Why host device disappear in libvirt doman xml?

[陈新隆]

<https://stackoverflow.com/posts/73854544/timeline>

I'm using Kubevirt to manage my virtual machine instances. When I using
Kubevirt to create a vm(with two GPUs), kubevirt will generate a libvirt
guest domain xml for this vm which includes two GPUs, the domain xml as
follow :

    <hostdev mode='subsystem' type='pci' managed='no'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x83' slot='0x00' function='0x0'/>
      </source>
      <alias name='ua-gpu-gpu0'/>
      <address type='pci' domain='0x0000' bus='0x06' slot='0x00'
function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='no'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x84' slot='0x00' function='0x0'/>
      </source>
      <alias name='ua-gpu-gpu1'/>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00'
function='0x0'/>
    </hostdev>

No one ever edit this domain xml, but these two hostdev element disappeared
in the domain xml. During this time, I've run the gpu_burn command to do a
stress test for these two GPUs.

My question is :

   - when will libvirtd change the guest domain xml ?
   - why libvirtd delete these two hostdev from domain xml ?
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