Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected)

[Avi Kivity]

Kevin Shanahan wrote:
> On Tue, 2009-01-20 at 12:35 +0100, Ingo Molnar wrote:
>   
> > * Kevin Shanahan <kmshanah@xxxxxxxxxxx> wrote:
> >
> >     
> > > On Mon, 2009-01-19 at 22:45 +0100, Rafael J. Wysocki wrote:
> > >       
> > > > This message has been generated automatically as a part of a report
> > > > of regressions introduced between 2.6.27 and 2.6.28.
> > > >
> > > > The following bug entry is on the current list of known regressions
> > > > introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> > > > be listed and let me know (either way).
> > > >
> > > >
> > > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12465
> > > > Subject		: KVM guests stalling on 2.6.28 (bisected)
> > > > Submitter	: Kevin Shanahan <kmshanah@xxxxxxxxxxx>
> > > > Date		: 2009-01-17 03:37 (3 days old)
> > > >         
> > > Yes, please keep this on the list.
> > >       
> > This only seems to occur under KVM, right? I.e. you tested it with -no-kvm 
> > and the problem went away, correct?
> >     
>
> Well, the I couldn't make the test conditions identical, but it the
> problem didn't occur with the test I was able to do:
>
>   http://marc.info/?l=linux-kernel&m=123228728416498&w=2
>
>   

Can you also try with -no-kvm-irqchip?

You will need to comment out the lines

   /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps
    * to GSI 2.  GSI maps to ioapic 1-1.  This is not
    * the cleanest way of doing it but it should work. */

   if (vector == 0)
       vector = 2;

in qemu/hw/apic.c (should also fix -no-kvm smp).  This will change kvm 
wakeups to use signals rather than the in-kernel code, which may be buggy.

--
error compiling committee.c: too many arguments to function

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/