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

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

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?

 -George

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