Re: [Xen-devel] [PATCH] xen/p2m: Export set_phys_to_machine.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Sep 06, 2013 at 03:06:02PM +0100, Jan Beulich wrote:
> >>> On 06.09.13 at 16:00, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
> >>> wrote:
> > We have already exported 'get_phys_to_machine' and there are
> > third-party drivers that depend on this other symbol. As such
> > lets make this balanced and also export this symbol.
> 
> I tend to disagree: Allowing external modules read access to some
> internal state is quite different from also allowing them to alter it.

I am not following you. We have drivers in the kernel that do
this now. For example xen-netfront uses set_phys_to_machine.

Oddly it can be built as a module.  I am wondering how it actually
works without this EXPORT symbol.

> 
> Jan
> 
> > Reported-by: Yuval Shaia <yuval.shaia@xxxxxxxxxx>
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > ---
> >  arch/x86/xen/p2m.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
> > index 0d4ec35..cdb96bc 100644
> > --- a/arch/x86/xen/p2m.c
> > +++ b/arch/x86/xen/p2m.c
> > @@ -847,6 +847,7 @@ bool set_phys_to_machine(unsigned long pfn, unsigned 
> > long mfn)
> >  
> >     return true;
> >  }
> > +EXPORT_SYMBOL_GPL(set_phys_to_machine);
> >  
> >  #define M2P_OVERRIDE_HASH_SHIFT    10
> >  #define M2P_OVERRIDE_HASH  (1 << M2P_OVERRIDE_HASH_SHIFT)
> > -- 
> > 1.8.3.1
> > 
> > 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx 
> > http://lists.xen.org/xen-devel 
> 
> 
> 

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