diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index 53b31c2..b288735 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -215,7 +215,9 @@ enum {
 #define CPU_FTR_DAWR			LONG_ASM_CONST(0x0400000000000000)
 #define CPU_FTR_DABRX			LONG_ASM_CONST(0x0800000000000000)
 #define CPU_FTR_PMAO_BUG		LONG_ASM_CONST(0x1000000000000000)
+#define CPU_FTR_PKEY			LONG_ASM_CONST(0x2000000000000000)
 #define CPU_FTR_POWER9_DD1		LONG_ASM_CONST(0x4000000000000000)
+#define CPU_FTR_PKEY_EXECUTE		LONG_ASM_CONST(0x8000000000000000)
 
 #ifndef __ASSEMBLY__
 
@@ -436,7 +438,8 @@ enum {
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
 	    CPU_FTR_COHERENT_ICACHE | CPU_FTR_PURR | \
-	    CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_DABRX)
+	    CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_DABRX | \
+	    CPU_FTR_PKEY)
 #define CPU_FTRS_POWER6 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
@@ -444,7 +447,7 @@ enum {
 	    CPU_FTR_PURR | CPU_FTR_SPURR | CPU_FTR_REAL_LE | \
 	    CPU_FTR_DSCR | CPU_FTR_UNALIGNED_LD_STD | \
 	    CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_CFAR | \
-	    CPU_FTR_DABRX)
+	    CPU_FTR_DABRX | CPU_FTR_PKEY)
 #define CPU_FTRS_POWER7 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | CPU_FTR_ARCH_206 |\
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
@@ -453,7 +456,7 @@ enum {
 	    CPU_FTR_DSCR | CPU_FTR_SAO  | CPU_FTR_ASYM_SMT | \
 	    CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \
 	    CPU_FTR_ICSWX | CPU_FTR_CFAR | CPU_FTR_HVMODE | \
-	    CPU_FTR_VMX_COPY | CPU_FTR_HAS_PPR | CPU_FTR_DABRX)
+	    CPU_FTR_VMX_COPY | CPU_FTR_HAS_PPR | CPU_FTR_DABRX | CPU_FTR_PKEY)
 #define CPU_FTRS_POWER8 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | CPU_FTR_ARCH_206 |\
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
@@ -463,7 +466,8 @@ enum {
 	    CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \
 	    CPU_FTR_ICSWX | CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY | \
 	    CPU_FTR_DBELL | CPU_FTR_HAS_PPR | CPU_FTR_DAWR | \
-	    CPU_FTR_ARCH_207S | CPU_FTR_TM_COMP)
+	    CPU_FTR_ARCH_207S | CPU_FTR_TM_COMP | CPU_FTR_PKEY |\
+	    CPU_FTR_PKEY_EXECUTE)
 #define CPU_FTRS_POWER8E (CPU_FTRS_POWER8 | CPU_FTR_PMAO_BUG)
 #define CPU_FTRS_POWER8_DD1 (CPU_FTRS_POWER8 & ~CPU_FTR_DBELL)
 #define CPU_FTRS_POWER9 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
@@ -475,7 +479,8 @@ enum {
 	    CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \
 	    CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY | \
 	    CPU_FTR_DBELL | CPU_FTR_HAS_PPR | CPU_FTR_DAWR | \
-	    CPU_FTR_ARCH_207S | CPU_FTR_TM_COMP | CPU_FTR_ARCH_300)
+	    CPU_FTR_ARCH_207S | CPU_FTR_TM_COMP | CPU_FTR_ARCH_300 | \
+	    CPU_FTR_PKEY | CPU_FTR_PKEY_EXECUTE)
 #define CPU_FTRS_POWER9_DD1 ((CPU_FTRS_POWER9 | CPU_FTR_POWER9_DD1) & \
 			     (~CPU_FTR_SAO))
 #define CPU_FTRS_CELL	(CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index 95a3288..5a15d37 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -152,6 +152,7 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
 #define thread_pkey_regs_save(thread)
 #define thread_pkey_regs_restore(new_thread, old_thread)
 #define thread_pkey_regs_init(thread)
+#define pkey_mmu_values(total_data, total_execute)
 
 static inline int vma_pkey(struct vm_area_struct *vma)
 {
diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index 9ee4731..333fb28 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -13,6 +13,7 @@
 #define _ASM_POWERPC_KEYS_H
 
 #include <linux/jump_label.h>
+#include <asm/firmware.h>
 
 DECLARE_STATIC_KEY_TRUE(pkey_disabled);
 extern int pkeys_total; /* total pkeys as per device tree */
@@ -227,6 +228,15 @@ static inline void pkey_mm_init(struct mm_struct *mm)
 	mm->context.execute_only_pkey = -1;
 }
 
+static inline void pkey_mmu_values(int total_data, int total_execute)
+{
+	/*
+	 * Since any pkey can be used for data or execute, we will just treat
+	 * all keys as equal and track them as one entity.
+	 */
+	pkeys_total = total_data;
+}
+
 extern void thread_pkey_regs_save(struct thread_struct *thread);
 extern void thread_pkey_regs_restore(struct thread_struct *new_thread,
 				     struct thread_struct *old_thread);
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index f830562..8b75e9b 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -35,6 +35,7 @@
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <linux/cpu.h>
+#include <linux/pkeys.h>
 
 #include <asm/prom.h>
 #include <asm/rtas.h>
@@ -228,6 +229,22 @@ static void __init check_cpu_pa_features(unsigned long node)
 		      ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
 }
 
+static void __init check_cpu_pkey_feature(unsigned long node)
+{
+	const __be32 *ftrs;
+	int len, total_data, total_execute;
+
+	ftrs = of_get_flat_dt_prop(node, "ibm,processor-storage-keys", &len);
+	if (ftrs == NULL)
+		return;
+
+	len /= sizeof(int);
+	total_execute = (len >= 2) ? be32_to_cpu(ftrs[1]) : 0;
+	total_data = (len >= 1) ? be32_to_cpu(ftrs[0]) : 0;
+	pkey_mmu_values(total_data, total_execute);
+}
+
+
 #ifdef CONFIG_PPC_STD_MMU_64
 static void __init init_mmu_slb_size(unsigned long node)
 {
@@ -391,6 +408,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
 
 		check_cpu_feature_properties(node);
 		check_cpu_pa_features(node);
+		check_cpu_pkey_feature(node);
 	}
 
 	identical_pvr_fixup(node);
diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c
index 3b221bd..5047371 100644
--- a/arch/powerpc/mm/pkeys.c
+++ b/arch/powerpc/mm/pkeys.c
@@ -26,6 +26,14 @@
 #define PKEY_REG_BITS (sizeof(u64)*8)
 #define pkeyshift(pkey) (PKEY_REG_BITS - ((pkey+1) * AMR_BITS_PER_PKEY))
 
+static inline bool pkey_mmu_enabled(void)
+{
+	if (firmware_has_feature(FW_FEATURE_LPAR))
+		return pkeys_total;
+	else
+		return cpu_has_feature(CPU_FTR_PKEY);
+}
+
 void __init pkey_initialize(void)
 {
 	int os_reserved, i;
@@ -46,14 +54,9 @@ void __init pkey_initialize(void)
 		     __builtin_popcountl(ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT)
 				!= (sizeof(u64) * BITS_PER_BYTE));
 
-	/*
-	 * Disable the pkey system till everything is in place. A subsequent
-	 * patch will enable it.
-	 */
-	static_branch_enable(&pkey_disabled);
-
-	/* Lets assume 32 keys */
-	pkeys_total = 32;
+	/* Let's assume 32 keys if we are not told the number of pkeys. */
+	if (!pkeys_total)
+		pkeys_total = 32;
 
 	/*
 	 * Adjust the upper limit, based on the number of bits supported by
@@ -62,11 +65,19 @@ void __init pkey_initialize(void)
 	pkeys_total = min_t(int, pkeys_total,
 			(ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT));
 
+	if (!pkey_mmu_enabled() || radix_enabled() || !pkeys_total)
+		static_branch_enable(&pkey_disabled);
+	else
+		static_branch_disable(&pkey_disabled);
+
+	if (static_branch_likely(&pkey_disabled))
+		return;
+
 	/*
-	 * Disable execute_disable support for now. A subsequent patch will
-	 * enable it.
+	 * The device tree cannot be relied on for execute_disable support.
+	 * Hence we depend on CPU FTR.
 	 */
-	pkey_execute_disable_supported = false;
+	pkey_execute_disable_supported = cpu_has_feature(CPU_FTR_PKEY_EXECUTE);
 
 #ifdef CONFIG_PPC_4K_PAGES
 	/*
