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

[Yun Wang <bimingery@xxxxxxxxx>]

So to fix the problem, I need to update the qemu version to version
1.7 or later?
BTW. I had this problem in both pvhvm and pv guest.
Does pv guest rely on qemu also?

Thanks for all the reply!

On Wed, Jan 29, 2014 at 6:14 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> 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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