[CentOS-virt] Nested KVM issue

Sun Aug 14 14:17:55 UTC 2016
Laurentiu Soica <laurentiu at soica.ro>

More details on the subject:

I suppose it is a nested KVM issue because it raised after I enabled the
nested KVM feature. Without it, anyway, the second level VMs are unusable
in terms of performance.

I am using CentOS 7 with:

kernel: 3.10.0-327.22.2.el7.x86_64

on both the baremetal and the compute VM.

The only workaround now is to shutdown the compute VM and start it back
from baremetal with virsh start.
A simple restart of the compute node doesn't help. It looks like the
qemu-kvm process corresponding to the compute VM is the problem.


În dum., 14 aug. 2016 la 00:19, Laurentiu Soica <laurentiu at soica.ro> a

> Hello,
> I have an OpenStack setup in virtual environment on CentOS 7.
> The baremetal has *nested KVM* enabled and 1 compute node as a VM.
> Inside the compute node I have multiple VMs running.
> After about every 3 days the VMs get inaccessible and the compute node
> reports high CPU usage. The qemu-kvm process for each VM inside the compute
> node reports full CPU usage.
> Please help me with some hints to debug this issue.
> Thanks,
> Laurentiu
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