Re: -smp >=2 + -no-kvm-irqchip broken

[Gleb Natapov <gleb@redhat.com>]

On Tue, Feb 02, 2010 at 07:56:42PM +0100, Jan Kiszka wrote:
> Jan Kiszka wrote:
> > Gleb Natapov wrote:
> >> On Tue, Feb 02, 2010 at 05:41:03PM +0100, Jan Kiszka wrote:
> >>> Gleb Natapov wrote:
> >>>> On Tue, Feb 02, 2010 at 05:29:53PM +0100, Jan Kiszka wrote:
> >>>>> Hi,
> >>>>>
> >>>>> notice while testing v2 of my vcpu state series: Starting SMP guests
> >>>>> like Linux or Vista without in-kernel irqchip and with more than one CPU
> >>>>> make them lock up during boot (Vista) or spit out messages like
> >>>>>
> >>>>> udevd[112] trap invalid opcode ip:7fc434630950 sp:7fff3cd3fcb8 error:0
> >>>>> in libc-2.9.so[7fc4345b2000+14f000]
> >>>>>
> >>>> Looks like interrupt is injected as exception. Can you try to bisect?
> >>> Already started (as low prio background task), first looking for a good
> >>> version. If you know a recent one, I'm a taker.
> >>>
> >> Nope, didn't try no kernel irqchip for a long time.
> > 
> > Kernel plays the key role here, either kvm-kmod or actually the kvm
> > module: kvm-kmod-2.6.31.6 works, the 2.6.32 series and later do not.
> > Digging deeper...
> 
> I take this back: It works for Linux guests, but Vista crashes also with
> old kvm-kmod. So there is no way around real debugging.
> 
Upstream qemu-kvm/kvm works for me. Boot linux with -smp 2 and
windows2008-32 with -smp 4.

--
			Gleb.