[PULL 15/18] target/arm: Access PSCI state atomically

["Philippe Mathieu-Daudé" <philmd@oss.qualcomm.com>]

Use qatomic_set() when updating ARMCPU::power_state and
CPUARMState::halt_reason. Read ARMCPU::power_state atomically in
arm_cpu_has_work(), which can run without the BQL held.

Signed-off-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20260923171116.31276-9-philmd@oss.qualcomm.com>
---
 target/arm/arm-powerctl.c | 4 ++--
 target/arm/cpu.c          | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/target/arm/arm-powerctl.c b/target/arm/arm-powerctl.c
index 213e7ae056c..ef14a1f8a94 100644
--- a/target/arm/arm-powerctl.c
+++ b/target/arm/arm-powerctl.c
@@ -49,8 +49,8 @@ void arm_set_cpu_power_state(ARMCPU *cpu, ARMPSCIState state)
 {
     CPUARMState *env = &cpu->env;
 
-    cpu->power_state = state;
-    env->halt_reason = state == PSCI_OFF ? HALT_PSCI : NOT_HALTED;
+    qatomic_set(&cpu->power_state, state);
+    qatomic_set(&env->halt_reason, state == PSCI_OFF ? HALT_PSCI : NOT_HALTED);
 }
 
 static void arm_set_cpu_on_async_work(CPUState *target_cpu_state,
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 76aa47ac503..5cfd3bcfc8e 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -149,7 +149,7 @@ static bool arm_cpu_has_work(CPUState *cs)
      * Only another PSCI call can wake the CPU up in which case the
      * power_state would be set by arm_set_cpu_on_and_reset_async_work()
      */
-    if (cpu->power_state == PSCI_OFF) {
+    if (qatomic_read(&cpu->power_state) == PSCI_OFF) {
         g_assert(cpu->env.halt_reason == HALT_PSCI);
         return false;
     }
-- 
2.53.0