From 5eb6a3c50185e101f87382f41fb66eed5784e7ac Mon Sep 17 00:00:00 2001 From: Greg Kurz Date: Mon, 10 Jul 2017 21:43:01 -0300 Subject: [PATCH] qdev: fix the order compat and global properties are applied The current code recursively applies global properties from child up to parent types. This can cause properties passed with the -global option to be silently overridden by internal compat properties. This is exactly what happened with virtio-*-pci drivers since commit: "9a4c0e220d8a hw/virtio-pci: fix virtio behaviour" Passing -device virtio-blk-pci.disable-modern=off had no effect on 2.6 machine types because the internal virtio-pci.disable-modern=on compat property always prevailed. A workaround for this was included with commit 0bcba41f ("machine: Convert abstract typename on compat_props to subclass names"). This patch fixes the issue properly by reversing the logic: we now go through the global property list and, for each property, we check if it is applicable to the device. This results in compat properties being applied first, in the order they appear in the HW_COMPAT_* macros, followed by global properties, in the order they appear on the command line. Signed-off-by: Greg Kurz Message-Id: <148103887228.22326.478406873609299999.stgit@bahia.lab.toulouse-stg.fr.ibm.com> Signed-off-by: Eduardo Habkost Message-Id: <20170711004303.3902-2-ehabkost@redhat.com> Reviewed-by: Cornelia Huck Reviewed-by: Halil Pasic Signed-off-by: Eduardo Habkost --- hw/core/qdev-properties.c | 15 ++------------- 1 file changed, 2 insertions(+), 13 deletions(-) diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c index dcecdf03e5..58a8f92d92 100644 --- a/hw/core/qdev-properties.c +++ b/hw/core/qdev-properties.c @@ -1149,8 +1149,7 @@ int qdev_prop_check_globals(void) return ret; } -static void qdev_prop_set_globals_for_type(DeviceState *dev, - const char *typename) +void qdev_prop_set_globals(DeviceState *dev) { GList *l; @@ -1158,7 +1157,7 @@ static void qdev_prop_set_globals_for_type(DeviceState *dev, GlobalProperty *prop = l->data; Error *err = NULL; - if (strcmp(typename, prop->driver) != 0) { + if (object_dynamic_cast(OBJECT(dev), prop->driver) == NULL) { continue; } prop->used = true; @@ -1176,16 +1175,6 @@ static void qdev_prop_set_globals_for_type(DeviceState *dev, } } -void qdev_prop_set_globals(DeviceState *dev) -{ - ObjectClass *class = object_get_class(OBJECT(dev)); - - do { - qdev_prop_set_globals_for_type(dev, object_class_get_name(class)); - class = object_class_get_parent(class); - } while (class); -} - /* --- 64bit unsigned int 'size' type --- */ static void get_size(Object *obj, Visitor *v, const char *name, void *opaque,