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 10:50:03 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Alexander Graf <agraf@...e.de>
CC:	Tabi Timur-B04825 <B04825@...escale.com>,
	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 08:04:58 AM, Alexander Graf wrote:
> 
> On 11.10.2012, at 05:32, Tabi Timur-B04825 wrote:
> 
> > On Wed, Oct 10, 2012 at 9:47 PM, Stephen Rothwell  
> <sfr@...b.auug.org.au> wrote:
> >
> >> Commit 549d62d889b4 ("KVM: PPC: use definitions in epapr header
> >> for hcalls") from the kvm-ppc tree added an include of  
> asm/epapr_hcall.h
> >> to the user visible part of asm/kvm_para.h so asm/epapr_hcall.h  
> became a
> >> user visible header file.
> >
> > Any real user-space code that tries to call any of the functions in
> > epapr_hcall.h will cause an exception.

Actually it'll cause a linker error, as of the "Don't use hardcoded  
opcode for ePAPR hcall invocation" patch.

> > Claiming that kernel header files that KVM needs are suddenly
> > user-space header files doesn't make much sense to me, but I guess
> > it's not my decision.
> 
> This is about kvm_host.h, which is the part that is exported to user  
> space. It usually contains constants and structs that are required  
> for the API.

s/kvm_host/kvm_para/

I'm not sure anything in kvm_para.h or epapr_hcalls.h would be of use  
to userspace, but it would be of use to the guest OS, so it's still not  
kernel-internal.

The variable externs should be #ifdef __KERNEL__ as David points out.   
The asm stuff could still be useful in a guest OS if the guest provides  
epapr_hypercall_start.

-Scott
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