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Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU |
Date: |
Thu, 15 Dec 2011 14:33:40 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111115 Thunderbird/8.0 |
Am 15.12.2011 14:18, schrieb Jan Kiszka:
> 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.
I think we're not talking about dropping HMP here, only about how long
to support it as a stable API for management tools. I believe that we
have been in a transitional phase for long enough now that we can start
changing the output format of HMP commands without considering it an API
breakage.
Kevin
- [Qemu-devel] Transitioning from HMP to QMP for QEMU, Stefan Hajnoczi, 2011/12/15
- Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU, Jan Kiszka, 2011/12/15
- Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU,
Kevin Wolf <=
- Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU, Jan Kiszka, 2011/12/15
- Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU, Lucas Meneghel Rodrigues, 2011/12/15
- Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU, Jan Kiszka, 2011/12/15
- Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU, Stefan Hajnoczi, 2011/12/15
- Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU, Kevin Wolf, 2011/12/15
- Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU, Stefan Hajnoczi, 2011/12/15
- Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU, Jan Kiszka, 2011/12/15
- Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU, Luiz Capitulino, 2011/12/15
Re: [Qemu-devel] [libvirt] Transitioning from HMP to QMP for QEMU, Stefan Berger, 2011/12/15
Re: [Qemu-devel] Transitioning from HMP to QMP for QEMU, Luiz Capitulino, 2011/12/15