Re: [Xen-devel] Nested Virt - Xen 4.4 through 4.6 - Hyper-V; Can't boot after enabling Hyper-V

["Li, Liang Z" <liang.z.li@xxxxxxxxx>]

> On Tue, Apr 7, 2015 at 2:42 AM, mailing lists <thelists@xxxxxxxxx> wrote:
> > Hi --
> >
> > I've been trying to get nested virtualization working with Xen so that
> > I could boot Windows and use Hyper-V related features, however I have
> > not had much success.  Using Windows 8.1 or Windows 2012r2, I'm able
> > to install Windows, select and install Hyper-V features, and start
> > rebooting.  However, at that point, the Windows VM only partially
> > boots, then drops me to a screen stating:
> >
> > Your PC needs to restart.
> > Please hold down the power button.
> > Error Code: 0x0000001E
> > Parameters:
> > 0xFFFFFFFFC0000096
> > 0xFFFFF80315430485
> > 0x0000000000000000
> > 0x0000000000000000
> >
> >
> > Restarting does not yield any different results.
> >
> > I've set up Xen in accordance with the notes for patches and config
> > options
> > here:
> >
> > http://wiki.xenproject.org/wiki/Nested_Virtualization_in_Xen
> >
> > Trying Xen 4.4.2 stable, 4.5.1 staging, and 4.6 staging.  I applied
> > the patch labeled (2/2) from the wiki link above, compiled, and used
> > the three options provided for the DomU running Windows (hap,
> > nestedhvm, and cpuid mask).  Windows installs and allows me to turn on
> > HyperV features on all versions of Xen listed above, however all give
> > the same or similar message on reboot... I'm never able to get to a running
> state.
> >
> > I've tried this on two separate systems.  One has an Intel E5-1620 v2,
> > and the other is a n E5-1650 (original, v1 I guess).  All the
> > virtualization options are enabled in the BIOS.
> >
> > If the cpuid mask is removed from the DomU config, Windows boots,
> > however I'm unable to start any virtual machines (there was a message
> > in the Windows event log about a component not being started in regards
> to Hyper V).
> >
> > Has anyone else run into similar issues?  Any thoughts on next steps?
> 
> 
> CC'ing Liang Z to see if he has any ideas.
> 
> Liang, I'm pretty sure you guys are testing HyperV internally, right?

+ Yang Z.      Sorry, I know little about that.   May be Yang can give you some 
help.

Liang  
> 
>  -George
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