Re: [Qemu-devel] [PATCH qom-cpu 1/6] cpu: Introduce CPUClass::parse_features() hook

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 05 Mar 2014 17:06:15 +0100
Andreas Färber <afaerber@suse.de> wrote:

> Am 05.03.2014 16:04, schrieb Igor Mammedov:
> > On Tue,  4 Mar 2014 03:55:44 +0100
> > Andreas Färber <afaerber@suse.de> wrote:
> > 
> >> Adapt the X86CPU implementation to suit the generic hook.
> >> This involves a cleanup of error handling to cope with NULL errp.
> >>
> >> Signed-off-by: Andreas Färber <afaerber@suse.de>
> >> ---
> >>  include/qom/cpu.h |  3 +++
> >>  target-i386/cpu.c | 36 +++++++++++++++++++++---------------
> >>  2 files changed, 24 insertions(+), 15 deletions(-)
> >>
> >> diff --git a/include/qom/cpu.h b/include/qom/cpu.h
> >> index 64ebfa5..43d253a 100644
> >> --- a/include/qom/cpu.h
> >> +++ b/include/qom/cpu.h
> >> @@ -67,6 +67,8 @@ struct TranslationBlock;
> >>   * CPUClass:
> >>   * @class_by_name: Callback to map -cpu command line model name to an
> >>   * instantiatable CPU type.
> >> + * @parse_features: Callback to parse command line arguments.
> >> + * The argument may be modified by the callback.
> > Could you specify which argument is expected to be modified?
> 
> Like so? "The arguments (%str) may be modified by the callback."
> 
> Alternatively I could drop that line, given that it's not const char *.
> Or add a typedef for the callback and document it there using @str syntax.
I'd prefer to drop it.

BTW: why is 'str' modified by callback?

> Thanks,
> Andreas
> 
> > 
> >>   * @reset: Callback to reset the #CPUState to its initial state.
> >>   * @reset_dump_flags: #CPUDumpFlags to use for reset logging.
> >>   * @has_work: Callback for checking if there is work to do.
> >> @@ -96,6 +98,7 @@ typedef struct CPUClass {
> >>      /*< public >*/
> >>  
> >>      ObjectClass *(*class_by_name)(const char *cpu_model);
> >> +    void (*parse_features)(CPUState *cpu, char *str, Error **errp);
> >>  
> >>      void (*reset)(CPUState *cpu);
> >>      int reset_dump_flags;
> [snip]
>