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

[Jim Posen]

I sent a new version of the patch series with a couple of fixes and


instructions for testing with QEMU.

On Tue, Nov 23, 2021 at 10:24 AM Tom Rini <trini at konsulko.com> wrote:

> 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
>