[PATCH v6 05/11] target/arm: Restrict ARMv6 cpus to TCG accel

[Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>]

KVM requires the target cpu to be at least ARMv8 architecture
(support on ARMv7 has been dropped in commit 82bf7ae84ce:
"target/arm: Remove KVM support for 32-bit Arm hosts").

Only enable the following ARMv6 CPUs when TCG is available:

  - ARM1136
  - ARM1176
  - ARM11MPCore
  - Cortex-M0

The following machines are no more built when TCG is disabled:

  - kzm                  ARM KZM Emulation Baseboard (ARM1136)
  - microbit             BBC micro:bit (Cortex-M0)
  - n800                 Nokia N800 tablet aka. RX-34 (OMAP2420)
  - n810                 Nokia N810 tablet aka. RX-44 (OMAP2420)
  - realview-eb-mpcore   ARM RealView Emulation Baseboard (ARM11MPCore)

Signed-off-by: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
---
 default-configs/devices/arm-softmmu.mak | 2 --
 hw/arm/realview.c                       | 2 +-
 tests/qtest/cdrom-test.c                | 2 +-
 hw/arm/Kconfig                          | 6 ++++++
 target/arm/Kconfig                      | 4 ++++
 5 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/default-configs/devices/arm-softmmu.mak b/default-configs/devices/arm-softmmu.mak
index 0aad35da0c4..175530595ce 100644
--- a/default-configs/devices/arm-softmmu.mak
+++ b/default-configs/devices/arm-softmmu.mak
@@ -10,9 +10,7 @@ CONFIG_ARM_VIRT=y
 CONFIG_CUBIEBOARD=y
 CONFIG_EXYNOS4=y
 CONFIG_HIGHBANK=y
-CONFIG_FSL_IMX31=y
 CONFIG_MUSCA=y
-CONFIG_NSERIES=y
 CONFIG_STELLARIS=y
 CONFIG_REALVIEW=y
 CONFIG_VEXPRESS=y
diff --git a/hw/arm/realview.c b/hw/arm/realview.c
index 2dcf0a4c23e..0606d22da14 100644
--- a/hw/arm/realview.c
+++ b/hw/arm/realview.c
@@ -463,8 +463,8 @@ static void realview_machine_init(void)
 {
     if (tcg_builtin()) {
         type_register_static(&realview_eb_type);
+        type_register_static(&realview_eb_mpcore_type);
     }
-    type_register_static(&realview_eb_mpcore_type);
     type_register_static(&realview_pb_a8_type);
     type_register_static(&realview_pbx_a9_type);
 }
diff --git a/tests/qtest/cdrom-test.c b/tests/qtest/cdrom-test.c
index 1f1bc26fa7a..cb0409c5a11 100644
--- a/tests/qtest/cdrom-test.c
+++ b/tests/qtest/cdrom-test.c
@@ -224,8 +224,8 @@ int main(int argc, char **argv)
         const char *armmachines[] = {
 #ifdef CONFIG_TCG
             "realview-eb",
-#endif /* CONFIG_TCG */
             "realview-eb-mpcore",
+#endif /* CONFIG_TCG */
             "realview-pb-a8",
             "realview-pbx-a9", "versatileab", "versatilepb", "vexpress-a15",
             "vexpress-a9", "virt", NULL
diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 560442bfc5c..6c4bce4d637 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -123,6 +123,8 @@ config NETDUINOPLUS2
 
 config NSERIES
     bool
+    default y if TCG && ARM
+    select ARM_V6
     select OMAP
     select TMP105   # tempature sensor
     select BLIZZARD # LCD/TV controller
@@ -401,6 +403,8 @@ config FSL_IMX25
 
 config FSL_IMX31
     bool
+    default y if TCG && ARM
+    select ARM_V6
     select SERIAL
     select IMX
     select IMX_I2C
@@ -478,11 +482,13 @@ config FSL_IMX6UL
 
 config MICROBIT
     bool
+    default y if TCG && ARM
     select NRF51_SOC
 
 config NRF51_SOC
     bool
     select I2C
+    select ARM_V6
     select ARM_V7M
     select UNIMP
 
diff --git a/target/arm/Kconfig b/target/arm/Kconfig
index 9b3635617dc..fbb7bba9018 100644
--- a/target/arm/Kconfig
+++ b/target/arm/Kconfig
@@ -14,6 +14,10 @@ config ARM_V5
     bool
     depends on TCG && ARM
 
+config ARM_V6
+    bool
+    depends on TCG && ARM
+
 config ARM_V7M
     bool
     select PTIMER
-- 
2.26.2