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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-01-29 at 13:04 +0000, Anthony PERARD wrote:
> On Wed, Jan 29, 2014 at 12:39:47PM +0000, Ian Campbell wrote:
> > On Wed, 2014-01-29 at 12:36 +0000, Anthony PERARD wrote:
> > > On Wed, Jan 29, 2014 at 12:22:17PM +0000, Ian Campbell wrote:
> > > > On Wed, 2014-01-29 at 12:18 +0000, Anthony PERARD wrote:
> > > > > On Wed, Jan 29, 2014 at 10:11:44AM +0000, Ian Campbell wrote:
> > > > > > 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.
> > > > > 
> > > > > We've added vcpu hotplug to our tree in Xen 4.3.
> > > > > 
> > > > > QEMU upstream is able to do vcpu hotplug with Xen only with the last
> > > > > release, 1.7. The two previous release (1.5 and 1.6) miss two patches,
> > > > > and any QEMU release before that those not support cpu hotplug.
> > > > 
> > > > OK. IIRC Xen 4.3 included qemu 1.3 or so?
> > > 
> > > That's right, qemu 1.3.
> > > 
> > > > 4.4-rc1 should have had the 1.6 merge in it, but not 1.7, correct?
> > > 
> > > That's correct.
> > > 
> > > > So it also misses those patches.
> > > 
> > > No, I've put those patches on top of the merge, otherwise, there would
> > > have been regression.
> > 
> > So this functionality should work with xen 4.4.0-rc1 (using whatever
> > version was referenced by xen.git/Config.mk) or not?
> 
> Yes, it should. You can go back to my first reply to this threads and
> read the all mail ;-).

Sorry, but this wasn't unambiguously clear to me from your initial
reply, which spoke about broken releases and a fix which was in a
version we don't include yet.

>  I reply to what appear to me the "error" that
> made someone think that somethings goes wrong.

So it sounds like Yun Wang is using an upstream qemu and not our branch
and is therefore missing some fixes?

Ian.


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