How nova modifies libvirt.xml and customizes xml files to modify nova code to support vhost

This article mainly introduces how nova modifies libvirt.xml and custom xml files to modify nova code to support vhost. The article is very detailed and has a certain reference value. Interested friends must read it!

# with this configuration file, there will be vhost=off in the parameters of the started virtual machine.

Modify nova code support:

Def get_config (self, instance, vif, image_meta, inst_type):

Conf = vconfig.LibvirtConfigGuestInterface ()

# Default to letting libvirt / the hypervisor choose the model

Model = None

Driver = None

# If the user has specified a 'vif_model' against the

# image then honour that model

If image_meta:

Vif_model = image_meta.get ('properties'

{}) .get ('hw_vif_model')

If vif_model is not None:

Model = vif_model

# Else if the virt type is KVM/QEMU, use virtio according

# to the global config parameter

If (model is None and

CONF.libvirt.virt_type in ('kvm',' qemu') and

CONF.libvirt.use_virtio_for_bridges):

Model = "virtio"

# Workaround libvirt bug, where it mistakenly

# enables vhost mode, even for non-KVM guests

If model = = "virtio" and CONF.libvirt.virt_type = = "qemu":

Driver = "qemu"

Modified to:

If model = = "virtio" and CONF.libvirt.virt_type = = "qemu":

Driver = "qemu"

Driver = "qemu" / / add this sentence to represent always qemu

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