Re: [Xen-devel] Problems building and running Xen on Hikey960

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 28/11/2018 15:46, Stefano Stabellini wrote:
> On Wed, 28 Nov 2018, Julien Grall wrote:
> > Hi Matthew,
> >
> > On 28/11/2018 06:43, Matthew Daley wrote:
> > > On Mon, 26 Nov 2018 at 14:07, Matthew Daley <mattd@xxxxxxxxxxx> wrote:
> > > > On Fri, 23 Nov 2018 at 09:51, Julien Grall <julien.grall@xxxxxxx> wrote:
> > > > > Hi Matthew,
> > > > >
> > > > > Sorry for the late answer and thank you for testing the patch.
> > > > >
> > > > > On 11/13/18 10:43 PM, Matthew Daley wrote:
> > > > > > On Tue, 13 Nov 2018 at 02:01, Julien Grall <julien.grall@xxxxxxx> wrote:
> > > > > > > On 11/11/18 1:15 AM, Matthew Daley wrote:
> > > > > > I gave this a go but unfortunately the same problem occurs (error
> > > > > > -9s). Just to check nothing weird is happening I added a printk to
> > > > > > check the value of __pa(init_secondary) in call_psci_cpu_on, giving
> > > > > > 0xdfe00180.
> > > > > I have posted a patch that disables completely the relocation [1]. Could
> > > > > you have a try and see whether it works now?
> > > > >
> > > > > Cheers,
> > > > >
> > > > > [1] https://lists.xen.org/archives/html/xen-devel/2018-11/msg02638.html
> > > > >
> > > > > --
> > > > > Julien Grall
> > > >
> > > > Hi Julien,
> > > >
> > > > Unfortunately with this patch it appears to freeze after the call to 
> > > > switch_ttbr(ttbr).
> > > >
> > > > - Matthew
> > > So looking at setup_pagetables, my understanding is that it sets up a
> > > 2MiB mapping for Xen's .text section (before then splitting it into
> > > 4KiB pages). However, GRUB is loading Xen in RAM at 0xB8736000 for me.
> > > This isn't 2MiB aligned (and isn't in low memory either!), so I can't
> > > see how this would work; it still requires relocation or a more
> > > granular mapping, no?
> > I missed the fact that we configure the PE/COFF header with 4KB alignment.
> > Therefore UEFI is free to load Xen at any address 4KB aligned.
> >
> > I managed to reproduce it on some UEFI platform and came up with
> > the following patch:
> well done!
Hmmm, it looks like some versions of GRUB are not happy with this patch. I am 
not entirely sure why.
Anyway, I have a patch to use a smaller granule that should also fix another bug 
at the same time. I send them tonight.
Cheers,

--
Julien Grall

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