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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [PATCH 1/3] powerpc/mm/radix: Update LPCR only if it is powernv
Date: Tue, 31 May 2016 11:56:29 +0530	[thread overview]
Message-ID: <1464675991-13023-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> (raw)

LPCR cannot be updated when running in guest mode.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 arch/powerpc/mm/pgtable-radix.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 18b2c11604fa..c939e6e57a9e 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -296,11 +296,6 @@ found:
 void __init radix__early_init_mmu(void)
 {
 	unsigned long lpcr;
-	/*
-	 * setup LPCR UPRT based on mmu_features
-	 */
-	lpcr = mfspr(SPRN_LPCR);
-	mtspr(SPRN_LPCR, lpcr | LPCR_UPRT);
 
 #ifdef CONFIG_PPC_64K_PAGES
 	/* PAGE_SIZE mappings */
@@ -343,8 +338,11 @@ void __init radix__early_init_mmu(void)
 	__pte_frag_size_shift = H_PTE_FRAG_SIZE_SHIFT;
 
 	radix_init_page_sizes();
-	if (!firmware_has_feature(FW_FEATURE_LPAR))
+	if (!firmware_has_feature(FW_FEATURE_LPAR)) {
+		lpcr = mfspr(SPRN_LPCR);
+		mtspr(SPRN_LPCR, lpcr | LPCR_UPRT);
 		radix_init_partition_table();
+	}
 
 	radix_init_pgtable();
 }
@@ -353,16 +351,15 @@ void radix__early_init_mmu_secondary(void)
 {
 	unsigned long lpcr;
 	/*
-	 * setup LPCR UPRT based on mmu_features
+	 * update partition table control register and UPRT
 	 */
-	lpcr = mfspr(SPRN_LPCR);
-	mtspr(SPRN_LPCR, lpcr | LPCR_UPRT);
-	/*
-	 * update partition table control register, 64 K size.
-	 */
-	if (!firmware_has_feature(FW_FEATURE_LPAR))
+	if (!firmware_has_feature(FW_FEATURE_LPAR)) {
+		lpcr = mfspr(SPRN_LPCR);
+		mtspr(SPRN_LPCR, lpcr | LPCR_UPRT);
+
 		mtspr(SPRN_PTCR,
 		      __pa(partition_tb) | (PATB_SIZE_SHIFT - 12));
+	}
 }
 
 void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base,
-- 
2.7.4

             reply	other threads:[~2016-05-31  6:26 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-31  6:26 Aneesh Kumar K.V [this message]
2016-05-31  6:26 ` [PATCH 2/3] powerpc/mm/hash: Fix the reference bit update when handling hash fault Aneesh Kumar K.V
2016-06-06  0:17   ` [2/3] " Michael Ellerman
2016-05-31  6:26 ` [PATCH 3/3] powerpc/mm/radix: Add missing tlb flush Aneesh Kumar K.V
2016-06-06  0:17   ` [3/3] " Michael Ellerman
2016-06-03  5:38 ` [PATCH 1/3] powerpc/mm/radix: Update LPCR only if it is powernv Balbir Singh
2016-06-06  0:17 ` [1/3] " Michael Ellerman

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