linux-kernel - Re: [RFC PATCH v2 23/26] KVM: arm64: Refactor __populate_fault

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Message-ID: <YBwCQVi2JUxKUy9Y@google.com>
Date:   Thu, 4 Feb 2021 14:18:41 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     Will Deacon <will@...nel.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, android-kvm@...gle.com,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        Fuad Tabba <tabba@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        David Brazdil <dbrazdil@...gle.com>
Subject: Re: [RFC PATCH v2 23/26] KVM: arm64: Refactor __populate_fault_info()

On Wednesday 03 Feb 2021 at 15:58:32 (+0000), Will Deacon wrote:
> On Fri, Jan 08, 2021 at 12:15:21PM +0000, Quentin Perret wrote:
> > Refactor __populate_fault_info() to introduce __get_fault_info() which
> > will be used once the host is wrapped in a stage 2.
> > 
> > Signed-off-by: Quentin Perret <qperret@...gle.com>
> > ---
> >  arch/arm64/kvm/hyp/include/hyp/switch.h | 36 +++++++++++++++----------
> >  1 file changed, 22 insertions(+), 14 deletions(-)
> > 
> > diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
> > index 84473574c2e7..e9005255d639 100644
> > --- a/arch/arm64/kvm/hyp/include/hyp/switch.h
> > +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
> > @@ -157,19 +157,9 @@ static inline bool __translate_far_to_hpfar(u64 far, u64 *hpfar)
> >  	return true;
> >  }
> >  
> > -static inline bool __populate_fault_info(struct kvm_vcpu *vcpu)
> > +static inline bool __get_fault_info(u64 esr, u64 *far, u64 *hpfar)
> 
> Could this take a pointer to a struct kvm_vcpu_fault_info instead?

The disr_el1 field will be unused in this case, but yes, that should
work.

Cheers,
Quentin