Re: [Xen-devel] [PATCH 11/14] xen/x86: mm: Re-implement set_gpfn_from_mfn() as a static inline function

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 10.05.19 at 16:05, <julien.grall@xxxxxxx> wrote:
> On 10/05/2019 14:48, Jan Beulich wrote:
>>>>> On 10.05.19 at 15:41, <julien.grall@xxxxxxx> wrote:
>>> On 10/05/2019 14:35, Jan Beulich wrote:
>>>> I didn't mean it to remain NULL. Common code doesn't dereference it
>>>> (and isn't supposed to), so I'd consider initializing it to some known
>>>> faulting non-NULL address, if there is such on Arm.
>>>
>>> Patches are welcomed ;).
>> 
>> So is there such an address on Arm?
> 
> 0 - 2MB is unmapped so far. I don't know whether this will still be the case 
> (at 
> least for the range 4KB - 2MB) with the rework I am attempting.

Hmm, I was hoping for an architecturally faulting address, like
the non-canonical ones we have on x86-64.

Jan



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