Re: [Xen-devel] [PATCH RFC for-4.13 03/10] xen/arm: traps: Rework entry/exit from the guest path

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 03/10/2019 18:48, Stefano Stabellini wrote:
> On Thu, 3 Oct 2019, Julien Grall wrote:
> > Hi Stefano,
> >
> > On 02/10/2019 23:26, Stefano Stabellini wrote:
> > > On Wed, 2 Oct 2019, Julien Grall wrote:
> > > That was my reflection on whether it would be a good idea or a bad idea
> > > to have a SERROR check on the fiq hypervisor entries. Not necessarely in
> > > this patch. Probably not in this patch.
> > If you receive a FIQ exception on Arm64, then you are already doomed because
> > the hypervisor will crash (see do_bad_mode()). So receiving the SError is
> > going to be your last concern here.
> I realize that Xen is doomed anyway, but if I was the user, I would
> still want to know about the SError: it is not going to save the
> platform in any way but it might make me realize there is something
> wrong with the guest configuration (in addition to the FIQ problem.)
This is not something I am going to look at in the near future. There are more 
concerning problem in arch/arm*/entry.S. Although, patches are welcomed.
Cheers,

--
Julien Grall

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