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Re: [PATCH V1 04/32] savevm: HMP Command for cprsave
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [PATCH V1 04/32] savevm: HMP Command for cprsave |
Date: |
Fri, 25 Sep 2020 10:26:55 +0100 |
User-agent: |
Mutt/1.14.6 (2020-07-11) |
* Steven Sistare (steven.sistare@oracle.com) wrote:
> On 9/11/2020 12:57 PM, Dr. David Alan Gilbert wrote:
> > * Steve Sistare (steven.sistare@oracle.com) wrote:
> >> Enable HMP access to the cprsave QMP command.
> >>
> >> Usage: cprsave <filename> <mode>
> >>
> >> Signed-off-by: Maran Wilson <maran.wilson@oracle.com>
> >> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
> >
> > I realise that the current mode is currently only 'reboot' - can you
> > please give us a clue as to why you've got a mode argument that's
> > currently only got one mode?
>
> Patch 14 adds the restart mode.
> I factored the patches by capability to make the review easier, first
> presenting the reboot patches, then the restart patches.
OK, but just add a comment here saying that you'll add another mode
later; otherwise it looks a bit weird.
Dave
> - Steve
>
> >> ---
> >> hmp-commands.hx | 18 ++++++++++++++++++
> >> include/monitor/hmp.h | 1 +
> >> monitor/hmp-cmds.c | 10 ++++++++++
> >> 3 files changed, 29 insertions(+)
> >>
> >> diff --git a/hmp-commands.hx b/hmp-commands.hx
> >> index 60f395c..c8defd9 100644
> >> --- a/hmp-commands.hx
> >> +++ b/hmp-commands.hx
> >> @@ -354,6 +354,24 @@ SRST
> >> ERST
> >>
> >> {
> >> + .name = "cprsave",
> >> + .args_type = "file:s,mode:s",
> >> + .params = "file 'reboot'",
> >> + .help = "create a checkpoint of the VM in file",
> >> + .cmd = hmp_cprsave,
> >> + },
> >> +
> >> +SRST
> >> +``cprsave`` *tag*
> >> + Stop VCPUs, create a checkpoint of the whole virtual machine and save it
> >> + in *file*.
> >> + If *mode* is 'reboot', the checkpoint can be cprload'ed after a host
> >> kexec
> >> + reboot.
> >> + exec() /usr/bin/qemu-exec if it exists, else exec
> >> /usr/bin/qemu-system-x86_64,
> >> + passing all the original command line arguments. The VCPUs remain
> >> paused.
> >> +ERST
> >> +
> >> + {
> >> .name = "delvm",
> >> .args_type = "name:s",
> >> .params = "tag",
> >> diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h
> >> index c986cfd..af8ee23 100644
> >> --- a/include/monitor/hmp.h
> >> +++ b/include/monitor/hmp.h
> >> @@ -59,6 +59,7 @@ void hmp_balloon(Monitor *mon, const QDict *qdict);
> >> void hmp_loadvm(Monitor *mon, const QDict *qdict);
> >> void hmp_savevm(Monitor *mon, const QDict *qdict);
> >> void hmp_delvm(Monitor *mon, const QDict *qdict);
> >> +void hmp_cprsave(Monitor *mon, const QDict *qdict);
> >> void hmp_migrate_cancel(Monitor *mon, const QDict *qdict);
> >> void hmp_migrate_continue(Monitor *mon, const QDict *qdict);
> >> void hmp_migrate_incoming(Monitor *mon, const QDict *qdict);
> >> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
> >> index ae4b6a4..59196ed 100644
> >> --- a/monitor/hmp-cmds.c
> >> +++ b/monitor/hmp-cmds.c
> >> @@ -1139,6 +1139,16 @@ void hmp_announce_self(Monitor *mon, const QDict
> >> *qdict)
> >> qapi_free_AnnounceParameters(params);
> >> }
> >>
> >> +void hmp_cprsave(Monitor *mon, const QDict *qdict)
> >> +{
> >> + Error *err = NULL;
> >> +
> >> + qmp_cprsave(qdict_get_try_str(qdict, "file"),
> >> + qdict_get_try_str(qdict, "mode"),
> >> + &err);
> >> + hmp_handle_error(mon, err);
> >> +}
> >> +
> >> void hmp_migrate_cancel(Monitor *mon, const QDict *qdict)
> >> {
> >> qmp_migrate_cancel(NULL);
> >> --
> >> 1.8.3.1
> >>
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK