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spapr: Do TPM proxy hotplug sanity checks at pre-plug 

There can be only one TPM proxy at a time. This is currently
checked at plug time. But this can be detected at pre-plug in
order to error out earlier.

This allows to get rid of error handling in the plug handler.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20201120234208.683521-9-groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2020-11-21 00:42:07 +01:00 committed by David Gibson
parent 9a07069958
commit ac96807b02
1 changed files with 20 additions and 7 deletions
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27
hw/ppc/spapr.c
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@ -3971,16 +3971,27 @@ static void spapr_phb_unplug_request(HotplugHandler *hotplug_dev,
}
}
static void spapr_tpm_proxy_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
static
bool spapr_tpm_proxy_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
SpaprMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev));
if (spapr->tpm_proxy != NULL) {
error_setg(errp, "Only one TPM proxy can be specified for this machine");
return false;
}
return true;
}
static void spapr_tpm_proxy_plug(HotplugHandler *hotplug_dev, DeviceState *dev)
{
SpaprMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev));
SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(dev);
if (spapr->tpm_proxy != NULL) {
error_setg(errp, "Only one TPM proxy can be specified for this machine");
return;
}
/* Already checked in spapr_tpm_proxy_pre_plug() */
g_assert(spapr->tpm_proxy == NULL);
spapr->tpm_proxy = tpm_proxy;
}
@ -4004,7 +4015,7 @@ static void spapr_machine_device_plug(HotplugHandler *hotplug_dev,
} else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_PCI_HOST_BRIDGE)) {
spapr_phb_plug(hotplug_dev, dev);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_TPM_PROXY)) {
spapr_tpm_proxy_plug(hotplug_dev, dev, errp);
spapr_tpm_proxy_plug(hotplug_dev, dev);
}
}
@ -4067,6 +4078,8 @@ static void spapr_machine_device_pre_plug(HotplugHandler *hotplug_dev,
spapr_core_pre_plug(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_PCI_HOST_BRIDGE)) {
spapr_phb_pre_plug(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_TPM_PROXY)) {
spapr_tpm_proxy_pre_plug(hotplug_dev, dev, errp);
}
}