Unable to attach a cdrom device to guest domain - Red Hat Customer Portal

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Issue

It is impossible to block attach a cdrom device to a PV guest domain if the dom0 is running RHEL 5.6.

Install RHEL 5.6 with Xen Hypervisor.
Install a PV guest domain named "domu" using virt-manager (could be RHEL 5.6 or RHEL 5.5)
Put a CD/DVD into DVD/CD drive
Try following command,

# virsh attach-disk domu /dev/cdrom xvde

or 

# xm block-attach domu /dev/cdrom /dev/xvde

Although The attach-disk or block-attach command returns without error. The device /dev/xvde isn't created in guest domain.

Environment

Red Hat Enterprise Linux 5.6
kernel-xen 2.6.18-238.el5
Xen

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