Re: CPU hotplug add seems broken

[Gleb Natapov <gleb@redhat.com>]

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

--
			Gleb.