scsi: Reject unimplemented error actions

drive_init() doesn't permit rerror for if=scsi, but that's worthless:
we get it via if=none and -device.

Moreover, scsi-generic doesn't support werror.  Since drive_init()
doesn't catch that, option werror was silently ignored even with
if=scsi.

Wart: unlike drive_init(), we don't reject the default action when
it's explicitly specified.  That's because we can't distinguish "no
rerror option" from "rerror=report", or "no werror" from
"rerror=enospc".  Left for another day.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 3e41011..c30709c 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -1059,6 +1059,11 @@ static int scsi_disk_initfn(SCSIDevice *dev)
     s->bs = s->qdev.conf.bs;
     is_cd = bdrv_get_type_hint(s->bs) == BDRV_TYPE_CDROM;
 
+    if (bdrv_get_on_error(s->bs, 1) != BLOCK_ERR_REPORT) {
+        error_report("Device doesn't support drive option rerror");
+        return -1;
+    }
+
     if (!s->serial) {
         /* try to fall back to value set with legacy -drive serial=... */
         dinfo = drive_get_by_blockdev(s->bs);