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.

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;
 }

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 */
 };

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,

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;
 }

tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-disk-split.args

@@ -0,0 +1,16 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test \
+/usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c \
+-device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x3 \
+-device lsi,id=scsi1,bus=pci.0,addr=0x4 \
+-device lsi,id=scsi2,bus=pci.0,addr=0x5 \
+-device virtio-scsi-pci,id=scsi3,bus=pci.0,addr=0x6 \
+-drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-scsi0-0-1-0 \
+-device scsi-cd,bus=scsi0.0,channel=0,scsi-id=1,lun=0,drive=drive-scsi0-0-1-0,id=scsi0-0-1-0 \
+-drive file=/dev/HostVG/QEMUGuest2,if=none,id=drive-scsi0-0-0-0 \
+-device scsi-cd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0 \
+-drive file=/tmp/scsidisk.img,if=none,id=drive-scsi0-0-0-1 \
+-device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=1,drive=drive-scsi0-0-0-1,id=scsi0-0-0-1 \
+-drive file=/tmp/scsidisk.img,if=none,id=drive-scsi0-0-1-1 \
+-device scsi-hd,bus=scsi0.0,channel=0,scsi-id=1,lun=1,drive=drive-scsi0-0-1-1,id=scsi0-0-1-1 \
+-usb -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7

tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-disk-split.xml

@@ -0,0 +1,44 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='cdrom'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='sda' bus='scsi'/>
+      <address type='drive' controller='0' bus='0' target='1' unit='0'/>
+    </disk>
+    <disk type='block' device='cdrom'>
+      <source dev='/dev/HostVG/QEMUGuest2'/>
+      <target dev='sda' bus='scsi'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <disk type='file' device='disk'>
+      <source file='/tmp/scsidisk.img'/>
+      <target dev='sdc' bus='scsi'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
+    </disk>
+    <disk type='file' device='disk'>
+      <source file='/tmp/scsidisk.img'/>
+      <target dev='sdd' bus='scsi'/>
+      <address type='drive' controller='0' bus='0' target='1' unit='1'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='scsi' index='0' model='virtio-scsi'/>
+    <controller type='scsi' index='1' model='lsilogic'/>
+    <controller type='scsi' index='2' model='lsilogic'/>
+    <controller type='scsi' index='3' model='virtio-scsi'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

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,