Re: [libvirt] Transitioning from HMP to QMP for QEMU

On 2011-12-15 14:02, Stefan Hajnoczi wrote: > What is the status of QEMU's transition from HMP to the QMP interface? > > My current understanding is that QEMU provides new HMP commands for > humans, but HMP is being phased out as an API. Management tools > should rely only on QMP for new commands. That would mean new HMP > commands are not guaranteed to produce backwards-compatible output > because tools are not supposed to parse the output. > > On the libvirt side, new QEMU features should only be supported via > the json monitor in the future (i.e. human monitor patches should not > be sent/merged)? Existing HMP commands will still need the human > monitor support in order to handle old QEMU versions gracefully, but > I'm thinking about new commands only. > > Does everyone agree on this? I think this is an important discussion > if we want our management interface to get better and more consistent > in the future. To phase out the classic HMP implementation, we need an internal HMP-over-JSON wrapper (with tab expansion etc.) so that virtual console and gdbstub monitors continue to benefit from new commands. Those interfaces will stay for a long time, I'm sure.