kernel-packages team mailing list archive

[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

Trying to summarize my testing so far:

Host: saucy 64bit, 1rst level saucy 32bit, 2nd level saucy 32bit:
- 2nd level guest did not start when using qemu-system-x86_64:
  - This may be some regression or feature, not sure, yet.
- Using qemu only (defaulting to same arch) the 2nd level guest starts:
  - I saw many NMI (21 / 31) messages which looks not good.
  - One run completed, the other caused a double fault in 2nd level.

Host: Saucy 64bit, 1rst level saucy 64bit, 2nd level saucy 32bit:
- Not ultimately required, but also using qemu (not qemu-system-x86_64).
- Works much better but doing many loops at some point there is a double
   fault too.

Host: Quantal 64bit, 1rst level saucy 32bit, 2nd level saucy 32bit:
- Had the lockups when using qemu-system-x86_64.
- Currently completed 3 runs (needs more time) with qemu only call.

Host: Quantal 64bit, 1rst level saucy 64bit, 2nd level saucy 32bit:
- With qemu only call now completed run 7.

This is not conclusive yet as I need more runs, but Quantal as host
seems more stable than Saucy. The question is whether this is also true
for Precise as host (unfortunately my test HW is too new, so its wired
network is not supported back in Precise). James, maybe you want to try
that. One critical change seems to be the use of qemu instead of qemu-
system-x86_64. I am not sure whether starting a 64bit system with
hardware acceleration from a 32bit system is something that is supposed
to work. Well the emulated cpu likely claims 64bit capability but then I
am not sure whether that combo is so well tested with respect to other
interfaces.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1208455

Title:
  general protection fault running apt-get inside double nested kvm VM

Status in “linux” package in Ubuntu:
  In Progress
Status in “qemu-kvm” package in Ubuntu:
  New
Status in “linux” source package in Saucy:
  In Progress
Status in “qemu-kvm” source package in Saucy:
  New

Bug description:
  Attempting to run apt-get in a nested vm hosted in OpenStack results
  in a  general protection fault in the kernel in the nested VM.

To manage notifications about this bug go to:
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