Re: [Xen-devel] [RFC] Improving CPU hotplug for 4.3 with qemu-xen

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Fri, Jul 19, 2013 at 4:26 PM, Anthony PERARD
<anthony.perard@xxxxxxxxxx> wrote:
> Hi,
>
> The cpu hotplug that have been backported from QEMU to qemu-xen (1.5 to
> 1.3) is incomplete. Especially, there is no way to know if a CPU is
> already marked as online by qemu. This result by those error messages
> from libxl:
>
> 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
> libxl: error: libxl_qmp.c:289:qmp_handle_error_response: received an
> error message from QMP server: Unable to add CPU: 1, it already exists
>
> So I tried to backport more patches so it will become possible for libxl
> to get the list of online cpu.
>
> But this result in *a lot* of patches.
>
> Here is the git tree and see the list of patches at the end of the mail:
> git://xenbits.xen.org/people/aperard/qemu-dm.git  backport-cpu-device
>
> There is still some work to be done like making sure everything is
> working properly and making some patches to use it with libxl.
>
> So George, is it worth getting those patches into Xen 4.3 to get ride of
> the error message ?

I think updates to the stable tree are now IanJ's decision.  It seems
like this is an awful lot to backport.

 -George

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