@Andrew: thanks. Hard to tell what the root cause is there - might need more logs. The only obvious concern I see here is:
[ 0.062805] acpi PNP0A08:00: Bus 0000:00 not present in PCI namespace
Would you mind trying a newer guest (bionic/cosmic) and seeing if that is any better? The xenial GA kernel is lacking a lot of ACPI support, and maybe libvirt has grown to expect more.
@Andrew: thanks. Hard to tell what the root cause is there - might need more logs. The only obvious concern I see here is:
[ 0.062805] acpi PNP0A08:00: Bus 0000:00 not present in PCI namespace
Would you mind trying a newer guest (bionic/cosmic) and seeing if that is any better? The xenial GA kernel is lacking a lot of ACPI support, and maybe libvirt has grown to expect more.