powerpc: Only save/restore SDR1 if in hypervisor mode

Currently, when not in hypervisor mode the kernel
Oopses during suspend or hibernation when accessing
the SDR1 register, because it is only available
in hypervisor mode.  Access to it needs to be
protected in BEGIN/END_FW_FTR_SECTION.

Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reported-by: Jimmy Pan <jipan@redhat.com>
Tested-by: Jimmy Pan <jipan@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/swsusp_asm64.S b/arch/powerpc/kernel/swsusp_asm64.S
index 2204598..988f38d 100644 (file)
--- a/arch/powerpc/kernel/swsusp_asm64.S
+++ b/arch/powerpc/kernel/swsusp_asm64.S
@@ -114,7 +114,9 @@ _GLOBAL(swsusp_arch_suspend)
        SAVE_SPECIAL(MSR)
        SAVE_SPECIAL(XER)
 #ifdef CONFIG_PPC_BOOK3S_64
+BEGIN_FW_FTR_SECTION
        SAVE_SPECIAL(SDR1)
+END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR)
 #else
        SAVE_SPR(TCR)
 
@@ -231,7 +233,9 @@ nothing_to_copy:
        /* can't use RESTORE_SPECIAL(MSR) */
        ld      r0, SL_MSR(r11)
        mtmsrd  r0, 0
+BEGIN_FW_FTR_SECTION
        RESTORE_SPECIAL(SDR1)
+END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR)
 #else
        /* Restore SPRG1, be used to save paca */
        ld      r0, SL_SPRG1(r11)