From e7e0d52dc6cbce267757697f9730d5d8d2a916c1 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Thu, 25 Mar 2021 15:33:10 +0000 Subject: [PATCH] hw/ppc/e500plat: Only try to add valid dynamic sysbus devices to platform bus The e500plat machine device plug callback currently calls platform_bus_link_device() for any sysbus device. This is overly broad, because platform_bus_link_device() will unconditionally grab the IRQs and MMIOs of the device it is passed, whether it was intended for the platform bus or not. Restrict hotpluggability of sysbus devices to only those devices on the dynamic sysbus allowlist. We were mostly getting away with this because the board creates the platform bus as the last device it creates, and so the hotplug callback did not do anything for all the sysbus devices created by the board itself. However if the user plugged in a device which itself uses a sysbus device internally we would have mishandled this and probably asserted. An example of this is: qemu-system-ppc64 -M ppce500 -device macio-oldworld This isn't a sensible command because the macio-oldworld device is really specific to the 'g3beige' machine, but we now fail with a reasonable error message rather than asserting: qemu-system-ppc64: Device heathrow is not supported by this machine yet. Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Reviewed-by: Mark Cave-Ayland Reviewed-by: Eric Auger Acked-by: David Gibson Message-id: 20210325153310.9131-5-peter.maydell@linaro.org --- hw/ppc/e500plat.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/hw/ppc/e500plat.c b/hw/ppc/e500plat.c index bddd5e7c48..fc911bbb7b 100644 --- a/hw/ppc/e500plat.c +++ b/hw/ppc/e500plat.c @@ -48,7 +48,9 @@ static void e500plat_machine_device_plug_cb(HotplugHandler *hotplug_dev, PPCE500MachineState *pms = PPCE500_MACHINE(hotplug_dev); if (pms->pbus_dev) { - if (object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE)) { + MachineClass *mc = MACHINE_GET_CLASS(pms); + + if (device_is_dynamic_sysbus(mc, dev)) { platform_bus_link_device(pms->pbus_dev, SYS_BUS_DEVICE(dev)); } } @@ -58,7 +60,9 @@ static HotplugHandler *e500plat_machine_get_hotpug_handler(MachineState *machine, DeviceState *dev) { - if (object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE)) { + MachineClass *mc = MACHINE_GET_CLASS(machine); + + if (device_is_dynamic_sysbus(mc, dev)) { return HOTPLUG_HANDLER(machine); }