[Qemu-devel] [Bug 688085] Re: Guest kernel hang during boot when KVM is active on i386 host

[Brian Murray <brian@ubuntu.com>]

** Also affects: kvm (Ubuntu Maverick)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Maverick)
   Importance: Undecided
       Status: New

** Also affects: qemu (Ubuntu Maverick)
   Importance: Undecided
       Status: New

** Also affects: qemu-kvm (Ubuntu Maverick)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/688085

Title:
  Guest kernel hang during boot when KVM is active on i386 host

Status in meego project:
  Unknown
Status in QEMU:
  Fix Released
Status in qemu-kvm:
  Fix Released
Status in “kvm” package in Ubuntu:
  Invalid
Status in “linux” package in Ubuntu:
  In Progress
Status in “qemu” package in Ubuntu:
  Invalid
Status in “qemu-kvm” package in Ubuntu:
  Invalid
Status in “kvm” source package in Maverick:
  New
Status in “linux” source package in Maverick:
  New
Status in “qemu” source package in Maverick:
  New
Status in “qemu-kvm” source package in Maverick:
  New

Bug description:
  Binary package hint: qemu

Guest kernel hang during boot when KVM is active on i386 host

See the patch.
http://www.spinics.net/lists/kvm/msg40800.html

How to reproduce:
1. install Maversick x86 (not amd64)
2. ensure you have  kvm support in processor
3. kvm -kernel /boot/initrd.img-2.6.35-24-generic-pae
4. kvm -no-kvm -kernel /boot/initrd.img-2.6.35-24-generic-pae works OK.

SRU Justification:
Impact: Users cannot boot KVM guests on i386 hosts
2. How bug addressed:  The upstream commit at http://www.spinics.net/lists/kvm/msg40800.html fixed it
3. Patch:  A kernel patch is attached to this bug.
4. Reproduce: boot an i386 kernel on a kvm-capable host.  Try to boot a kvm guest.
5. Regression potential: since this is cherrypicking a commit from a future upstream which had already been changed, regression is possible.  However if there is a regression, it should only affect users of KVM on i386 hosts, which currently fail anyway.