[Qemu-devel] [PATCHv2 4/4] scsi: Add 'enclosure' option for scsi devices

[Hannes Reinecke <hare@suse.de>]

Make enclosure support optional with the 'enclosure' argument to
the scsi device.
Adding 'enclosure=on' as option to the SCSI device will present
an enclosure service device on LUN0, either as a stand-alone
LUN (in case LUN0 is not assigned) or by setting the EncServ bit
int the inquiry data if LUN0 is assigned to a block devices.

Signed-off-by: Hannes Reinecke <hare@suse.com>
---
 hw/scsi/scsi-bus.c     | 11 ++++++++---
 hw/scsi/scsi-disk.c    |  4 +++-
 include/hw/scsi/scsi.h |  1 +
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index 79a222f..c11422b 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -22,6 +22,7 @@ static Property scsi_props[] = {
     DEFINE_PROP_UINT32("channel", SCSIDevice, channel, 0),
     DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
     DEFINE_PROP_UINT32("lun", SCSIDevice, lun, -1),
+    DEFINE_PROP_BOOL("enclosure", SCSIDevice, enclosure, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -494,11 +495,14 @@ static bool scsi_target_emulate_inquiry(SCSITargetReq *r)
     if (r->req.lun != 0) {
         r->buf[0] = TYPE_NO_LUN;
     } else {
-        r->buf[0] = TYPE_ENCLOSURE;
+        r->buf[0] = r->req.dev->enclosure ?
+            TYPE_ENCLOSURE : TYPE_NOT_PRESENT | TYPE_INACTIVE;
         r->buf[2] = 5; /* Version */
         r->buf[3] = 2 | 0x10; /* HiSup, response data format */
         r->buf[4] = r->len - 5; /* Additional Length = (Len - 1) - 4 */
-        r->buf[6] = 0x40; /* Enclosure service */
+        if (r->req.dev->enclosure) {
+            r->buf[6] = 0x40; /* Enclosure service */
+        }
         r->buf[7] = 0x10 | (r->req.bus->info->tcq ? 0x02 : 0); /* Sync, TCQ.  */
         memcpy(&r->buf[8], "QEMU    ", 8);
         memcpy(&r->buf[16], "QEMU TARGET     ", 16);
@@ -600,7 +604,8 @@ static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf)
         }
         break;
     case RECEIVE_DIAGNOSTIC:
-        if (!scsi_target_emulate_receive_diagnostic(r)) {
+        if (!r->req.dev->enclosure ||
+            !scsi_target_emulate_receive_diagnostic(r)) {
             goto illegal_request;
         }
         break;
diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index 5f1e5e8..153d97d 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -792,7 +792,9 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
                the additional length is not adjusted */
         outbuf[4] = 36 - 5;
     }
-
+    if (s->qdev.lun == 0 && s->qdev.enclosure) {
+            outbuf[6] = 0x40; /* Enclosure service */
+    }
     /* Sync data transfer and TCQ.  */
     outbuf[7] = 0x10 | (req->bus->info->tcq ? 0x02 : 0);
     return buflen;
diff --git a/include/hw/scsi/scsi.h b/include/hw/scsi/scsi.h
index 6b85786..243c185 100644
--- a/include/hw/scsi/scsi.h
+++ b/include/hw/scsi/scsi.h
@@ -100,6 +100,7 @@ struct SCSIDevice
     BlockConf conf;
     SCSISense unit_attention;
     bool sense_is_ua;
+    bool enclosure;
     uint8_t sense[SCSI_SENSE_BUF_SIZE];
     uint32_t sense_len;
     QTAILQ_HEAD(, SCSIRequest) requests;
-- 
1.8.5.6