Re: [Xen-devel] nested virtualization test report for Xen 4.3-RC1

[konrad wilk <konrad.wilk@xxxxxxxxxx>]

On 6/27/2013 9:27 AM, Ren, Yongjie wrote:
> > -----Original Message-----
> > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx]
> > Sent: Thursday, June 27, 2013 8:47 PM
> > To: George Dunlap
> > Cc: Ren, Yongjie; Xu, Dongxiao; xen-devel; Zhang, Xiantao
> > Subject: Re: [Xen-devel] nested virtualizaiton test report for Xen 4.3-RC1
> >
> > On Thu, Jun 27, 2013 at 12:37:56PM +0100, George Dunlap wrote:
> > > On Fri, May 10, 2013 at 12:07 PM, Ren, Yongjie <yongjie.ren@xxxxxxxxx>
> > wrote:
> > > > Hi All,
> > > > This the a nested virtualization test report for Xen 4.3-RC1 on Intel
> > hardware. We use Linux 3.9.1 as Dom0.
> > > > a. Virtual EPT and VMCS shadowing features can work fine.
> > > > b. Xen, KVM and VMware can basically work on top of L0 Xen.
> > > > c. 32bit/64bit Linux and Windows are covered as L2 guests.
> > > Sorry I just saw this -- thanks for the nice enumeration.
> > >
> > > Two questions.  First, I don't see the Win7 "XP compatibility mode" on
> > > this list -- that would be L0 Xen, L1 Win7, L2 XP.  This seems like
> > > probably the most likely actual real-world use of nested virt.  Is
> > > that on your radar at all?
> So far, I didn't test this case.
> That's a good use case. I'll add this case in my next report about nested virt.
>
> > > Secondly, what do you think is the primary use case for Xen-on-Xen (or
> > > KVM-on-Xen, &c)?  Who would want to use it and why?
> I'm not sure which type of nested virt is more important. But I heard some use 
> cases as following.
>
> 1. public cloud (e.g. Amazon EC2: if they can provide virtual VMX to the VMs, 
> that can be a value-added service.)
>
> 2. QA: Nested virt can make QAs easy to set up the testing env (especially: 
> virt/cloud areas).
> In a Ovirt Workshop, I heard some guys have been testing Ovirt in KVM nested 
> virtualization.
> Some OpenStack guys also told me that they want to test OpenStack in a VM not 
> on physical host.
And also development. I do use that for some of the low-level assembler 
coding - as I can trigger QEMU to dump the CPU state when printing out 
to the debug port. Quite useful when I was poking in suspend/resume logic.
I was quite happy to see Xen 4.3 + Fedora 18 allow me to nicely boot 
under Xen an Xen HVM OS. Didn't try yet to run an HVM guest within the 
HVM context.
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