Public bug reported:
I am reporting this bug against qemu-system-x86=1:2.2+dfsg-5expubuntu9.3~cloud0
in the Ubuntu cloud archive.
# lsb_release -rd
Description: Ubuntu 14.04.3 LTS
Release: 14.04
# apt-cache policy qemu-system-x86
qemu-system-x86:
Installed: 1:2.3+dfsg-5ubuntu4~cloud0
Candidate: 1:2.3+dfsg-5ubuntu4~cloud0
What is happening:
Version 1:2.2+dfsg-5expubuntu9.3~cloud0 of qemu-system and qemu-system-x86_64
seems to be dropping the svm (AMD nested virtualization) flag from virtual
machines, despite it being specified in the CPU type. So nested virtualisation
has stoppped working.
What I expect to happen:
svm CPU flag to be passed through to guests.
Version 1:2.3+dfsg-5ubuntu4~cloud0 also drops the svm flag.
Version 2.0.0+dfsg-2ubuntu1.18 passes the CPU flag through fine.
This has been tested with libvirt-bin version 1.2.12-0ubuntu14. The processor
is Version: AMD Opteron(TM) Processor 6238.
# cat /sys/module/kvm_amd/parameters/nested
1
# modinfo kvm_amd | grep nested
parm: nested:int
The qemu command line includes the following cpu argument::
-cpu
Opteron_G4,+perfctr_nb,+perfctr_core,+topoext,+nodeid_msr,+lwp,+wdt,+skinit,+ibs,+osvw,+cr8legacy,+extapic,+c
mp_legacy,+fxsr_opt,+mmxext,+osxsave,+monitor,+ht,+vme
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to qemu in Ubuntu.
https://bugs.launchpad.net/bugs/1494602
Title:
qemu-system-x86 nested virtualisation is broken on AMD system
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1494602/+subscriptions
--
Ubuntu-server-bugs mailing list
Ubuntu-server-bugs@lists.ubuntu.com
Modify settings or unsubscribe at:
https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
