Re: [PATCH 0/4] xen/arm: Unbreak ACPI

[Elliott Mitchell <ehem+xen@xxxxxxx>]

On Fri, Oct 09, 2020 at 10:39:26AM +0100, Julien Grall wrote:
> On 08/10/2020 19:39, Elliott Mitchell wrote:
> > Your (Masami Hiramatsu) patch seems plausible, but things haven't
> > progressed enough for me to endorse it.  Looks like something closer to
> > the core of ACPI still needs further work, Julien Grall?
> 
> I didn't go very far during my testing because QEMU is providing ACPI 
> 5.1 (Xen only supports 6.0+ so far).
> 
> For your log above, Xen finished to boot and now dom0 should start 
> booting. The lack of console output may be because of a crash in Linux 
> during earlyboot.
> 
> Do you have the early console enabled Linux? This can be done by adding 
> earlycon=xenboot on the Linux command line.

Finding all the command-line console settings can be a challenge.  I had
thought it was supposed to be "console=hvc0 earlycon=hvc0".

With that though I finally have some output which claims to come from the
Linux kernel (yay! finally hit this point!).  As we were both guessing,
very early kernel panic:

[    0.000000] efi: Getting EFI parameters from FDT:
[    0.000000] efi: Can't find 'System Table' in device tree!
[    0.000000] cma: Failed to reserve 64 MiB
[    0.000000] Kernel panic - not syncing: Failed to allocate page table page

I don't know whether this is a problem with the mini-DT which was passed
in versus ACPI tables.  I note a complete lack of ACPI table information.
The kernel is from a 5.6-based kernel tree.  I'm unsure which portion to
try updating next.


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