Re: [PATCH 1/10] Trivial: /dev/kvm interface is no longer experimental.

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Rusty Russell wrote:
> On Tue, 2007-07-17 at 18:35 +0200, Arnd Bergmann wrote:
>   
>> On Tuesday 17 July 2007, Rusty Russell wrote:
>>     
>>> KVM interface is no longer experimental.
>>>
>>> Signed-off-by: Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
>>>
>>> diff -r 4e57f5c6d4a9 include/linux/kvm.h
>>> --- a/include/linux/kvm.h       Tue Jul 17 13:04:58 2007 +1000
>>> +++ b/include/linux/kvm.h       Tue Jul 17 13:09:54 2007 +1000
>>> @@ -4,8 +4,7 @@
>>>  /*
>>>   * Userspace interface for /dev/kvm - kernel based virtual machine
>>>   *
>>> - * Note: this interface is considered experimental and may change without
>>> - *       notice.
>>> + * Note: you must update KVM_API_VERSION if you change this interface.
>>>   */
>>>       
>> I don't like the idea of making this interface official. If this is the
>> point where we think it's perfect, it should become a set of real system
>> calls instead.
>>     
>
> I don't either, but I thought Avi had announced interface stability.
> That doesn't preclude a new API, but it does mean that the old one must
> be supported...
>   

This interface is official as there is userspace deployed that uses it
that we are committed not to break.

In case we do switch to a syscall based interface, this is a positive
thing:  it allows us to make the syscall interface unofficial as long as
we like, and when we are finally satisfied we can deprecate the old
interface.



-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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