accel/hvf: Have PSCI CPU_SUSPEND halt the vCPU

Return EXCP_HLT to the main loop.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Message-ID: <20260112103034.65310-15-philmd@linaro.org>

target/arm/hvf/hvf.c

@@ -301,8 +301,6 @@ void hvf_arm_init_debug(void)
 #define TMR_CTL_IMASK   (1 << 1)
 #define TMR_CTL_ISTATUS (1 << 2)
 
-static int hvf_wfi(CPUState *cpu);
-
 static uint32_t chosen_ipa_bit_size;
 
 typedef struct HVFVTimer {
@@ -1008,7 +1006,7 @@ static void hvf_psci_cpu_off(ARMCPU *arm_cpu)
  * Returns 0 on success
  *         -1 when the PSCI call is unknown,
  */
-static bool hvf_handle_psci_call(CPUState *cpu)
+static bool hvf_handle_psci_call(CPUState *cpu, int *excp_ret)
 {
     ARMCPU *arm_cpu = ARM_CPU(cpu);
     CPUARMState *env = &arm_cpu->env;
@@ -1091,9 +1089,8 @@ static bool hvf_handle_psci_call(CPUState *cpu)
             ret = QEMU_PSCI_RET_INVALID_PARAMS;
             break;
         }
-        /* Powerdown is not supported, we always go into WFI */
         env->xregs[0] = 0;
-        hvf_wfi(cpu);
+        *excp_ret = EXCP_HLT;
         break;
     case QEMU_PSCI_0_1_FN_MIGRATE:
     case QEMU_PSCI_0_2_FN_MIGRATE:
@@ -1910,7 +1907,7 @@ static int hvf_handle_exception(CPUState *cpu, hv_vcpu_exit_exception_t *excp)
         cpu_synchronize_state(cpu);
         if (arm_cpu->psci_conduit == QEMU_PSCI_CONDUIT_HVC) {
             /* Do NOT advance $pc for HVC */
-            if (!hvf_handle_psci_call(cpu)) {
+            if (!hvf_handle_psci_call(cpu, &ret)) {
                 trace_hvf_unknown_hvc(env->pc, env->xregs[0]);
                 /* SMCCC 1.3 section 5.2 says every unknown SMCCC call returns -1 */
                 env->xregs[0] = -1;
@@ -1927,7 +1924,7 @@ static int hvf_handle_exception(CPUState *cpu, hv_vcpu_exit_exception_t *excp)
             /* Secure Monitor Call exception, we need to advance $pc */
             advance_pc = true;
 
-            if (!hvf_handle_psci_call(cpu)) {
+            if (!hvf_handle_psci_call(cpu, &ret)) {
                 trace_hvf_unknown_smc(env->xregs[0]);
                 /* SMCCC 1.3 section 5.2 says every unknown SMCCC call returns -1 */
                 env->xregs[0] = -1;