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[Qemu-devel] Super nested KVM

From: Richard W.M. Jones
Subject: [Qemu-devel] Super nested KVM
Date: Thu, 3 Jul 2014 18:34:33 +0100
User-agent: Mutt/1.5.20 (2009-12-10)

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:



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

L3 guest fails to boot with

[   30.769000] BUG: unable to handle kernel NULL pointer dereference at 
[   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.


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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