Re: [Qemu-devel] [BUGFIX][PATCH for 2.2 v5 1/1] -machine vmport=auto: Fix handling of VMWare ioport emulation for xen

[Eduardo Habkost <ehabkost@redhat.com>]

On Fri, Nov 21, 2014 at 09:56:33AM -0500, Don Slutz wrote:
> On 11/21/14 08:53, Eduardo Habkost wrote:
> >On Fri, Nov 21, 2014 at 08:30:58AM -0500, Don Slutz wrote:
> >>On 11/20/14 21:01, Eduardo Habkost wrote:
> >>>On Thu, Nov 20, 2014 at 05:32:56PM -0500, Don Slutz wrote:
> >>>[...]
> [...]
> >>>>+    pcms->vmport = ON_OFF_AUTO_AUTO;
> >>>>+    object_property_add(obj, PC_MACHINE_VMPORT, "str",
> >>>I believe "OnOffAuto" is a valid type name, if it is defined in the QAPI
> >>>schema.
> >>I can only find:
> >>
> >>qapi-types.h:typedef enum OnOffAuto
> >>qapi-types.h:} OnOffAuto;
> >I don't understand what you mean, where did you expect to find it? You added it
> >to the schema, so it is now a valid type name.
> >
> >>Which I use to define pcms->vmport.  The best I can translate this is
> >>that "str" is what you are looking to replace.
> >>
> >>So I plan no change here.
> >You are not defining a string property, but an OnOffAuto enum property,
> >so why use "str"?
> >
> >See, for example, the type of an existing enum property:
> >ide-hd.bios-chs-trans:
> >
> >   $ qemu-system-x86_64 -device ide-hd,?
> >   [...]
> >   ide-hd.bios-chs-trans=BiosAtaTranslation (Logical CHS translation algorithm, auto/none/lba/large/rechs)
> >   [...]
> >   $
> >
> >
> Ok, I now understand what you are getting at.  From object.h:
> 
>  * @type: the type name of the property.  This namespace is pretty loosely
>  *   defined.  Sub namespaces are constructed by using a prefix and then
>  *   to angle brackets.  For instance, the type 'virtio-net-pci' in the
>  *   'link' namespace would be 'link<virtio-net-pci>'.
> 
> It turns out that BiosAtaTranslation is a .name not a .type:
> 

"-device ...,?" above is showing the property type. See
qdev_device_help().

> hyper-0-21-52:~/qemu>git grep BiosAtaTranslation
> hw/core/qdev-properties.c:QEMU_BUILD_BUG_ON(sizeof(BiosAtaTranslation) !=
> sizeof(int));
> hw/core/qdev-properties.c:    .name = "BiosAtaTranslation",
> hw/core/qdev-properties.c:    .enum_table = BiosAtaTranslation_lookup,
> qapi/block.json:# BiosAtaTranslation:
> qapi/block.json:{ 'enum': 'BiosAtaTranslation',

PropertyInfo.name is what is used as the 'type' parameter to
object_property_add() when qdev adds a static property to the object.
See qdev_property_add_static().

> 
> 
> so to me there are a few options:
> 
> 1) "enum"
> 2) "OnOffAuto"
> 3) "enum<OnOffAuto>"
> 4) "enum OnOffAuto"
> 5) "enum-OnOffAuto"
> 
> I think #2 was what you were thinking of, but I am not sure.  Please advise.

The documentation is unclear about the set of valid type names. But as
existing enum properties simply use the enum type name directly, I
suggest "OnOffAuto" to follow existing practice.

-- 
Eduardo