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

[Julien Grall <julien@xxxxxxx>]

Hi Alex,

On 29/09/2020 16:29, Alex Bennée wrote:
> Julien Grall <julien@xxxxxxx> writes:
>
> > From: Julien Grall <jgrall@xxxxxxxxxx>
> >
> > Hi all,
> >
> > Xen on ARM has been broken for quite a while on ACPI systems. This
> > series aims to fix it.
> >
> > Unfortunately I don't have a system with ACPI v6.0 or later (QEMU seems
> > to only support 5.1). So I did only some light testing.
> I was hoping to get more diagnostics out to get it working under QEMU
> TCG so I think must of missed a step:
>
>    Loading Xen 4.15-unstable ...
>    Loading Linux 4.19.0-11-arm64 ...
>    Loading initial ramdisk ...
>    Using modules provided by bootloader in FDT
>    Xen 4.15-unstable (c/s Sat Sep 26 21:55:42 2020 +0100 git:72f3d495d0) EFI 
> loader
>    ...silence...
>
> I have a grub installed from testing on a buster base:
>
>    dpkg --status grub-arm64-efi
>    Version: 2.04-8
>
> With:
>
>    GRUB_CMDLINE_LINUX_DEFAULT=""
>    GRUB_CMDLINE_LINUX="console=ttyAMA0"
>    GRUB_CMDLINE_LINUX_XEN_REPLACE="console=hvc0 earlyprintk=xen"
>    GRUB_CMDLINE_XEN="loglvl=all guest_loglvl=all 
> com1=115200,8n1,0x3e8,5console=com1,vg"
>
> And I built Xen with --enable-systemd and tweaked the hypervisor .config:
>
>    CONFIG_EXPERT=y
>    CONFIG_ACPI=y
>
> So any pointers to make it more verbose would be helpful.
The error is hapenning before Xen setup the console. You can get early 
output on QEMU if you rebuild Xen with the following .config options:
CONFIG_DEBUG=y
CONFIG_EARLY_UART_CHOICE_PL011=y
CONFIG_EARLY_UART_PL011=y
CONFIG_EARLY_PRINTK=y
CONFIG_EARLY_UART_BASE_ADDRESS=0x09000000
CONFIG_EARLY_UART_PL011_BAUD_RATE=0
CONFIG_EARLY_PRINTK_INC="debug-pl011.inc"

Cheers,

--
Julien Grall