Re: [Xen-devel] RT Xen on ARM - R-Car series

[Julien Grall <julien.grall@xxxxxxx>]

On 31/01/2019 11:22, Andrii Anisov wrote:
> Julien,
>
> On 30.01.19 14:12, Julien Grall wrote:
> > Hi,
> >
> > On 30/01/2019 20:23, LOPEZ, FUENTES NACARINO Jairo Eduardo wrote:
> >
> > My e-mail client thinks the e-mail was sent from the future. Can you make sure 
> > your timezone is set correctly?
> > > [    0.682996] CPU features: detected feature: Kernel page table isolation 
> > > (KPTI)
> > > (XEN) p2m.c:1844: d0v1: Failed to walk page-table va 0xffff800013f59c57
> > > (XEN) p2m.c:1844: d0v2: Failed to walk page-table va 0xffff800013f70c57
> > > (XEN) p2m.c:1844: d0v1: Failed to walk page-table va 0xffff800013f59c48
> > > (XEN) p2m.c:1844: d0v2: Failed to walk page-table va 0xffff800013f70c48
> > >
> > > </ this continues infinitely>
> > >
> > > Is this normal. Could the error have anything to do with me using the 
> > > dom0_max_vpcus=4 bootarg for Xen?
> > No this is a unknown 
> I'm sure you did mean "a known".
>
> > benign issue when using KPTI kernel on Xen (see [1]). I still haven't found 
> > time to fix it and would appreciate help to solve the issue.
> I've looked through the thread, and it seems it is not even decided how should 
> it be fixed. Should it be a new interface, of fix would fit the existing, and 
> the thread died pretty long ago.
Well, someone needs to drive the discussion and write the patch. This is in my 
long ever growing list of things to improve in Xen. But...
> On my side I just commented out that printk, because it renders a debug build 
> unusable.
... if it is unusable, why don't you try to tackle the problem? This is a good 
way to understand better the intrinsics of Xen. I will be more than happy to 
provide guidance and review the patches.
Cheers,

--
Julien Grall

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