[libvirt-users] Fail in virDomainUpdateDeviceFlags (libvirt-4.0.0 + Qemu-kvm 2.9.0 + Ceph 10.2.10)

[Peter Krempa]

On Tue, Feb 27, 2018 at 09:53:00 +0100, Michal Privoznik wrote:
> On 02/27/2018 03:06 AM, Star Guo wrote:
> > Hello Everyone,
> > 
> >  
> > 
> > My pc run in CentOS 7.4 and install libvirt-4.0.0 + Qemu-kvm 2.9.0 + Ceph
> > 10.2.10 ALL-in-One.
> > 
> >  
> > 
> > I use python-sdk with libvirt and run [self.domain.updateDeviceFlags(xml,
> > libvirt.VIR_DOMAIN_AFFECT_LIVE)] on CDROM (I want to change media path).
> > However, I enable libvirt debug log , the log as below:
> > 
> > <snip/>
> >
> > I see the flow is virDomainUpdateDeviceFlags -> qemuMonitorChangeMedia, but
> > the cephx auth is drop, so make update error. Anybody meet this error? 
> 
> Yes, this is a libvirt bug. I think this fixes the issue:
> 
> diff --git i/src/qemu/qemu_driver.c w/src/qemu/qemu_driver.c
> index 96454c17c..0e5ad9971 100644
> --- i/src/qemu/qemu_driver.c
> +++ w/src/qemu/qemu_driver.c
> @@ -7842,6 +7842,8 @@ qemuDomainChangeDiskLive(virDomainObjPtr vm,
>                           virQEMUDriverPtr driver,
>                           bool force)
>  {
> +    virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
> +    qemuDomainObjPrivatePtr priv = vm->privateData;
>      virDomainDiskDefPtr disk = dev->data.disk;
>      virDomainDiskDefPtr orig_disk = NULL;
>      virDomainDeviceDef oldDev = { .type = dev->type };
> @@ -7850,6 +7852,9 @@ qemuDomainChangeDiskLive(virDomainObjPtr vm,
>      if (virDomainDiskTranslateSourcePool(disk) < 0)
>          goto cleanup;
>  
> +    if (qemuDomainPrepareDiskSource(disk, priv, cfg) < 0)
> +        goto cleanup;

It's not that easy. At this point you also need to hotplug the 'secret'
object. Without that the command will fail as the secret object
referenced by the storage source definition will not be present.

There should be a upstream bugzilla tracking this and I'm planing to fix
this during my work on using the new blockdev stuff in qemu.
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