Re: CPU hotplug add seems broken

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On Sun, Jan 10, 2010 at 3:39 PM, Gleb Natapov <gleb@xxxxxxxxxx> wrote:
> On Sat, Jan 09, 2010 at 04:30:11PM -0300, Daniel Bareiro wrote:
>> On Friday, 08 January 2010 19:35:04 +0900,
>> Ryota Ozaki wrote:
>>
>> > Hi all,
>>
>> Hi, Ryota.
>>
>> > I've tried CPU hotplug with latest qemu-kvm.git code,
>> > and got segmentation fault.
>>
>> I'm also having this problem but with Linux 2.6.32.2 + qemu-kvm-0.12.1.1
>> in the host:
>>
>> Jan  9 16:11:11 ubuntu kernel: [758479.480219] qemu-system-x86[29330]:
>> segfault at 90 ip 00007f5816bf3990 sp 00007fff9258fc88 error 4 in
>> libpthread-2.7.so[7f5816be8000+16000]
>>
>> I've guest with one cpu in which I try to add one more. For this I
>> execute the following in qemu monitor and here it is where I got
>> segmentation fault:
>>
>> (qemu) cpu_set 1 online
>> Connection closed by foreign host.
>>
>>
>> I'm not sure if the procedure that I'm following is the correct one. I
>> tried as much without using additional parameters when boots guest like
>> using -smp 1,maxcpus=2, but I reach the same result.
>>
>> The Kernel of guest has checked the "Support for hot-pluggable CPUs"
>> option, in case it is necessary.
>>
> CPU host-plug is not supported on qemu-kvm-0.12. It shouldn't segfault
> obviously,

I see. Anyway I think we need some workaround to avoid segfault.

> but ACPI code that handles CPU host-plug was not ported to
> SeaBIOS when it replaces BOCH BIOS.

Yeah, I confirmed it during memory hotplug work...

So I'd like to know when cpu hotplug comes back? I didn't see
it in qemu-0.13 feature requests.

  ozaki-r

>
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>                        Gleb.
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