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From: Oliver Upton To: Will Deacon Cc: kvmarm@lists.cs.columbia.edu, Sean Christopherson , Vincent Donnefort , Alexandru Elisei , Catalin Marinas , James Morse , Chao Peng , Quentin Perret , Suzuki K Poulose , Mark Rutland , Fuad Tabba , Marc Zyngier , kernel-team@android.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3 01/25] KVM: arm64: Move hyp refcount manipulation helpers to common header file Message-ID: References: <20220914083500.5118-1-will@kernel.org> <20220914083500.5118-2-will@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220914083500.5118-2-will@kernel.org> X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220915_013607_872253_51AB52DB X-CRM114-Status: GOOD ( 17.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Will, On Wed, Sep 14, 2022 at 09:34:36AM +0100, Will Deacon wrote: > From: Quentin Perret > > We will soon need to manipulate 'struct hyp_page' refcounts from outside > page_alloc.c, so move the helpers to a common header file to allow them > to be reused easily. > > Signed-off-by: Quentin Perret > Signed-off-by: Will Deacon > --- > arch/arm64/kvm/hyp/include/nvhe/memory.h | 18 ++++++++++++++++++ > arch/arm64/kvm/hyp/nvhe/page_alloc.c | 19 ------------------- > 2 files changed, 18 insertions(+), 19 deletions(-) > > diff --git a/arch/arm64/kvm/hyp/include/nvhe/memory.h b/arch/arm64/kvm/hyp/include/nvhe/memory.h > index 592b7edb3edb..418b66a82a50 100644 > --- a/arch/arm64/kvm/hyp/include/nvhe/memory.h > +++ b/arch/arm64/kvm/hyp/include/nvhe/memory.h > @@ -45,4 +45,22 @@ static inline int hyp_page_count(void *addr) > return p->refcount; > } > > +static inline void hyp_page_ref_inc(struct hyp_page *p) > +{ > + BUG_ON(p->refcount == USHRT_MAX); > + p->refcount++; > +} > + > +static inline int hyp_page_ref_dec_and_test(struct hyp_page *p) > +{ > + BUG_ON(!p->refcount); > + p->refcount--; > + return (p->refcount == 0); > +} > + > +static inline void hyp_set_page_refcounted(struct hyp_page *p) > +{ > + BUG_ON(p->refcount); > + p->refcount = 1; > +} It might be good to add a comment mentioning the hyp_pool::lock must be held to update refcounts, as that part is slightly less clear when the helpers are hoisted out of page_alloc.c With that: Reviewed-by: Oliver Upton -- Thanks, Oliver _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel