Re: [Qemu-devel] [PATCH 2/9] pc: acpi: decribe bridge device as not hotpluggable

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 8 Dec 2014 21:13:25 +0200
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> On Mon, Dec 08, 2014 at 04:08:01PM +0000, Igor Mammedov wrote:
> > when bridge hotplug is disabled, i.e. for machine
> > types less then 2.0, bridge device was created as
> > hotpluggable by mistake since commit 133a2da.
> > 
> > Fix it by just creating it as a present device.
> > 
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> 
> What exactly is the problem here?
> It seems that such bridge is hotpluggable, even though
> e.g. windows guests lacks drivers to support this.
before 133a2da slot with existing at startup bridge weren't
marked as hotpluggable nor described in SSDT. But after
133a2da it's described as hotpluggable slot for compat
machines (2.0 and lower) which doesn't match with original
behavior.

Also Marcel mentioned that bridges could be hotpluggable
but that they should not be hot-UNpluggable.

> 
> 
> > ---
> >  hw/i386/acpi-build.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > index b37a397..1fb92e5 100644
> > --- a/hw/i386/acpi-build.c
> > +++ b/hw/i386/acpi-build.c
> > @@ -913,7 +913,7 @@ static void build_pci_bus_end(PCIBus *bus, void *bus_state)
> >              }
> >          }
> >  
> > -        if (!dc->hotpluggable || bridge_in_acpi) {
> > +        if (!dc->hotpluggable || pc->is_bridge) {
> >              clear_bit(slot, slot_hotplug_enable);
> >          }
> >      }
> > -- 
> > 1.8.3.1