Wednesday, July 5, 2017

libvirt v.3.5.0 released

libvirt v3.5.0 is now available for download here.
A new z Systems-specific feature is the introduction of parameter loadparm for boot devices.
The loadparm parameter can be used to select a specific boot configuration from the zipl menu when IPL’ing/booting from a boot device, similar to what the chreipl command does in Linux on z.
Being able to select a configuration from multiple boot configurations provides more flexibility and allows to recover from error situations by booting a "last known good configuration".
To use, specify the loadparm attribute for a boot device in a guest's XML as follows:

   <disk>
      <boot order='1' loadparm='3'/>
      [...]
   </disk>


Note that this feature requires the forthcoming QEMU 2.10 release.

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