
 .../qemucapabilitiesdata/caps_3.1.0.ppc64.xml |  1 +
 .../caps_3.1.0.x86_64.xml                     |  1 +
 .../caps_4.0.0.aarch64.xml                    |  1 +
 .../qemucapabilitiesdata/caps_4.0.0.ppc64.xml |  1 +
 .../caps_4.0.0.riscv32.xml                    |  1 +
 .../caps_4.0.0.riscv64.xml                    |  1 +
 .../qemucapabilitiesdata/caps_4.0.0.s390x.xml |  1 +
 .../caps_4.0.0.x86_64.xml                     |  1 +
 .../caps_4.1.0.x86_64.xml                     |  1 +
 .../caps_4.2.0.aarch64.xml                    |  1 +
 .../qemucapabilitiesdata/caps_4.2.0.ppc64.xml |  1 +
 .../qemucapabilitiesdata/caps_4.2.0.s390x.xml |  1 +
 .../caps_4.2.0.x86_64.xml                     |  1 +
 .../caps_5.0.0.aarch64.xml                    |  1 +
 .../qemucapabilitiesdata/caps_5.0.0.ppc64.xml |  1 +
 .../caps_5.0.0.riscv64.xml                    |  1 +
 .../caps_5.0.0.x86_64.xml                     |  1 +
 .../caps_5.1.0.x86_64.xml                     |  1 +
 .../caps_5.2.0.x86_64.xml                     |  1 +
 .../virtio-9p-createmode.x86_64-latest.args   | 45 ++++++++++++++
 .../qemuxml2argvdata/virtio-9p-createmode.xml | 58 ++++++++++++++++++
 .../virtio-9p-createmode.x86_64-latest.xml    | 61 +++++++++++++++++++
 tests/qemuxml2xmltest.c                       |  1 +
 46 files changed, 283 insertions(+)
 create mode 100644 tests/qemuxml2argvdata/virtio-9p-createmode.x86_64-latest.args
 create mode 100644 tests/qemuxml2argvdata/virtio-9p-createmode.xml
 create mode 100644 tests/qemuxml2xmloutdata/virtio-9p-createmode.x86_64-latest.xml

--
2.25.1