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| author | Michael Ellerman <mpe@ellerman.id.au> | 2014-07-17 07:29:45 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-07-28 06:11:27 +0200 |
| commit | 633440f18f5795aa28d990b92dd108486911bfd5 (patch) | |
| tree | d2fc80d2db7db64946928b572cacf4318dcf8a68 /arch | |
| parent | powerpc/pseries: Switch pseries drivers to use machine_xxx_initcall() (diff) | |
| download | linux-633440f18f5795aa28d990b92dd108486911bfd5.tar.xz linux-633440f18f5795aa28d990b92dd108486911bfd5.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/setup_64.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 694339043b56..75f94ae20e9e 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); |