Re: [Qemu-devel] [Qemu-ppc] [PATCH] spapr_pci: fail gracefully with non-pseries machine types

[Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>]

On 10/06/2017 12:09 PM, Greg Kurz wrote:
> QEMU currently crashes when the user tries to add a spapr-pci-host-bridge
> on a non-pseries machine:
>
> $ qemu-system-ppc64 -M ppce500 -device spapr-pci-host-bridge,index=1
> hw/ppc/spapr_pci.c:1535:spapr_phb_realize:
> Object 0x1003dacae60 is not an instance of type spapr-machine
> Aborted (core dumped)
>
> The same thing happens with the deprecated but still available child type
> spapr-pci-vfio-host-bridge.
>
> Fix both by checking the machine type with object_dynamic_cast().
>
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
Reviewed-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>

>   hw/ppc/spapr_pci.c |    8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> index 5049ced4e8b4..9e85106f51f8 100644
> --- a/hw/ppc/spapr_pci.c
> +++ b/hw/ppc/spapr_pci.c
> @@ -1507,7 +1507,7 @@ static void spapr_pci_unplug_request(HotplugHandler *plug_handler,
>
>   static void spapr_phb_realize(DeviceState *dev, Error **errp)
>   {
> -    sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
> +    sPAPRMachineState *spapr;
>       SysBusDevice *s = SYS_BUS_DEVICE(dev);
>       sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(s);
>       PCIHostState *phb = PCI_HOST_BRIDGE(s);
> @@ -1519,6 +1519,12 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
>       const unsigned windows_supported =
>           sphb->ddw_enabled ? SPAPR_PCI_DMA_MAX_WINDOWS : 1;
>
> +    spapr = (sPAPRMachineState *) qdev_get_machine();
> +    if (!object_dynamic_cast((Object *) spapr, TYPE_SPAPR_MACHINE)) {
> +        error_setg(errp, TYPE_SPAPR_PCI_HOST_BRIDGE " needs a pseries machine");
> +        return;
> +    }
> +
>       if (sphb->index != (uint32_t)-1) {
>           sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
>           Error *local_err = NULL;
>
>