Re: [Xen-devel] [PATCH v2 01/20] xen: Add Xen specific page definition

[Julien Grall]

Hi David,

On 24/07/15 10:28, David Vrabel wrote:
> On 09/07/15 21:42, Julien Grall wrote:
>> The Xen hypercall interface is always using 4K page granularity on ARM
>> and x86 architecture.
>>
>> With the incoming support of 64K page granularity for ARM64 guest, it
>> won't be possible to re-use the Linux page definition in Xen drivers.
>>
>> Introduce Xen page definition helpers based on the Linux page
>> definition. They have exactly the same name but prefixed with
>> XEN_/xen_ prefix.
>>
>> Also modify page_to_pfn to use new Xen page definition.
>>
>> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
>> Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
>> Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
>> Cc: David Vrabel <david.vrabel@xxxxxxxxxx>
>> ---
>>     I'm wondering if we should drop page_to_pfn has the macro will likely
>>     misuse when Linux is using 64KB page granularity.
> 
> I think we want xen_gfn_to_page() and xen_page_to_gfn() and Xen
> front/back drivers never deal with PFNs only GFNs.

What is xen_gfn_to_page and xen_page_to_gfn? Neither Linux, nor my
series have them.

Regards,

-- 
Julien Grall
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