system/cpu-timers: Have icount_configure() return a boolean

Following the example documented since commit e3fe3988d7 ("error:
Document Error API usage rules"), have icount_configure()
return a boolean indicating whether an error is set or not.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231208113529.74067-2-philmd@linaro.org>

accel/tcg/icount-common.c

@@ -419,7 +419,7 @@ void icount_account_warp_timer(void)
     icount_warp_rt();
 }
 
-void icount_configure(QemuOpts *opts, Error **errp)
+bool icount_configure(QemuOpts *opts, Error **errp)
 {
     const char *option = qemu_opt_get(opts, "shift");
     bool sleep = qemu_opt_get_bool(opts, "sleep", true);
@@ -429,27 +429,28 @@ void icount_configure(QemuOpts *opts, Error **errp)
     if (!option) {
         if (qemu_opt_get(opts, "align") != NULL) {
             error_setg(errp, "Please specify shift option when using align");
+            return false;
         }
-        return;
+        return true;
     }
 
     if (align && !sleep) {
         error_setg(errp, "align=on and sleep=off are incompatible");
-        return;
+        return false;
     }
 
     if (strcmp(option, "auto") != 0) {
         if (qemu_strtol(option, NULL, 0, &time_shift) < 0
             || time_shift < 0 || time_shift > MAX_ICOUNT_SHIFT) {
             error_setg(errp, "icount: Invalid shift value");
-            return;
+            return false;
         }
     } else if (icount_align_option) {
         error_setg(errp, "shift=auto and align=on are incompatible");
-        return;
+        return false;
     } else if (!icount_sleep) {
         error_setg(errp, "shift=auto and sleep=off are incompatible");
-        return;
+        return false;
     }
 
     icount_sleep = sleep;
@@ -463,7 +464,7 @@ void icount_configure(QemuOpts *opts, Error **errp)
     if (time_shift >= 0) {
         timers_state.icount_time_shift = time_shift;
         icount_enable_precise();
-        return;
+        return true;
     }
 
     icount_enable_adaptive();
@@ -491,6 +492,7 @@ void icount_configure(QemuOpts *opts, Error **errp)
     timer_mod(timers_state.icount_vm_timer,
                    qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
                    NANOSECONDS_PER_SECOND / 10);
+    return true;
 }
 
 void icount_notify_exit(void)

include/sysemu/cpu-timers.h

@@ -50,8 +50,14 @@ int64_t icount_get(void);
  */
 int64_t icount_to_ns(int64_t icount);
 
-/* configure the icount options, including "shift" */
-void icount_configure(QemuOpts *opts, Error **errp);
+/**
+ * icount_configure: configure the icount options, including "shift"
+ * @opts: Options to parse
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Return: true on success, else false setting @errp with error
+ */
+bool icount_configure(QemuOpts *opts, Error **errp);
 
 /* used by tcg vcpu thread to calc icount budget */
 int64_t icount_round(int64_t count);

stubs/icount.c

@@ -10,10 +10,12 @@ void icount_update(CPUState *cpu)
 {
     abort();
 }
-void icount_configure(QemuOpts *opts, Error **errp)
+bool icount_configure(QemuOpts *opts, Error **errp)
 {
     /* signal error */
     error_setg(errp, "cannot configure icount, TCG support not available");
+
+    return false;
 }
 int64_t icount_get_raw(void)
 {

system/vl.c

@@ -2270,8 +2270,7 @@ static void user_register_global_props(void)
 
 static int do_configure_icount(void *opaque, QemuOpts *opts, Error **errp)
 {
-    icount_configure(opts, errp);
-    return 0;
+    return !icount_configure(opts, errp);
 }
 
 static int accelerator_set_property(void *opaque,