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Re: [Qemu-devel] "virsh edit" failed to take effect on KVM
From: |
Laszlo Ersek |
Subject: |
Re: [Qemu-devel] "virsh edit" failed to take effect on KVM |
Date: |
Thu, 09 May 2013 14:58:56 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 |
On 05/09/13 13:42, 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:
> ...
> <os>
> <type arch='x86_64'>hvm</type>
> <boot dev='hd'/>
> <bootmenu enable='yes'/>
> </os>
> ...
> use command "virsh edit " to modify it:
> ...
> <os>
> <type arch='x86_64'>hvm</type>
> <boot dev='cdrom'/>
> <bootmenu enable='yes'/>
> </os>
> ...
> 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.
> 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?
Under Xen, "xm reboot" (or, more likely, "xl reboot" recently), which is
what I expect "virsh reboot" to translate to, always creates a brand new
domain. Therefore domain config changes take effect.
Under KVM the same VM instance continues to run, it just goes through an
emulated reset.
Laszlo