linux-kernel - Re: [PATCH 2.6.25] module: allow ndiswrapper to use GPL-only symbols

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Date:	Wed, 5 Mar 2008 00:25:58 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Roskin <proski@....org>, Zan Lynx <zlynx@....org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jon Masters <jcm@...masters.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH 2.6.25] module: allow ndiswrapper to use GPL-only symbols

On Tue, 4 Mar 2008, Ingo Molnar wrote:

> > Ingo, i's simply not possible to put ndiswrapper in user-space sanely.
> > Drivers are drivers. They'll want (shared) interrupts, they want DMA, 
> > they want to do things like cli/sti.
> yeah, i agree that putting it into userspace is quite insane.
> it might possible to do it halfways sanely via existing arch/x86/kvm/ 
> infrastructure though. VMX/SVM context will properly emulate the IRQ 
> flag so cli/sti will work fine, and as long as DMA is properly 
> quarantined via an iommu it might even not corrupt the rest of the 
> system. 

This definitely could be a [hackish] way to go. The remarkable drawback 
is that it will not work on CPUs without virtualization extensions.

-- 
Jiri Kosina
SUSE Labs

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