Re: [Xen-devel] Nested SVM (was: Re: 4.2 TODO update)

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2012-03-13 at 11:40 +0000, Christoph Egger wrote:
> On 03/12/12 13:11, Ian Campbell wrote:
> >        * Nested-virtualisation (currently should be marked experimental,
> >          likely to release that way? Consider nested-svm separate to
> >          nested-vmx. Nested-svm is in better shape)
> 
> I tested the following scenarios:
> 
> - Linux on Xen on Xen
> - NetBSD on Xen on Xen
> - KVM (+ KVM-guest) on Xen
> - KVM (+ KVM-guest) on Xen on Xen (yeah, l3 guest works!)
> - Windows 7 (both 32bit and 64bit) on Xen on Xen
> - Win7 XP mode on Windows 7 (both 32bit and 64bit) on Xen
> - Hyper-V (64bit) on Xen
> - VMware ESX (64bit) on Xen

Wow, that's far more combinations than I expected.

I wonder where we can document this, is there a nested-HVM page on the
wiki perhaps?

> Issues:
> - Hyper-V SMP not tested, only UP
> - Win7 XP mode often quits with BSOD, 

Hrm, this one sounds quite important? I expect Win7 XP mode is the
primary real world use case for Nested-HVM?

> but when it boots playing Solitair makes fun :-)

;-)

> - L2 guest screen doesn't refresh in graphical mode
>    (VGA text mode works),
>    workaround: dis- and re-establish the VNC connection,
>    between two VNC reconnects you can work like with your
>    monitor powered off

Uh, that also sounds pretty critical. Does it also effect the Win7 XP
mode usecase?

Between those two issues I think removing the experimental tag sounds
premature?

Ian.


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