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s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=a+AAcJ6ze5ORWcYt1xTVFSOlHJup8dNwU5icmHAVEJo=; b=kGbycQ1kAF1PzBEvgsF9h/+y6IHOEFMXFOHHFwwnlTWG1PkAgaSAdfXNrl3j6XPV/5 HUlx9wAVogz1NLieGyrxSnLYk8CMKwJuC6jyT6HM4xk4TGeyEqHXCqkIxK6UBWc0tCqx bIX8i+glwjv+GVcye7IcLJlwPJBbIBhmcNm8TjlmSf/tmQyfiPFRwYcKTb72dWtHr5/z xYz+pD4Vz7hRyoFkYoG3IFSmRNM70VTRKEJgbJaF2mj1Inz+Ny6eG6tseGUf+ncM4QcN Cs1qZEX4njF4CBQSamaB5vy7fj8QE9dsuaBnJqERjuxPUBejM7X9zJZr19txYR4Vnm9o slkw== X-Gm-Message-State: AOAM530Xvo+a+b4WEGZLfhM+Q/PBvgZ0DZ9QgakNRJ9EE272GarMFcBB BjTeB9DyM8cXD24MUgh6FGMUKNtY020L5/MTzj0oFg== X-Google-Smtp-Source: ABdhPJxJmYW88Ev1ks/v9+BGAp05ASceu2cDL3gJmffO4wJWaGzGP8q2pDY2O4Csdw373h0sW7M8fDiO3qm0JSuaM2k= X-Received: by 2002:a67:bb15:: with SMTP id m21mr2888819vsn.26.1629208403329; Tue, 17 Aug 2021 06:53:23 -0700 (PDT) MIME-Version: 1.0 References: <20210809152448.1810400-1-qperret@google.com> <20210809152448.1810400-5-qperret@google.com> In-Reply-To: <20210809152448.1810400-5-qperret@google.com> From: Andrew Walbran Date: Tue, 17 Aug 2021 14:53:11 +0100 Message-ID: Subject: Re: [PATCH v4 04/21] KVM: arm64: Introduce helper to retrieve a PTE and its level To: Quentin Perret Cc: Marc Zyngier , James Morse , alexandru.elisei@arm.com, Suzuki K Poulose , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, ardb@kernel.org, Fuad Tabba , David Brazdil , Android Kernel Team X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210817_065324_625960_1B8059F4 X-CRM114-Status: GOOD ( 26.16 ) 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: multipart/mixed; boundary="===============5238542823319269318==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============5238542823319269318== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000002a08e905c9c1a43d" --0000000000002a08e905c9c1a43d Content-Type: text/plain; charset="UTF-8" On Mon, 9 Aug 2021 at 16:25, Quentin Perret wrote: > > From: Marc Zyngier > > It is becoming a common need to fetch the PTE for a given address > together with its level. Add such a helper. > > Signed-off-by: Marc Zyngier > Signed-off-by: Quentin Perret > --- > arch/arm64/include/asm/kvm_pgtable.h | 19 ++++++++++++++ > arch/arm64/kvm/hyp/pgtable.c | 39 ++++++++++++++++++++++++++++ > 2 files changed, 58 insertions(+) > > diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h > index f004c0115d89..082b9d65f40b 100644 > --- a/arch/arm64/include/asm/kvm_pgtable.h > +++ b/arch/arm64/include/asm/kvm_pgtable.h > @@ -432,6 +432,25 @@ int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size); > int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size, > struct kvm_pgtable_walker *walker); > > +/** > + * kvm_pgtable_get_leaf() - Walk a page-table and retrieve the leaf entry > + * with its level. > + * @pgt: Page-table structure initialised by kvm_pgtable_*_init(). > + * @addr: Input address for the start of the walk. > + * @ptep: Pointer to storage for the retrieved PTE. > + * @level: Pointer to storage for the level of the retrieved PTE. > + * > + * The offset of @addr within a page is ignored. > + * > + * The walker will walk the page-table entries corresponding to the input > + * address specified, retrieving the leaf corresponding to this address. > + * Invalid entries are treated as leaf entries. > + * > + * Return: 0 on success, negative error code on failure. > + */ > +int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr, > + kvm_pte_t *ptep, u32 *level); > + > /** > * kvm_pgtable_stage2_find_range() - Find a range of Intermediate Physical > * Addresses with compatible permission > diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c > index 05321f4165e3..78f36bd5df6c 100644 > --- a/arch/arm64/kvm/hyp/pgtable.c > +++ b/arch/arm64/kvm/hyp/pgtable.c > @@ -326,6 +326,45 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size, > return _kvm_pgtable_walk(&walk_data); > } > > +struct leaf_walk_data { > + kvm_pte_t pte; > + u32 level; > +}; > + > +static int leaf_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, > + enum kvm_pgtable_walk_flags flag, void * const arg) > +{ > + struct leaf_walk_data *data = arg; > + > + data->pte = *ptep; > + data->level = level; > + > + return 0; > +} > + > +int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr, > + kvm_pte_t *ptep, u32 *level) > +{ > + struct leaf_walk_data data; > + struct kvm_pgtable_walker walker = { > + .cb = leaf_walker, > + .flags = KVM_PGTABLE_WALK_LEAF, > + .arg = &data, > + }; > + int ret; > + > + ret = kvm_pgtable_walk(pgt, ALIGN_DOWN(addr, PAGE_SIZE), > + PAGE_SIZE, &walker); > + if (!ret) { > + if (ptep) > + *ptep = data.pte; > + if (level) > + *level = data.level; > + } > + > + return ret; > +} > + > struct hyp_map_data { > u64 phys; > kvm_pte_t attr; > -- > 2.32.0.605.g8dce9f2422-goog > Reviewed-by: Andrew Walbran --0000000000002a08e905c9c1a43d Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 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