QEMU v2.12 released

QEMU v2.12 is out. Here are the highlights from a KVM on Z perspective:

• Added support for an interactive bootloader. As always, we strongly recommend to use the existing support in libvirt.
  To enable/disable, add the following element to your guest definition:
  
     <os>
       <bootmenu enable=’yes|no’ timeout=’n’/>
       ...
     </os>
  
  The timeout parameter specifies a timeout in milliseconds after which the default entry is chosen.
  Alternatively, set attribute loadparm to PROMPT to enable the boot menu without timeout in the respective disk's element:
  
     <disk ...>
       <boot order=’1’ loadparm=’PROMPT’/>
       ...
     </disk>
  
  Example:
  To enable the boot menu for 32 seconds for a guest using a libvirt
  domain XML format follows:
  
     <domain type=’kvm’>
       <os>
         <bootmenu enable=’yes’ timeout=’32000’/>
         ...
       </os>
• Exposure of guest crash information: When a guest is started using libvirt and crashes due to disabled wait, wrong interrupts or a program check loop, libvirt will print the information to the guest’s log, typically located at /var/log/libvirt/qemu.
  E.g. a crash due to a disabled wait results in an entry as follows:
  
     s390: psw-mask=’0xXXXXXXXXXXXXXXXX’, psw-addr=’0xXXXXXXXXXX
           XXXXXX’,crash reason: disabled wait
  
  Requires  libvirt v4.2.
• Added support for guests with more than 8TB of memory.