If a node name instead of a BlockBackend name is specified as the driver
for a guest device, an anonymous BlockBackend is created now.
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
hw/core/qdev-properties-system.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c
index df38b8a..69b451e 100644
--- a/hw/core/qdev-properties-system.c
+++ b/hw/core/qdev-properties-system.c
@@ -72,12 +72,21 @@ static void parse_drive(DeviceState *dev, const char *str,
void **ptr,
const char *propname, Error **errp)
{
BlockBackend *blk;
+ bool blk_created = false;
blk = blk_by_name(str);
if (!blk) {
+ BlockDriverState *bs = bdrv_lookup_bs(NULL, str, NULL);
+ if (bs) {
+ blk = blk_new();
+ blk_insert_bs(blk, bs);
+ blk_created = true;
+ }
+ }
+ if (!blk) {
error_setg(errp, "Property '%s.%s' can't find value '%s'",
object_get_typename(OBJECT(dev)), propname, str);
- return;
+ goto fail;
}
if (blk_attach_dev(blk, dev) < 0) {
DriveInfo *dinfo = blk_legacy_dinfo(blk);
@@ -91,9 +100,16 @@ static void parse_drive(DeviceState *dev, const char *str,
void **ptr,
error_setg(errp, "Drive '%s' is already in use by another device",
str);
}
- return;
+ goto fail;
}
+
*ptr = blk;
+
+fail:
+ if (blk_created) {
+ /* If we need to keep a reference, blk_attach_dev() took it */
+ blk_unref(blk);
+ }
}
static void release_drive(Object *obj, const char *name, void *opaque)
@@ -127,7 +143,7 @@ static void set_drive(Object *obj, Visitor *v, const char
*name, void *opaque,
PropertyInfo qdev_prop_drive = {
.name = "str",
- .description = "ID of a drive to use as a backend",
+ .description = "Node name or ID of a block device to use as a backend",
.get = get_drive,
.set = set_drive,
.release = release_drive,
--
1.8.3.1
