Re: [RFC] Unify KVM kernel-space and user-space code into a single project

Antoine Martin
2010-03-21T20:18:26Z

On 03/22/2010 03:11 AM, Avi Kivity wrote:
> On 03/21/2010 10:08 PM, Olivier Galibert wrote:
>> On Sun, Mar 21, 2010 at 10:01:51PM +0200, Avi Kivity wrote:
>>> On 03/21/2010 09:17 PM, Ingo Molnar wrote:
>>>> Adding any new daemon to an existing guest is a deployment and
>>>> usability
>>>> nightmare.
>>>>
>>> The logical conclusion of that is that everything should be built into
>>> the kernel. Where a failure brings the system down or worse. Where
>>> you
>>> have to bear the memory footprint whether you ever use the
>>> functionality
>>> or not. Where to update the functionality you need to deploy a new
>>> kernel (possibly introducing unrelated bugs) and reboot.
>>>
>>> If userspace daemons are such a deployment and usability nightmare,
>>> maybe we should fix that instead.
>> Which userspace? Deploying *anything* in the guest can be a
>> nightmare, including paravirt drivers if you don't have a natively
>> supported in the OS virtual hardware backoff.
>
> That includes the guest kernel. If you can deploy a new kernel in the
> guest, presumably you can deploy a userspace package.
That's not always true.
The host admin can control the guest kernel via "kvm -kernel" easily
enough, but he may or may not have access to the disk that is used in
the guest. (think encrypted disks, service agreements, etc)

Antoine
>> Deploying things in the
>> host OTOH is business as usual.
>
> True.
>
>> And you're smart enough to know that.
>
> Thanks.
>