Re: [Xen-users] Xen/VMWare co-existence?

[George Lenzer <George.Lenzer@xxxxxxx>]

I'm not sure it would work since Dom0 is not running a Linux kernel with 
"everything on it".  I think VMWare expects access to hardware or 
portions of the kernel that are likely to be missing in a Xen Linux 
kernel.  Supposedly you're not supposed to be able to run QEMU within 
Xen either for similar reasons (especially when you're 
paravirtualised).  Anyone have any more info?
Gary W. Smith wrote:
> Oddball suggestion:
>  
> Download the Linux version of VMWare Server, run it on the Dom0.  Do 
> both at the same time.  I've never tried it but I don't see why it 
> wouldn't work.
>  
>
> ------------------------------------------------------------------------
> *From:* xen-users-bounces@xxxxxxxxxxxxxxxxxxx on behalf of Martin 
> Goldstone
> *Sent:* Thu 8/16/2007 4:02 AM
> *To:* xen-users@xxxxxxxxxxxxxxxxxxx
> *Subject:* [Xen-users] Xen/VMWare co-existence?
>
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> Hi all,
>
> I've been working on a project recently which we want to virtualize.  It
> runs on Windows Server 2003, so my first attempt was to put it in a HVM
> domU.  Sadly, this application requires network performance higher than
> HVM is seemingly capable of.  In the absence of PV drivers for Windows,
> I tried running it on VMWare instead, and I got the extra network
> performance I was looking for.
>
> However, rather than having to have VMware hosts alongside Xen hosts,
> I'd much rather run VMware on the same physical box as Xen.  Obviously I
> can't run it in dom0 or in a PV domU (according to what I've seen on the
> net, the kernel modules VMware uses attempt to force it into ring 0,
> which causes a General Protection Fault), so I've tried running it in a
> HVM domU (CentOS 5, with PV drivers to improve the network performance).
>  I've seen several posts on several lists via Google suggesting that HVM
> domU's have a virtual ring 0, which should suffice.  While I'm no longer
> getting a GPF, the Windows VM still refuses to start, most of the time
> giving me no error message but sometimes it pops up a box telling me
> about an unrecoverable error, unexpected signal 11.  I can't determine
> anything useful from the log file either.
>
> So, the question is, has anyone tried (or had any success with) getting
> VMware and Xen to co-exist on the same box?  If you have, how did you do
> it?  If not, I'd appreciate any ideas as to how to achieve this, or
> (perhaps preferably) any hints to improve network performance under HVM.
>    Or if anyone's got any alternative ideas I'd be happy to hear them.
> Of course, the best solution would be to have open source PV drivers for
> Windows, but I don't think that's even on the horizon.
>
> Thanks in advance for any input.
>
>
> Martin
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>
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--
George Lenzer
Computer and Networking Specialist
Cleveland Public Library
Automation Department
Office: (216)623-2981


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