On Fri, Mar 02, 2012 at 03:12:33PM +0100, Alexander Graf wrote: > When running inside a virtual machine, we can not modify timebase, so > let's just not call the functions for it then. > > This resolves hangs when booting e500 SMP guests on overcommitted hosts. > > Reported-by: Stuart Yoder <B08248@xxxxxxxxxxxxx> > Signed-off-by: Alexander Graf <agraf@xxxxxxx> > > --- > arch/powerpc/platforms/85xx/smp.c | 7 +++++++ > 1 files changed, 7 insertions(+), 0 deletions(-) > > diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c > index ff42490..d4b6c1f 100644 > --- a/arch/powerpc/platforms/85xx/smp.c > +++ b/arch/powerpc/platforms/85xx/smp.c > @@ -249,6 +249,13 @@ void __init mpc85xx_smp_init(void) > smp_85xx_ops.cause_ipi = doorbell_cause_ipi; > } > > + /* When running under a hypervisor, we can not modify tb */ > + np = of_find_node_by_path("/hypervisor"); > + if (np) { > + smp_85xx_ops.give_timebase = NULL; > + smp_85xx_ops.take_timebase = NULL; > + } I'm marking this superseded as we now only set give/take_timebase if a guts node is present that corresponds to an SMP SoC. QEMU currently advertises an mpc8544 guts (which is not SMP) and will eventually move to a paravirt device with no guts at all. -Scott -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html