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nova 如何修改 libvirt.xml 及自定义 xml 文件修改 nova 代码支持 vhost
这篇文章主要介绍 nova 如何修改 libvirt.xml 及自定义 xml 文件修改 nova 代码支持 vhost，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
interface type= bridge
mac address= 00:1a:4a:4d:63:a0 /
source bridge= sdcos-vmnet /
model type= virtio /
filterref filter= vdsm-no-mac-spoofing /
link state= up /
bandwidth
/bandwidth
address type= pci domain= 0x0000 bus= 0x00 slot= 0x03 function= 0x0 /
driver name= qemu /
/interface
interface type= bridge
mac address= fa:16:3e:ea:69:50 /
model type= virtio /
source bridge= qbr3bcc4870-b3 /
target dev= tap3bcc4870-b3 /
driver name= qemu / #加上此配置文件，则启动的虚拟机参数中就会有 vhost=off
/interface
修改 nova 代码支持：
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
修改为：
if model == virtio and CONF.libvirt.virt_type == qemu :
driver = qemu
driver = qemu // 增加此句，代表永远为 qemu
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