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Message-ID: <20061130201935.GA14696@elte.hu>
Date: Thu, 30 Nov 2006 21:19:35 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Andrew Morton <akpm@...l.org>
Cc: Christoph Hellwig <hch@...radead.org>,
Avi Kivity <avi@...ranet.com>, kvm-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/38] KVM: Create kvm-intel.ko module
* Andrew Morton <akpm@...l.org> wrote:
> It's a fat, complex, presumably arch-specific, presumably
> frequently-changing API. So whatever we do will be unpleasant -
> that's unavoidable in this case, I suspect.
>
> (hmm, the interface isn't versioned at present - should it be?)
>
> Maybe, perhaps, one day it _should_ be a syscall API. But right now
> if we did that it would become a versioned syscall API with obsolete
> slots and various other warts.
yeah, very much agreed. For example the paravirtualization/accelerator
downcalls/upcalls in KVM dont exist yet, so there's little to
standardize. Once we see it from lhype & KVM how these things look like
we can design a sane kernel interface around it. But i'm against the
notion that KVM is 'just' a device. It's not, and it /will/ grow into
something fundamental.
> I get the feeling we'd be best off if we were to revisit this in a
> year or so.
yeah. I'd suggest merging it as-is into v2.6.20. In a year we'll have
some real APIs to think about.
Ingo
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