Re: [Xen-devel] [PATCH v3 07/13] xen/arm: Simplify alternative patching of non-writable region

[Julien Grall <julien.grall@xxxxxxx>]

Hi Konrad,

On 22/06/18 14:33, Konrad Rzeszutek Wilk wrote:
> On Tue, Jun 12, 2018 at 11:06:16PM +0100, Julien Grall wrote:
> > On 12/06/2018 22:17, Konrad Rzeszutek Wilk wrote:
> > > On Tue, Jun 12, 2018 at 12:36:37PM +0100, Julien Grall wrote:
> > > Won't this mean the traps (if there are any) won't be recognized at all
> > > during this patching?
> > What do you mean by recognized? This new region will only be accessed to
> > write instruction. The only potential fault on that region is a data abort.
> Exactly the data abort.
>
> My recollection is that the data abort would print a stack trace. And
> the stack trace needs symbol information - which it gets from virtual_region.
>
> But if virtual_region is not registered then the stack won't contain the
> name of the function that had an data abort as the patching is done.
I am not sure to understand what you mean by "the name of the function 
that had a data abort". Could you give a bit more detail?
Cheers,

--
Julien Grall

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