[PATCH V2 2/2] powerpc/kexec: Reset HILE before kexec_sequence

[Samuel Mendoza-Jonas]

On powernv secondary cpus are returned to OPAL, and will then enter the
target kernel in big-endian. However if it is set the HILE bit will persist,
causing the first exception in the target kernel to be delivered in
litte-endian regardless of the kernel endianess.
Make sure that the HILE bit is switched off before entering
kexec_sequence.

Signed-off-by: Samuel Mendoza-Jonas <sam.mj at au1.ibm.com>
---
 arch/powerpc/kernel/machine_kexec_64.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index 1a74446..2266135c 100644
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -22,8 +22,10 @@
 #include <asm/page.h>
 #include <asm/current.h>
 #include <asm/machdep.h>
+#include <asm/opal.h>
 #include <asm/cacheflush.h>
 #include <asm/paca.h>
+#include <asm/firmware.h>
 #include <asm/mmu.h>
 #include <asm/sections.h>	/* _end */
 #include <asm/prom.h>
@@ -356,6 +358,10 @@ void default_machine_kexec(struct kimage *image)
 	 * switched to a static version!
 	 */
 
+	/* Reset HILE in case we kexec into an older BE kernel */
+	if (firmware_has_feature(FW_FEATURE_OPALv3))
+		opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
+
 	/* Some things are best done in assembly.  Finding globals with
 	 * a toc is easier in C, so pass in what we can.
 	 */
-- 
2.4.5