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spapr_pci: fail gracefully with non-pseries machine types 

QEMU currently crashes when the user tries to add an 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().

Reviewed-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2017-10-12 18:30:14 +02:00 committed by David Gibson
parent db50f280cf
commit f7d6bfcdc0
1 changed files with 11 additions and 1 deletions
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12
hw/ppc/spapr_pci.c
View File

@ -1507,7 +1507,12 @@ static void spapr_pci_unplug_request(HotplugHandler *plug_handler,
static void spapr_phb_realize(DeviceState *dev, Error **errp) static void spapr_phb_realize(DeviceState *dev, Error **errp)
{ {
sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); /* We don't use SPAPR_MACHINE() in order to exit gracefully if the user
* tries to add a sPAPR PHB to a non-pseries machine.
*/
sPAPRMachineState *spapr =
(sPAPRMachineState *) object_dynamic_cast(qdev_get_machine(),
TYPE_SPAPR_MACHINE);
SysBusDevice *s = SYS_BUS_DEVICE(dev); SysBusDevice *s = SYS_BUS_DEVICE(dev);
sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(s); sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(s);
PCIHostState *phb = PCI_HOST_BRIDGE(s); PCIHostState *phb = PCI_HOST_BRIDGE(s);
@ -1519,6 +1524,11 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
const unsigned windows_supported = const unsigned windows_supported =
sphb->ddw_enabled ? SPAPR_PCI_DMA_MAX_WINDOWS : 1; sphb->ddw_enabled ? SPAPR_PCI_DMA_MAX_WINDOWS : 1;
if (!spapr) {
error_setg(errp, TYPE_SPAPR_PCI_HOST_BRIDGE " needs a pseries machine");
return;
}
if (sphb->index != (uint32_t)-1) { if (sphb->index != (uint32_t)-1) {
sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr); sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
Error *local_err = NULL; Error *local_err = NULL;