diff --git a/docs/system/arm/emulation.rst b/docs/system/arm/emulation.rst
index f3eabdd..0053ddc 100644
--- a/docs/system/arm/emulation.rst
+++ b/docs/system/arm/emulation.rst
@@ -24,6 +24,7 @@
 - FEAT_I8MM (AArch64 Int8 matrix multiplication instructions)
 - FEAT_JSCVT (JavaScript conversion instructions)
 - FEAT_LOR (Limited ordering regions)
+- FEAT_LPA (Large Physical Address space)
 - FEAT_LRCPC (Load-acquire RCpc instructions)
 - FEAT_LRCPC2 (Load-acquire RCpc instructions v2)
 - FEAT_LSE (Large System Extensions)
diff --git a/target/arm/cpu-param.h b/target/arm/cpu-param.h
index 5f9c288..b59d505 100644
--- a/target/arm/cpu-param.h
+++ b/target/arm/cpu-param.h
@@ -10,7 +10,7 @@
 
 #ifdef TARGET_AARCH64
 # define TARGET_LONG_BITS             64
-# define TARGET_PHYS_ADDR_SPACE_BITS  48
+# define TARGET_PHYS_ADDR_SPACE_BITS  52
 # define TARGET_VIRT_ADDR_SPACE_BITS  52
 #else
 # define TARGET_LONG_BITS             32
diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
index 1de31ff..d88662c 100644
--- a/target/arm/cpu64.c
+++ b/target/arm/cpu64.c
@@ -795,7 +795,7 @@
     cpu->isar.id_aa64pfr1 = t;
 
     t = cpu->isar.id_aa64mmfr0;
-    t = FIELD_DP64(t, ID_AA64MMFR0, PARANGE, 5); /* PARange: 48 bits */
+    t = FIELD_DP64(t, ID_AA64MMFR0, PARANGE, 6); /* FEAT_LPA: 52 bits */
     cpu->isar.id_aa64mmfr0 = t;
 
     t = cpu->isar.id_aa64mmfr1;
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 28b4347..950f565 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -11173,6 +11173,7 @@
     [3] = 42,
     [4] = 44,
     [5] = 48,
+    [6] = 52,
 };
 
 /* The cpu-specific constant value of PAMax; also used by hw/arm/virt. */
@@ -11564,11 +11565,15 @@
     descaddr = extract64(ttbr, 0, 48);
 
     /*
-     * If the base address is out of range, raise AddressSizeFault.
+     * For FEAT_LPA and PS=6, bits [51:48] of descaddr are in [5:2] of TTBR.
+     *
+     * Otherwise, if the base address is out of range, raise AddressSizeFault.
      * In the pseudocode, this is !IsZero(baseregister<47:outputsize>),
      * but we've just cleared the bits above 47, so simplify the test.
      */
-    if (descaddr >> outputsize) {
+    if (outputsize > 48) {
+        descaddr |= extract64(ttbr, 2, 4) << 48;
+    } else if (descaddr >> outputsize) {
         level = 0;
         fault_type = ARMFault_AddressSize;
         goto do_fault;
@@ -11620,7 +11625,15 @@
         }
 
         descaddr = descriptor & descaddrmask;
-        if (descaddr >> outputsize) {
+
+        /*
+         * For FEAT_LPA and PS=6, bits [51:48] of descaddr are in [15:12]
+         * of descriptor.  Otherwise, if descaddr is out of range, raise
+         * AddressSizeFault.
+         */
+        if (outputsize > 48) {
+            descaddr |= extract64(descriptor, 12, 4) << 48;
+        } else if (descaddr >> outputsize) {
             fault_type = ARMFault_AddressSize;
             goto do_fault;
         }