Re: [Qemu-devel] [PATCH v1 2/4] s390x/zpci: use hotplug_dev instead of looking up the host bridge

[Cornelia Huck <cohuck@redhat.com>]

On Mon,  5 Nov 2018 12:03:11 +0100
David Hildenbrand <david@redhat.com> wrote:

> We directly have it in our hands.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
>  hw/s390x/s390-pci-bus.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
> index 1eaae3aca6..68660eac74 100644
> --- a/hw/s390x/s390-pci-bus.c
> +++ b/hw/s390x/s390-pci-bus.c
> @@ -814,9 +814,9 @@ static bool s390_pci_alloc_idx(S390pciState *s, S390PCIBusDevice *pbdev)
>  static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
>                                Error **errp)
>  {
> +    S390pciState *s = S390_PCI_HOST_BRIDGE(hotplug_dev);
>      PCIDevice *pdev = NULL;
>      S390PCIBusDevice *pbdev = NULL;
> -    S390pciState *s = s390_get_phb();
>  
>      if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_BRIDGE)) {
>          BusState *bus;
> @@ -924,11 +924,11 @@ static void s390_pcihost_timer_cb(void *opaque)
>  static void s390_pcihost_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
>                                  Error **errp)
>  {
> +    S390pciState *s = S390_PCI_HOST_BRIDGE(hotplug_dev);
>      PCIDevice *pci_dev = NULL;
>      PCIBus *bus;
>      int32_t devfn;
>      S390PCIBusDevice *pbdev = NULL;
> -    S390pciState *s = s390_get_phb();
>  
>      if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_BRIDGE)) {
>          error_setg(errp, "PCI bridge hot unplug currently not supported");

Not sure whether that is an improvement (s390_get_phb() caches the
value, and is called from multiple other places as well.)