Re: [Qemu-devel] [PATCH v4 2/2] query-command-line-options: query all the options in qemu-options.hx

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On Thu, Mar 20, 2014 at 10:03:12PM +0800, Amos Kong wrote:
> On Fri, Mar 07, 2014 at 10:54:09AM +0100, Markus Armbruster wrote:
> > Eric Blake <eblake@xxxxxxxxxx> writes:
> > 
> > > On 03/05/2014 07:36 PM, Amos Kong wrote:
> > >> vm_config_groups[] only contains part of the options which have
> > >> argument, and all options which have no argument aren't added
> > >> to vm_config_groups[]. Current query-command-line-options only
> > >> checks options from vm_config_groups[], so some options will
> > >> be lost.
> > >> 
> > >> We have macro 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 lose the legacy options that weren't added to
> > >> vm_config_groups[] (eg: -vnc, -smbios). The options that 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 "argument" to present
> > >> if the option takes unspecified arguments.
> > >
> > > I like Markus' suggestion of naming the new field
> > > 'unspecified-parameters' rather than 'argument'.
>  
> Hi Markus,
> 
> > Looking again, there are more problems.
> > 
> > 1. Non-parameter argument vs. parameter argument taking unspecified
> >    parameters
> > 
> >    Example: -device takes unspecified parameters.  -cdrom doesn't take
> >    parameters, it takes a file name.  Yet, the command reports the same
> >    for both: "parameters": [], "argument": true.
> > 
> >    Looks like we need a tri-state: option takes no argument, QemuOpts
> >    argument, or other argument.
> 
> '-cdrom' is the 'other argument' == 'Non-parameter argument'?
> 
> We can use a enum state.
> 
> |  { 'enum': 'ArgumentStateType',
> |    'data': ['no-argument', 'unspecified-parameters-argument',
> |             'non-parameter-argument']
> |  }
> |  
> |  { 'type': 'CommandLineOptionInfo',
> |    'data': { 'option': 'str', 'parameters': ['CommandLineParameterInfo'],
> |              '*argument-state': 'ArgumentStateType' } }

> >    parameters is [] unless it's a QemuOpts argument.  Then it lists the
> >    recognized parameters.
> 
> How about balloon? we should treat as 'taking unspecified parameters'?
> 
>     "-balloon none   disable balloon device\n"
>     "-balloon virtio[,addr=str]\n"

I think we should treat as 'unspecified parameters'
 
> I think we can only check this from help message in qemu-options.hx,
> is it a stable/acceptable method?
> 
> We introduce query-command-line-options command to avoid libvirt to
> check qemu commandline information by scanning qemu's help message,
> it's not strict & stable.


[not a completed patch] 

diff --git a/qemu-options.h b/qemu-options.h
index 4024487..b08a6dc 100644
--- a/qemu-options.h
+++ b/qemu-options.h
@@ -41,6 +41,7 @@ typedef struct QEMUOption {
     const char *name;
     int flags;
     int index;
+    const char *help;
     uint32_t arch_mask;
 } QEMUOption;
 
diff --git a/util/qemu-config.c b/util/qemu-config.c
index 5bc3c31..e7758e3 100644
--- a/util/qemu-config.c
+++ b/util/qemu-config.c
@@ -9,7 +9,8 @@
 #include "qemu-options.h"
 
 const QEMUOption qemu_options[] = {
-    { "h", 0, QEMU_OPTION_h, QEMU_ARCH_ALL },
+    { "h", 0, QEMU_OPTION_h, "-h or -help     display this help and exit\n",
+      QEMU_ARCH_ALL },
 #define QEMU_OPTIONS_GENERATE_OPTIONS
 #include "qemu-options-wrapper.h"
     { NULL },
@@ -147,6 +148,7 @@ CommandLineOptionInfoList *qmp_query_command_line_options(bool has_
     CommandLineOptionInfo *info;
     QemuOptsList *list;
     int i;
+    const char *p;
 
     for (i = 0; qemu_options[i].name; i++) {
         if (!has_option || !strcmp(option, qemu_options[i].name)) {
@@ -161,8 +163,23 @@ CommandLineOptionInfoList *qmp_query_command_line_options(bool has
             }
 
             if (!info->parameters) {
-                info->has_unspecified_parameters = true;
-                info->unspecified_parameters = qemu_options[i].flags & HAS_ARG;
+                info->has_argument_state = true;
+
+                if (!qemu_options[i].flags & HAS_ARG) {
+                    info->argument_state = ARGUMENT_STATE_TYPE_NO_ARGUMENT;
+                } else {
+                    info->argument_state =
+                        ARGUMENT_STATE_TYPE_NO_PARAMETER_ARGUMENT;
+                }
+
+               p = qemu_options[i].help;
+                while (*p) {
+                    if (*p != ' ' && *(p + 1) == '[') {

                              ^^^^^
I know the string matching in while loop is too crude ;-) we can make it strict.

+                        info->argument_state =
+                            ARGUMENT_STATE_TYPE_UNSPECIFIED_PARAMETERS_ARGUMENT;
+                    }
+                    p += 1;
+                }
             }
 
             entry = g_malloc0(sizeof(*entry));



===================== query command output ============

{
    "return": [
        {
            "parameters": [
                {
                    "name": "timestamp", 
                    "type": "boolean"
                }
            ], 
            "option": "msg"
        }, 
        {
            "parameters": [
            ], 
            "option": "object", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "tdf", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-kvm-irqchip", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-kvm-pit", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-kvm-pit-reinjection", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-kvm", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "enable-fips", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "qtest-log", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "qtest", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "file", 
                    "type": "string"
                }, 
                {
                    "name": "events", 
                    "type": "string"
                }
            ], 
            "option": "trace"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-user-config", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "nodefconfig", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "writeconfig", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "readconfig", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "enable", 
                    "type": "boolean"
                }
            ], 
            "option": "sandbox"
        }, 
        {
            "parameters": [
            ], 
            "option": "old-param", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "semihosting", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "prom-env", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "runas", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "chroot", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "nodefaults", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "incoming", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "tb-size", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "show-cursor", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "virtioconsole", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "echr", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "watchdog-action", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "watchdog", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "icount", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "driftfix", 
                    "type": "string"
                }, 
                {
                    "name": "clock", 
                    "type": "string"
                }, 
                {
                    "name": "base", 
                    "type": "string"
                }
            ], 
            "option": "rtc"
        }, 
        {
            "parameters": [
            ], 
            "option": "startdate", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "localtime", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "clock", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "romfile", 
                    "type": "string"
                }, 
                {
                    "name": "bootindex", 
                    "type": "number"
                }
            ], 
            "option": "option-rom"
        }, 
        {
            "parameters": [
            ], 
            "option": "daemonize", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "loadvm", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-shutdown", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-reboot", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "xen-attach", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "xen-create", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "xen-domid", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "enable-kvm", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "bios", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "L", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "D", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "d", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "s", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "gdb", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "mlock", 
                    "type": "boolean"
                }
            ], 
            "option": "realtime"
        }, 
        {
            "parameters": [
            ], 
            "option": "S", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "singlestep", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "pidfile", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "debugcon", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "pretty", 
                    "type": "boolean"
                }, 
                {
                    "name": "default", 
                    "type": "boolean"
                }, 
                {
                    "name": "chardev", 
                    "type": "string"
                }, 
                {
                    "name": "mode", 
                    "type": "string"
                }
            ], 
            "option": "mon"
        }, 
        {
            "parameters": [
            ], 
            "option": "qmp", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "monitor", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "parallel", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "serial", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "dtb", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "initrd", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "append", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "kernel", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "bt", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "initiator-name", 
                    "help": "Initiator iqn name to use when connecting", 
                    "type": "string"
                }, 
                {
                    "name": "header-digest", 
                    "help": "HeaderDigest setting. {CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}", 
                    "type": "string"
                }, 
                {
                    "name": "password", 
                    "help": "password for CHAP authentication to target", 
                    "type": "string"
                }, 
                {
                    "name": "user", 
                    "help": "username for CHAP authentication to target", 
                    "type": "string"
                }
            ], 
            "option": "iscsi"
        }, 
        {
            "parameters": [
                {
                    "name": "chardev", 
                    "type": "string"
                }, 
                {
                    "name": "size", 
                    "type": "size"
                }, 
                {
                    "name": "debug", 
                    "type": "number"
                }, 
                {
                    "name": "name", 
                    "type": "string"
                }, 
                {
                    "name": "signal", 
                    "type": "boolean"
                }, 
                {
                    "name": "mux", 
                    "type": "boolean"
                }, 
                {
                    "name": "rows", 
                    "type": "number"
                }, 
                {
                    "name": "cols", 
                    "type": "number"
                }, 
                {
                    "name": "height", 
                    "type": "number"
                }, 
                {
                    "name": "width", 
                    "type": "number"
                }, 
                {
                    "name": "telnet", 
                    "type": "boolean"
                }, 
                {
                    "name": "delay", 
                    "type": "boolean"
                }, 
                {
                    "name": "server", 
                    "type": "boolean"
                }, 
                {
                    "name": "wait", 
                    "type": "boolean"
                }, 
                {
                    "name": "ipv6", 
                    "type": "boolean"
                }, 
                {
                    "name": "ipv4", 
                    "type": "boolean"
                }, 
                {
                    "name": "to", 
                    "type": "number"
                }, 
                {
                    "name": "localport", 
                    "type": "string"
                }, 
                {
                    "name": "localaddr", 
                    "type": "string"
                }, 
                {
                    "name": "port", 
                    "type": "string"
                }, 
                {
                    "name": "host", 
                    "type": "string"
                }, 
                {
                    "name": "path", 
                    "type": "string"
                }, 
                {
                    "name": "backend", 
                    "type": "string"
                }
            ], 
            "option": "chardev"
        }, 
        {
            "parameters": [
            ], 
            "option": "netdev", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "net", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "smb", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "redir", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "bootp", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "tftp", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "smbios", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "acpitable", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-hpet", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-acpi", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-fd-bootchk", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "rtc-td-hack", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "win2k-hack", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "vnc", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "g", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "full-screen", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "vga", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "rotate", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "portrait", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "seamless-migration", 
                    "type": "boolean"
                }, 
                {
                    "name": "playback-compression", 
                    "type": "boolean"
                }, 
                {
                    "name": "agent-mouse", 
                    "type": "boolean"
                }, 
                {
                    "name": "streaming-video", 
                    "type": "string"
                }, 
                {
                    "name": "zlib-glz-wan-compression", 
                    "type": "string"
                }, 
                {
                    "name": "jpeg-wan-compression", 
                    "type": "string"
                }, 
                {
                    "name": "image-compression", 
                    "type": "string"
                }, 
                {
                    "name": "plaintext-channel", 
                    "type": "string"
                }, 
                {
                    "name": "tls-channel", 
                    "type": "string"
                }, 
                {
                    "name": "tls-ciphers", 
                    "type": "string"
                }, 
                {
                    "name": "x509-dh-key-file", 
                    "type": "string"
                }, 
                {
                    "name": "x509-cacert-file", 
                    "type": "string"
                }, 
                {
                    "name": "x509-cert-file", 
                    "type": "string"
                }, 
                {
                    "name": "x509-key-password", 
                    "type": "string"
                }, 
                {
                    "name": "x509-key-file", 
                    "type": "string"
                }, 
                {
                    "name": "x509-dir", 
                    "type": "string"
                }, 
                {
                    "name": "sasl", 
                    "type": "boolean"
                }, 
                {
                    "name": "disable-agent-file-xfer", 
                    "type": "boolean"
                }, 
                {
                    "name": "disable-copy-paste", 
                    "type": "boolean"
                }, 
                {
                    "name": "disable-ticketing", 
                    "type": "boolean"
                }, 
                {
                    "name": "password", 
                    "type": "string"
                }, 
                {
                    "name": "ipv6", 
                    "type": "boolean"
                }, 
                {
                    "name": "ipv4", 
                    "type": "boolean"
                }, 
                {
                    "name": "addr", 
                    "type": "string"
                }, 
                {
                    "name": "tls-port", 
                    "type": "number"
                }, 
                {
                    "name": "port", 
                    "type": "number"
                }
            ], 
            "option": "spice"
        }, 
        {
            "parameters": [
            ], 
            "option": "sdl", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-quit", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "ctrl-grab", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "alt-grab", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "no-frame", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "curses", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "nographic", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "display", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "usbdevice", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "usb", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "virtfs_synth", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "sock_fd", 
                    "type": "number"
                }, 
                {
                    "name": "socket", 
                    "type": "string"
                }, 
                {
                    "name": "readonly", 
                    "type": "boolean"
                }, 
                {
                    "name": "writeout", 
                    "type": "string"
                }, 
                {
                    "name": "security_model", 
                    "type": "string"
                }, 
                {
                    "name": "mount_tag", 
                    "type": "string"
                }, 
                {
                    "name": "path", 
                    "type": "string"
                }, 
                {
                    "name": "fsdriver", 
                    "type": "string"
                }
            ], 
            "option": "virtfs"
        }, 
        {
            "parameters": [
                {
                    "name": "sock_fd", 
                    "type": "number"
                }, 
                {
                    "name": "socket", 
                    "type": "string"
                }, 
                {
                    "name": "readonly", 
                    "type": "boolean"
                }, 
                {
                    "name": "writeout", 
                    "type": "string"
                }, 
                {
                    "name": "security_model", 
                    "type": "string"
                }, 
                {
                    "name": "path", 
                    "type": "string"
                }, 
                {
                    "name": "fsdriver", 
                    "type": "string"
                }
            ], 
            "option": "fsdev"
        }, 
        {
            "parameters": [
            ], 
            "option": "hdachs", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "snapshot", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "pflash", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "sd", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "mtdblock", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "copy-on-read", 
                    "help": "copy read data from backing file into image file", 
                    "type": "boolean"
                }, 
                {
                    "name": "werror", 
                    "help": "write error action", 
                    "type": "string"
                }, 
                {
                    "name": "rerror", 
                    "help": "read error action", 
                    "type": "string"
                }, 
                {
                    "name": "read-only", 
                    "help": "open drive file as read-only", 
                    "type": "boolean"
                }, 
                {
                    "name": "file", 
                    "help": "file name", 
                    "type": "string"
                }, 
                {
                    "name": "addr", 
                    "help": "pci address (virtio only)", 
                    "type": "string"
                }, 
                {
                    "name": "boot", 
                    "help": "(deprecated, ignored)", 
                    "type": "boolean"
                }, 
                {
                    "name": "trans", 
                    "help": "chs translation (auto, lba, none)", 
                    "type": "string"
                }, 
                {
                    "name": "secs", 
                    "help": "number of sectors (ide disk geometry)", 
                    "type": "number"
                }, 
                {
                    "name": "heads", 
                    "help": "number of heads (ide disk geometry)", 
                    "type": "number"
                }, 
                {
                    "name": "cyls", 
                    "help": "number of cylinders (ide disk geometry)", 
                    "type": "number"
                }, 
                {
                    "name": "if", 
                    "help": "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 
                    "type": "string"
                }, 
                {
                    "name": "media", 
                    "help": "media type (disk, cdrom)", 
                    "type": "string"
                }, 
                {
                    "name": "index", 
                    "help": "index number", 
                    "type": "number"
                }, 
                {
                    "name": "unit", 
                    "help": "unit number (i.e. lun for scsi)", 
                    "type": "number"
                }, 
                {
                    "name": "bus", 
                    "help": "bus number", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.iops-size", 
                    "help": "when limiting by iops max size of an I/O in bytes", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.bps-write-max", 
                    "help": "total bytes write burst", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.bps-read-max", 
                    "help": "total bytes read burst", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.bps-total-max", 
                    "help": "total bytes burst", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.iops-write-max", 
                    "help": "I/O operations write burst", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.iops-read-max", 
                    "help": "I/O operations read burst", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.iops-total-max", 
                    "help": "I/O operations burst", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.bps-write", 
                    "help": "limit write bytes per second", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.bps-read", 
                    "help": "limit read bytes per second", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.bps-total", 
                    "help": "limit total bytes per second", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.iops-write", 
                    "help": "limit write operations per second", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.iops-read", 
                    "help": "limit read operations per second", 
                    "type": "number"
                }, 
                {
                    "name": "throttling.iops-total", 
                    "help": "limit total I/O operations per second", 
                    "type": "number"
                }, 
                {
                    "name": "werror", 
                    "help": "write error action", 
                    "type": "string"
                }, 
                {
                    "name": "serial", 
                    "help": "disk serial number", 
                    "type": "string"
                }, 
                {
                    "name": "format", 
                    "help": "disk format (raw, qcow2, ...)", 
                    "type": "string"
                }, 
                {
                    "name": "aio", 
                    "help": "host AIO implementation (threads, native)", 
                    "type": "string"
                }, 
                {
                    "name": "cache.no-flush", 
                    "help": "ignore any flush requests for the device", 
                    "type": "boolean"
                }, 
                {
                    "name": "cache.direct", 
                    "help": "enables use of O_DIRECT (bypass the host page cache)", 
                    "type": "boolean"
                }, 
                {
                    "name": "cache.writeback", 
                    "help": "enables writeback mode for any caches", 
                    "type": "boolean"
                }, 
                {
                    "name": "discard", 
                    "help": "discard operation (ignore/off, unmap/on)", 
                    "type": "string"
                }, 
                {
                    "name": "snapshot", 
                    "help": "enable/disable snapshot mode", 
                    "type": "boolean"
                }
            ], 
            "option": "drive"
        }, 
        {
            "parameters": [
            ], 
            "option": "cdrom", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "hdd", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "hdc", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "hdb", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "hda", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "fdb", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "fda", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "uuid", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "debug-threads", 
                    "help": "When enabled, name the individual threads; defaults off.\nNOTE: The thread names are for debugging and not a\nstable API.", 
                    "type": "boolean"
                }, 
                {
                    "name": "process", 
                    "help": "Sets the name of the QEMU process, as shown in top etc", 
                    "type": "string"
                }, 
                {
                    "name": "guest", 
                    "help": "Sets the name of the guest.\nThis name will be displayed in the SDL window caption.\nThe name will also be used for the VNC server", 
                    "type": "string"
                }
            ], 
            "option": "name"
        }, 
        {
            "parameters": [
            ], 
            "option": "device", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "balloon", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "soundhw", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "audio-help", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "k", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "mem-prealloc", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "mem-path", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "m", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "strict", 
                    "type": "boolean"
                }, 
                {
                    "name": "reboot-timeout", 
                    "type": "string"
                }, 
                {
                    "name": "splash-time", 
                    "type": "string"
                }, 
                {
                    "name": "splash", 
                    "type": "string"
                }, 
                {
                    "name": "menu", 
                    "type": "boolean"
                }, 
                {
                    "name": "once", 
                    "type": "string"
                }, 
                {
                    "name": "order", 
                    "type": "string"
                }
            ], 
            "option": "boot"
        }, 
        {
            "parameters": [
                {
                    "name": "value", 
                    "type": "string"
                }, 
                {
                    "name": "property", 
                    "type": "string"
                }, 
                {
                    "name": "driver", 
                    "type": "string"
                }
            ], 
            "option": "global"
        }, 
        {
            "parameters": [
            ], 
            "option": "set", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "opaque", 
                    "help": "free-form string used to describe fd", 
                    "type": "string"
                }, 
                {
                    "name": "set", 
                    "help": "ID of the fd set to add fd to", 
                    "type": "number"
                }, 
                {
                    "name": "fd", 
                    "help": "file descriptor of which a duplicate is added to fd set", 
                    "type": "number"
                }
            ], 
            "option": "add-fd"
        }, 
        {
            "parameters": [
            ], 
            "option": "numa", 
            "argument-state": "unspecified-parameters-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "maxcpus", 
                    "type": "number"
                }, 
                {
                    "name": "threads", 
                    "type": "number"
                }, 
                {
                    "name": "cores", 
                    "type": "number"
                }, 
                {
                    "name": "sockets", 
                    "type": "number"
                }, 
                {
                    "name": "cpus", 
                    "type": "number"
                }
            ], 
            "option": "smp"
        }, 
        {
            "parameters": [
            ], 
            "option": "cpu", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "M", 
            "argument-state": "no-parameter-argument"
        }, 
        {
            "parameters": [
                {
                    "name": "kvm-type", 
                    "help": "Specifies the KVM virtualization mode (HV, PR)", 
                    "type": "string"
                }, 
                {
                    "name": "firmware", 
                    "help": "firmware image", 
                    "type": "string"
                }, 
                {
                    "name": "usb", 
                    "help": "Set on/off to enable/disable usb", 
                    "type": "boolean"
                }, 
                {
                    "name": "mem-merge", 
                    "help": "enable/disable memory merge support", 
                    "type": "boolean"
                }, 
                {
                    "name": "dump-guest-core", 
                    "help": "Include guest memory in  a core dump", 
                    "type": "boolean"
                }, 
                {
                    "name": "dt_compatible", 
                    "help": "Overrides the \"compatible\" property of the dt root node", 
                    "type": "string"
                }, 
                {
                    "name": "phandle_start", 
                    "help": "The first phandle ID we may generate dynamically", 
                    "type": "number"
                }, 
                {
                    "name": "dumpdtb", 
                    "help": "Dump current dtb to a file and quit", 
                    "type": "string"
                }, 
                {
                    "name": "dtb", 
                    "help": "Linux kernel device tree file", 
                    "type": "string"
                }, 
                {
                    "name": "append", 
                    "help": "Linux kernel command line", 
                    "type": "string"
                }, 
                {
                    "name": "initrd", 
                    "help": "Linux initial ramdisk file", 
                    "type": "string"
                }, 
                {
                    "name": "kernel", 
                    "help": "Linux kernel image file", 
                    "type": "string"
                }, 
                {
                    "name": "kvm_shadow_mem", 
                    "help": "KVM shadow MMU size", 
                    "type": "size"
                }, 
                {
                    "name": "kernel_irqchip", 
                    "help": "use KVM in-kernel irqchip", 
                    "type": "boolean"
                }, 
                {
                    "name": "accel", 
                    "help": "accelerator list", 
                    "type": "string"
                }, 
                {
                    "name": "type", 
                    "help": "emulated machine", 
                    "type": "string"
                }
            ], 
            "option": "machine"
        }, 
        {
            "parameters": [
            ], 
            "option": "version", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "help", 
            "argument-state": "no-argument"
        }, 
        {
            "parameters": [
            ], 
            "option": "h", 
            "argument-state": "no-argument"
        }
    ]
}

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