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Mon, 16 Mar 2026 17:55:00 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Fuad Tabba , Will Deacon , Quentin Perret Subject: [PATCH 05/17] KVM: arm64: Constrain fault_granule to kvm_s2_fault_map() Date: Mon, 16 Mar 2026 17:54:38 +0000 Message-ID: <20260316175451.1866175-6-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260316175451.1866175-1-maz@kernel.org> References: <20260316175451.1866175-1-maz@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com, tabba@google.com, will@kernel.org, qperret@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260316_175505_965197_69548050 X-CRM114-Status: GOOD ( 16.43 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The notion of fault_granule is specific to kvm_s2_fault_map(), and is unused anywhere else. Move this variable locally, removing it from kvm_s2_fault. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/mmu.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 1b32f2e6c3e61..12c2f0aeaae4c 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1724,7 +1724,6 @@ struct kvm_s2_fault { bool logging_active; bool force_pte; long vma_pagesize; - long fault_granule; enum kvm_pgtable_prot prot; struct page *page; vm_flags_t vm_flags; @@ -1908,9 +1907,9 @@ static phys_addr_t get_ipa(const struct kvm_s2_fault *fault) static int kvm_s2_fault_map(const struct kvm_s2_fault_desc *s2fd, struct kvm_s2_fault *fault, void *memcache) { - bool fault_is_perm = kvm_s2_fault_is_perm(s2fd); struct kvm *kvm = s2fd->vcpu->kvm; struct kvm_pgtable *pgt; + long perm_fault_granule; int ret; enum kvm_pgtable_walk_flags flags = KVM_PGTABLE_WALK_SHARED; @@ -1920,14 +1919,17 @@ static int kvm_s2_fault_map(const struct kvm_s2_fault_desc *s2fd, if (mmu_invalidate_retry(kvm, fault->mmu_seq)) goto out_unlock; + perm_fault_granule = (kvm_s2_fault_is_perm(s2fd) ? + kvm_vcpu_trap_get_perm_fault_granule(s2fd->vcpu) : 0); + /* * If we are not forced to use fault->page mapping, check if we are * backed by a THP and thus use block mapping if possible. */ if (fault->vma_pagesize == PAGE_SIZE && !(fault->force_pte || fault->s2_force_noncacheable)) { - if (fault_is_perm && fault->fault_granule > PAGE_SIZE) { - fault->vma_pagesize = fault->fault_granule; + if (perm_fault_granule > PAGE_SIZE) { + fault->vma_pagesize = perm_fault_granule; } else { fault->vma_pagesize = transparent_hugepage_adjust(kvm, s2fd->memslot, s2fd->hva, &fault->pfn, @@ -1940,15 +1942,15 @@ static int kvm_s2_fault_map(const struct kvm_s2_fault_desc *s2fd, } } - if (!fault_is_perm && !fault->s2_force_noncacheable && kvm_has_mte(kvm)) + if (!perm_fault_granule && !fault->s2_force_noncacheable && kvm_has_mte(kvm)) sanitise_mte_tags(kvm, fault->pfn, fault->vma_pagesize); /* * Under the premise of getting a FSC_PERM fault, we just need to relax - * permissions only if fault->vma_pagesize equals fault->fault_granule. Otherwise, + * permissions only if vma_pagesize equals perm_fault_granule. Otherwise, * kvm_pgtable_stage2_map() should be called to change block size. */ - if (fault_is_perm && fault->vma_pagesize == fault->fault_granule) { + if (fault->vma_pagesize == perm_fault_granule) { /* * Drop the SW bits in favour of those stored in the * PTE, which will be preserved. @@ -1984,7 +1986,6 @@ static int user_mem_abort(const struct kvm_s2_fault_desc *s2fd) .logging_active = logging_active, .force_pte = logging_active, .prot = KVM_PGTABLE_PROT_R, - .fault_granule = perm_fault ? kvm_vcpu_trap_get_perm_fault_granule(s2fd->vcpu) : 0, .write_fault = write_fault, .exec_fault = kvm_vcpu_trap_is_exec_fault(s2fd->vcpu), .topup_memcache = !perm_fault || (logging_active && write_fault), -- 2.47.3