I'm using a new stable Debian Jessie (minimal installation without DE and standard utilities).
First of all, I set 'enabled' for Intel virtualisation in BIOS and installed qemu-kvm as usual:
# aptitude install uml-utilities bridge-utils qemu-kvm virtinst libvirt-bin
Then I configured bridge in /etc/network/interfaces:
auto br0 iface br0 inet dhcp bridge_ports eth1 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off
Then I installed virtual guest, which works fine.
The problem is that when I want to reboot my host system, I type
reboot, but computer completely shuts down (all HDD, power supply, fans etc) and then on again 3 seconds later.
Previously (with Debian Wheezy) the same computer could restart without completely turning off.
Message' KVM: disabled by BIOS' during system start (but not every time). Intel virtualisation and VT-d options in BIOS still enabled.
Message 'Running guests on default URI: no running guests'. This message disappears since I edit /etc/systemd/system/multi-user.target.wants/libvirt-guests.service:
But my computer still completely shuts down when every reboot.