nova/releasenotes/notes/Use-virt-as-machine-type-fo...

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---
upgrade:
- |
The default QEMU machine type for ARMv7 architecture is now changed
to ``virt`` (from the older ``vexpress-a15``, which is a particular
ARM development board). The ``virt`` board is the recommended
default for ARMv7, which is explicitly designed to be
used with virtual machines. It is more flexible, supports PCI and
'virtio' devices, has decent RAM limits, and so forth. For
pre-existing Nova guests on ARMv7 to acquire the ``virt`` machine
type: (a) upgrade Nova with this fix; (b) explicitly start and stop
the guests, then they will pick up the 'virt' machine type.