Re: [Xen-devel] [PATCH v2] boot allocator: Use arch helper for virt_to_mfn on DIRECTMAP

[Julien Grall <julien.grall@xxxxxxx>]

Hello Vijay,

On 13/03/17 11:43, vijay.kilari@xxxxxxxxx wrote:
> From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxx>
>
> On ARM, virt_to_mfn uses the hardware for address
> translation. So if the virtual address is not mapped translation
> fault is raised.On ARM, DIRECTMAP_VIRT region is direct mapped.
This is not true. As I said before, all the memory will be direct mapped 
on ARM64 but not on ARM32.
For ARM32, only xenheap will be direct mapped. So you may want to return 
is_xenheap_mfn(...). Or even return false in all the case. Either is 
fine by me, but it would need to be explained in the code.
Regards,

--
Julien Grall

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