linux-kernel - Re: [PATCH v8 03/15] KVM: arm64: selftests: Use read/write definitions from sysreg.h

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Date:   Mon, 11 Oct 2021 09:08:36 -0700
From:   Raghavendra Rao Ananta <rananta@...gle.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Andrew Jones <drjones@...hat.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Oliver Upton <oupton@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v8 03/15] KVM: arm64: selftests: Use read/write
 definitions from sysreg.h

Hi Marc,

On Mon, Oct 11, 2021 at 1:15 AM Marc Zyngier <maz@...nel.org> wrote:
>
> Hi Raghavendra,
>
> On Fri, 08 Oct 2021 00:34:27 +0100,
> Raghavendra Rao Ananta <rananta@...gle.com> wrote:
> >
> > Make use of the register read/write definitions from
> > sysreg.h, instead of the existing definitions. A syntax
> > correction is needed for the files that use write_sysreg()
> > to make it compliant with the new (kernel's) syntax.
> >
> > Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
> > Reviewed-by: Oliver Upton <oupton@...gle.com>
> > Reviewed-by: Andrew Jones <drjones@...hat.com>
> > ---
> >  .../selftests/kvm/aarch64/debug-exceptions.c  | 28 +++++++++----------
> >  .../selftests/kvm/include/aarch64/processor.h | 13 +--------
> >  2 files changed, 15 insertions(+), 26 deletions(-)
> >
> > diff --git a/tools/testing/selftests/kvm/aarch64/debug-exceptions.c b/tools/testing/selftests/kvm/aarch64/debug-exceptions.c
> > index e5e6c92b60da..11fd23e21cb4 100644
> > --- a/tools/testing/selftests/kvm/aarch64/debug-exceptions.c
> > +++ b/tools/testing/selftests/kvm/aarch64/debug-exceptions.c
> > @@ -34,16 +34,16 @@ static void reset_debug_state(void)
> >  {
> >       asm volatile("msr daifset, #8");
> >
> > -     write_sysreg(osdlr_el1, 0);
> > -     write_sysreg(oslar_el1, 0);
> > +     write_sysreg(0, osdlr_el1);
> > +     write_sysreg(0, oslar_el1);
>
> The previous patch has obviously introduced significant breakage which
> this patch is now fixing. In the interval, the build is broken, which
> isn't great.
>
> You can either rework this series to work around the issue, or I can
> squash patches #2 and #3 together.

Thanks. I didn't realize this. I'm fine with you squashing the patches
together (I guess I would do the same).

Regards,
Raghavendra
>
> Thanks,
>
>         M.
>
> --
> Without deviation from the norm, progress is not possible.