From c79662f7f765a0e6cb7aa26902cc8d61f9022dd5 Mon Sep 17 00:00:00 2001
From: Naphtali Sprei <nsprei@redhat.com>
Date: Thu, 29 Oct 2009 11:42:11 +0200
Subject: [PATCH] Pass the drive's readonly attribute to the guest OS
Implemented for virtio-blk and for scsi
Signed-off-by: Naphtali Sprei <nsprei@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
hw/scsi-disk.c | 3 ++-
hw/virtio-blk.c | 3 +++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 2a9268aa63..5da573d59e 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -633,7 +633,8 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
memset(p, 0, 4);
outbuf[1] = 0; /* Default media type. */
outbuf[3] = 0; /* Block descriptor length. */
- if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM) {
+ if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM ||
+ bdrv_is_read_only(s->dinfo->bdrv)) {
outbuf[2] = 0x80; /* Readonly. */
}
p += 4;
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index 2630b99304..e6df9f2619 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -444,6 +444,9 @@ static uint32_t virtio_blk_get_features(VirtIODevice *vdev)
#endif
if (strcmp(s->serial_str, "0"))
features |= 1 << VIRTIO_BLK_F_IDENTIFY;
+
+ if (bdrv_is_read_only(s->bs))
+ features |= 1 << VIRTIO_BLK_F_RO;
return features;
}