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 <b08...@freescale.com>
> Signed-off-by: Alexander Graf <ag...@suse.de>
> ---
> 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;
> + }
> +
> smp_ops = &smp_85xx_ops;
Again, for 85xx we should *never* sync the timebase in the kernel,
hypervisor or no.
-Scott
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