diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 25fac9577a..6826702ea6 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -1897,7 +1897,9 @@ void ppc_compat_add_property(Object *obj, const char *name,
 #define SPR_PSSCR             (0x357)
 #define SPR_440_INV0          (0x370)
 #define SPR_440_INV1          (0x371)
+#define SPR_TRIG1             (0x371)
 #define SPR_440_INV2          (0x372)
+#define SPR_TRIG2             (0x372)
 #define SPR_440_INV3          (0x373)
 #define SPR_440_ITV0          (0x374)
 #define SPR_440_ITV1          (0x375)
diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index 02b7aad9b0..3b6ccb5ea4 100644
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -5660,6 +5660,16 @@ static void register_power_common_book4_sprs(CPUPPCState *env)
                  SPR_NOACCESS, SPR_NOACCESS,
                  &spr_read_tfmr, &spr_write_tfmr,
                  0x00000000);
+    spr_register_hv(env, SPR_TRIG1, "TRIG1",
+                 SPR_NOACCESS, SPR_NOACCESS,
+                 &spr_access_nop, &spr_write_generic,
+                 &spr_access_nop, &spr_write_generic,
+                 0x00000000);
+    spr_register_hv(env, SPR_TRIG2, "TRIG2",
+                 SPR_NOACCESS, SPR_NOACCESS,
+                 &spr_access_nop, &spr_write_generic,
+                 &spr_access_nop, &spr_write_generic,
+                 0x00000000);
 #endif
 }