[Qemu-devel] [PATCH 3/8] ide scsi virtio-blk: Reject empty drives unless media is removable

[Markus Armbruster <armbru@redhat.com>]

Disks without media make no sense.  For SCSI, a Linux guest kernel
complains during boot.  I didn't try other combinations.

scsi-generic doesn't need the additional check, because it already
requires bdrv_is_sg(), which fails without media.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 hw/ide/core.c   |    4 ++++
 hw/scsi-disk.c  |    5 +++++
 hw/virtio-blk.c |    4 ++++
 3 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/hw/ide/core.c b/hw/ide/core.c
index af52c2c..e20f2e7 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -2630,6 +2630,10 @@ int ide_init_drive(IDEState *s, BlockDriverState *bs,
         s->drive_kind = IDE_CD;
         bdrv_set_change_cb(bs, cdrom_change_cb, s);
     } else {
+        if (!bdrv_is_inserted(s->bs)) {
+            error_report("Device needs media, but drive is empty");
+            return -1;
+        }
         if (bdrv_is_read_only(bs)) {
             error_report("Can't use a read-only drive");
             return -1;
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index c30709c..f43f2d0 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 (!is_cd && !bdrv_is_inserted(s->bs)) {
+        error_report("Device needs media, but drive is empty");
+        return -1;
+    }
+
     if (bdrv_get_on_error(s->bs, 1) != BLOCK_ERR_REPORT) {
         error_report("Device doesn't support drive option rerror");
         return -1;
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index 2de1a5a..89ea20e 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -495,6 +495,10 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf)
         error_report("virtio-blk-pci: drive property not set");
         return NULL;
     }
+    if (!bdrv_is_inserted(conf->bs)) {
+        error_report("Device needs media, but drive is empty");
+        return NULL;
+    }
 
     s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
                                           sizeof(struct virtio_blk_config),
-- 
1.6.6.1