Re: [Xen-devel] [PATCH for-next 9/9] xen: Remove mfn_to_gmfn macro

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 13/03/2019 15:40, Jan Beulich wrote:
> > > > On 13.03.19 at 16:24, <julien.grall@xxxxxxx> wrote:
> > On 13/03/2019 15:22, Jan Beulich wrote:
> > > > > > On 18.02.19 at 12:36, <julien.grall@xxxxxxx> wrote:
> > > > --- a/xen/include/asm-arm/mm.h
> > > > +++ b/xen/include/asm-arm/mm.h
> > > > @@ -321,10 +321,8 @@ struct page_info *get_page_from_gva(struct vcpu *v, 
> > > > vaddr_t va,
> > > >    #define SHARED_M2P_ENTRY         (~0UL - 1UL)
> > > >    #define SHARED_M2P(_e)           ((_e) == SHARED_M2P_ENTRY)
> > > >    
> > > > -/* Xen always owns P2M on ARM */
> > > > +/* We don't have a M2P on Arm */
> > > >    #define set_gpfn_from_mfn(mfn, pfn) do { (void) (mfn), (void)(pfn); } while 
> > > > (0)
> > > > -#define mfn_to_gmfn(_d, mfn)  (mfn)
> > > So is the plan to remove the other macro from Arm then as well?
> > Do you mean mfn_to_gfn? If so it does not exist on Arm.
> No, I mean the one in context above - set_gpfn_from_mfn().
It is used in common code, so we would need to #idef the caller.

I think it is better to provide a NOP implementation. Could be moved somewhere 
in the common header though. Any opinions?
Cheers,

--
Julien Grall

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