Re: [Qemu-devel] [PATCH] secondary-vga: unregister vram on unplug.

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Gerd Hoffmann (kraxel@redhat.com) wrote:
> On Fri, Jul 20, 2018 at 10:19:48AM +0200, remy.noel@blade-group.com wrote:
> > From: "Remy Noel" <remy.noel@blade-group.com>
> > 
> > When removing a secondary-vga device and then adding it back (or adding
> > an other one), qemu aborts with:
> >     "RAMBlock "0000:00:02.0/vga.vram" already registered, abort!".
> > 
> > It is caused by the vram staying registered, preventing vga replugging.
> 
> David?  Does that look ok?
> 
> This balances the
> 
>      vmstate_register_ram(&s->vram, s->global_vmstate ?  NULL : DEVICE(obj));
> 
> call in vga_common_init().  I'm wondering whenever the manual cleanup is
> actually needed in case owner is not NULL?

I can't see anyone who is calling unregister_ram or the functions it
calls as part of generic device cleanup, so I think it IS needed
to manually do it.

Which is a bit worrying since we have vastly more register's than
unregister's.

Dave

> thanks,
>   Gerd
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK