[Qemu-arm] [PATCH 05/13] arm: Don't clear ARM_FEATURE_PMSA for no-mpu configs

[Peter Maydell]

Fix the handling of QOM properties for PMSA CPUs with no MPU:

Allow no-MPU to be specified by either:
 * has-mpu = false
 * pmsav7_dregion = 0
and make setting one imply the other. Don't clear the PMSA
feature bit in this situation.

Signed-off-by: Peter Maydell <address@hidden>
---
 target/arm/cpu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index f17e279..8e57498 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -757,8 +757,14 @@ static void arm_cpu_realizefn(DeviceState *dev, Error 
**errp)
         cpu->id_pfr1 &= ~0xf000;
     }
 
+    /* MPU can be configured out of a PMSA CPU either by setting has-mpu
+     * to false or by setting pmsav7-dregion to 0.
+     */
     if (!cpu->has_mpu) {
-        unset_feature(ARM_FEATURE_PMSA);
+        cpu->pmsav7_dregion = 0;
+    }
+    if (cpu->pmsav7_dregion == 0) {
+        cpu->has_mpu = false;
     }
 
     if (arm_feature(env, ARM_FEATURE_PMSA) &&
-- 
2.7.4