Re: Testing nested virtualization

[Daniel Bareiro <daniel-listas@gmx.net>]

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Hi, Alexander.

On Saturday, 02 January 2010 14:11:04 +0100,
Alexander Graf wrote:

> >> In this guest I'm using Linux 2.6.32, with userspace kvm-85 of
> >> backports. For the VM booted within of 'test', I am using a qcow2
> >> file. But when connecting via VNC, the boot process is hung in
> >> "Press for F12 boot menu". Sometimes it gets to pass this instance
> >> and I see the Debian install menu, but while I cross the options,
> >> it is hung.

> > Also I was trying to use qemu-kvm-0.12.1.1 with to Linux 2.6.32 in
> > guest within 'test'. And here it happens something similar.
> > Sometimes I get to select the option of the menu of the installer,
> > but after boot, the installation is hung again.
 
> Can your host do nested paging? Shadow shadow paging can be a bit
> flaky at times :-(.

Hmmm... is there some way to verify that?

The CPUs model is AMD Athlon 64 X2 Dual Core 3800+. Perhaps some flag
related? In such case, these are the available ones in the host:

flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
fxsr_opt rdtscp lm 3dnowext 3dnow rep_good pni cx16 lahf_lm cmp_legacy
svm extapic cr8_legacy


When loading the module with "kvm_amd nested=1", /var/log/messages
registers the following thing:

kvm: Nested Virtualization enabled


And these are flags in test, booting with -enable-nesting:

flags           : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm up pni cx16
hypervisor lahf_lm svm


Thanks for your reply.

Regards,
Daniel
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