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[libvirt] [PATCH v2] qemu: Split scsi-disk into into scsi-hd and scsi-cd



A "scsi-disk" device can be either a hard disk or a CD-ROM,
if there is ",media=cdrom" specified for the backend, it's
a CD-ROM, otherwise it's a hard disk.

But upstream qemu splitted "scsi-disk" into "scsi-hd" and
"scsi-cd" since commit b443ae, and ",media=cdrom" is not
required for scsi-cd anymore. "scsi-disk" is still supported
for backwards compatibility, but no doubt we should go
foward.

---
No changes since v1
---
 src/qemu/qemu_capabilities.c |    3 +++
 src/qemu/qemu_capabilities.h |    1 +
 src/qemu/qemu_command.c      |   39 +++++++++++++++++++++++++++++++--------
 tests/qemuhelptest.c         |    6 ++++--
 tests/qemuxml2argvtest.c     |    3 +++
 5 files changed, 42 insertions(+), 10 deletions(-)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index fd4ca4d..4e22f3e8 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -159,6 +159,7 @@ VIR_ENUM_IMPL(qemuCaps, QEMU_CAPS_LAST,
 
               "block-job-sync", /* 90 */
               "block-job-async",
+              "scsi-cd",
     );
 
 struct qemu_feature_flags {
@@ -1451,6 +1452,8 @@ qemuCapsParseDeviceStr(const char *str, virBitmapPtr flags)
         qemuCapsSet(flags, QEMU_CAPS_SCSI_DISK_CHANNEL);
     if (strstr(str, "scsi-block"))
         qemuCapsSet(flags, QEMU_CAPS_SCSI_BLOCK);
+    if (strstr(str, "scsi-cd"))
+        qemuCapsSet(flags, QEMU_CAPS_SCSI_CD);
 
     return 0;
 }
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 6550d59..2aba502 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -126,6 +126,7 @@ enum qemuCapsFlags {
     QEMU_CAPS_TRANSACTION        = 89, /* transaction monitor command */
     QEMU_CAPS_BLOCKJOB_SYNC      = 90, /* RHEL 6.2 block_job_cancel */
     QEMU_CAPS_BLOCKJOB_ASYNC     = 91, /* qemu 1.1 block-job-cancel */
+    QEMU_CAPS_SCSI_CD            = 92, /* -device scsi-cd */
 
     QEMU_CAPS_LAST,                   /* this must always be the last item */
 };
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index c82f5bc..ff82b26 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1978,8 +1978,14 @@ qemuBuildDriveStr(virConnectPtr conn ATTRIBUTE_UNUSED,
     else
         virBufferAsprintf(&opt, "if=%s", bus);
 
-    if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
-        virBufferAddLit(&opt, ",media=cdrom");
+    if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM) {
+        if ((disk->bus == VIR_DOMAIN_DISK_BUS_SCSI)) {
+            if (!qemuCapsGet(qemuCaps, QEMU_CAPS_SCSI_CD))
+                virBufferAddLit(&opt, ",media=cdrom");
+        } else {
+            virBufferAddLit(&opt, ",media=cdrom");
+        }
+    }
 
     if (qemuCapsGet(qemuCaps, QEMU_CAPS_DEVICE)) {
         virBufferAsprintf(&opt, ",id=%s%s", QEMU_DRIVE_HOST_PREFIX, disk->info.alias);
@@ -2229,10 +2235,19 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
                 goto error;
             }
 
-            if (disk->device == VIR_DOMAIN_DISK_DEVICE_LUN)
+            if (disk->device == VIR_DOMAIN_DISK_DEVICE_LUN) {
                 virBufferAddLit(&opt, "scsi-block");
-            else
-                virBufferAddLit(&opt, "scsi-disk");
+            } else {
+                if (qemuCapsGet(qemuCaps, QEMU_CAPS_SCSI_CD)) {
+                    if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
+                        virBufferAddLit(&opt, "scsi-cd");
+                    else
+                        virBufferAddLit(&opt, "scsi-hd");
+                } else {
+                    virBufferAddLit(&opt, "scsi-disk");
+                }
+            }
+
             virBufferAsprintf(&opt, ",bus=scsi%d.%d,scsi-id=%d",
                               disk->info.addr.drive.controller,
                               disk->info.addr.drive.bus,
@@ -2255,10 +2270,18 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
                 }
             }
 
-            if (disk->device != VIR_DOMAIN_DISK_DEVICE_LUN)
-                virBufferAddLit(&opt, "scsi-disk");
-            else
+            if (disk->device != VIR_DOMAIN_DISK_DEVICE_LUN) {
+                if (qemuCapsGet(qemuCaps, QEMU_CAPS_SCSI_CD)) {
+                    if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
+                        virBufferAddLit(&opt, "scsi-cd");
+                    else
+                        virBufferAddLit(&opt, "scsi-hd");
+                } else {
+                    virBufferAddLit(&opt, "scsi-disk");
+                }
+            } else {
                 virBufferAddLit(&opt, "scsi-block");
+            }
 
             virBufferAsprintf(&opt, ",bus=scsi%d.0,channel=%d,scsi-id=%d,lun=%d",
                               disk->info.addr.drive.controller,
diff --git a/tests/qemuhelptest.c b/tests/qemuhelptest.c
index 05fdc4d..a01c389 100644
--- a/tests/qemuhelptest.c
+++ b/tests/qemuhelptest.c
@@ -605,7 +605,8 @@ mymain(void)
             QEMU_CAPS_VIRTIO_BLK_SCSI,
             QEMU_CAPS_VIRTIO_BLK_SG_IO,
             QEMU_CAPS_DRIVE_COPY_ON_READ,
-            QEMU_CAPS_CPU_HOST);
+            QEMU_CAPS_CPU_HOST,
+            QEMU_CAPS_SCSI_CD);
     DO_TEST("qemu-1.0", 1000000, 0, 0,
             QEMU_CAPS_VNC_COLON,
             QEMU_CAPS_NO_REBOOT,
@@ -674,7 +675,8 @@ mymain(void)
             QEMU_CAPS_VIRTIO_BLK_SG_IO,
             QEMU_CAPS_CPU_HOST,
             QEMU_CAPS_FSDEV_WRITEOUT,
-            QEMU_CAPS_SCSI_BLOCK);
+            QEMU_CAPS_SCSI_BLOCK,
+            QEMU_CAPS_SCSI_CD);
 
     return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
 }
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index fdbe95a..cc1ac44 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -463,6 +463,9 @@ mymain(void)
             QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("disk-scsi-device-auto", false,
             QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
+    DO_TEST("disk-scsi-disk-split", false,
+            QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG,
+            QEMU_CAPS_SCSI_CD);
     DO_TEST("disk-scsi-vscsi", false,
             QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("disk-scsi-virtio-scsi", false,
-- 
1.7.7.3


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