From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E3664C433ED for ; Fri, 9 Apr 2021 03:37:12 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 28E9061175 for ; Fri, 9 Apr 2021 03:37:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 28E9061175 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id A7A344BCC4; Thu, 8 Apr 2021 23:37:11 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu 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 a1g0A4b+xgo9; Thu, 8 Apr 2021 23:37:10 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 6433E4BC93; Thu, 8 Apr 2021 23:37:10 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 2198C4B8A4 for ; Thu, 8 Apr 2021 23:37:09 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu 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 2-Byzcf+B-CJ for ; Thu, 8 Apr 2021 23:37:06 -0400 (EDT) Received: from szxga07-in.huawei.com (szxga07-in.huawei.com [45.249.212.35]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 210234B78D for ; Thu, 8 Apr 2021 23:37:06 -0400 (EDT) Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4FGkK515WQz9xgL; Fri, 9 Apr 2021 11:34:49 +0800 (CST) Received: from DESKTOP-TMVL5KK.china.huawei.com (10.174.187.128) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.498.0; Fri, 9 Apr 2021 11:36:54 +0800 From: Yanan Wang To: Marc Zyngier , Will Deacon , "Alexandru Elisei" , Catalin Marinas , , , , Subject: [PATCH v4 0/2] KVM: arm64: Improve efficiency of stage2 page table Date: Fri, 9 Apr 2021 11:36:50 +0800 Message-ID: <20210409033652.28316-1-wangyanan55@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 MIME-Version: 1.0 X-Originating-IP: [10.174.187.128] X-CFilter-Loop: Reflected X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Hi, This series makes some efficiency improvement of stage2 page table code, and there are some test results to quantify the benefit of each patch. Changelogs: v3->v4: - perform D-cache flush if we are not mapping device memory - rebased on top of mainline v5.12-rc6 - v3: https://lore.kernel.org/lkml/20210326031654.3716-1-wangyanan55@huawei.com/ v2->v3: - drop patch #3 in v2 - retest v3 based on v5.12-rc2 - v2: https://lore.kernel.org/lkml/20210310094319.18760-1-wangyanan55@huawei.com/ v1->v2: - rebased on top of mainline v5.12-rc2 - also move CMOs of I-cache to the fault handlers - retest v2 based on v5.12-rc2 - v1: https://lore.kernel.org/lkml/20210208112250.163568-1-wangyanan55@huawei.com/ About this v4 series: Patch #1: We currently uniformly permorm CMOs of D-cache and I-cache in function user_mem_abort before calling the fault handlers. If we get concurrent guest faults(e.g. translation faults, permission faults) or some really unnecessary guest faults caused by BBM, CMOs for the first vcpu are necessary while the others later are not. By moving CMOs to the fault handlers, we can easily identify conditions where they are really needed and avoid the unnecessary ones. As it's a time consuming process to perform CMOs especially when flushing a block range, so this solution reduces much load of kvm and improve efficiency of the page table code. So let's move both clean of D-cache and invalidation of I-cache to the map path and move only invalidation of I-cache to the permission path. Since the original APIs for CMOs in mmu.c are only called in function user_mem_abort, we now also move them to pgtable.c. After this patch, in function stage2_map_walker_try_leaf (map path), we flush D-cache if we are not mapping device memory and invalidate I-cache if we are adding executable permission. And in the function stage2_attr_walker (permission path), we invalidate I-cache if we are adding executable permission. The logic is consistent with current code in user_mem_abort (without this patch). The following results represent the benefit of patch #1 alone, and they were tested by [1] (kvm/selftest) that I have posted recently. [1] https://lore.kernel.org/lkml/20210302125751.19080-1-wangyanan55@huawei.com/ When there are muitiple vcpus concurrently accessing the same memory region, we can test the execution time of KVM creating new mappings, updating the permissions of old mappings from RO to RW, and rebuilding the blocks after they have been split. hardware platform: HiSilicon Kunpeng920 Server host kernel: Linux mainline v5.12-rc2 cmdline: ./kvm_page_table_test -m 4 -s anonymous -b 1G -v 80 (80 vcpus, 1G memory, page mappings(normal 4K)) KVM_CREATE_MAPPINGS: before 104.35s -> after 90.42s +13.35% KVM_UPDATE_MAPPINGS: before 78.64s -> after 75.45s + 4.06% cmdline: ./kvm_page_table_test -m 4 -s anonymous_thp -b 20G -v 40 (40 vcpus, 20G memory, block mappings(THP 2M)) KVM_CREATE_MAPPINGS: before 15.66s -> after 6.92s +55.80% KVM_UPDATE_MAPPINGS: before 178.80s -> after 123.35s +31.00% KVM_REBUILD_BLOCKS: before 187.34s -> after 131.76s +30.65% cmdline: ./kvm_page_table_test -m 4 -s anonymous_hugetlb_1gb -b 20G -v 40 (40 vcpus, 20G memory, block mappings(HUGETLB 1G)) KVM_CREATE_MAPPINGS: before 104.54s -> after 3.70s +96.46% KVM_UPDATE_MAPPINGS: before 174.20s -> after 115.94s +33.44% KVM_REBUILD_BLOCKS: before 103.95s -> after 2.96s +97.15% Patch #2: A new method to distinguish cases of memcache allocations is introduced. By comparing fault_granule and vma_pagesize, cases that require allocations from memcache and cases that don't can be distinguished completely. Yanan Wang (2): KVM: arm64: Move CMOs from user_mem_abort to the fault handlers KVM: arm64: Distinguish cases of memcache allocations completely arch/arm64/include/asm/kvm_mmu.h | 31 --------------- arch/arm64/kvm/hyp/pgtable.c | 68 +++++++++++++++++++++++++------- arch/arm64/kvm/mmu.c | 48 ++++++++-------------- 3 files changed, 69 insertions(+), 78 deletions(-) -- 2.19.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm