[RFC PATCH 0/5] Exception handling in HYP mode on ARMv7-A

[Tom Rini]

On Sun, Oct 24, 2021 at 07:58:03PM -0400, Jim Posen wrote:

> Currently, when U-Boot is running in hypervisor mode on ARMv7-A CPUs
> with virtualization extensions, the exception handling does not work.
> A couple things need to change which are detailed in my earlier
> message to the u-boot mailing list with the subject "Exception
> handling in HYP mode on ARMv7-A".
> 
> I have verified that this patch series works on the ODroid XU4 and
> the Raspberry Pi 3B in Aarch32 mode when running in hypervisor mode.
> One simple way to verify is by running the miscellaneous "exception"
> command (CMD_EXCEPTION).
> 
> 
> Jim Posen (5):
>   Compile for ARMv7-A with virtualization extensions
>   Hypervisor mode interrupt vector table
>   Set HVBAR register correctly
>   Remove dead code
>   Fix PC adjustment logic in exception handlers
> 
>  arch/arm/Makefile                 |   4 +
>  arch/arm/cpu/armv7/start.S        |   5 ++
>  arch/arm/include/asm/u-boot-arm.h |  14 ++--
>  arch/arm/lib/interrupts.c         |  26 +++---
>  arch/arm/lib/relocate.S           |   8 ++
>  arch/arm/lib/vectors.S            | 129 +++++++++++++++++++++++-------
>  arch/arm/mach-bcm283x/Kconfig     |   3 +
>  arch/arm/mach-exynos/Kconfig      |   1 +
>  8 files changed, 139 insertions(+), 51 deletions(-)

This all seems fine, but I don't know enough about the specifics here to
comment on the implementation.  Is there any we we could also test this
via QEMU for example?

-- 
Tom
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