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Commit 633440f1 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt
Browse files

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: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 8e83e905

arch/powerpc/kernel/setup_64.c

+5 −1
Original line number Diff line number Diff line
@@ -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);