linux-kernel - Re: [PATCH v3 01/12] KVM: arm64: selftests: Add MMIO readl/writel support

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Date:   Thu, 2 Sep 2021 13:17:49 -0700
From:   Oliver Upton <oupton@...gle.com>
To:     Raghavendra Rao Ananta <rananta@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
        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>,
        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 v3 01/12] KVM: arm64: selftests: Add MMIO readl/writel support

On Wed, Sep 1, 2021 at 3:43 PM Raghavendra Rao Ananta
<rananta@...gle.com> wrote:
>
> On Wed, Sep 1, 2021 at 2:23 PM Oliver Upton <oupton@...gle.com> wrote:
> >
> > On Wed, Sep 01, 2021 at 09:14:01PM +0000, Raghavendra Rao Ananta wrote:
> > > Define the readl() and writel() functions for the guests to
> > > access (4-byte) the MMIO region.
> > >
> > > The routines, and their dependents, are inspired from the kernel's
> > > arch/arm64/include/asm/io.h and arch/arm64/include/asm/barrier.h.
> > >
> > > Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
> > > ---
> > >  .../selftests/kvm/include/aarch64/processor.h | 45 ++++++++++++++++++-
> > >  1 file changed, 44 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
> > > index c0273aefa63d..3cbaf5c1e26b 100644
> > > --- a/tools/testing/selftests/kvm/include/aarch64/processor.h
> > > +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
> > > @@ -130,6 +130,49 @@ void vm_install_sync_handler(struct kvm_vm *vm,
> > >       val;                                                              \
> > >  })
> > >
> > > -#define isb()        asm volatile("isb" : : : "memory")
> > > +#define isb()                asm volatile("isb" : : : "memory")
> >
> > Is this a stray diff?
> >
> Oh no, that's intentional. Just trying to align with others below.

You are of course right, I read the diff wrong and didn't think it was
correctly aligned.

Thanks,
Oliver