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[34.76.131.216]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4256af54ecasm154237255e9.12.2024.07.01.07.18.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Jul 2024 07:18:40 -0700 (PDT) Date: Mon, 1 Jul 2024 14:18:39 +0000 From: Sebastian Ene To: Vincent Donnefort Cc: akpm@linux-foundation.org, alexghiti@rivosinc.com, ankita@nvidia.com, ardb@kernel.org, catalin.marinas@arm.com, christophe.leroy@csgroup.eu, james.morse@arm.com, mark.rutland@arm.com, maz@kernel.org, oliver.upton@linux.dev, rananta@google.com, ryan.roberts@arm.com, shahuang@redhat.com, suzuki.poulose@arm.com, will@kernel.org, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel-team@android.com Subject: Re: [PATCH v7 5/6] KVM: arm64: Initialize the ptdump parser with stage-2 attributes Message-ID: References: <20240621123230.1085265-1-sebastianene@google.com> <20240621123230.1085265-6-sebastianene@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, Jul 01, 2024 at 09:42:43AM +0100, Vincent Donnefort wrote: > O Fri, Jun 21, 2024 at 12:32:29PM +0000, 'Sebastian Ene' via kernel-team wrote: > > Define a set of attributes used by the ptdump parser to display the > > properties of a guest memory region covered by a pagetable descriptor. > > Build a description of the pagetable levels and initialize the parser > > with this configuration. > > > > Signed-off-by: Sebastian Ene > > --- > > arch/arm64/kvm/ptdump.c | 143 ++++++++++++++++++++++++++++++++++++++-- > > 1 file changed, 137 insertions(+), 6 deletions(-) > > > > diff --git a/arch/arm64/kvm/ptdump.c b/arch/arm64/kvm/ptdump.c > > index 36dc7662729f..cc1d4fdddc6e 100644 > > --- a/arch/arm64/kvm/ptdump.c > > +++ b/arch/arm64/kvm/ptdump.c > > @@ -14,6 +14,61 @@ > > #include > > > > > > +#define MARKERS_LEN (2) > > +#define KVM_PGTABLE_MAX_LEVELS (KVM_PGTABLE_LAST_LEVEL + 1) > > + > > +struct kvm_ptdump_guest_state { > > + struct kvm *kvm; > > + struct pg_state parser_state; > > + struct addr_marker ipa_marker[MARKERS_LEN]; > > + struct pg_level level[KVM_PGTABLE_MAX_LEVELS]; > > + struct ptdump_range range[MARKERS_LEN]; > > +}; > > + > > +static const struct prot_bits stage2_pte_bits[] = { > > + { > > + .mask = PTE_VALID, > > + .val = PTE_VALID, > > + .set = " ", > > + .clear = "F", > > + }, { > > + .mask = KVM_PTE_LEAF_ATTR_HI_S2_XN | PTE_VALID, > > + .val = KVM_PTE_LEAF_ATTR_HI_S2_XN | PTE_VALID, > > + .set = "XN", > > + .clear = " ", > > + }, { > > + .mask = KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R | PTE_VALID, > > + .val = KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R | PTE_VALID, > > + .set = "R", > > + .clear = " ", > > + }, { > > + .mask = KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W | PTE_VALID, > > + .val = KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W | PTE_VALID, > > + .set = "W", > > + .clear = " ", > > + }, { > > + .mask = KVM_PTE_LEAF_ATTR_LO_S2_AF | PTE_VALID, > > + .val = KVM_PTE_LEAF_ATTR_LO_S2_AF | PTE_VALID, > > + .set = "AF", > > + .clear = " ", > > + }, { > > + .mask = PTE_NG, > > + .val = PTE_NG, > > + .set = "FnXS", > > + .clear = " ", > > + }, { > > + .mask = PTE_CONT | PTE_VALID, > > + .val = PTE_CONT | PTE_VALID, > > + .set = "CON", > > + .clear = " ", > > + }, { > > + .mask = PTE_TABLE_BIT, > > > > + .val = PTE_TABLE_BIT, > > + .set = " ", > > + .clear = "BLK", > > + }, Hello Vincent, > > When doing a kvm_pgtable_stage2_set_owner(), the walker will init a leaf which > has both the table-bit and the valid-bit unset. I believe this would lead to > spurious BLK annotations here. > > The following should fix this problem: > > .mask = PTE_TABLE_BIT | PTE_VALID, > .val = PTE_VALID, > .set = "BLK", > .clear = " ", > Let me try this, thanks for the suggestion ! > > +}; > > + > > static int kvm_ptdump_visitor(const struct kvm_pgtable_visit_ctx *ctx, > > enum kvm_pgtable_walk_flags visit) > > { > > @@ -40,15 +95,79 @@ static int kvm_ptdump_show_common(struct seq_file *m, > > return kvm_pgtable_walk(pgtable, 0, BIT(pgtable->ia_bits), &walker); > > } > > > > [...] Seb