From mboxrd@z Thu Jan 1 00:00:00 1970 From: Punit Agrawal Subject: [PATCH v6 1/8] KVM: arm/arm64: Share common code in user_mem_abort() Date: Mon, 16 Jul 2018 12:08:50 +0100 Message-ID: <20180716110857.19310-2-punit.agrawal@arm.com> References: <20180716110857.19310-1-punit.agrawal@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 4D44E4A128 for ; Mon, 16 Jul 2018 06:56:25 -0400 (EDT) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kke3113SZubG for ; Mon, 16 Jul 2018 06:56:24 -0400 (EDT) Received: from foss.arm.com (foss.arm.com [217.140.101.70]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 26AE54A10C for ; Mon, 16 Jul 2018 06:56:24 -0400 (EDT) In-Reply-To: <20180716110857.19310-1-punit.agrawal@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: kvmarm@lists.cs.columbia.edu Cc: marc.zyngier@arm.com, Punit Agrawal , will.deacon@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org List-Id: kvmarm@lists.cs.columbia.edu The code for operations such as marking the pfn as dirty, and dcache/icache maintenance during stage 2 fault handling is duplicated between normal pages and PMD hugepages. Instead of creating another copy of the operations when we introduce PUD hugepages, let's share them across the different pagesizes. Signed-off-by: Punit Agrawal Cc: Christoffer Dall Cc: Marc Zyngier --- virt/kvm/arm/mmu.c | 39 +++++++++++++++++++++++---------------- 1 file changed, 23 insertions(+), 16 deletions(-) diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index 1d90d79706bd..1c8d407a92ce 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -1431,7 +1431,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, kvm_pfn_t pfn; pgprot_t mem_type = PAGE_S2; bool logging_active = memslot_is_logging(memslot); - unsigned long flags = 0; + unsigned long vma_pagesize, flags = 0; write_fault = kvm_is_write_fault(vcpu); exec_fault = kvm_vcpu_trap_is_iabt(vcpu); @@ -1451,7 +1451,8 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, return -EFAULT; } - if (vma_kernel_pagesize(vma) == PMD_SIZE && !logging_active) { + vma_pagesize = vma_kernel_pagesize(vma); + if (vma_pagesize == PMD_SIZE && !logging_active) { hugetlb = true; gfn = (fault_ipa & PMD_MASK) >> PAGE_SHIFT; } else { @@ -1520,23 +1521,34 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, if (mmu_notifier_retry(kvm, mmu_seq)) goto out_unlock; - if (!hugetlb && !force_pte) + if (!hugetlb && !force_pte) { + /* + * Only PMD_SIZE transparent hugepages(THP) are + * currently supported. This code will need to be + * updated to support other THP sizes. + */ hugetlb = transparent_hugepage_adjust(&pfn, &fault_ipa); + if (hugetlb) + vma_pagesize = PMD_SIZE; + } + + if (writable) + kvm_set_pfn_dirty(pfn); + + if (fault_status != FSC_PERM) + clean_dcache_guest_page(pfn, vma_pagesize); + + if (exec_fault) + invalidate_icache_guest_page(pfn, vma_pagesize); - if (hugetlb) { + if (hugetlb && vma_pagesize == PMD_SIZE) { pmd_t new_pmd = pfn_pmd(pfn, mem_type); new_pmd = pmd_mkhuge(new_pmd); - if (writable) { + if (writable) new_pmd = kvm_s2pmd_mkwrite(new_pmd); - kvm_set_pfn_dirty(pfn); - } - - if (fault_status != FSC_PERM) - clean_dcache_guest_page(pfn, PMD_SIZE); if (exec_fault) { new_pmd = kvm_s2pmd_mkexec(new_pmd); - invalidate_icache_guest_page(pfn, PMD_SIZE); } else if (fault_status == FSC_PERM) { /* Preserve execute if XN was already cleared */ if (stage2_is_exec(kvm, fault_ipa)) @@ -1549,16 +1561,11 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, if (writable) { new_pte = kvm_s2pte_mkwrite(new_pte); - kvm_set_pfn_dirty(pfn); mark_page_dirty(kvm, gfn); } - if (fault_status != FSC_PERM) - clean_dcache_guest_page(pfn, PAGE_SIZE); - if (exec_fault) { new_pte = kvm_s2pte_mkexec(new_pte); - invalidate_icache_guest_page(pfn, PAGE_SIZE); } else if (fault_status == FSC_PERM) { /* Preserve execute if XN was already cleared */ if (stage2_is_exec(kvm, fault_ipa)) -- 2.17.1