[libvirt-users] Nested KVM: L0 guest produces kernel BUG on wakeup from managed save (while a nested VM is running)

[Kashyap Chamarthy]

On Thu, Feb 08, 2018 at 06:44:43PM +0100, Florian Haas wrote:
> On Thu, Feb 8, 2018 at 1:07 PM, David Hildenbrand <david at redhat.com> wrote:
> > We should certainly document what I have summaries here properly at a
> > central palce!
> 
> Please review the three edits I've submitted to the wiki:
> https://www.linux-kvm.org/page/Special:Contributions/Fghaas
> 
> Feel free to ruthlessly edit/roll back anything that is inaccurate.
> Thanks!

I've made some minor edits to clarify a bunch of bits, and a link to the
Kernel doc about Intel nVMX.  (Hope that looks fine.)

You wrote: "L2...which does no further virtualization".  Not quite true
— "under right circumstances" (read: sufficiently huge machine with tons
of RAM), L2 _can_ in turn L3. :-)

Last time I checked (this morning), Rich W.M. Jones had 4 levels of
nesting tested with the 'supernested' program[1] he wrote.  (Related
aside: This program is packaged it as part of 2016 QEMU Advent
Calendar[2] -- if you want to play around on a powerful test machine
with tons of free memory.)

[1] http://git.annexia.org/?p=supernested.git;a=blob;f=README
[2] http://www.qemu-advent-calendar.org/2016/#day-13

-- 
/kashyap