From patchwork Fri Apr 20 14:54:06 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Punit Agrawal X-Patchwork-Id: 10352935 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 34D47600CC for ; Fri, 20 Apr 2018 14:57:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 253AD2877F for ; Fri, 20 Apr 2018 14:57:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 19FEF2879D; Fri, 20 Apr 2018 14:57:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 824C82877F for ; Fri, 20 Apr 2018 14:57:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=8XiGiEWg94nA/CWO0zArfQyzOATdE5iS/vSogI8TCQ4=; b=ltfJjk8pOOn8hJ4N8kWku57Ym7 +PA6m4eW3dFHKQtaIUNLlzcaTMfDO6KAmsQPGWzHqp7hQ0bvZfd9Ug974YIHV76IwdpVRwegzgFTd qtY0JDX+Dn5f/JT/J4/KzeQHDApjPH5cz/tJqYNuRKtLKGwFOJ4+kpthdo1eOvGgYBkoGZ32AWMy/ iD3tGs6R6Vh3NcGp4rtRaKYv8/vJnZc9dH/UAmDdyRCQGUTwgcenzverTXA/ioSYyEfKQ60KDtWKU ax5IRU1WkuVUgQ7S47Z1l1m1RDhKz0luXSpXxIVSATHvx592QrmHwkRcdctwaly+345GW85+2OWj6 cyucH1Qw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1f9XTX-00087q-Ub; Fri, 20 Apr 2018 14:57:23 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1f9XRf-0006V2-D5 for linux-arm-kernel@lists.infradead.org; Fri, 20 Apr 2018 14:55:36 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D0E8B80D; Fri, 20 Apr 2018 07:55:16 -0700 (PDT) Received: from localhost (e105922-lin.cambridge.arm.com [10.1.207.29]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 759263F59D; Fri, 20 Apr 2018 07:55:16 -0700 (PDT) From: Punit Agrawal To: kvmarm@lists.cs.columbia.edu Subject: [PATCH 1/4] KVM: arm/arm64: Share common code in user_mem_abort() Date: Fri, 20 Apr 2018 15:54:06 +0100 Message-Id: <20180420145409.24485-2-punit.agrawal@arm.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180420145409.24485-1-punit.agrawal@arm.com> References: <20180420145409.24485-1-punit.agrawal@arm.com> X-ARM-No-Footer: FoSSMail X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180420_075527_537267_59BF464D X-CRM114-Status: GOOD ( 15.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: suzuki.poulose@arm.com, marc.zyngier@arm.com, Punit Agrawal , christoffer.dall@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Reviewed-by: Christoffer Dall --- virt/kvm/arm/mmu.c | 36 +++++++++++++++++++++--------------- 1 file changed, 21 insertions(+), 15 deletions(-) diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index 7f6a944db23d..db382c7c7cd7 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -1428,7 +1428,7 @@ 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); @@ -1448,7 +1448,8 @@ 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 { @@ -1517,23 +1518,33 @@ 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 if other THP sizes are supported. + */ hugetlb = transparent_hugepage_adjust(&pfn, &fault_ipa); + 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) { 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)) @@ -1546,16 +1557,11 @@ 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))