Re: [Xen-devel] [Xen-users] Issues with vcpu-set

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-01-28 at 18:44 -0700, Yun Wang wrote:
> Sorry for the so late reply.
> I had this issue in Xen-4.3.0 (official release) and Xen-4.4.0-rc1-25-g9a80d50

And are you using the version of qemu-xen which ships with those
releases or your own version, perhaps from upstream?

ISTR that vcpu hotplug for HVM guests was missing from qemu-xen in Xen
4.3.x but I thought it had been added during the 4.4.x development
cycle. Adding Anthony + xen-devel to confirm.

> Here is the /var/log/xen/
> Waiting for domain centos65.pv (domid 1) to die [pid 8116]
> 
> 
> Here is the output of "xl -vvv vcpu-set"

Is this from 4.3 or 4.4? I think at this point we should focus on the
issue with 4.4.

I also asked for your guest cfg file -- please can you show it to us.

> libxl: debug: libxl_qmp.c:707:libxl__qmp_initialize: connected to
> /var/run/xen/qmp-libxl-1
> 
> libxl: debug: libxl_qmp.c:299:qmp_handle_response: message type: qmp
> 
> libxl: debug: libxl_qmp.c:555:qmp_send_prepare: next qmp command: '{
> 
>     "execute": "qmp_capabilities",
> 
>     "id": 1
> 
> }
> 
> '
> 
> libxl: debug: libxl_qmp.c:299:qmp_handle_response: message type: return
> 
> libxl: debug: libxl_qmp.c:555:qmp_send_prepare: next qmp command: '{
> 
>     "execute": "cpu-add",
> 
>     "id": 2,
> 
>     "arguments": {
> 
>         "id": 0
> 
>     }
> 
> }
> 
> '
> 
> libxl: debug: libxl_qmp.c:299:qmp_handle_response: message type: error
> 
> libxl: error: libxl_qmp.c:289:qmp_handle_error_response: received an
> error message from QMP server: Not supported
> 
> xc: debug: hypercall buffer: total allocations:9 total releases:9
> 
> xc: debug: hypercall buffer: current allocations:0 maximum allocations:2
> 
> xc: debug: hypercall buffer: cache current size:2
> 
> xc: debug: hypercall buffer: cache hits:7 misses:2 toobig:0
> 
> On Tue, Oct 1, 2013 at 3:24 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > On Mon, 2013-09-30 at 10:52 -0600, Yun Wang wrote:
> >> Hi all,
> >>
> >> I tried to use "xl vcpu-set" to change the vCPU number of VMs in Xen
> >> 4.4-unstable and had the following errors.
> >
> > What was the full command line which you used?
> >
> > Which exact version of 4.4-unstable (i.e. git commit) were you using?
> >
> >> libxl: error: libxl_qmp.c:289:qmp_handle_error_response: received an
> >> error message from QMP server: Unable to add CPU: 0, it already
> >> exists.
> >>
> >> CPU hotplug is enabled in the guest OS.
> >
> > Please can you provide your guest cfg file and any relevant logs from
> > under /var/log/xen (especially the ones with the guest name in them).
> >
> > Please also try "xl -vvv vcpu-set ..." and provide the full logs of that
> > attempt.
> >
> > Ian.
> >



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