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

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 10/05/2019 15:21, Jan Beulich wrote:
> > > > 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.
Nothing we can reliably use across Armv7 and Armv8 (and future extension).

Cheers,

--
Julien Grall

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