Re: [Qemu-devel] [PATCH qemu-kvm] Fix: SCI isn't sent on cpu hotplug

[Igor Mammedov <imammedo@redhat.com>]

On 01/09/2012 11:19 AM, Jan Kiszka wrote:
> On 2012-01-09 11:07, Gleb Natapov wrote:
>> On Mon, Jan 09, 2012 at 11:03:10AM +0100, Jan Kiszka wrote:
>>> On 2012-01-09 09:47, Gleb Natapov wrote:
>>>> On Sun, Jan 08, 2012 at 10:40:04PM +0100, Igor Mammedov wrote:
>>>>>   Change introduced by e71f08bb4a
>>>>>      "Fix cpu/pci hotplug to generate level triggered interrupt."
>>>>>   was lost somewhre along the way. And as result SCI is not sent in
>>>>>   case of cpu hotplug event.
>>>>>   Restoring hunk 1 of e71f08bb4a fixes issue.
>>>>>
>>>> Hmm, I sent similar patch [1] last time someone complained about cpu hotplug
>>>> here. Which remind me that in that thread more problem were found in cpu
>>>> hotplug. IIRC Jan collected all the patches. Jan, what happened to
>>>> them?
>>>
>>> My patches should have been superseded by the work of Ping Fan on the
>>> ICC bus.
>>>
>> Didn't they fix some problems with bringing new cpu online, not just
>> making cpu hotplugable in qdev? May be I misremember.
>
> Let me check... Hmm, yes, there were also some bits required to bring up
> the new VCPU thread properly and sync its initial state to the kernel.

CPU bring-up seems to be broken now, guest sees a new cpu but I can't
online it inside guest with error: "CPUx: Not responding". But it
works with old qemu-kvm [3925c857a574].
Jan could you point me to this patches?

> That was not part of Ping Fan's ICC patches, also not of the VCPU life
> cycle patches.

I'm trying to re-base cpu-hotplug to qemu.git, and with ICC patches it's
working like the current qemu-kvm head. But without above mentioned fixes
it seams to be useless.

>
>> BTW do you know
>> what happened with ICC bus patches?
>
> Were forgotten to merge? And/or they lacked some acked-by or
> reviewed-by. :-/
>
> Jan
>

-- 
Thanks,
  Igor