[Qemu-devel] [PCTCH v2 2/2] query-command-line-options: query all the options in qemu-options.hx

[Amos Kong <akong@redhat.com>]

vm_config_groups[] only contains part of the options which have
argument, and all options which have no argument isn't added to
vm_config_groups[]. Current query-command-line-options only
checkes options from vm_config_groups[], so some options will
be lost.

We have some macros in qemu-options.hx to generate a table that
contains all the options. This patch tries to query options from
the table.

Then we won't lost the legacy options that weren't added to
vm_config_groups[]. The options have no argument will also be
returned (eg: -enable-fips)

Some options that have argument have a NULL desc list, some
options don't have argument, and "parameters" is mandatory
in the past. So we add a new field "arguments" to present
if the option takes unspecified arguments.

Signed-off-by: Amos Kong <akong@redhat.com>
---
 qapi-schema.json   |  8 ++++++--
 util/qemu-config.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 52 insertions(+), 8 deletions(-)

diff --git a/qapi-schema.json b/qapi-schema.json
index 05ced9d..0bd8e12 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3944,12 +3944,16 @@
 #
 # @option: option name
 #
-# @parameters: an array of @CommandLineParameterInfo
+# @parameters: array of @CommandLineParameterInfo, possibly empty
+# @argument: @optional present if the @parameters array is empty. If
+#            true, then the option takes unspecified arguments, if
+#            false, then the option is merely a boolean flag (since 2.0)
 #
 # Since 1.5
 ##
 { 'type': 'CommandLineOptionInfo',
-  'data': { 'option': 'str', 'parameters': ['CommandLineParameterInfo'] } }
+  'data': { 'option': 'str', 'parameters': ['CommandLineParameterInfo'],
+            '*argument': 'bool' } }
 
 ##
 # @query-command-line-options:
diff --git a/util/qemu-config.c b/util/qemu-config.c
index d624d92..c9c8732 100644
--- a/util/qemu-config.c
+++ b/util/qemu-config.c
@@ -6,6 +6,8 @@
 #include "hw/qdev.h"
 #include "qapi/error.h"
 #include "qmp-commands.h"
+#include "sysemu/arch_init.h"
+#include "qemu-options.h"
 
 static QemuOptsList *vm_config_groups[32];
 static QemuOptsList *drive_config_groups[4];
@@ -78,6 +80,17 @@ static CommandLineParameterInfoList *get_param_infolist(const QemuOptDesc *desc)
     return param_list;
 }
 
+static int get_group_index(const char *name)
+{
+    int i;
+
+    for (i = 0; vm_config_groups[i] != NULL; i++) {
+        if (!strcmp(vm_config_groups[i]->name, name)) {
+            return i;
+        }
+    }
+    return -1;
+}
 /* remove repeated entry from the info list */
 static void cleanup_infolist(CommandLineParameterInfoList *head)
 {
@@ -131,6 +144,15 @@ static CommandLineParameterInfoList *get_drive_infolist(void)
     return head;
 }
 
+#define HAS_ARG 0x0001
+
+typedef struct QEMUOption {
+    const char *name;
+    int flags;
+    int index;
+    uint32_t arch_mask;
+} QEMUOption;
+
 CommandLineOptionInfoList *qmp_query_command_line_options(bool has_option,
                                                           const char *option,
                                                           Error **errp)
@@ -139,15 +161,33 @@ CommandLineOptionInfoList *qmp_query_command_line_options(bool has_option,
     CommandLineOptionInfo *info;
     int i;
 
-    for (i = 0; vm_config_groups[i] != NULL; i++) {
-        if (!has_option || !strcmp(option, vm_config_groups[i]->name)) {
+    static const QEMUOption qemu_options[] = {
+        { "h", 0, QEMU_OPTION_h, QEMU_ARCH_ALL },
+#define QEMU_OPTIONS_GENERATE_OPTIONS
+#include "qemu-options-wrapper.h"
+        { NULL },
+    };
+
+    for (i = 0; qemu_options[i].name; i++) {
+        if (!has_option || !strcmp(option, qemu_options[i].name)) {
             info = g_malloc0(sizeof(*info));
-            info->option = g_strdup(vm_config_groups[i]->name);
-            if (!strcmp("drive", vm_config_groups[i]->name)) {
+            info->option = g_strdup(qemu_options[i].name);
+
+            int idx = get_group_index(qemu_options[i].name);
+
+            if (qemu_options[i].flags) {
+                info->argument = true;
+            }
+
+            if (!strcmp("drive", qemu_options[i].name)) {
                 info->parameters = get_drive_infolist();
-            } else {
+            } else if (idx >= 0) {
                 info->parameters =
-                    get_param_infolist(vm_config_groups[i]->desc);
+                    get_param_infolist(vm_config_groups[idx]->desc);
+            }
+
+            if (!info->parameters) {
+                info->has_argument = true;
             }
             entry = g_malloc0(sizeof(*entry));
             entry->value = info;
-- 
1.8.5.3