Re: [PATCH v7 4/6] mm: introduce a helper to get the memory type of a page

[Wei Liu <wei.liu2@citrix.com>]

On Wed, Aug 22, 2018 at 09:51:58AM +0200, Roger Pau Monne wrote:
> Returns all the memory types applicable to a page.
> 
> This function is unimplemented for ARM.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
> Reviewed-by: Jan Beulich <jbeulich@suse.com>
> ---
> Changes since v5:
>  - Return all types that apply to a page, since the types themselves
>    are flags that can be or'ed together.
> ---
> Cc: Stefano Stabellini <sstabellini@kernel.org>
> Cc: Julien Grall <julien.grall@arm.com>
> Cc: Andrew Cooper <andrew.cooper3@citrix.com>
> Cc: George Dunlap <George.Dunlap@eu.citrix.com>
> Cc: Ian Jackson <ian.jackson@eu.citrix.com>
> Cc: Jan Beulich <jbeulich@suse.com>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Tim Deegan <tim@xen.org>
> Cc: Wei Liu <wei.liu2@citrix.com>
> ---
>  xen/arch/x86/mm.c    | 42 ++++++++++++++++++++++++++++++++++++++++++
>  xen/include/xen/mm.h |  3 +++
>  2 files changed, 45 insertions(+)
> 
> diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
> index 8ac4412554..fcf4bb0afc 100644
> --- a/xen/arch/x86/mm.c
> +++ b/xen/arch/x86/mm.c
> @@ -430,6 +430,48 @@ int page_is_ram_type(unsigned long mfn, unsigned long mem_type)
>      return 0;
>  }
>  
> +unsigned int page_get_ram_type(unsigned long mfn)

It would be better if you can use type-safe mfn_t here.


> +{
> +    uint64_t last = 0, maddr = pfn_to_paddr(mfn);

And then

    maddr = mfn_to_maddr(mfn);

The rest looks good to me.

Wei.

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