linux-kernel - Re: [PATCH v2 15/18] KVM: arm64: Introduce __pkvm_host_mkyoung

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Message-ID: <Z1lnBDBNq_PKKN4l@google.com>
Date: Wed, 11 Dec 2024 10:18:44 +0000
From: Quentin Perret <qperret@...gle.com>
To: Fuad Tabba <tabba@...gle.com>
Cc: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Vincent Donnefort <vdonnefort@...gle.com>,
	Sebastian Ene <sebastianene@...gle.com>,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 15/18] KVM: arm64: Introduce
 __pkvm_host_mkyoung_guest()

On Wednesday 11 Dec 2024 at 10:11:17 (+0000), Fuad Tabba wrote:
> Hi Quentin,
> 
> On Tue, 10 Dec 2024 at 19:46, Quentin Perret <qperret@...gle.com> wrote:
> >
> > On Tuesday 10 Dec 2024 at 15:14:03 (+0000), Fuad Tabba wrote:
> > > > +int __pkvm_host_mkyoung_guest(u64 gfn, struct pkvm_hyp_vcpu *vcpu)
> > > > +{
> > > > +       struct pkvm_hyp_vm *vm = pkvm_hyp_vcpu_to_hyp_vm(vcpu);
> > > > +       u64 ipa = hyp_pfn_to_phys(gfn);
> > > > +       u64 phys;
> > > > +       int ret;
> > > > +
> > > > +       host_lock_component();
> > > > +       guest_lock_component(vm);
> > > > +
> > > > +       ret = __check_host_unshare_guest(vm, &phys, ipa);
> > >
> > > While I'm bikeshedding some more, does the name
> > > __check_host_unshare_guest() make sense? Should it be something like
> > > __check_host_changeperm_guest(), or something along those lines? (feel
> > > free to ignore this :) )
> >
> > I understand the comment, but not a huge fan of 'changeperm' as that
> > sounds like we're only allowing permission changes while we use this
> > all over the place. Maybe __check_host_is_shared_guest()? Naming is
> > hard, so happy to take suggestions :-)
> 
> I've gone and done it now :) I almost like that, it's the *is* part I
> don't like since it implied a boolean return. Maybe just
> __check_host_shared_guest(), no is?

Deal!

Cheers,
Quentin