diff --git a/arch_init.c b/arch_init.c
index a9e8b74..e8e6f80 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -602,7 +602,7 @@ void select_soundhw(const char *optarg)
 {
     struct soundhw *c;
 
-    if (*optarg == '?') {
+    if (is_help_option(optarg)) {
     show_valid_cards:
 
         printf("Valid sound card names (comma separated):\n");
@@ -610,7 +610,7 @@ void select_soundhw(const char *optarg)
             printf ("%-11s %s\n", c->name, c->descr);
         }
         printf("\n-soundhw all will enable all of the above\n");
-        exit(*optarg != '?');
+        exit(!is_help_option(optarg));
     }
     else {
         size_t l;
diff --git a/blockdev.c b/blockdev.c
index 9e0a72a..7810cd7 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -398,11 +398,11 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
 #endif
 
     if ((buf = qemu_opt_get(opts, "format")) != NULL) {
-       if (strcmp(buf, "?") == 0) {
-           error_printf("Supported formats:");
-           bdrv_iterate_format(bdrv_format_print, NULL);
-           error_printf("\n");
-           return NULL;
+        if (is_help_option(buf)) {
+            error_printf("Supported formats:");
+            bdrv_iterate_format(bdrv_format_print, NULL);
+            error_printf("\n");
+            return NULL;
         }
         drv = bdrv_find_whitelisted_format(buf);
         if (!drv) {
diff --git a/bsd-user/main.c b/bsd-user/main.c
index cd33d65..0aad752 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -681,7 +681,7 @@ static void usage(void)
            "-g port           wait gdb connection to port\n"
            "-L path           set the elf interpreter prefix (default=%s)\n"
            "-s size           set the stack size in bytes (default=%ld)\n"
-           "-cpu model        select CPU (-cpu ? for list)\n"
+           "-cpu model        select CPU (-cpu help for list)\n"
            "-drop-ld-preload  drop LD_PRELOAD for target process\n"
            "-E var=value      sets/modifies targets environment variable(s)\n"
            "-U var            unsets targets environment variable(s)\n"
@@ -825,8 +825,8 @@ int main(int argc, char **argv)
             qemu_uname_release = argv[optind++];
         } else if (!strcmp(r, "cpu")) {
             cpu_model = argv[optind++];
-            if (strcmp(cpu_model, "?") == 0) {
-/* XXX: implement xxx_cpu_list for targets that still miss it */
+            if (is_help_option(cpu_model)) {
+                /* XXX: implement xxx_cpu_list for targets that still miss it */
 #if defined(cpu_list)
                     cpu_list(stdout, &fprintf);
 #endif
diff --git a/hw/mips_jazz.c b/hw/mips_jazz.c
index bf1b799..db927f1 100644
--- a/hw/mips_jazz.c
+++ b/hw/mips_jazz.c
@@ -239,7 +239,7 @@ static void mips_jazz_init(MemoryRegion *address_space,
             dp83932_init(nd, 0x80001000, 2, get_system_memory(), rc4030[4],
                          rc4030_opaque, rc4030_dma_memory_rw);
             break;
-        } else if (strcmp(nd->model, "?") == 0) {
+        } else if (is_help_option(nd->model)) {
             fprintf(stderr, "qemu: Supported NICs: dp83932\n");
             exit(1);
         } else {
diff --git a/hw/qdev-monitor.c b/hw/qdev-monitor.c
index 7915b45..d777a20 100644
--- a/hw/qdev-monitor.c
+++ b/hw/qdev-monitor.c
@@ -138,7 +138,7 @@ int qdev_device_help(QemuOpts *opts)
     ObjectClass *klass;
 
     driver = qemu_opt_get(opts, "driver");
-    if (driver && !strcmp(driver, "?")) {
+    if (driver && is_help_option(driver)) {
         bool show_no_user = false;
         object_class_foreach(qdev_print_devinfo, TYPE_DEVICE, false, &show_no_user);
         return 1;
diff --git a/hw/watchdog.c b/hw/watchdog.c
index a42124d..b52aced 100644
--- a/hw/watchdog.c
+++ b/hw/watchdog.c
@@ -55,7 +55,7 @@ int select_watchdog(const char *p)
     QemuOpts *opts;
 
     /* -watchdog ? lists available devices and exits cleanly. */
-    if (strcmp(p, "?") == 0) {
+    if (is_help_option(p)) {
         QLIST_FOREACH(model, &watchdog_list, entry) {
             fprintf(stderr, "\t%s\t%s\n",
                      model->wdt_name, model->wdt_description);
diff --git a/linux-user/main.c b/linux-user/main.c
index d0e0e4f..3f0ee33 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3053,7 +3053,7 @@ static void handle_arg_uname(const char *arg)
 static void handle_arg_cpu(const char *arg)
 {
     cpu_model = strdup(arg);
-    if (cpu_model == NULL || strcmp(cpu_model, "?") == 0) {
+    if (cpu_model == NULL || is_help_option(cpu_model)) {
         /* XXX: implement xxx_cpu_list for targets that still miss it */
 #if defined(cpu_list_id)
         cpu_list_id(stdout, &fprintf, "");
@@ -3144,7 +3144,7 @@ struct qemu_argument arg_table[] = {
     {"s",          "QEMU_STACK_SIZE",  true,  handle_arg_stack_size,
      "size",       "set the stack size to 'size' bytes"},
     {"cpu",        "QEMU_CPU",         true,  handle_arg_cpu,
-     "model",      "select CPU (-cpu ? for list)"},
+     "model",      "select CPU (-cpu help for list)"},
     {"E",          "QEMU_SET_ENV",     true,  handle_arg_set_env,
      "var=value",  "sets targets environment variable (see below)"},
     {"U",          "QEMU_UNSET_ENV",   true,  handle_arg_unset_env,
diff --git a/net.c b/net.c
index 4aa416c..2e6b405 100644
--- a/net.c
+++ b/net.c
@@ -688,8 +688,9 @@ int qemu_show_nic_models(const char *arg, const char *const *models)
 {
     int i;
 
-    if (!arg || strcmp(arg, "?"))
+    if (!arg || !is_help_option(arg)) {
         return 0;
+    }
 
     fprintf(stderr, "qemu: Supported NIC models: ");
     for (i = 0 ; models[i]; i++)
diff --git a/qemu-common.h b/qemu-common.h
index 9d9e603..fa1edb8 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -135,6 +135,22 @@ int qemu_main(int argc, char **argv, char **envp);
 void qemu_get_timedate(struct tm *tm, int offset);
 int qemu_timedate_diff(struct tm *tm);
 
+/**
+ * is_help_option:
+ * @s: string to test
+ *
+ * Check whether @s is one of the standard strings which indicate
+ * that the user is asking for a list of the valid values for a
+ * command option like -cpu or -M. The current accepted strings
+ * are 'help' and '?'.
+ *
+ * Returns: true if @s is a request for a list.
+ */
+static inline bool is_help_option(const char *s)
+{
+    return !strcmp(s, "?") || !strcmp(s, "help");
+}
+
 /* cutils.c */
 void pstrcpy(char *buf, int buf_size, const char *str);
 char *pstrcat(char *buf, int buf_size, const char *s);
diff --git a/qemu-doc.texi b/qemu-doc.texi
index 0af0ff4..140b650 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -2390,7 +2390,7 @@ Set the x86 elf interpreter prefix (default=/usr/local/qemu-i386)
 @item -s size
 Set the x86 stack size in bytes (default=524288)
 @item -cpu model
-Select CPU model (-cpu ? for list and additional feature selection)
+Select CPU model (-cpu help for list and additional feature selection)
 @item -ignore-environment
 Start with an empty environment. Without this option,
 the initial environment is a copy of the caller's environment.
diff --git a/qemu-ga.c b/qemu-ga.c
index 8199da7..f1a39ec 100644
--- a/qemu-ga.c
+++ b/qemu-ga.c
@@ -736,7 +736,7 @@ int main(int argc, char **argv)
             break;
         case 'b': {
             char **list_head, **list;
-            if (*optarg == '?') {
+            if (is_help_option(optarg)) {
                 list_head = list = qmp_get_command_list();
                 while (*list != NULL) {
                     printf("%s\n", *list);
diff --git a/qemu-img.c b/qemu-img.c
index 80cfb9b..b866f80 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -350,7 +350,7 @@ static int img_create(int argc, char **argv)
         img_size = (uint64_t)sval;
     }
 
-    if (options && !strcmp(options, "?")) {
+    if (options && is_help_option(options)) {
         ret = print_block_option_help(filename, fmt);
         goto out;
     }
@@ -744,7 +744,7 @@ static int img_convert(int argc, char **argv)
     /* Initialize before goto out */
     qemu_progress_init(progress, 2.0);
 
-    if (options && !strcmp(options, "?")) {
+    if (options && is_help_option(options)) {
         ret = print_block_option_help(out_filename, out_fmt);
         goto out;
     }
diff --git a/qemu-options.hx b/qemu-options.hx
index 8b66264..eba1ec2 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -29,7 +29,7 @@ ETEXI
 
 DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
     "-machine [type=]name[,prop[=value][,...]]\n"
-    "                selects emulated machine (-machine ? for list)\n"
+    "                selects emulated machine (-machine help for list)\n"
     "                property accel=accel1[:accel2[:...]] selects accelerator\n"
     "                supported accelerators are kvm, xen, tcg (default: tcg)\n"
     "                kernel_irqchip=on|off controls accelerated irqchip support\n"
@@ -38,7 +38,7 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
 STEXI
 @item -machine [type=]@var{name}[,prop=@var{value}[,...]]
 @findex -machine
-Select the emulated machine by @var{name}. Use @code{-machine ?} to list
+Select the emulated machine by @var{name}. Use @code{-machine help} to list
 available machines. Supported machine properties are:
 @table @option
 @item accel=@var{accels1}[:@var{accels2}[:...]]
@@ -57,11 +57,11 @@ HXCOMM Deprecated by -machine
 DEF("M", HAS_ARG, QEMU_OPTION_M, "", QEMU_ARCH_ALL)
 
 DEF("cpu", HAS_ARG, QEMU_OPTION_cpu,
-    "-cpu cpu        select CPU (-cpu ? for list)\n", QEMU_ARCH_ALL)
+    "-cpu cpu        select CPU (-cpu help for list)\n", QEMU_ARCH_ALL)
 STEXI
 @item -cpu @var{model}
 @findex -cpu
-Select CPU model (-cpu ? for list and additional feature selection)
+Select CPU model (-cpu help for list and additional feature selection)
 ETEXI
 
 DEF("smp", HAS_ARG, QEMU_OPTION_smp,
@@ -445,12 +445,12 @@ ETEXI
 DEF("soundhw", HAS_ARG, QEMU_OPTION_soundhw,
     "-soundhw c1,... enable audio support\n"
     "                and only specified sound cards (comma separated list)\n"
-    "                use -soundhw ? to get the list of supported cards\n"
+    "                use -soundhw help to get the list of supported cards\n"
     "                use -soundhw all to enable all of them\n", QEMU_ARCH_ALL)
 STEXI
 @item -soundhw @var{card1}[,@var{card2},...] or -soundhw all
 @findex -soundhw
-Enable audio and selected sound hardware. Use ? to print all
+Enable audio and selected sound hardware. Use 'help' to print all
 available sound hardware.
 
 @example
@@ -459,7 +459,7 @@ qemu-system-i386 -soundhw es1370 disk.img
 qemu-system-i386 -soundhw ac97 disk.img
 qemu-system-i386 -soundhw hda disk.img
 qemu-system-i386 -soundhw all disk.img
-qemu-system-i386 -soundhw ?
+qemu-system-i386 -soundhw help
 @end example
 
 Note that Linux's i810_audio OSS kernel (for AC97) module might
@@ -548,16 +548,16 @@ DEF("device", HAS_ARG, QEMU_OPTION_device,
     "-device driver[,prop[=value][,...]]\n"
     "                add device (based on driver)\n"
     "                prop=value,... sets driver properties\n"
-    "                use -device ? to print all possible drivers\n"
-    "                use -device driver,? to print all possible properties\n",
+    "                use -device help to print all possible drivers\n"
+    "                use -device driver,help to print all possible properties\n",
     QEMU_ARCH_ALL)
 STEXI
 @item -device @var{driver}[,@var{prop}[=@var{value}][,...]]
 @findex -device
 Add device @var{driver}.  @var{prop}=@var{value} sets driver
 properties.  Valid properties depend on the driver.  To get help on
-possible drivers and properties, use @code{-device ?} and
-@code{-device @var{driver},?}.
+possible drivers and properties, use @code{-device help} and
+@code{-device @var{driver},help}.
 ETEXI
 
 DEFHEADING()
@@ -1315,7 +1315,7 @@ Valid values for @var{type} are
 @code{virtio}, @code{i82551}, @code{i82557b}, @code{i82559er},
 @code{ne2k_pci}, @code{ne2k_isa}, @code{pcnet}, @code{rtl8139},
 @code{e1000}, @code{smc91c111}, @code{lance} and @code{mcf_fec}.
-Not all devices are supported on all targets.  Use -net nic,model=?
+Not all devices are supported on all targets.  Use -net nic,model=help
 for a list of available devices for your target.
 
 @item -net user[,@var{option}][,@var{option}][,...]
@@ -2313,7 +2313,7 @@ Shorthand for -gdb tcp::1234, i.e. open a gdbserver on TCP port 1234
 ETEXI
 
 DEF("d", HAS_ARG, QEMU_OPTION_d, \
-    "-d item1,...    output log to /tmp/qemu.log (use -d ? for a list of log items)\n",
+    "-d item1,...    output log to /tmp/qemu.log (use -d help for a list of log items)\n",
     QEMU_ARCH_ALL)
 STEXI
 @item -d
@@ -2448,13 +2448,13 @@ ETEXI
 
 DEF("clock", HAS_ARG, QEMU_OPTION_clock, \
     "-clock          force the use of the given methods for timer alarm.\n" \
-    "                To see what timers are available use -clock ?\n",
+    "                To see what timers are available use -clock help\n",
     QEMU_ARCH_ALL)
 STEXI
 @item -clock @var{method}
 @findex -clock
 Force the use of the given methods for timer alarm. To see what timers
-are available use -clock ?.
+are available use -clock help.
 ETEXI
 
 HXCOMM Options deprecated by -rtc
@@ -2523,7 +2523,7 @@ watchdog with a single timer, or @code{i6300esb} (Intel 6300ESB I/O
 controller hub) which is a much more featureful PCI-based dual-timer
 watchdog.  Choose a model for which your guest has drivers.
 
-Use @code{-watchdog ?} to list available hardware models.  Only one
+Use @code{-watchdog help} to list available hardware models.  Only one
 watchdog can be enabled for a guest.
 ETEXI
 
diff --git a/qemu-timer.c b/qemu-timer.c
index de98977..062fdf2 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -183,7 +183,7 @@ void configure_alarms(char const *opt)
     char *name;
     struct qemu_alarm_timer tmp;
 
-    if (!strcmp(opt, "?")) {
+    if (is_help_option(opt)) {
         show_available_alarms();
         exit(0);
     }
diff --git a/vl.c b/vl.c
index 1329c30..716fafc 100644
--- a/vl.c
+++ b/vl.c
@@ -2087,7 +2087,7 @@ static QEMUMachine *machine_parse(const char *name)
         printf("%-20s %s%s\n", m->name, m->desc,
                m->is_default ? " (default)" : "");
     }
-    exit(!name || *name != '?');
+    exit(!name || !is_help_option(name));
 }
 
 static int tcg_init(void)
@@ -3217,7 +3217,7 @@ int main(int argc, char **argv, char **envp)
      */
     cpudef_init();
 
-    if (cpu_model && *cpu_model == '?') {
+    if (cpu_model && is_help_option(cpu_model)) {
         list_cpus(stdout, &fprintf, cpu_model);
         exit(0);
     }
