[RFC PATCH v5 8/9] arm/Kconfig: Always select SEMIHOSTING when TCG is present

[Fabiano Rosas <farosas@suse.de>]

We are about to enable the build without TCG, so CONFIG_SEMIHOSTING
and CONFIG_ARM_COMPATIBLE_SEMIHOSTING cannot be unconditionally set in
default.mak anymore. So reflect the change in a Kconfig.

Instead of using semihosting/Kconfig, use a target-specific file, so
that the change doesn't affect other architectures which might
implement semihosting in a way compatible with KVM.

The selection from ARM_v7M needs to be removed to avoid a cycle during
parsing.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 configs/devices/arm-softmmu/default.mak | 2 --
 hw/arm/Kconfig                          | 1 -
 target/arm/Kconfig                      | 7 +++++++
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/configs/devices/arm-softmmu/default.mak b/configs/devices/arm-softmmu/default.mak
index 1b49a7830c..cb3e5aea65 100644
--- a/configs/devices/arm-softmmu/default.mak
+++ b/configs/devices/arm-softmmu/default.mak
@@ -40,6 +40,4 @@ CONFIG_MICROBIT=y
 CONFIG_FSL_IMX25=y
 CONFIG_FSL_IMX7=y
 CONFIG_FSL_IMX6UL=y
-CONFIG_SEMIHOSTING=y
-CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
 CONFIG_ALLWINNER_H3=y
diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 19d6b9d95f..e0da8841db 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -316,7 +316,6 @@ config ARM_V7M
     # currently v7M must be included in a TCG build due to translate.c
     default y if TCG && (ARM || AARCH64)
     select PTIMER
-    select ARM_COMPATIBLE_SEMIHOSTING
 
 config ALLWINNER_A10
     bool
diff --git a/target/arm/Kconfig b/target/arm/Kconfig
index 3f3394a22b..39f05b6420 100644
--- a/target/arm/Kconfig
+++ b/target/arm/Kconfig
@@ -4,3 +4,10 @@ config ARM
 config AARCH64
     bool
     select ARM
+
+# This config exists just so we can make SEMIHOSTING default when TCG
+# is selected without also changing it for other architectures.
+config ARM_SEMIHOSTING
+    bool
+    default y if TCG && ARM
+    select ARM_COMPATIBLE_SEMIHOSTING
-- 
2.35.3