On 05/09/2013 05:42 AM, Gonglei (Arei) wrote:
> Hi all,
>    we use the command "virsh edit"  to modify the VM configuration information online on KVM Platform(libvirt-1.0.0 and qemu-1.4), 
> but it does not take effect after reboot. However, it works fine on Xen Platform.

This sort of question belongs best on libvirt-users@redhat.com
(libvirt-list-request is not the right list address, and your question
isn't quite relevant to qemu-devel).

> With the changing, the VM is expected to start from cdrom, when execute the command "virsh reboot".

'virsh reboot' triggers a software reboot (reusing the same existing
qemu process); but 'virsh edit' only affects what will take place on a
hard boot (creation of a new qemu process).

> But the fact is that the modify does not take effect, the VM is still start from hd. 
> Well, it will take effect if I use command "virsh shutdown" and "virsh start" instesad of "virsh reboot".

Correct, because that sequence spawns a new qemu process.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org