linux-kernel - Re: [kvm-devel] [RFC] Stable kvm userspace interface

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Message-ID: <20070112111927.GB7145@ucw.cz>
Date:	Fri, 12 Jan 2007 11:19:27 +0000
From:	Pavel Machek <pavel@....cz>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Arnd Bergmann <arnd@...db.de>, kvm-devel@...ts.sourceforge.net,
	Avi Kivity <avi@...ranet.com>, Andrew Morton <akpm@...l.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [kvm-devel] [RFC] Stable kvm userspace interface


Hi!

> >>Can we please avoid adding a ton of new ioctls?  
> >>ioctls inevitably require 64-bit compat code for 
> >>certain architectures, whereas sysfs/procfs does not.
> >
> >For performance reasons, an ascii string based 
> >interface is not
> >desireable here, some of these calls should be 
> >optimized to
> >the point of counting cycles.
> 
> sysfs does not require ASCII...

Yep, but at that point you have 32 vs. 64bit nightmare back... and
stronger, because sysfs does not have compat handling.

-- 
Thanks for all the (sleeping) penguins.
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