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device-core: use atomic_set on .realized property 

Some code might race with placement of new devices on a bus.
We currently first place a (unrealized) device on the bus
and then realize it.

As a workaround, users that scan the child device list, can
check the realized property to see if it is safe to access such a device.
Use an atomic write here too to aid with this.

A separate discussion is what to do with devices that are unrealized:
It looks like for this case we only call the hotplug handler's unplug
callback and its up to it to unrealize the device.
An atomic operation doesn't cause harm for this code path though.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20200913160259.32145-6-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20201006123904.610658-10-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky 2020-10-06 15:39:00 +03:00 committed by Paolo Bonzini
parent 42a90a899e
commit a23151e8cc
2 changed files with 20 additions and 1 deletions
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19
hw/core/qdev.c
View File

@ -946,7 +946,25 @@ static void device_set_realized(Object *obj, bool value, Error **errp)
}
}
qatomic_store_release(&dev->realized, value);
} else if (!value && dev->realized) {
/*
* Change the value so that any concurrent users are aware
* that the device is going to be unrealized
*
* TODO: change .realized property to enum that states
* each phase of the device realization/unrealization
*/
qatomic_set(&dev->realized, value);
/*
* Ensure that concurrent users see this update prior to
* any other changes done by unrealize.
*/
smp_wmb();
QLIST_FOREACH(bus, &dev->child_bus, sibling) {
qbus_unrealize(bus);
}
@ -961,7 +979,6 @@ static void device_set_realized(Object *obj, bool value, Error **errp)
}
assert(local_err == NULL);
dev->realized = value;
return;
child_realize_fail:

2
include/hw/qdev-core.h
View File

@ -163,6 +163,8 @@ struct NamedClockList {
/**
* DeviceState:
* @realized: Indicates whether the device has been fully constructed.
* When accessed outsize big qemu lock, must be accessed with
* atomic_load_acquire()
* @reset: ResettableState for the device; handled by Resettable interface.
*
* This structure should not be accessed directly. We declare it here