Re: [Qemu-devel] [PATCH] Show values and description when using "qom-list"

[Dr. David Alan Gilbert]

* QingFeng Hao (address@hidden) wrote:
> 
> 
> 在 2018/4/13 16:05, Perez Blanco, Ricardo (Nokia - BE/Antwerp) 写道:
> > Dear all,
> > 
> > Here you can find my first contribution to qemu. Please, do not hesitate to 
> > do any kind of remark.
> > 
> > Based on ac4ba87ae0738d7a77708f8ce31ae2378ab99654
> > 
> > Kind regards,
> > 
> > Ricardo Perez Blanco
> > 
> >>From 65df20cef2846d764a8a821574f5f3643391aac5 Mon Sep 17 00:00:00 2001
> > From: Ricardo Perez Blanco <address@hidden>
> > Date: Wed, 11 Apr 2018 12:09:11 +0200
> > Subject: [PATCH] Show values and description when using "qom-list"
> > 
> > For debugging purposes it is very useful to:
> >  - See the description of the field. This information is already filled
> >    in but not shown in "qom-list" command.
> >  - Display value of the field. So far, only well known types are
> >    implemented (string, str, int, uint, bool).
> Need we support other types like QList and QDict? I think yes and suggest a 
> new command
> to be introduced like qom-list-property or qom-get. The resorts may be:
>       1) print the json string just as Alan's former patch
>         2) print the value step by step. Supposing property foo is a 
> structure,
>            qom-list-property path foo prints its members as "mem1;mem2;mem3"
>            and qom-list-property path foo.mem1 prints mem1's value.
> And some properties don't have get/set callback set, which prompts as below 
> if doing
> qom-get/set:
> (qemu) qom-get /machine kernel-irqchip
> Insufficient permission to perform this operation
> For these properties I think we may need to not show the value in qom-list.

So while I think it would be good to handle all the cases, I'd be happy
to take just the current enhancements to qom-list (once the cleanups that Eric
suggested are fixed).  Being able to see even just the int/bool/strings
is very useful and something I've wanted for a while.

Dave

> Thanks!
> 
> > 
> > Signed-off-by: Ricardo Perez Blanco <address@hidden>
> > ---
> >  hmp.c          | 13 +++++++++++--
> >  qapi/misc.json |  4 +++-
> >  qmp.c          | 26 ++++++++++++++++++++++++++
> >  3 files changed, 40 insertions(+), 3 deletions(-)
> > 
> > diff --git a/hmp.c b/hmp.c
> > index a25c7bd..967e0b2 100644
> > --- a/hmp.c
> > +++ b/hmp.c
> > @@ -2490,8 +2490,17 @@ void hmp_qom_list(Monitor *mon, const QDict *qdict)
> >          while (list != NULL) {
> >              ObjectPropertyInfo *value = list->value;
> > 
> > -            monitor_printf(mon, "%s (%s)\n",
> > -                           value->name, value->type);
> > +            monitor_printf(mon, "%s", value->name);
> > +            if (value->value) {
> > +                monitor_printf(mon, "=%s", value->value);
> > +            }
> > +            monitor_printf(mon, " (%s)", value->type);
> > +            if (value->description) {
> > +                monitor_printf(mon, "\r\t\t\t\t\t\t\t\t\t[Description: 
> > %s]",
> > +                               value->description);
> > +            }
> > +            monitor_printf(mon, "\n");
> > +
> >              list = list->next;
> >          }
> >          qapi_free_ObjectPropertyInfoList(start);
> > diff --git a/qapi/misc.json b/qapi/misc.json
> > index 5636f4a..6b3b4de 100644
> > --- a/qapi/misc.json
> > +++ b/qapi/misc.json
> > @@ -1328,10 +1328,12 @@
> >  #
> >  # @description: if specified, the description of the property.
> >  #
> > +# @value: if specified, the value of the property.
> > +#
> >  # Since: 1.2
> >  ##
> >  { 'struct': 'ObjectPropertyInfo',
> > -  'data': { 'name': 'str', 'type': 'str', '*description': 'str' } }
> > +  'data': { 'name': 'str', 'type': 'str', '*description':'str', 
> > '*value':'str' } }
> > 
> >  ##
> >  # @qom-list:
> > diff --git a/qmp.c b/qmp.c
> > index f722616..750b5d0 100644
> > --- a/qmp.c
> > +++ b/qmp.c
> > @@ -237,6 +237,32 @@ ObjectPropertyInfoList *qmp_qom_list(const char *path, 
> > Error **errp)
> > 
> >          entry->value->name = g_strdup(prop->name);
> >          entry->value->type = g_strdup(prop->type);
> > +        if (prop->description) {
> > +            entry->value->description = g_strdup(prop->description);
> > +        }
> > +        if ((g_ascii_strncasecmp(entry->value->type, "string", 6) == 0) ||
> > +            (g_ascii_strncasecmp(entry->value->type, "str", 3) == 0)) {
> > +            Error **errp = NULL;
> > +            entry->value->value = g_strdup_printf("\"%s\"",
> > +                object_property_get_str(obj, entry->value->name, errp));
> > +        }
> > +        if (g_ascii_strncasecmp(entry->value->type, "int", 3) == 0) {
> > +            Error **errp = NULL;
> > +            entry->value->value = g_strdup_printf("%ld",
> > +                object_property_get_int(obj, entry->value->name, errp));
> > +        }
> > +        if (g_ascii_strncasecmp(entry->value->type, "uint", 4) == 0) {
> > +            Error **errp = NULL;
> > +            entry->value->value = g_strdup_printf("%lu",
> > +                object_property_get_uint(obj, entry->value->name, errp));
> > +        }
> > +        if (g_ascii_strncasecmp(entry->value->type, "bool", 4) == 0) {
> > +            Error **errp = NULL;
> > +            entry->value->value = g_strdup_printf("%s",
> > +               (object_property_get_bool(obj, entry->value->name, errp) == 
> > true)
> > +                ? "true" : "false");
> > +        }
> > +
> >      }
> > 
> >      return props;
> > --
> > 1.8.3.1
> > 
> > 
> 
> -- 
> Regards
> QingFeng Hao
> 
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK