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machine: Convert abstract typename on compat_props to subclass names

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Original problem description by Greg Kurz:

> Since commit "9a4c0e220d8a hw/virtio-pci: fix virtio
> behaviour", passing -device virtio-blk-pci.disable-modern=off
> has no effect on 2.6 machine types because the internal
> virtio-pci.disable-modern=on compat property always prevail.

The same bug also affects other abstract type names mentioned on
compat_props by machine-types: apic-common, i386-cpu, pci-device,
powerpc64-cpu, s390-skeys, spapr-pci-host-bridge, usb-device,
virtio-pci, x86_64-cpu.

The right fix for this problem is to make sure compat_props and
-global options are always applied in the order they are
registered, instead of reordering them based on the type
hierarchy. But changing the ordering rules of -global is risky
and might break existing configurations, so we shouldn't do that
on a stable branch.

This is a temporary hack that will work around the bug when
registering compat_props properties: if we find an abstract class
on compat_props, register properties for all its non-abstract
subtypes instead. This will make sure -global won't be overridden
by compat_props, while keeping the existing ordering rules on
-global options.

Note that there's one case that won't be fixed by this hack:
"-global spapr-pci-vfio-host-bridge.<option>=<value>" won't be
able to override compat_props, because spapr-pci-host-bridge is
not an abstract class.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <1481575745-26120-1-git-send-email-ehabkost@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Tested-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Eduardo Habkost 2016-12-12 18:49:05 -02:00
parent d84f714eaf
commit 0bcba41fe3
1 changed files with 36 additions and 3 deletions
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39
hw/core/machine.c
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@ -585,11 +585,31 @@ static void machine_class_finalize(ObjectClass *klass, void *data)
g_free(mc->name);
}
static void register_compat_prop(const char *driver,
const char *property,
const char *value)
{
GlobalProperty *p = g_new0(GlobalProperty, 1);
/* Machine compat_props must never cause errors: */
p->errp = &error_abort;
p->driver = driver;
p->property = property;
p->value = value;
qdev_prop_register_global(p);
}
static void machine_register_compat_for_subclass(ObjectClass *oc, void *opaque)
{
GlobalProperty *p = opaque;
register_compat_prop(object_class_get_name(oc), p->property, p->value);
}
void machine_register_compat_props(MachineState *machine)
{
MachineClass *mc = MACHINE_GET_CLASS(machine);
int i;
GlobalProperty *p;
ObjectClass *oc;
if (!mc->compat_props) {
return;
@ -597,9 +617,22 @@ void machine_register_compat_props(MachineState *machine)
for (i = 0; i < mc->compat_props->len; i++) {
p = g_array_index(mc->compat_props, GlobalProperty *, i);
/* Machine compat_props must never cause errors: */
p->errp = &error_abort;
qdev_prop_register_global(p);
oc = object_class_by_name(p->driver);
if (oc && object_class_is_abstract(oc)) {
/* temporary hack to make sure we do not override
* globals set explicitly on -global: if an abstract class
* is on compat_props, register globals for all its
* non-abstract subtypes instead.
*
* This doesn't solve the problem for cases where
* a non-abstract typename mentioned on compat_props
* has subclasses, like spapr-pci-host-bridge.
*/
object_class_foreach(machine_register_compat_for_subclass,
p->driver, false, p);
} else {
register_compat_prop(p->driver, p->property, p->value);
}
}
}