qemu: Forbid 'cdrom' on 'sd' bus

We can't set the type of the device on the 'sd' bus and realistically a
cdrom doesn't even make sense there. Forbid it.

Note that the output of in disk-cdrom-bus-other.x86_64-latest.args
switched to blockdev as it's no longer locked out due to use of a disk
on 'sd' bus.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_validate.c

@@ -1946,9 +1946,10 @@ qemuValidateDomainDeviceDefDiskFrontend(const virDomainDiskDef *disk,
     }
 
     if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM &&
-        disk->bus == VIR_DOMAIN_DISK_BUS_VIRTIO) {
+        (disk->bus == VIR_DOMAIN_DISK_BUS_VIRTIO ||
+         disk->bus == VIR_DOMAIN_DISK_BUS_SD)) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                       _("disk type 'virtio' of '%s' does not support ejectable media"),
+                       _("disk type of '%s' does not support ejectable media"),
                        disk->dst);
         return -1;
     }

tests/qemuxml2argvdata/disk-cdrom-bus-other.x86_64-latest.args

@@ -28,14 +28,13 @@ file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
 -no-acpi \
 -boot strict=on \
 -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
--drive file=/root/boot.iso,format=raw,if=none,id=drive-usb-disk0,readonly=on \
+-blockdev '{"driver":"file","filename":"/root/boot.iso",\
--device usb-storage,bus=usb.0,port=1,drive=drive-usb-disk0,id=usb-disk0,\
+"node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"}' \
+-blockdev '{"node-name":"libvirt-2-format","read-only":true,"driver":"raw",\
+"file":"libvirt-2-storage"}' \
+-device usb-storage,bus=usb.0,port=1,drive=libvirt-2-format,id=usb-disk0,\
 removable=off \
--drive if=none,id=drive-usb-disk1,readonly=on \
+-device usb-storage,bus=usb.0,port=2,id=usb-disk1,removable=off \
--device usb-storage,bus=usb.0,port=2,drive=drive-usb-disk1,id=usb-disk1,\
-removable=off \
--drive file=/root/boot2.iso,format=raw,if=sd,index=2,readonly=on \
--drive if=sd,index=3,readonly=on \
 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
 resourcecontrol=deny \
 -msg timestamp=on

tests/qemuxml2argvdata/disk-cdrom-bus-other.xml

@@ -26,17 +26,6 @@
       <target dev='sdb' bus='usb'/>
       <readonly/>
     </disk>
-    <disk type='file' device='cdrom'>
-      <driver name='qemu' type='raw'/>
-      <source file='/root/boot2.iso'/>
-      <target dev='sdc' bus='sd'/>
-      <readonly/>
-    </disk>
-    <disk type='file' device='cdrom'>
-      <driver name='qemu' type='raw'/>
-      <target dev='sdd' bus='sd'/>
-      <readonly/>
-    </disk>
     <controller type='usb' index='0'/>
     <controller type='ide' index='0'/>
     <controller type='pci' index='0' model='pci-root'/>

tests/qemuxml2xmloutdata/disk-cdrom-bus-other.xml

@@ -26,17 +26,6 @@
       <target dev='sdb' bus='usb'/>
       <readonly/>
     </disk>
-    <disk type='file' device='cdrom'>
-      <driver name='qemu' type='raw'/>
-      <source file='/root/boot2.iso'/>
-      <target dev='sdc' bus='sd'/>
-      <readonly/>
-    </disk>
-    <disk type='file' device='cdrom'>
-      <driver name='qemu' type='raw'/>
-      <target dev='sdd' bus='sd'/>
-      <readonly/>
-    </disk>
     <controller type='usb' index='0'>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
     </controller>