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-rw-r--r--arch/powerpc/mm/pgtable-radix.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 8d00ab4222a7..29e502953688 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -312,6 +312,18 @@ static void update_hid_for_radix(void)
cpu_relax();
}
+static void radix_init_amor(void)
+{
+ /*
+ * In HV mode, we init AMOR (Authority Mask Override Register) so that
+ * the hypervisor and guest can setup IAMR (Instruction Authority Mask
+ * Register), enable key 0 and set it to 1.
+ *
+ * AMOR = 0b1100 .... 0000 (Mask for key 0 is 11)
+ */
+ mtspr(SPRN_AMOR, (3ul << 62));
+}
+
void __init radix__early_init_mmu(void)
{
unsigned long lpcr;
@@ -368,6 +380,7 @@ void __init radix__early_init_mmu(void)
lpcr = mfspr(SPRN_LPCR);
mtspr(SPRN_LPCR, lpcr | LPCR_UPRT | LPCR_HR);
radix_init_partition_table();
+ radix_init_amor();
}
memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE);
@@ -387,6 +400,7 @@ void radix__early_init_mmu_secondary(void)
mtspr(SPRN_PTCR,
__pa(partition_tb) | (PATB_SIZE_SHIFT - 12));
+ radix_init_amor();
}
}