linux-kernel - Re: linux-next: manual merge of the kvm-ppc tree with the powerpc-merge tree

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Date:	Thu, 11 Oct 2012 12:28:56 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Timur Tabi <B04825@...escale.com>
CC:	Alexander Graf <agraf@...e.de>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: linux-next: manual merge of the kvm-ppc tree with the
 powerpc-merge tree

On 10/11/2012 12:24:59 PM, Timur Tabi wrote:
> Scott Wood wrote:
> >> > My concern is that when I think of a user-space header file, I  
> think
> >> > of a
> >> > user-space application that calls ioctls.  I know that KVM guest
> >> > kernels
> >> > run as user-space processes, but that does not seem like a  
> reason to
> >> > combine all of the header files that the KVM guest kernel needs  
> with
> >> > "real" user-space header files.
> 
> > So where should guest headers go?
> 
> I admit that I don't have any answers, especially since this whole  
> thing
> is new to me.  Like I said, I don't know much about KVM internals, so  
> I
> just don't understand why KVM guests need to have access to these  
> kernel
> header files as if they're user header files.  The guests are still  
> Linux
> kernels (or other OSes that think they're running as privileged code).

For hypercalls and other paravirt.  That's the point -- they're not  
kernel headers.  They're guest API headers.

-scott
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