From 633440f18f5795aa28d990b92dd108486911bfd5 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Thu, 17 Jul 2014 15:29:45 +1000 Subject: [PATCH] powerpc: Document how we set AIL on guest kernels I spent ten minutes scratching my head, trying to work out where we enabled relocation on interrupts for guest kernels. Expand the doco to make it clear. Signed-off-by: Michael Ellerman Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/setup_64.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 6943390..75f94ae 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -201,7 +201,11 @@ static void cpu_ready_for_interrupts(void) /* Set IR and DR in PACA MSR */ get_paca()->kernel_msr = MSR_KERNEL; - /* Enable AIL if supported */ + /* + * Enable AIL if supported, and we are in hypervisor mode. If we are + * not in hypervisor mode, we enable relocation-on interrupts later + * in pSeries_setup_arch() using the H_SET_MODE hcall. + */ if (cpu_has_feature(CPU_FTR_HVMODE) && cpu_has_feature(CPU_FTR_ARCH_207S)) { unsigned long lpcr = mfspr(SPRN_LPCR); -- 2.7.4