Hi Jan,
> -----Original Message-----
> From: Jan Beulich <jbeul...@suse.com>
> Sent: 2022年1月25日 0:25
> To: Wei Chen <wei.c...@arm.com>
> Cc: Bertrand Marquis <bertrand.marq...@arm.com>; xen-
> de...@lists.xenproject.org; sstabell...@kernel.org; jul...@xen.org
> Subject: Re: [PATCH 09/37] xen/x86: introduce two helpers to access memory
> hotplug end
>
> On 23.09.2021 14:02, Wei Chen wrote:
> > x86 provides a mem_hotplug to maintain the end of memory hotplug
> > end address. This variable can be accessed out of mm.c. We want
> > some code out of mm.c can be reused by other architectures without
> > memory hotplug ability. So in this patch, we introduce these two
> > helpers to replace mem_hotplug direct access. This will give the
> > ability to stub these two API.
> >
> > Signed-off-by: Wei Chen <wei.c...@arm.com>
> > ---
> > xen/include/asm-x86/mm.h | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
> > index cb90527499..af2fc4b0cd 100644
> > --- a/xen/include/asm-x86/mm.h
> > +++ b/xen/include/asm-x86/mm.h
> > @@ -475,6 +475,16 @@ static inline int get_page_and_type(struct
> page_info *page,
> >
> > extern paddr_t mem_hotplug;
> >
> > +static inline void mem_hotplug_update_boundary(paddr_t end)
> > +{
> > + mem_hotplug = end;
> > +}
> > +
> > +static inline paddr_t mem_hotplug_boundary(void)
> > +{
> > + return mem_hotplug;
> > +}
> > +
> >
> /*************************************************************************
> *****
> > * With shadow pagetables, the different kinds of address start
> > * to get get confusing.
>
> Imo for this to make sense you want to also use the new functions
> right away in the place(s) where the direct access(es) get(s) in
> your way.
>
OK, I will merge this patch with the patch that will use these
functions firstly.
> Jan
