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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 04/17] KVM: arm64: Replace fault_is_perm with a helper Date: Mon, 16 Mar 2026 17:54:37 +0000 Message-ID: <20260316175451.1866175-5-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_964280_BBAACD22 X-CRM114-Status: GOOD ( 15.46 ) 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 Carrying a boolean to indicate that a given fault is slightly odd, as this is a property of the fault itself, and we'd better avoid duplicating state. For this purpose, introduce a kvm_s2_fault_is_perm() predicate that can take a fault descriptor as a parameter. fault_is_perm is therefore dropped from kvm_s2_fault. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/mmu.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 2a7128b8dd14f..1b32f2e6c3e61 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1711,8 +1711,6 @@ static short kvm_s2_resolve_vma_size(const struct kvm_s2_fault_desc *s2fd, } struct kvm_s2_fault { - bool fault_is_perm; - bool write_fault; bool exec_fault; bool writable; @@ -1732,6 +1730,11 @@ struct kvm_s2_fault { vm_flags_t vm_flags; }; +static bool kvm_s2_fault_is_perm(const struct kvm_s2_fault_desc *s2fd) +{ + return kvm_vcpu_trap_is_permission_fault(s2fd->vcpu); +} + static int kvm_s2_fault_get_vma_info(const struct kvm_s2_fault_desc *s2fd, struct kvm_s2_fault *fault) { @@ -1888,7 +1891,7 @@ static int kvm_s2_fault_compute_prot(const struct kvm_s2_fault_desc *s2fd, if (s2fd->nested) adjust_nested_exec_perms(kvm, s2fd->nested, &fault->prot); - if (!fault->fault_is_perm && !fault->s2_force_noncacheable && kvm_has_mte(kvm)) { + if (!kvm_s2_fault_is_perm(s2fd) && !fault->s2_force_noncacheable && kvm_has_mte(kvm)) { /* Check the VMM hasn't introduced a new disallowed VMA */ if (!fault->mte_allowed) return -EFAULT; @@ -1905,6 +1908,7 @@ 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; int ret; @@ -1922,7 +1926,7 @@ static int kvm_s2_fault_map(const struct kvm_s2_fault_desc *s2fd, */ if (fault->vma_pagesize == PAGE_SIZE && !(fault->force_pte || fault->s2_force_noncacheable)) { - if (fault->fault_is_perm && fault->fault_granule > PAGE_SIZE) { + if (fault_is_perm && fault->fault_granule > PAGE_SIZE) { fault->vma_pagesize = fault->fault_granule; } else { fault->vma_pagesize = transparent_hugepage_adjust(kvm, s2fd->memslot, @@ -1936,7 +1940,7 @@ static int kvm_s2_fault_map(const struct kvm_s2_fault_desc *s2fd, } } - if (!fault->fault_is_perm && !fault->s2_force_noncacheable && kvm_has_mte(kvm)) + if (!fault_is_perm && !fault->s2_force_noncacheable && kvm_has_mte(kvm)) sanitise_mte_tags(kvm, fault->pfn, fault->vma_pagesize); /* @@ -1944,7 +1948,7 @@ static int kvm_s2_fault_map(const struct kvm_s2_fault_desc *s2fd, * permissions only if fault->vma_pagesize equals fault->fault_granule. Otherwise, * kvm_pgtable_stage2_map() should be called to change block size. */ - if (fault->fault_is_perm && fault->vma_pagesize == fault->fault_granule) { + if (fault_is_perm && fault->vma_pagesize == fault->fault_granule) { /* * Drop the SW bits in favour of those stored in the * PTE, which will be preserved. @@ -1977,7 +1981,6 @@ static int user_mem_abort(const struct kvm_s2_fault_desc *s2fd) bool write_fault = kvm_is_write_fault(s2fd->vcpu); bool logging_active = memslot_is_logging(s2fd->memslot); struct kvm_s2_fault fault = { - .fault_is_perm = perm_fault, .logging_active = logging_active, .force_pte = logging_active, .prot = KVM_PGTABLE_PROT_R, -- 2.47.3