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

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Date:	Wed, 5 Mar 2008 14:21:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jiri Kosina <jkosina@...e.cz>
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


* Jiri Kosina <jkosina@...e.cz> wrote:

> 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.

by the time it's implemented and trickles into distributions the 
majority of PCs will have virtualization extensions.

	Ingo
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