On Thu, May 09, 2013 at 11:49:05AM +, 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.
>
>for an example,a VM is running with the following configuration
> information:
> ...
>
> hvm
>
>
>
> ...
>use command "virsh edit " to modify it:
> ...
>
> hvm
>
>
>
> ...
> With the changing, the VM is expected to start from cdrom, when execute the
> command "virsh reboot".
> But the fact is that the modify does not take effect, the VM is still start
> from hd.
"virsh edit" changes the persistent configuration of a guest, and as such this
has no effect on the runtime state of the guest. The changes will only take
effect at the next cold boot. 'virsh reboot' does a warm boot, hence won't see
the changes.
> Well, it will take effect if I use command "virsh shutdown" and "virsh start"
> instesad of "virsh reboot".
> We are wondering if there have any other ways to take the online modify
> effect.
> What is the next step going on with the command "virsh edit" on KVM Platform?
> Any ideas?
AFAIK, there is no way to programatically change the BIOS boot order for
a running QEMU process.
Daniel
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