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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 <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2014-07-17 15:29:45 +10:00 committed by Benjamin Herrenschmidt
parent 8e83e9053f
commit 633440f18f
1 changed files with 5 additions and 1 deletions
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6
arch/powerpc/kernel/setup_64.c
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@ -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);