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Re: [Xen-devel][RFC] Dynamic modes support for PV xenfb (included)

To: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Subject: Re: [Xen-devel][RFC] Dynamic modes support for PV xenfb (included)
From: Markus Armbruster <armbru@xxxxxxxxxx>
Date: Thu, 31 Jan 2008 09:50:00 +0100
Cc: Derek Murray <Derek.Murray@xxxxxxxxxxxx>, "Daniel P. Berrange" <berrange@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Pat Campbell <plc@xxxxxxxxxx>
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Gerd Hoffmann <kraxel@xxxxxxxxxx> writes:

> Pat Campbell wrote:
>> Markus Armbruster wrote:
>>> I can't see how using grants for the page directory is an improvement
>>> over your previous iteration, which used pd[].  Can you explain?
>>>   
>> I will try, I am not the greatest communicator lately. 
>
> The real question is why stop half-way with the grant tables conversion?
[...]

Precisely.

Since we need to stay backward compatible, stable interfaces tend to
remain with us basically forever.  Maintaining the current mfn-based
interface plus a future interface fully based on grants seems okay to
me.  But please no intermediate steps.

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