tcg: Convert TARGET_SUPPORTS_MTTCG to TCGCPUOps::mttcg_supported field

Instead of having a compile-time TARGET_SUPPORTS_MTTCG definition,
have each target set the 'mttcg_supported' field in the TCGCPUOps
structure.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250405161320.76854-17-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

44 files changed, 34 insertions, 28 deletions

diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c
index ecdd488..b0d4e3e 100644
--- a/accel/tcg/tcg-all.c
+++ b/accel/tcg/tcg-all.c
@@ -41,8 +41,9 @@
 #include "hw/boards.h"
 #include "system/tcg.h"
 #endif
+#include "accel/tcg/cpu-ops.h"
 #include "internal-common.h"
-#include "cpu-param.h"
+#include "cpu.h"
 
 
 struct TCGState {
@@ -88,11 +89,9 @@ static int tcg_init_machine(MachineState *ms)
     unsigned max_threads = 1;
 
 #ifndef CONFIG_USER_ONLY
-# ifdef TARGET_SUPPORTS_MTTCG
-    bool mttcg_supported = true;
-# else
-    bool mttcg_supported = false;
-# endif
+    CPUClass *cc = CPU_CLASS(object_class_by_name(CPU_RESOLVING_TYPE));
+    bool mttcg_supported = cc->tcg_ops->mttcg_supported;
+
     switch (s->mttcg_enabled) {
     case ON_OFF_AUTO_AUTO:
         /*
diff --git a/configs/targets/aarch64-softmmu.mak b/configs/targets/aarch64-softmmu.mak
index 82cb72c..5dfeb35 100644
--- a/configs/targets/aarch64-softmmu.mak
+++ b/configs/targets/aarch64-softmmu.mak
@@ -1,6 +1,5 @@
 TARGET_ARCH=aarch64
 TARGET_BASE_ARCH=arm
-TARGET_SUPPORTS_MTTCG=y
 TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml gdb-xml/arm-m-profile-mve.xml gdb-xml/aarch64-pauth.xml
 # needed by boot.c
diff --git a/configs/targets/alpha-softmmu.mak b/configs/targets/alpha-softmmu.mak
index 89f3517..5275076 100644
--- a/configs/targets/alpha-softmmu.mak
+++ b/configs/targets/alpha-softmmu.mak
@@ -1,3 +1,2 @@
 TARGET_ARCH=alpha
-TARGET_SUPPORTS_MTTCG=y
 TARGET_LONG_BITS=64
diff --git a/configs/targets/arm-softmmu.mak b/configs/targets/arm-softmmu.mak
index afc64f5..6a5a8ed 100644
--- a/configs/targets/arm-softmmu.mak
+++ b/configs/targets/arm-softmmu.mak
@@ -1,5 +1,4 @@
 TARGET_ARCH=arm
-TARGET_SUPPORTS_MTTCG=y
 TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml gdb-xml/arm-m-profile-mve.xml
 # needed by boot.c
 TARGET_NEED_FDT=y
diff --git a/configs/targets/hppa-softmmu.mak b/configs/targets/hppa-softmmu.mak
index 63ca74e..ea33110 100644
--- a/configs/targets/hppa-softmmu.mak
+++ b/configs/targets/hppa-softmmu.mak
@@ -1,4 +1,3 @@
 TARGET_ARCH=hppa
 TARGET_BIG_ENDIAN=y
-TARGET_SUPPORTS_MTTCG=y
 TARGET_LONG_BITS=64
diff --git a/configs/targets/i386-softmmu.mak b/configs/targets/i386-softmmu.mak
index 5dd8921..e9d89e8 100644
--- a/configs/targets/i386-softmmu.mak
+++ b/configs/targets/i386-softmmu.mak
@@ -1,5 +1,4 @@
 TARGET_ARCH=i386
-TARGET_SUPPORTS_MTTCG=y
 TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_KVM_HAVE_RESET_PARKED_VCPU=y
 TARGET_XML_FILES= gdb-xml/i386-32bit.xml
diff --git a/configs/targets/loongarch64-softmmu.mak b/configs/targets/loongarch64-softmmu.mak
index 3513411..fc44c54 100644
--- a/configs/targets/loongarch64-softmmu.mak
+++ b/configs/targets/loongarch64-softmmu.mak
@@ -1,7 +1,6 @@
 TARGET_ARCH=loongarch64
 TARGET_BASE_ARCH=loongarch
 TARGET_KVM_HAVE_GUEST_DEBUG=y
-TARGET_SUPPORTS_MTTCG=y
 TARGET_XML_FILES= gdb-xml/loongarch-base32.xml gdb-xml/loongarch-base64.xml gdb-xml/loongarch-fpu.xml gdb-xml/loongarch-lsx.xml gdb-xml/loongarch-lasx.xml
 # all boards require libfdt
 TARGET_NEED_FDT=y
diff --git a/configs/targets/microblaze-softmmu.mak b/configs/targets/microblaze-softmmu.mak
index 99a33ed..23457d0 100644
--- a/configs/targets/microblaze-softmmu.mak
+++ b/configs/targets/microblaze-softmmu.mak
@@ -1,6 +1,5 @@
 TARGET_ARCH=microblaze
 TARGET_BIG_ENDIAN=y
-TARGET_SUPPORTS_MTTCG=y
 # needed by boot.c
 TARGET_NEED_FDT=y
 TARGET_XML_FILES=gdb-xml/microblaze-core.xml gdb-xml/microblaze-stack-protect.xml
diff --git a/configs/targets/microblazeel-softmmu.mak b/configs/targets/microblazeel-softmmu.mak
index 52cdeae..c82c509 100644
--- a/configs/targets/microblazeel-softmmu.mak
+++ b/configs/targets/microblazeel-softmmu.mak
@@ -1,5 +1,4 @@
 TARGET_ARCH=microblaze
-TARGET_SUPPORTS_MTTCG=y
 # needed by boot.c
 TARGET_NEED_FDT=y
 TARGET_XML_FILES=gdb-xml/microblaze-core.xml gdb-xml/microblaze-stack-protect.xml
diff --git a/configs/targets/mips-softmmu.mak b/configs/targets/mips-softmmu.mak
index b62a088..c958806 100644
--- a/configs/targets/mips-softmmu.mak
+++ b/configs/targets/mips-softmmu.mak
@@ -1,4 +1,3 @@
 TARGET_ARCH=mips
 TARGET_BIG_ENDIAN=y
-TARGET_SUPPORTS_MTTCG=y
 TARGET_LONG_BITS=32
diff --git a/configs/targets/mipsel-softmmu.mak b/configs/targets/mipsel-softmmu.mak
index 620ec68..90e09bd 100644
--- a/configs/targets/mipsel-softmmu.mak
+++ b/configs/targets/mipsel-softmmu.mak
@@ -1,3 +1,2 @@
 TARGET_ARCH=mips
-TARGET_SUPPORTS_MTTCG=y
 TARGET_LONG_BITS=32
diff --git a/configs/targets/or1k-softmmu.mak b/configs/targets/or1k-softmmu.mak
index adfddb1..0e47d98 100644
--- a/configs/targets/or1k-softmmu.mak
+++ b/configs/targets/or1k-softmmu.mak
@@ -1,5 +1,4 @@
 TARGET_ARCH=openrisc
-TARGET_SUPPORTS_MTTCG=y
 TARGET_BIG_ENDIAN=y
 # needed by boot.c and all boards
 TARGET_NEED_FDT=y
diff --git a/configs/targets/ppc64-softmmu.mak b/configs/targets/ppc64-softmmu.mak
index 7cee0e9..7457286 100644
--- a/configs/targets/ppc64-softmmu.mak
+++ b/configs/targets/ppc64-softmmu.mak
@@ -1,7 +1,6 @@
 TARGET_ARCH=ppc64
 TARGET_BASE_ARCH=ppc
 TARGET_BIG_ENDIAN=y
-TARGET_SUPPORTS_MTTCG=y
 TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_XML_FILES= gdb-xml/power64-core.xml gdb-xml/power-fpu.xml gdb-xml/power-altivec.xml gdb-xml/power-spe.xml gdb-xml/power-vsx.xml
 # all boards require libfdt
diff --git a/configs/targets/riscv32-softmmu.mak b/configs/targets/riscv32-softmmu.mak
index c828066..db55275 100644
--- a/configs/targets/riscv32-softmmu.mak
+++ b/configs/targets/riscv32-softmmu.mak
@@ -1,6 +1,5 @@
 TARGET_ARCH=riscv32
 TARGET_BASE_ARCH=riscv
-TARGET_SUPPORTS_MTTCG=y
 TARGET_XML_FILES= gdb-xml/riscv-32bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-32bit-virtual.xml
 # needed by boot.c
 TARGET_NEED_FDT=y
diff --git a/configs/targets/riscv64-softmmu.mak b/configs/targets/riscv64-softmmu.mak
index 09f613d..2bdd4a6 100644
--- a/configs/targets/riscv64-softmmu.mak
+++ b/configs/targets/riscv64-softmmu.mak
@@ -1,6 +1,5 @@
 TARGET_ARCH=riscv64
 TARGET_BASE_ARCH=riscv
-TARGET_SUPPORTS_MTTCG=y
 TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_XML_FILES= gdb-xml/riscv-64bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-64bit-virtual.xml gdb-xml/riscv-32bit-cpu.xml gdb-xml/riscv-32bit-virtual.xml
 # needed by boot.c
diff --git a/configs/targets/s390x-softmmu.mak b/configs/targets/s390x-softmmu.mak
index 5242ebe..76dd5de 100644
--- a/configs/targets/s390x-softmmu.mak
+++ b/configs/targets/s390x-softmmu.mak
@@ -1,6 +1,5 @@
 TARGET_ARCH=s390x
 TARGET_BIG_ENDIAN=y
-TARGET_SUPPORTS_MTTCG=y
 TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_XML_FILES= gdb-xml/s390x-core64.xml gdb-xml/s390-acr.xml gdb-xml/s390-fpr.xml gdb-xml/s390-vx.xml gdb-xml/s390-cr.xml gdb-xml/s390-virt.xml gdb-xml/s390-virt-kvm.xml gdb-xml/s390-gs.xml
 TARGET_LONG_BITS=64
diff --git a/configs/targets/sparc-softmmu.mak b/configs/targets/sparc-softmmu.mak
index 78c2e25..57801fa 100644
--- a/configs/targets/sparc-softmmu.mak
+++ b/configs/targets/sparc-softmmu.mak
@@ -1,4 +1,3 @@
 TARGET_ARCH=sparc
 TARGET_BIG_ENDIAN=y
-TARGET_SUPPORTS_MTTCG=y
 TARGET_LONG_BITS=32
diff --git a/configs/targets/sparc64-softmmu.mak b/configs/targets/sparc64-softmmu.mak
index f7bab97..2504e31 100644
--- a/configs/targets/sparc64-softmmu.mak
+++ b/configs/targets/sparc64-softmmu.mak
@@ -1,5 +1,4 @@
 TARGET_ARCH=sparc64
 TARGET_BASE_ARCH=sparc
 TARGET_BIG_ENDIAN=y
-TARGET_SUPPORTS_MTTCG=y
 TARGET_LONG_BITS=64
diff --git a/configs/targets/x86_64-softmmu.mak b/configs/targets/x86_64-softmmu.mak
index 1ceefde..5619b2b 100644
--- a/configs/targets/x86_64-softmmu.mak
+++ b/configs/targets/x86_64-softmmu.mak
@@ -1,6 +1,5 @@
 TARGET_ARCH=x86_64
 TARGET_BASE_ARCH=i386
-TARGET_SUPPORTS_MTTCG=y
 TARGET_KVM_HAVE_GUEST_DEBUG=y
 TARGET_KVM_HAVE_RESET_PARKED_VCPU=y
 TARGET_XML_FILES= gdb-xml/i386-64bit.xml
diff --git a/configs/targets/xtensa-softmmu.mak b/configs/targets/xtensa-softmmu.mak
index 65845df..2a97973 100644
--- a/configs/targets/xtensa-softmmu.mak
+++ b/configs/targets/xtensa-softmmu.mak
@@ -1,3 +1,2 @@
 TARGET_ARCH=xtensa
-TARGET_SUPPORTS_MTTCG=y
 TARGET_LONG_BITS=32
diff --git a/configs/targets/xtensaeb-softmmu.mak b/configs/targets/xtensaeb-softmmu.mak
index f1f789d..5204729 100644
--- a/configs/targets/xtensaeb-softmmu.mak
+++ b/configs/targets/xtensaeb-softmmu.mak
@@ -1,4 +1,3 @@
 TARGET_ARCH=xtensa
 TARGET_BIG_ENDIAN=y
-TARGET_SUPPORTS_MTTCG=y
 TARGET_LONG_BITS=32
diff --git a/docs/devel/multi-thread-tcg.rst b/docs/devel/multi-thread-tcg.rst
index 14a2a9d..da9a153 100644
--- a/docs/devel/multi-thread-tcg.rst
+++ b/docs/devel/multi-thread-tcg.rst
@@ -30,7 +30,7 @@ user-space thread. This is enabled by default for all FE/BE
 combinations where the host memory model is able to accommodate the
 guest (TCGCPUOps::guest_default_memory_order & ~TCG_TARGET_DEFAULT_MO is zero)
 and the guest has had the required work done to support this safely
-(TARGET_SUPPORTS_MTTCG).
+(TCGCPUOps::mttcg_supported).
 
 System emulation will fall back to the original round robin approach
 if:
diff --git a/include/accel/tcg/cpu-ops.h b/include/accel/tcg/cpu-ops.h
index a4932fc..0e43525 100644
--- a/include/accel/tcg/cpu-ops.h
+++ b/include/accel/tcg/cpu-ops.h
@@ -19,6 +19,14 @@
 #include "tcg/tcg-mo.h"
 
 struct TCGCPUOps {
+    /**
+     * mttcg_supported: multi-threaded TCG is supported
+     *
+     * Target (TCG frontend) supports:
+     *   - atomic instructions
+     *   - memory ordering primitives (barriers)
+     */
+    bool mttcg_supported;
 
     /**
      * @guest_default_memory_order: default barrier that is required
diff --git a/include/exec/poison.h b/include/exec/poison.h
index a09e0c1..bc42271 100644
--- a/include/exec/poison.h
+++ b/include/exec/poison.h
@@ -35,7 +35,6 @@
 
 #pragma GCC poison TARGET_HAS_BFLT
 #pragma GCC poison TARGET_NAME
-#pragma GCC poison TARGET_SUPPORTS_MTTCG
 #pragma GCC poison TARGET_BIG_ENDIAN
 #pragma GCC poison TCG_GUEST_DEFAULT_MO
 #pragma GCC poison TARGET_HAS_PRECISE_SMC
diff --git a/target/alpha/cpu.c b/target/alpha/cpu.c
index eeaf3a8..35fb145 100644
--- a/target/alpha/cpu.c
+++ b/target/alpha/cpu.c
@@ -237,6 +237,7 @@ static const struct SysemuCPUOps alpha_sysemu_ops = {
 static const TCGCPUOps alpha_tcg_ops = {
     /* Alpha processors have a weak memory model */
     .guest_default_memory_order = 0,
+    .mttcg_supported = true,
 
     .initialize = alpha_translate_init,
     .translate_code = alpha_translate_code,
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 3e9760b..377791c 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -2671,6 +2671,7 @@ static const struct SysemuCPUOps arm_sysemu_ops = {
 
 #ifdef CONFIG_TCG
 static const TCGCPUOps arm_tcg_ops = {
+    .mttcg_supported = true,
     /* ARM processors have a weak memory model */
     .guest_default_memory_order = 0,
 
diff --git a/target/arm/tcg/cpu-v7m.c b/target/arm/tcg/cpu-v7m.c
index 89d4e4b..f71560a 100644
--- a/target/arm/tcg/cpu-v7m.c
+++ b/target/arm/tcg/cpu-v7m.c
@@ -234,6 +234,7 @@ static void cortex_m55_initfn(Object *obj)
 static const TCGCPUOps arm_v7m_tcg_ops = {
     /* ARM processors have a weak memory model */
     .guest_default_memory_order = 0,
+    .mttcg_supported = true,
 
     .initialize = arm_translate_init,
     .translate_code = arm_translate_code,
diff --git a/target/avr/cpu.c b/target/avr/cpu.c
index 8f79cf4..84f3b83 100644
--- a/target/avr/cpu.c
+++ b/target/avr/cpu.c
@@ -225,6 +225,7 @@ static const struct SysemuCPUOps avr_sysemu_ops = {
 
 static const TCGCPUOps avr_tcg_ops = {
     .guest_default_memory_order = 0,
+    .mttcg_supported = false,
     .initialize = avr_cpu_tcg_init,
     .translate_code = avr_cpu_translate_code,
     .synchronize_from_tb = avr_cpu_synchronize_from_tb,
diff --git a/target/hexagon/cpu.c b/target/hexagon/cpu.c
index 3d14e5c..3c51912 100644
--- a/target/hexagon/cpu.c
+++ b/target/hexagon/cpu.c
@@ -327,6 +327,7 @@ static void hexagon_cpu_init(Object *obj)
 static const TCGCPUOps hexagon_tcg_ops = {
     /* MTTCG not yet supported: require strict ordering */
     .guest_default_memory_order = TCG_MO_ALL,
+    .mttcg_supported = false,
     .initialize = hexagon_translate_init,
     .translate_code = hexagon_translate_code,
     .synchronize_from_tb = hexagon_cpu_synchronize_from_tb,
diff --git a/target/hppa/cpu.c b/target/hppa/cpu.c
index dfbd933..10e18c9 100644
--- a/target/hppa/cpu.c
+++ b/target/hppa/cpu.c
@@ -260,6 +260,7 @@ static const TCGCPUOps hppa_tcg_ops = {
      * basis.  It's probably easier to fall back to a strong memory model.
      */
     .guest_default_memory_order = TCG_MO_ALL,
+    .mttcg_supported = true,
 
     .initialize = hppa_translate_init,
     .translate_code = hppa_translate_code,
diff --git a/target/i386/tcg/tcg-cpu.c b/target/i386/tcg/tcg-cpu.c
index e13d0f6..621502c 100644
--- a/target/i386/tcg/tcg-cpu.c
+++ b/target/i386/tcg/tcg-cpu.c
@@ -125,6 +125,7 @@ static bool x86_debug_check_breakpoint(CPUState *cs)
 #include "accel/tcg/cpu-ops.h"
 
 const TCGCPUOps x86_tcg_ops = {
+    .mttcg_supported = true,
     /*
      * The x86 has a strong memory model with some store-after-load re-ordering
      */
diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index f5b8ef2..fe9462b 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -865,6 +865,7 @@ static void loongarch_cpu_dump_state(CPUState *cs, FILE *f, int flags)
 
 static const TCGCPUOps loongarch_tcg_ops = {
     .guest_default_memory_order = 0,
+    .mttcg_supported = true,
 
     .initialize = loongarch_translate_init,
     .translate_code = loongarch_translate_code,
diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
index b2d8c8f..99adc5e 100644
--- a/target/m68k/cpu.c
+++ b/target/m68k/cpu.c
@@ -591,6 +591,7 @@ static const struct SysemuCPUOps m68k_sysemu_ops = {
 static const TCGCPUOps m68k_tcg_ops = {
     /* MTTCG not yet supported: require strict ordering */
     .guest_default_memory_order = TCG_MO_ALL,
+    .mttcg_supported = false,
 
     .initialize = m68k_tcg_init,
     .translate_code = m68k_translate_code,
diff --git a/target/microblaze/cpu.c b/target/microblaze/cpu.c
index 4efba0d..edfb057 100644
--- a/target/microblaze/cpu.c
+++ b/target/microblaze/cpu.c
@@ -429,6 +429,7 @@ static const struct SysemuCPUOps mb_sysemu_ops = {
 static const TCGCPUOps mb_tcg_ops = {
     /* MicroBlaze is always in-order. */
     .guest_default_memory_order = TCG_MO_ALL,
+    .mttcg_supported = true,
 
     .initialize = mb_tcg_init,
     .translate_code = mb_translate_code,
diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index 2ae7ba4..473cecd 100644
--- a/target/mips/cpu.c
+++ b/target/mips/cpu.c
@@ -551,6 +551,7 @@ static int mips_cpu_mmu_index(CPUState *cs, bool ifunc)
 }
 
 static const TCGCPUOps mips_tcg_ops = {
+    .mttcg_supported = TARGET_LONG_BITS == 32,
     .guest_default_memory_order = 0,
 
     .initialize = mips_tcg_init,
diff --git a/target/openrisc/cpu.c b/target/openrisc/cpu.c
index 87fe779..6601e0c 100644
--- a/target/openrisc/cpu.c
+++ b/target/openrisc/cpu.c
@@ -244,6 +244,7 @@ static const struct SysemuCPUOps openrisc_sysemu_ops = {
 
 static const TCGCPUOps openrisc_tcg_ops = {
     .guest_default_memory_order = 0,
+    .mttcg_supported = true,
 
     .initialize = openrisc_translate_init,
     .translate_code = openrisc_translate_code,
diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index 9ba7759..fde7d71 100644
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -7479,6 +7479,7 @@ static const struct SysemuCPUOps ppc_sysemu_ops = {
 #include "accel/tcg/cpu-ops.h"
 
 static const TCGCPUOps ppc_tcg_ops = {
+  .mttcg_supported = TARGET_LONG_BITS == 64,
   .guest_default_memory_order = 0,
   .initialize = ppc_translate_init,
   .translate_code = ppc_translate_code,
diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
index 44fdf6c..426145c 100644
--- a/target/riscv/tcg/tcg-cpu.c
+++ b/target/riscv/tcg/tcg-cpu.c
@@ -141,6 +141,7 @@ static void riscv_restore_state_to_opc(CPUState *cs,
 }
 
 const TCGCPUOps riscv_tcg_ops = {
+    .mttcg_supported = true,
     .guest_default_memory_order = 0,
 
     .initialize = riscv_translate_init,
diff --git a/target/rx/cpu.c b/target/rx/cpu.c
index f073fe8..0a7a2b5 100644
--- a/target/rx/cpu.c
+++ b/target/rx/cpu.c
@@ -206,6 +206,7 @@ static const struct SysemuCPUOps rx_sysemu_ops = {
 static const TCGCPUOps rx_tcg_ops = {
     /* MTTCG not yet supported: require strict ordering */
     .guest_default_memory_order = TCG_MO_ALL,
+    .mttcg_supported = false,
 
     .initialize = rx_translate_init,
     .translate_code = rx_translate_code,
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index 1e101b5..41cccc1 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -345,6 +345,7 @@ void cpu_get_tb_cpu_state(CPUS390XState *env, vaddr *pc,
 }
 
 static const TCGCPUOps s390_tcg_ops = {
+    .mttcg_supported = true,
     /*
      * The z/Architecture has a strong memory model with some
      * store-after-load re-ordering.
diff --git a/target/sh4/cpu.c b/target/sh4/cpu.c
index 7a05301..861fdd4 100644
--- a/target/sh4/cpu.c
+++ b/target/sh4/cpu.c
@@ -264,6 +264,7 @@ static const struct SysemuCPUOps sh4_sysemu_ops = {
 static const TCGCPUOps superh_tcg_ops = {
     /* MTTCG not yet supported: require strict ordering */
     .guest_default_memory_order = TCG_MO_ALL,
+    .mttcg_supported = false,
 
     .initialize = sh4_translate_init,
     .translate_code = sh4_translate_code,
diff --git a/target/sparc/cpu.c b/target/sparc/cpu.c
index 56d9417..f7d231c 100644
--- a/target/sparc/cpu.c
+++ b/target/sparc/cpu.c
@@ -1023,6 +1023,7 @@ static const TCGCPUOps sparc_tcg_ops = {
      *   by an implied MEMBAR #StoreStore.
      */
     .guest_default_memory_order = TCG_MO_LD_LD | TCG_MO_LD_ST | TCG_MO_ST_ST,
+    .mttcg_supported = true,
 
     .initialize = sparc_tcg_init,
     .translate_code = sparc_translate_code,
diff --git a/target/tricore/cpu.c b/target/tricore/cpu.c
index c68954b..a4f93e7 100644
--- a/target/tricore/cpu.c
+++ b/target/tricore/cpu.c
@@ -174,6 +174,7 @@ static const struct SysemuCPUOps tricore_sysemu_ops = {
 static const TCGCPUOps tricore_tcg_ops = {
     /* MTTCG not yet supported: require strict ordering */
     .guest_default_memory_order = TCG_MO_ALL,
+    .mttcg_supported = false,
     .initialize = tricore_tcg_init,
     .translate_code = tricore_translate_code,
     .synchronize_from_tb = tricore_cpu_synchronize_from_tb,
diff --git a/target/xtensa/cpu.c b/target/xtensa/cpu.c
index 2cbf4e3..971e67a 100644
--- a/target/xtensa/cpu.c
+++ b/target/xtensa/cpu.c
@@ -234,6 +234,7 @@ static const struct SysemuCPUOps xtensa_sysemu_ops = {
 static const TCGCPUOps xtensa_tcg_ops = {
     /* Xtensa processors have a weak memory model */
     .guest_default_memory_order = 0,
+    .mttcg_supported = true,
 
     .initialize = xtensa_translate_init,
     .translate_code = xtensa_translate_code,