[Qemu-devel] Multiple monitor interfaces?

[Qemu-devel] Multiple monitor interfaces?

[Jun Koi]

Hi,

I am wondering if is it possible to have multiple monitor interfaces
at the same time? If so, how can we open more than one?

This might be useful for something like libvirt, so while we leave one
monitor port for libvirt, we can still access to another one to
control Qemu?

Thanks,
J

Re: [Qemu-devel] Multiple monitor interfaces?

[Luiz Capitulino]

On Tue, 27 Apr 2010 23:23:45 +0900
Jun Koi <junkoi2004@gmail.com> wrote:

> Hi,
> 
> I am wondering if is it possible to have multiple monitor interfaces
> at the same time? If so, how can we open more than one?

 The following command will create three monitors (stdio, vc and telnet
on port 4444):

# qemu [...] -chardev stdio,id=mon0 -mon chardev=mon0,mode=readline \
             -chardev socket,id=mon1,host=localhost,port=4444,server \
             -mon chardev=mon1,mode=readline \
             -chardev vc,id=mon2 -mon chardev=mon2,mode=readline

> This might be useful for something like libvirt, so while we leave one
> monitor port for libvirt, we can still access to another one to
> control Qemu?

 Historically, libvirt had support to only one monitor: the one it uses. But
now they're working on supporting custom command-line options, so adding
new monitors should be possible I think.

 Also, you can point libvirt to a script that opens an additional monitor
for you, some developers do this afaik.

Re: [Qemu-devel] Multiple monitor interfaces?

[Jun Koi]

On Wed, Apr 28, 2010 at 3:26 AM, Luiz Capitulino <lcapitulino@redhat.com> wrote:
> On Tue, 27 Apr 2010 23:23:45 +0900
> Jun Koi <junkoi2004@gmail.com> wrote:
>
>> Hi,
>>
>> I am wondering if is it possible to have multiple monitor interfaces
>> at the same time? If so, how can we open more than one?
>
>  The following command will create three monitors (stdio, vc and telnet
> on port 4444):
>
> # qemu [...] -chardev stdio,id=mon0 -mon chardev=mon0,mode=readline \
>             -chardev socket,id=mon1,host=localhost,port=4444,server \
>             -mon chardev=mon1,mode=readline \
>             -chardev vc,id=mon2 -mon chardev=mon2,mode=readline

This is very helpful, thanks.

Now if I want to open a monitor on an Unix domain socket, which
chardev (and its corresponding param) should I use??

Thanks,
J

Re: [Qemu-devel] Multiple monitor interfaces?

[Luiz Capitulino]

On Wed, 28 Apr 2010 12:20:42 +0900
Jun Koi <junkoi2004@gmail.com> wrote:

> On Wed, Apr 28, 2010 at 3:26 AM, Luiz Capitulino <lcapitulino@redhat.com> wrote:
> > On Tue, 27 Apr 2010 23:23:45 +0900
> > Jun Koi <junkoi2004@gmail.com> wrote:
> >
> >> Hi,
> >>
> >> I am wondering if is it possible to have multiple monitor interfaces
> >> at the same time? If so, how can we open more than one?
> >
> >  The following command will create three monitors (stdio, vc and telnet
> > on port 4444):
> >
> > # qemu [...] -chardev stdio,id=mon0 -mon chardev=mon0,mode=readline \
> >             -chardev socket,id=mon1,host=localhost,port=4444,server \
> >             -mon chardev=mon1,mode=readline \
> >             -chardev vc,id=mon2 -mon chardev=mon2,mode=readline
> 
> This is very helpful, thanks.
> 
> Now if I want to open a monitor on an Unix domain socket, which
> chardev (and its corresponding param) should I use??

 It's all in the man page:

 -chardev socket,id=mon0,path=/tmp/sock,server -mon chardev=mon0,mode=control

[Qemu-devel] Re: Multiple monitor interfaces?

[Jan Kiszka]

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Jun Koi wrote:
> Hi,
> 
> I am wondering if is it possible to have multiple monitor interfaces
> at the same time? If so, how can we open more than one?

Provide multiple -mon options on the command line (works with legacy
-monitor as well). Moreover, you get one for free once you open a gdb
session: try "monitor help" on the gdb prompt when connected to qemu.

Jan


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