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Re: [Qemu-devel] [PATCH v8 10/20] replay: introduce info hmp/qmp command
From: |
Pavel Dovgalyuk |
Subject: |
Re: [Qemu-devel] [PATCH v8 10/20] replay: introduce info hmp/qmp command |
Date: |
Fri, 21 Dec 2018 11:07:49 +0300 |
> From: Markus Armbruster [mailto:address@hidden
> Pavel Dovgalyuk <address@hidden> writes:
>
> > This patch introduces 'info replay' monitor command and
> > corresponding qmp request.
> > These commands request the current record/replay mode, replay log file name,
> > and the execution step (number or recorded/replayed instructions).
> > User may use step number for replay_seek/replay_break commands and
> > for controlling the execution of replay.
> >
> > Signed-off-by: Pavel Dovgalyuk <address@hidden>
> > Acked-by: Dr. David Alan Gilbert <address@hidden>
> >
> > --
> >
> > v2:
> > - renamed info_replay qmp into query-replay (suggested by Eric Blake)
> > v7:
> > - added empty line (suggested by Markus Armbruster)
> > ---
> > hmp-commands-info.hx | 14 ++++++++++++++
> > hmp.h | 1 +
> > qapi/misc.json | 35 +++++++++++++++++++++++++++++++++++
> > replay/Makefile.objs | 3 ++-
> > replay/replay-debugging.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> > 5 files changed, 94 insertions(+), 1 deletion(-)
> > create mode 100644 replay/replay-debugging.c
> >
> > diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
> > index cbee8b9..9f2f35e 100644
> > --- a/hmp-commands-info.hx
> > +++ b/hmp-commands-info.hx
> > @@ -918,6 +918,20 @@ STEXI
> > Show SEV information.
> > ETEXI
> >
> > + {
> > + .name = "replay",
> > + .args_type = "",
> > + .params = "",
> > + .help = "show parameters of the record/replay",
> > + .cmd = hmp_info_replay,
> > + },
> > +
> > +STEXI
> > address@hidden info replay
> > address@hidden info replay
> > +Display the current record/replay mode and the currently executing step.
> > +ETEXI
> > +
> > STEXI
> > @end table
> > ETEXI
> > diff --git a/hmp.h b/hmp.h
> > index 5f1addc..d792149 100644
> > --- a/hmp.h
> > +++ b/hmp.h
> > @@ -148,5 +148,6 @@ void hmp_hotpluggable_cpus(Monitor *mon, const QDict
> > *qdict);
> > void hmp_info_vm_generation_id(Monitor *mon, const QDict *qdict);
> > void hmp_info_memory_size_summary(Monitor *mon, const QDict *qdict);
> > void hmp_info_sev(Monitor *mon, const QDict *qdict);
> > +void hmp_info_replay(Monitor *mon, const QDict *qdict);
> >
> > #endif
> > diff --git a/qapi/misc.json b/qapi/misc.json
> > index 8325e0d..e47aea6 100644
> > --- a/qapi/misc.json
> > +++ b/qapi/misc.json
> > @@ -3113,6 +3113,41 @@
> > 'data': [ 'none', 'record', 'play' ] }
> >
> > ##
> > +# @ReplayInfo:
> > +#
> > +# Status of the record/replay mode.
> > +#
> > +# @mode: current mode.
> > +#
> > +# @filename: name of the record/replay log file.
> > +#
> > +# @step: current step number.
> > +#
> > +# Since: 4.0
> > +#
> > +##
> > +{ 'struct': 'ReplayInfo',
> > + 'data': { 'mode': 'ReplayMode', '*filename': 'str', 'step': 'int' } }
>
> @filename is optional. For each ReplayMode: is @filename always absent,
> always present, or can it be either?
>
> > +
> > +##
> > +# @query-replay:
> > +#
> > +# Retrieves the status of the execution record/replay.
> > +#
> > +# Returns: structure with the properties of the record/replay.
>
> You've used "parameters of the record/replay" (in HMP help info),
> "status of the record/replay mode" (QMP ReplayInfo doc), "the status of
> the execution record/replay" (QMP query-replay doc), and "structure with
> the properties of the record/replay". Please pick one. I think I'd
> pick "record/replay information".
>
> In my (superficial) review of v6, I asked what a client would do with
> @step. You gave two use cases:
>
> 1. Control current step to be sure that replay is not stalled due to the bug.
> 2. Requesting the step for some moment of execution to use it as a parameter
> of replay_seek/replay_break operations. I.e., for returning to the same
> point later.
>
> The first one is a bit vague. The second one sounds plausible enough to
> me at least for stopped VMs (for running VMs, it feels too imprecise to
> be useful, but what do I know). replay-break is in PATCH 11,
> replay-seek in PATCH 12. Would it make sense add a suitable reference
> to ReplayInfo's documentation then?
Thanks for reviewing, I'll update this in the next version.
Pavel Dovgalyuk
- [Qemu-devel] [PATCH v8 03/20] replay: disable default snapshot for record/replay, (continued)
- [Qemu-devel] [PATCH v8 03/20] replay: disable default snapshot for record/replay, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 04/20] replay: update docs for record/replay with block devices, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 06/20] replay: finish record/replay before closing the disks, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 05/20] replay: don't drain/flush bdrv queue while RR is working, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 07/20] qcow2: introduce icount field for snapshots, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 08/20] migration: introduce icount field for snapshots, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 09/20] replay: provide and accessor for rr filename, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 10/20] replay: introduce info hmp/qmp command, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 11/20] replay: introduce breakpoint at the specified step, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 12/20] replay: implement replay-seek command to proceed to the desired step, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 13/20] replay: refine replay-time module, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 14/20] replay: flush rr queue before loading the vmstate, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 15/20] gdbstub: add reverse step support in replay mode, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 16/20] gdbstub: add reverse continue support in replay mode, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 17/20] replay: describe reverse debugging in docs/replay.txt, Pavel Dovgalyuk, 2018/12/18
- [Qemu-devel] [PATCH v8 18/20] replay: add BH oneshot event for block layer, Pavel Dovgalyuk, 2018/12/18