On Mon, Dec 11, 2017 at 02:28:31PM +0000, Phill Bandelow wrote:
> Hi,
>
> We seem to be hitting an issue where libguestfs keeps hanging. virt-resize,
> guestmount etc.. never complete. If we set
> LIBGUESTFS_BACKEND_SETTINGS=force_tcg it completes. I've seen this issue before where the UART hangs, and I can't put my
>
> The issue starts when updating to CentOS 7.4 (CentOS 7.3 work fine). It
> doesn't seem to affect all 7.4 hypervisors and the only similarity that we
> have found is that they all use NVMe drives.
finger on what was causing it right now.
At any rate there's a few things you can look into:
(1) Try with LIBGUESTFS_BACKEND=direct (without forcing TCG).
(2) Is it using nested KVM? Is nested KVM enabled in the KVM
module in the host kernel:
# systool -m kvm_intel -v | grep nested
(should say "Y" if yes)
If nested KVM is enabled, you can disable it (probably requires a
reboot unfortunately). Or if disabled, try enabling it.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines. Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v