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[Xen-devel] Re: [Xen-users] Xen 4.1 Feature Request List

To: Grant McWilliams <grantmasterflash@xxxxxxxxx>
Subject: [Xen-devel] Re: [Xen-users] Xen 4.1 Feature Request List
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Wed, 7 Apr 2010 17:51:53 +0300
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stephen Spector <stephen.spector@xxxxxxxxxx>, Xen List <xen-users@xxxxxxxxxxxxxxxxxxx>
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On Wed, Apr 07, 2010 at 04:13:07AM -0700, Grant McWilliams wrote:
>    These might not be wishes for 4.1 as some may be too big but they're my
>    wishlist anyway. Note they also might not be things that belong to the
>    Hypervisor but rather to tools associated with.
>     1. Make qcow2 actually work and include backing files.

Have you checked out blktap2 VHD support? Does it work for you? 

See: http://wiki.xensource.com/xenwiki/XenCommonProblems
for links.

>          1. If it can't be made to work then it should be taken out and not
>             mentioned in the docs so we don't waste weeks trying to get it to
>             work.

>From which docs?

>     2. Figure out why you can't start a VM with a disk image residing in a
>        ramdisk (bug?)

I have never tried this one. Which disk backend did you use? 

>     3. Nesting
>          1. As silly as this feature sounds it may be why I leave Xen for
>             KVM. This would be useful for teaching management of VMs. A
>             student could have a Dom0 and start up DomUs inside it without
>             each on needing their own physical machine.

There was a presentation about Xen 'nested' virtualization at Xen Summit 2009:

Youtube also has some videos about the presentation.

>     4. Install PV DomU from CD without FTP/NFS tricks.
>          1. I don't care how it's done but it would be nice. The "install
>             from network" shuffle can pose a complexity for people getting
>             started in Xen. I'm aware that HVM does this because of it's use
>             of Qemu but it would be nice everywhere. Maybe as Xen moves to
>             Hybrid VMs instead of PV/HVM this will no longer be an issue.

There has been work for hybrid HVM+PV Xen guests recently by Intel and Citrix.

The problem of booting PV domU installers from a CD/.iso is the fact
that the CD needs to have a Xen PV kernel included! Many images don't have that.

This is changing now when distros ship kernels with pvops Xen domU support 
it has been in the mainline Linux for a couple of years now.

>    I'm sure I'll think of others but that's off the top of my head. Like I
>    said maybe some of it would be Xen 5 stuff, I don't know.

-- Pasi

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