yahoo-eng-team team mailing list archive

[chengsheng <1903822@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When the vm does not specify a host for live migration, it will call
libvirt's compareCPU() to compare cpu features, which is not very
useful. For example, when the kernel version of the host is different,
compareCPU() passes the check, but in fact the cpu features of the host
may be different, When the vm is live migrated to this host, a startup
error will occur.

Steps to reproduce:
1. Prepare two compute nodes with the same cpu features, the system is centos7.6 and the kernel is 3.10.
2. It is normal not to specify host live migration between two nodes.
3. Upgrade the kernel of one of the nodes to 4.19.
4. Do not specify the host live migration, the vm migrates from one node to another node, but an error is reported during startup, and the error log is as follows:
    Live Migration failure: operation failed: guest CPU doesn't match specification: missing features: xsaves: libvirtError: operation failed: guest CPU doesn't match specification: missing features: xsaves

** Affects: nova
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1903822

Title:
   live migration fails due to host cpu features different

Status in OpenStack Compute (nova):
  New

Bug description:
  When the vm does not specify a host for live migration, it will call
  libvirt's compareCPU() to compare cpu features, which is not very
  useful. For example, when the kernel version of the host is different,
  compareCPU() passes the check, but in fact the cpu features of the
  host may be different, When the vm is live migrated to this host, a
  startup error will occur.

  Steps to reproduce:
  1. Prepare two compute nodes with the same cpu features, the system is centos7.6 and the kernel is 3.10.
  2. It is normal not to specify host live migration between two nodes.
  3. Upgrade the kernel of one of the nodes to 4.19.
  4. Do not specify the host live migration, the vm migrates from one node to another node, but an error is reported during startup, and the error log is as follows:
      Live Migration failure: operation failed: guest CPU doesn't match specification: missing features: xsaves: libvirtError: operation failed: guest CPU doesn't match specification: missing features: xsaves

To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1903822/+subscriptions