[Qemu-devel] Super nested KVM

[Richard W.M. Jones]

If you have odd Intel or AMD hardware, I'd appreciate if you could
test my disk image which recursively launches nested KVM until
something breaks:

  http://rwmj.wordpress.com/2014/07/03/super-nested-kvm/#content

FWIW:

* AMD FX(tm)-8320 Eight-Core Processor:

L3 guest fails to boot with

[   30.769000] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000180
[   30.769000] IP: [<ffffffff810be871>] __queue_work+0x41/0x4e0

* Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz [Sandybridge]:

L4 guest either hangs very early in boot, or is so slow that it
makes no visible progress.

There's also a TCG-only mode, but the test ran so slowly as to be
inconclusive.  I might leave it going overnight.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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