From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7B48433ADAD for ; Mon, 16 Mar 2026 17:55:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773683702; cv=none; b=A8kslBc65AZoAl1ZqvurKw3ylATwbT/nF+LZFGpKsnHjPvKf6ZeVsLRXktAzEsWvRSbHsKPCowyXIDI1mtYocinYKIfCihkWWCN2Bs2nD9ydN6/nLE0cG5vo8j2+tDVLjeaA6IL6Df3GW5X0UTYbRm7ia7/5NeVv9THOxGDFBBo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773683702; c=relaxed/simple; bh=jB+Gd1Qxp6irh08/3d+mSbcEd/e2O103zpAA1r2Qbqg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KtIqRgDPzkjUpg2ucaEm0h6vo1GqkJ679wZwz8ajYd4VzEYdmNFoik+muACku1ruZiNx0BegRT5M8rUU71Fa17NQj0wkj/AxMKF/MwVlZmanLH/IyrULNQQN67A5VUgJlUxMhcUs1FZBdgcSktg9mZj9JocEUinVN3WtywNpBEw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Esr4Xzvu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Esr4Xzvu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A894C2BCB2; Mon, 16 Mar 2026 17:55:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773683702; bh=jB+Gd1Qxp6irh08/3d+mSbcEd/e2O103zpAA1r2Qbqg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Esr4XzvupwGd95q8qih39T3lNTnhLmakcLH0p7GVV59MDyWzYkFAYWIcZjf53HDwd nQEgoLGTYIIRkMBRyqfhDqtjLvAyWKWdHCLE36ImpTgPka/mFtki6zSqPtTtLMFTwO 1xTh1NuVenP0BIMg9MkKAOCxNWByV0Zwl3ZkU1UdzCikg+WRo9FLoqe4GvIEPP7+VK nqFtrHU0pYXL2bdK0hlQnlFN5xyYcc63t+FihZfsHrHzMIxJjWHGgHkjp2z4fuf6RO OtqlxIS+19Y4czgCFkrCOeVqoF9jRTsxbNAb6J6u7AMnJK/VHYeLAot/zmgFxX4vrJ HRbX0pxkR65Ng== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1w2C9c-00000002XDx-1ozM; 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> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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 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