[Qemu-devel] [PATCH v2 1/2] xen: Don't change -drive if=xen device name during machine init

[Markus Armbruster <armbru@redhat.com>]

A "top" BlockDriverState has a non-empty device_name.  If the user
doesn't specify one with -drive parameter id, the system supplies a
default name.

xen_config_dev_blk() changes this name, during machine initialization.
Naughty.  Don't do that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 hw/xen_devconfig.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/hw/xen_devconfig.c b/hw/xen_devconfig.c
index 41accbb..7b7b0a2 100644
--- a/hw/xen_devconfig.c
+++ b/hw/xen_devconfig.c
@@ -94,16 +94,15 @@ static int xen_config_dev_all(char *fe, char *be)
 
 int xen_config_dev_blk(DriveInfo *disk)
 {
-    char fe[256], be[256];
+    char fe[256], be[256], device_name[32];
     int vdev = 202 * 256 + 16 * disk->unit;
     int cdrom = disk->media_cd;
     const char *devtype = cdrom ? "cdrom" : "disk";
     const char *mode    = cdrom ? "r"     : "w";
 
-    snprintf(disk->bdrv->device_name, sizeof(disk->bdrv->device_name),
-	     "xvd%c", 'a' + disk->unit);
+    snprintf(device_name, sizeof(device_name), "xvd%c", 'a' + disk->unit);
     xen_be_printf(NULL, 1, "config disk %d [%s]: %s\n",
-                  disk->unit, disk->bdrv->device_name, disk->bdrv->filename);
+                  disk->unit, device_name, disk->bdrv->filename);
     xen_config_dev_dirs("vbd", "qdisk", vdev, fe, be, sizeof(fe));
 
     /* frontend */
@@ -111,7 +110,7 @@ int xen_config_dev_blk(DriveInfo *disk)
     xenstore_write_str(fe, "device-type",     devtype);
 
     /* backend */
-    xenstore_write_str(be, "dev",             disk->bdrv->device_name);
+    xenstore_write_str(be, "dev",             device_name);
     xenstore_write_str(be, "type",            "file");
     xenstore_write_str(be, "params",          disk->bdrv->filename);
     xenstore_write_str(be, "mode",            mode);
-- 
1.7.6.5