Re: [Qemu-devel] [Qemu-stable] qmp commands get rejected

[mdroth <mdroth@linux.vnet.ibm.com>]

On Sat, May 25, 2013 at 12:12:22AM +0200, Stefan Priebe wrote:
> Am 25.05.2013 00:09, schrieb mdroth:
> >>>>>I would try to create a small example script.
> >>>>
> >>>>I use qmp-shell and other little scripts very often.
> >>>>
> >>>>>Am this be due to the fact that I don't wait for the welcome banner
> >>>>>right now?
> >>>>
> >>>>If you're not reading from the socket, then you'll get the banner back
> >>>>when
> >>>>you read your first response. But qom-set shouldn't fail because of that.
> >>
> >>I can workaround it by adding this patch:
> >>diff --git a/monitor.c b/monitor.c
> >>index 62aaebe..9997520 100644
> >>--- a/monitor.c
> >>+++ b/monitor.c
> >>@@ -4239,7 +4239,8 @@ static int monitor_can_read(void *opaque)
> >>  static int invalid_qmp_mode(const Monitor *mon, const char *cmd_name)
> >>  {
> >>      int is_cap = compare_cmd(cmd_name, "qmp_capabilities");
> >>-    return (qmp_cmd_mode(mon) ? is_cap : !is_cap);
> >>+//    return (qmp_cmd_mode(mon) ? is_cap : !is_cap);
> >>+    return ((is_cap > 0) ? 0 : (qmp_cmd_mode(mon) ? is_cap : !is_cap));
> >>  }
> >
> >I think this is unrelated to your original issue. If you issue
> >'qmp_capabilities' command more than once you will get CommandNotFound,
> >and that behavior seems to be present even with v1.3.0. This patch seems
> >to be masking the problem you're having (which seems to be state from
> >previous monitor sessions/connections leaking into subsequent ones).
> 
> That sounds reasonable. I'm using proxmox / PVE which does a lot of
> qmp queries in the background. So i might see situations where X
> connections in parallel do qmp queries.
> 
> >It's possible the GSource-based mechanism for handling I/O for chardev
> >backends is causing a difference in behavior. Still not sure exactly
> >what's going on though.
> Can i revert some patches to test?

I think somewhere prior to this one should be enough to test:

2ea5a7af7bfa576a5936400ccca4144caca9640b

> 
> Stefan
>