I think this can be easily removed from the UI only.

The virt-install documentation needs to be fixed too.

There is bug 1038926 to record all the GUI of virt-manager which is not supported by qemu-kvm on rhel7.0.The cdrom has mentioned in comment 7 in that bug.

Tested with:
virt-manager-0.10.0-19.el7.noarch

Steps:
1.Test create a new guest:
Open virt-manager,click to create a new guest,choose "Local install media(ISO image or CDROM),click "Forward",on the next GUI,"use CDROM or DVD" has been disabled.

2.Test add cdrom for an existing guest:
For an existing guest,click "Add hardware"->Storage->"IDE CDROM"->"Finish".

On the guest hardware details GUI,click "IDE CDROM"->"Connect"->"CDROM or DVD" option has been disabled.

3.Test add cdrom for an existing guest and set storage path as "/dev/cdrom".
For an existing guest,click "Add hardware"->Storage->"IDE CDROM"->set storage Path as "/dev/cdrom"->"Finish".

Try to boot the guest,will get error:
Error starting domain: internal error: process exited while connecting to monitor: qemu-kvm: -drive file=/dev/cdrom,if=none,id=drive-ide0-1-0,readonly=on,format=raw,cache=none: could not open disk image /dev/cdrom: Driver 'host_cdrom' is not whitelisted

For item 3,is it necessary to disable /dev/cdrom as storage path?

I think it is fine to allow users to set any desired value and let libvirt complain in case it is not valid.  As you've showed, This seems sufficient when they try to manually use "/dev/cdrom".

(In reply to Giuseppe Scrivano from comment #7)
> I think it is fine to allow users to set any desired value and let libvirt
> complain in case it is not valid.  As you've showed, This seems sufficient
> when they try to manually use "/dev/cdrom".

okay,then I move the bug to VERIFIED.

Added tested with virt-install:
virt-install-0.10.0-19.el7.noarch

[root@localhost ~]# virt-install -n test -r 512 -s 6 --cdrom /dev/sr0 -f /var/lib/libvirt/images/test.img

Starting install...
Allocating 'test.img'                                                                                                                                                 | 6.0 GB  00:00:00     
ERROR    internal error: process exited while connecting to monitor: qemu-kvm: -drive file=/dev/sr0,if=none,id=drive-ide0-1-0,readonly=on,format=raw: could not open disk image /dev/sr0: Driver 'host_cdrom' is not whitelisted


@Giuseppe:
from comment2, you said "The virt-install documentation needs to be fixed too.". But both of the manual doc and help doc did not mention about Physical CDROM was not supported. For example, the first example in manual doc:
...installing from media in the hosts CDROM drive...

         # virt-install \
              --connect qemu:///system \
              --virt-type kvm \
              --name demo \
              --ram 500 \
              --disk path=/var/lib/libvirt/images/demo.img,size=8 \
              --graphics vnc \
              --cdrom /dev/cdrom \
              --os-variant fedora13

The example should be removed.

Do we need to file another bug for the virt-install document update? or you just send a new patch for doc update?

I am going to prepare a new patch to drop that example from the documentation

List the document which need to update I found(check my comments after >>):
1. virt-manager -h
...
--cdrom=CDROM       CD-ROM installation media
...

>>As physical cdrom are not supported, only could be path to an ISO image.

2. man virt-manager
...
       --cdrom=CDROM
         File or device use as a virtual CD-ROM device for fully virtualized guests.  It can be path to an ISO image, or to a CDROM device. It can also be a URL from which to
         fetch/access a minimal boot ISO image. The URLs take the same format as described for the "--location" argument. If a cdrom has been specified via the "--disk" option, and
         neither "--cdrom" nor any other install option is specified, the "--disk" cdrom is used as the install media.
...

>>remove ", or to a CDROM device". Announce that physical cdrom is not supported.

3. Remove the first example in manual doc.

Any other parts you think are related with physical cd/dvd were not supported, please go ahead to update.

1) cannot be changed at this point as it is a localized message (and it looks fine as it is)

I'll drop the reference to the physical CDROM device from the man page.

Verified this issue with:
virt-manager-0.10.0-20.el7.noarch
virt-manager-common-0.10.0-20.el7.noarch
virt-install-0.10.0-20.el7.noarch

1. cdrom option have been update as:
       --cdrom=CDROM
         File to use as a virtual CD-ROM device for fully virtualized guests.  It can be path to an ISO image or a URL from which to fetch/access a minimal boot ISO image. The URLs
         take the same format as described for the "--location" argument. If a cdrom has been specified via the "--disk" option, and neither "--cdrom" nor any other install option is
         specified, the "--disk" cdrom is used as the install media.

It looks fine.

2. The physical cdrom example have been removed.

So change the status from 'ON_QA' to 'VERIFIED'

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.

*** Bug 1188527 has been marked as a duplicate of this bug. ***