Re: [PATCH 09/37] xen/x86: introduce two helpers to access memory hotplug end

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

+x86 maintainers

On Thu, 23 Sep 2021, Wei Chen wrote:
> x86 provides a mem_hotplug to maintain the end of memory hotplug
                            ^ variable

> 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
                       ^ so that it can be reused

> 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.
                            ^ APIs


> Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
> ---
>  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.
> -- 
> 2.25.1
>