[U-Boot] [PATCH v3 2/3] efi_loader: ARM: run EFI payloads non-secure

[Mark Kettenis]

> From: Heinrich Schuchardt <xypron.glpk at gmx.de>
> Date: Fri, 31 Aug 2018 19:37:25 +0200
> 
> On 06/14/2018 12:41 AM, Mark Kettenis wrote:
> > If desired (and possible) switch into HYP mode or non-secure SVC mode
> > before calling the entry point of an EFI application.  This allows
> > U-Boot to provide a usable PSCI implementation and makes it possible
> > to boot kernels into hypervisor mode using an EFI bootloader.
> > 
> > Based on diffs from Heinrich Schuchardt and Alexander Graf.
> > 
> > Signed-off-by: Mark Kettenis <kettenis at openbsd.org>
> 
> bootefi hello fails on vexpress_ca15_tc2_defconfig when run on qemu with
> 
>         QEMU_AUDIO_DRV=none qemu-system-arm \
>         -M vexpress-a15 -cpu cortex-a15 -kernel u-boot \
>         -net user -net nic,model=lan9118 \
>         -m 1024M --nographic \
>         -drive if=sd,file=img.vexpress,media=disk,format=raw

Works for me with:

$ qemu-system-arm --version
QEMU emulator version 3.0.0
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

=> bootefi hello
Scanning disks on mmc...
MMC Device 1 not found
MMC Device 2 not found
MMC Device 3 not found
Found 3 disks
WARNING: booting without device tree
## Starting EFI application at a0008000 ...
WARNING: using memory device/image path, this may confuse some payloads!
Hello, world!
Running on UEFI 2.7
Have SMBIOS table
Load options: <none>
## Application terminated, r = 0

That is with CONFIG_CMD_BOOTEFI_HELLO=y added to the
vexpress_ca15_tc2_defconfig of course.

> Bisection points to
> efi_loader: ARM: run EFI payloads non-secure
> commit dc500c369486fbe04000fd325c46bb309e4a1827

That suggests an issue with emulation if the mode switching
instructions or HYP support in qemu.  Or a toolchain issue of course.

Cheers,

Mark