[PATCH for-4.8 02/12] powerpc/mm/radix: Update LPCR HR bit as per ISA

[Aneesh Kumar K.V]

PowerISA 3.0 requires the MMU mode (radix vs. hash) of the hypervisor
to be mirrored in the LPCR register, in addition to the partition table.
This is done to avoid fetching from the table when deciding, among other
things, how to perform transitions to HV mode on some interrupts.
So let's set it up appropriately

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/reg.h  | 1 +
 arch/powerpc/mm/pgtable-radix.c | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 320136f5fe28..a5ba263e0353 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -354,6 +354,7 @@
 #define   LPCR_RMI     0x00000002      /* real mode is cache inhibit */
 #define   LPCR_HDICE   0x00000001      /* Hyp Decr enable (HV,PR,EE) */
 #define   LPCR_UPRT    0x00400000      /* Use Process Table (ISA 3) */
+#define   LPCR_HR      0x00100000
 #ifndef SPRN_LPID
 #define SPRN_LPID	0x13F	/* Logical Partition Identifier */
 #endif
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index e58707deef5c..f8a3bec315f7 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -337,7 +337,7 @@ void __init radix__early_init_mmu(void)
 	radix_init_page_sizes();
 	if (!firmware_has_feature(FW_FEATURE_LPAR)) {
 		lpcr = mfspr(SPRN_LPCR);
-		mtspr(SPRN_LPCR, lpcr | LPCR_UPRT);
+		mtspr(SPRN_LPCR, lpcr | LPCR_UPRT | LPCR_HR);
 		radix_init_partition_table();
 	}
 
@@ -352,7 +352,7 @@ void radix__early_init_mmu_secondary(void)
 	 */
 	if (!firmware_has_feature(FW_FEATURE_LPAR)) {
 		lpcr = mfspr(SPRN_LPCR);
-		mtspr(SPRN_LPCR, lpcr | LPCR_UPRT);
+		mtspr(SPRN_LPCR, lpcr | LPCR_UPRT | LPCR_HR);
 
 		mtspr(SPRN_PTCR,
 		      __pa(partition_tb) | (PATB_SIZE_SHIFT - 12));
-- 
2.7.4