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Re: [Xen-devel] Should Qemu monitor be enabled by default


  • To: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
  • From: "Christian Limpach" <christian.limpach@xxxxxxxxx>
  • Date: Thu, 12 Apr 2007 22:00:45 +0100
  • Cc: Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "You, Yongkang" <yongkang.you@xxxxxxxxx>, ?????? <kouya@xxxxxxxxxxxxxx>
  • Delivery-date: Thu, 12 Apr 2007 13:59:34 -0700
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On 4/12/07, Daniel P. Berrange <berrange@xxxxxxxxxx> wrote:
> No, the monitor in qemu is off by default, the patch is correct as is.

Is that a recent Xen-specific change to QEMU ? The regular QEMU has always
had the monitor on by default - and its on by default in Xen 3.0.3/4 :

Yes it is.  The default is not suitable.

> Why shouldn't both co-exist?  You can have either monitor=pty or
> monitor=vc.  This is how serial ports work already.

What I mean is that if we wanted to implement a 'xm monitor' command,
then XenD would need to launch QEMU with '-monitor pty' (or equivalent)
at which point you'd be unable to also have '-monitor vc' on the same
command line.

Which is why the monitor option should take a string, it can then
default to whatever is useable for "xm monitor".  "xm monitor" should
imho be xm console with an option to make it connect to the monitor
pty.

I've not had any trouble with it myself, but I've not tested it much.
I was refering to the earlier mail in this thread

http://lists.xensource.com/archives/html/xen-devel/2007-04/msg00222.html

where Nishi indicated his motivation for wanting access to the monitor
via a VC was that block-configure wasn't reliable.

You should have read the replies as well, before making claims that
something doesn't work.

   christian

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