RE: [boot-wrapper PATCH v3 0/8] Add Armv8-R AArch64 support

[Jaxson Han <Jaxson.Han@arm.com>]

Hi Mark and Andre,
I hope you are doing well. :)
May I ask about the situation of these patches and what else I can do to
improve them if needed?

Cheers,
Jaxson

> -----Original Message-----
> From: Andre Przywara <andre.przywara@arm.com>
> Sent: Thursday, June 17, 2021 7:58 PM
> To: Mark Rutland <Mark.Rutland@arm.com>
> Cc: Jaxson Han <Jaxson.Han@arm.com>; linux-arm-
> kernel@lists.infradead.org; Wei Chen <Wei.Chen@arm.com>
> Subject: Re: [boot-wrapper PATCH v3 0/8] Add Armv8-R AArch64 support
> 
> On Tue, 25 May 2021 14:25:01 +0800
> Jaxson Han <jaxson.han@arm.com> wrote:
> 
> Hi Mark,
> 
> > Currently, we cannot boot Linux with boot-wrapper on Armv8-R AArch64:
> > 1. The Armv8-R AArch64 profile does not support the EL3.
> > 2. The Armv8-R AArch64 EL2 only supports a PMSA, which Linux does not
> > support. So it's necessary to drop into EL1 before entering the kernel.
> > 3. There is no EL2 booting code for Armv8-R AArch64 and no
> > configuration for dropping to EL1 in boot-wrapper.
> >
> > These patches enable boot-wrapper booting Linux with Armv8-R AArch64:
> > Patch 1 allows boot-wrapper to boot on more platforms.
> > Patch 2 renames some labels as preparations for booting from lower EL.
> > Patch 3 remove the redundant setup_stack.
> > Patch 4-5 does some preparations for lower EL booting.
> > Patch 6 prepares for GICv3 initialization with EL2.
> > Patch 7 adds necessary EL2 registers.
> > Patch 8 adds auto-detection for Armv8-R AArch64 to drop into EL1
> > before entering the kernel.
> 
> So I reviewed the whole series (replies with the missing tags for 2/8 and 8/8
> are on the list), and am now happy with it.
> I also tested this for regressions with various v8-A models. I had some issues
> with the SMMU on RevC models, but this was also with boot-wrapper master
> and is unrelated to this series (as the kernel starts booting).
> 
> So from my point of view this is good to go. Please let us know if you need
> more information or how we can help with anything to get this merged.
> 
> Cheers,
> Andre
> 
> > Refs: Arm Architecture Reference Manual Supplement - Armv8, for
> > Armv8-R AArch64 architecture profile.
> > [https://developer.arm.com/documentation/ddi0600/latest/]
> >
> > ---
> > v2 -> v3:
> > 1. Refine Patch 1 and move relevant changes into Patch 5 and 8.
> > 2. Refine Patch 8, more detailed comments and guarantees that those
> > CPUID fields never lose features when the value in a field increases.
> >
> > Jaxson Han (8):
> >   Decouple V2M_SYS config by auto-detect dtb node
> >   aarch64: Rename labels and prepare for lower EL booting
> >   aarch64: Remove the redundant setup_stack
> >   aarch64: Prepare for EL1 booting
> >   aarch64: Prepare for lower EL booting
> >   gic-v3: Prepare for gicv3 with EL2
> >   aarch64: Prepare for booting with EL2
> >   aarch64: Introduce EL2 boot code for Armv8-R AArch64
> >
> >  Makefile.am                       |   4 +-
> >  arch/aarch32/include/asm/gic-v3.h |   7 ++
> >  arch/aarch64/boot.S               | 151 +++++++++++++++++++++++++++---
> >  arch/aarch64/include/asm/cpu.h    |   3 +
> >  arch/aarch64/include/asm/gic-v3.h |  38 +++++++-
> >  arch/aarch64/psci.S               |  13 +--
> >  arch/aarch64/spin.S               |   8 +-
> >  arch/aarch64/utils.S              |  10 +-
> >  gic-v3.c                          |   2 +-
> >  platform.c                        |   4 +
> >  10 files changed, 208 insertions(+), 32 deletions(-)
> >


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