linux-kernel - Re: [PATCH v4 29/34] KVM: arm64: Refactor stage2_map_set_prot

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Date:   Fri, 12 Mar 2021 05:10:09 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     Will Deacon <will@...nel.org>
Cc:     catalin.marinas@....com, maz@...nel.org, james.morse@....com,
        julien.thierry.kdev@...il.com, suzuki.poulose@....com,
        android-kvm@...gle.com, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org, tabba@...gle.com,
        mark.rutland@....com, dbrazdil@...gle.com, mate.toth-pal@....com,
        seanjc@...gle.com, robh+dt@...nel.org, ardb@...nel.org
Subject: Re: [PATCH v4 29/34] KVM: arm64: Refactor stage2_map_set_prot_attr()

On Thursday 11 Mar 2021 at 18:48:36 (+0000), Will Deacon wrote:
> On Wed, Mar 10, 2021 at 05:57:46PM +0000, Quentin Perret wrote:
> > In order to ease its re-use in other code paths, refactor
> > stage2_map_set_prot_attr() to not depend on a stage2_map_data struct.
> > No functional change intended.
> > 
> > Signed-off-by: Quentin Perret <qperret@...gle.com>
> > ---
> >  arch/arm64/kvm/hyp/pgtable.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> > index e4670b639726..c16e0306dd9a 100644
> > --- a/arch/arm64/kvm/hyp/pgtable.c
> > +++ b/arch/arm64/kvm/hyp/pgtable.c
> > @@ -489,8 +489,7 @@ u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift)
> >  	return vtcr;
> >  }
> >  
> > -static int stage2_map_set_prot_attr(enum kvm_pgtable_prot prot,
> > -				    struct stage2_map_data *data)
> > +static int stage2_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep)
> >  {
> >  	bool device = prot & KVM_PGTABLE_PROT_DEVICE;
> >  	kvm_pte_t attr = device ? PAGE_S2_MEMATTR(DEVICE_nGnRE) :
> > @@ -510,7 +509,8 @@ static int stage2_map_set_prot_attr(enum kvm_pgtable_prot prot,
> >  
> >  	attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S2_SH, sh);
> >  	attr |= KVM_PTE_LEAF_ATTR_LO_S2_AF;
> > -	data->attr = attr;
> > +	*ptep = attr;
> > +
> >  	return 0;
> >  }
> >  
> > @@ -728,7 +728,7 @@ int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
> >  		.arg		= &map_data,
> >  	};
> >  
> > -	ret = stage2_map_set_prot_attr(prot, &map_data);
> > +	ret = stage2_set_prot_attr(prot, &map_data.attr);
> >  	if (ret)
> >  		return ret;
> 
> (nit: this is now different to hyp_map_set_prot_attr() -- can we do the same
> thing there, please?)

Will do.

Thanks,
Quentin