Re: [Qemu-devel] [PATCH v5 02/10] accel: introduce AccelClass.global_props

[Peter Xu <peterx@redhat.com>]

On Fri, Jun 23, 2017 at 06:31:27PM -0300, Eduardo Habkost wrote:
> On Fri, Jun 23, 2017 at 12:46:38PM +0800, Peter Xu wrote:
> > Introduce this new field for the accelerator classes so that each
> > specific accelerator in the future can register its own global
> > properties to be used further by the system. It works just like how the
> > old machine compatible properties do, but only tailored for
> > accelerators.
> > 
> > Introduce register_compat_props_array() for it. Export it so that it may
> > be used in other codes as well in the future.
> > 
> > Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
> > Signed-off-by: Peter Xu <peterx@redhat.com>
> > ---
> >  accel/accel.c                |  6 ++++++
> >  hw/core/qdev-properties.c    |  7 +++++++
> >  include/hw/qdev-properties.h |  1 +
> >  include/sysemu/accel.h       | 10 ++++++++++
> >  vl.c                         |  1 +
> >  5 files changed, 25 insertions(+)
> > 
> > diff --git a/accel/accel.c b/accel/accel.c
> > index 7c079a5..fa85844 100644
> > --- a/accel/accel.c
> > +++ b/accel/accel.c
> > @@ -120,6 +120,12 @@ void configure_accelerator(MachineState *ms)
> >      }
> >  }
> >  
> > +void accel_register_compat_props(AccelState *accel)
> > +{
> > +    AccelClass *class = ACCEL_GET_CLASS(accel);
> > +    register_compat_props_array(class->global_props);
> > +}
> > +
> >  static void register_accel_types(void)
> >  {
> >      type_register_static(&accel_type);
> > diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
> > index 6ff1ac3..19fa335 100644
> > --- a/hw/core/qdev-properties.c
> > +++ b/hw/core/qdev-properties.c
> > @@ -1060,6 +1060,13 @@ void register_compat_prop(const char *driver,
> >      qdev_prop_register_global(p);
> >  }
> >  
> > +void register_compat_props_array(GlobalProperty *prop)
> 
> Note for a later: we need to stop reusing struct GlobalProperty here,
> because the 'user_provided', 'used', and 'errp' fields are ignored by
> register_compat_prop(), but people may believe the are not.
> 
> I suggest defining:
> 
>   struct GlobalPropertyValue {
>       const char *driver, *property, *value;
>   };
> 
> and use it instead of GlobalProperty for MachineClass::compat_props,
> AccelClass::global_props, and register_compat_prop().

Yeah maybe another definition would be nicer.

Do you mind I skip this change in this series? After all it can be
done on top, and can be separated from current work.

> 
> > +{
> > +    for (; prop && prop->driver; prop++) {
> > +        register_compat_prop(prop->driver, prop->property, prop->value);
> > +    }
> > +}
> > +
> >  void qdev_prop_register_global_list(GlobalProperty *props)
> >  {
> >      int i;
> > diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h
> > index 1722ca4..2bac6a0 100644
> > --- a/include/hw/qdev-properties.h
> > +++ b/include/hw/qdev-properties.h
> > @@ -203,6 +203,7 @@ void error_set_from_qdev_prop_error(Error **errp, int ret, DeviceState *dev,
> >  
> >  void register_compat_prop(const char *driver, const char *property,
> >                            const char *value);
> 
> I suggest documenting here that this function will call
> register_compat_prop(), so it will register internal (not user-provided)
> global properties.

Will do.

> 
> > +void register_compat_props_array(GlobalProperty *prop);
> >  
> >  /**
> >   * qdev_property_add_static:
> > diff --git a/include/sysemu/accel.h b/include/sysemu/accel.h
> > index 15944c1..effcd7f 100644
> > --- a/include/sysemu/accel.h
> > +++ b/include/sysemu/accel.h
> > @@ -24,6 +24,7 @@
> >  #define HW_ACCEL_H
> >  
> >  #include "qom/object.h"
> > +#include "hw/qdev-properties.h"
> >  
> >  typedef struct AccelState {
> >      /*< private >*/
> > @@ -40,6 +41,13 @@ typedef struct AccelClass {
> >      int (*available)(void);
> >      int (*init_machine)(MachineState *ms);
> >      bool *allowed;
> > +    /*
> > +     * Array of global properties that would be applied when specific
> > +     * accelerator is chosen. It works just like
> > +     * MachineClass.compat_props but it's for accelerators not
> > +     * machines.
> 
> I suggest adding this:
> 
> "Accelerator-provided global properties may be overridden by
> machine-type compat_props or user-provided global properties."

Will do.

Thanks,

-- 
Peter Xu