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[34.78.232.44]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37189857069sm10401322f8f.47.2024.08.19.05.18.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Aug 2024 05:18:59 -0700 (PDT) Date: Mon, 19 Aug 2024 12:18:57 +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 v8 5/6] KVM: arm64: Initialize the ptdump parser with stage-2 attributes Message-ID: References: <20240816123906.3683425-1-sebastianene@google.com> <20240816123906.3683425-6-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, Aug 19, 2024 at 11:28:19AM +0100, Vincent Donnefort wrote: > > [...] > > > +static int kvm_ptdump_build_levels(struct ptdump_pg_level *level, u32 start_lvl) > > +{ > > + static const char * const level_names[] = {"PGD", "PUD", "PMD", "PTE"}; > > + u32 i = 0; > > + u64 mask = 0; > > + > > + if (start_lvl > 2) { > > + pr_err("invalid start_lvl %u\n", start_lvl); > > + return -EINVAL; > > + } > > It looks like a duplicate of the if below. I will drop this. > > > + > > + if (WARN_ON_ONCE(start_lvl >= KVM_PGTABLE_LAST_LEVEL)) > > + return -EINVAL; > > + > > + for (i = 0; i < ARRAY_SIZE(stage2_pte_bits); i++) > > + mask |= stage2_pte_bits[i].mask; > > + > > + for (i = start_lvl; i < KVM_PGTABLE_MAX_LEVELS; i++) { > > + strscpy(level[i].name, level_names[i], sizeof(level[i].name)); > > + > > + level[i].num = ARRAY_SIZE(stage2_pte_bits); > > + level[i].bits = stage2_pte_bits; > > + level[i].mask = mask; > > + } > > + > > + if (start_lvl > 0) > > + strscpy(level[start_lvl].name, "PGD", sizeof(level[start_lvl].name)); > > + > > + return 0; > > +} > > + > > +static struct kvm_ptdump_guest_state > > +*kvm_ptdump_parser_init(struct kvm *kvm) > > nit: I guess it's more a "create" than an "init" as we allocate the memory. Yes, that should work as well. > > > +{ > > + struct kvm_ptdump_guest_state *st; > > + struct kvm_s2_mmu *mmu = &kvm->arch.mmu; > > + struct kvm_pgtable *pgtable = mmu->pgt; > > + int ret; > > + > > + st = kzalloc(sizeof(struct kvm_ptdump_guest_state), GFP_KERNEL_ACCOUNT); > > + if (!st) > > + return NULL; > > return ERR_PTR(-ENOMEM); ? Yep, we can encode the ENOMEM in the ptr. > > > + > > + ret = kvm_ptdump_build_levels(&st->level[0], pgtable->start_level); > > + if (ret) { > > + kfree(st); > > + return ERR_PTR(ret); > > + } > > + > > + st->ipa_marker[0].name = "Guest IPA"; > > + st->ipa_marker[1].start_address = BIT(pgtable->ia_bits); > > + st->range[0].end = BIT(pgtable->ia_bits); > > + > > + st->kvm = kvm; > > + st->parser_state = (struct ptdump_pg_state) { > > + .marker = &st->ipa_marker[0], > > + .level = -1, > > + .pg_level = &st->level[0], > > + .ptdump.range = &st->range[0], > > + }; > > + > > + return st; > > +} > > + > > [...] Thanks, Seb