linux-kernel - Re: [PATCH v2 13/18] KVM: arm64: Introduce __pkvm_host_wrprotect

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Message-ID: <Z1iYsVFgs1Cjwp2x@google.com>
Date: Tue, 10 Dec 2024 19:38:25 +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 13/18] KVM: arm64: Introduce
 __pkvm_host_wrprotect_guest()

On Tuesday 10 Dec 2024 at 15:06:53 (+0000), Fuad Tabba wrote:
> > +static void handle___pkvm_host_wrprotect_guest(struct kvm_cpu_context *host_ctxt)
> > +{
> > +       DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
> > +       DECLARE_REG(u64, gfn, host_ctxt, 2);
> > +       struct pkvm_hyp_vm *hyp_vm;
> > +       int ret = -EINVAL;
> > +
> > +       if (!is_protected_kvm_enabled())
> > +               goto out;
> > +
> > +       hyp_vm = get_pkvm_hyp_vm(handle);
> > +       if (!hyp_vm)
> > +               goto out;
> > +       if (pkvm_hyp_vm_is_protected(hyp_vm))
> > +               goto put_hyp_vm;
> 
> These checks are (unsurprisingly) the same for all these functions.
> Does it make sense to have a helper do these checks?

Yup, that makes sense and should simplify the error handling on all the
call sites. I'll probably call that get_np_pkvm_hyp_vm() or something
along those lines and shove in pkvm.c in v3.