From patchwork Wed Jul 24 16:25:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julien Grall X-Patchwork-Id: 169620 Delivered-To: patch@linaro.org Received: by 2002:a92:4782:0:0:0:0:0 with SMTP id e2csp10466251ilk; Wed, 24 Jul 2019 09:25:50 -0700 (PDT) X-Google-Smtp-Source: APXvYqxZ+epjRBDlgfs2ptdTGlNNGfzHgqYYf+o5tGltri36ne0/uD7b+4rzAOg+Aq51axzaltM1 X-Received: by 2002:a17:90a:8c92:: with SMTP id b18mr86810887pjo.97.1563985550243; Wed, 24 Jul 2019 09:25:50 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1563985550; cv=none; d=google.com; s=arc-20160816; b=fK2oYjsQfao79xTmHM7pQGP2P8F3FiaKJfOg52+yxU23klxz8Ax2EUNfyLc7MpJPr7 JlFuv0VLkdNInsMt44KW9WoZRjbUFgo+BnO1WS8FU2swgJWDtbAT7l/oB+9FTNHlKWaY 67EGsklON9WvFj56zHq7cLirzyjh8lPMftWCKZBjg0YuxhG0y2TPI2ZD5DPnoQWWgCXf PESVHT8u4rGP/rrtJ7EGBodQHVXtx8BrK7lf9mq7JFAXXCSNo4SyJL2Imfuk0rh7ksAd /sWSY4dnE+eRNlA/6DoG51tHAGBHqmcgqKyubbowq71/KPUTsF6gnGJWo9T1L5o64IUf iBxg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:message-id:date:subject:cc:to:from; bh=FkQFkF5namMZ2xiqV8krliyEf+yHgeiGbjfcenQJiPg=; b=Ft+qX93SOqRriMULgSO6C68voQI2QmYjzE9sWRR5B6bdr5aarvoeT2+HgcxeJgtF+J W6S1vz29utLyuMOew+iNlLqqWtOZ5TG6HP0WDlYGC7CA0WNIo5zchdj+HTKAV8+Q75cW 8zE/oFZd2FpJ8rk3RH52Jz1D9YaOH+ZH4/oC0/WaN0gP2tUyROfbMY7+bjYVWwCUwS6W eeAU+/oovsyKss/lJLGxudcDWeloYIpGrKSPm6KtvyW5v403/SSWtX5wEtZ2o97wp2b5 xLBP1OopMB7tNRoZmWcD/7sCwHiCuOvr8p+uN8JJwZAkKKa+it5nzhDgcSTDaSH1FKsc RluA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id s62si13071508pjc.75.2019.07.24.09.25.49; Wed, 24 Jul 2019 09:25:50 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727670AbfGXQZs (ORCPT + 29 others); Wed, 24 Jul 2019 12:25:48 -0400 Received: from foss.arm.com ([217.140.110.172]:43326 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726099AbfGXQZs (ORCPT ); Wed, 24 Jul 2019 12:25:48 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3172428; Wed, 24 Jul 2019 09:25:47 -0700 (PDT) Received: from e108454-lin.cambridge.arm.com (e108454-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id B58EA3F71F; Wed, 24 Jul 2019 09:25:45 -0700 (PDT) From: Julien Grall To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Cc: james.morse@arm.com, marc.zyngier@arm.com, julien.thierry@arm.com, suzuki.poulose@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, Julien Grall , Russell King Subject: [PATCH v3 00/15] kvm/arm: Align the VMID allocation with the arm64 ASID one Date: Wed, 24 Jul 2019 17:25:19 +0100 Message-Id: <20190724162534.7390-1-julien.grall@arm.com> X-Mailer: git-send-email 2.11.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, This patch series is moving out the ASID allocator in a separate file in order to re-use it for the VMID. The benefits are: - CPUs are not forced to exit on a roll-over. - Context invalidation is now per-CPU rather than broadcasted. There are no performance regression on the fastpath for ASID allocation. Actually on the hackbench measurement (300 hackbench) it was .7% faster. The measurement was made on a Seattle based SoC (8 CPUs), with the number of VMID limited to 4-bit. The test involves running concurrently 40 guests with 2 vCPUs. Each guest will then execute hackbench 5 times before exiting. The performance difference (on 5.1-rc1) between the current algo and the new one are: - 2.5% less exit from the guest - 22.4% more flush, although they are now local rather than broadcasted - 0.11% faster (just for the record) The ASID allocator rework to make it generic has been divided in multiple patches to make the review easier. A branch with the patch based on 5.3-rc1 can be found: http://xenbits.xen.org/gitweb/?p=people/julieng/linux-arm.git;a=shortlog;h=refs/heads/vmid-rework/v3 For all the changes see in each patch. Best regards, Cc: Russell King Julien Grall (15): arm64/mm: Introduce asid_info structure and move asid_generation/asid_map to it arm64/mm: Move active_asids and reserved_asids to asid_info arm64/mm: Move bits to asid_info arm64/mm: Move the variable lock and tlb_flush_pending to asid_info arm64/mm: Remove dependency on MM in new_context arm64/mm: Store the number of asid allocated per context arm64/mm: Introduce NUM_ASIDS arm64/mm: Split asid_inits in 2 parts arm64/mm: Split the function check_and_switch_context in 3 parts arm64/mm: Introduce a callback to flush the local context arm64: Move the ASID allocator code in a separate file arm64/lib: Add an helper to free memory allocated by the ASID allocator arm/kvm: Introduce a new VMID allocator arch/arm64: Introduce a capability to tell whether 16-bit VMID is available kvm/arm: Align the VMID allocation with the arm64 ASID one arch/arm/include/asm/kvm_asm.h | 2 +- arch/arm/include/asm/kvm_host.h | 5 +- arch/arm/include/asm/kvm_hyp.h | 1 + arch/arm/include/asm/kvm_mmu.h | 3 +- arch/arm/include/asm/lib_asid.h | 79 +++++++++++++++ arch/arm/kvm/Makefile | 1 + arch/arm/kvm/hyp/tlb.c | 8 +- arch/arm64/include/asm/cpucaps.h | 3 +- arch/arm64/include/asm/kvm_asid.h | 8 ++ arch/arm64/include/asm/kvm_asm.h | 2 +- arch/arm64/include/asm/kvm_host.h | 5 +- arch/arm64/include/asm/kvm_mmu.h | 7 +- arch/arm64/include/asm/lib_asid.h | 79 +++++++++++++++ arch/arm64/kernel/cpufeature.c | 9 ++ arch/arm64/kvm/hyp/tlb.c | 10 +- arch/arm64/lib/Makefile | 2 + arch/arm64/lib/asid.c | 190 ++++++++++++++++++++++++++++++++++++ arch/arm64/mm/context.c | 200 +++++--------------------------------- virt/kvm/arm/arm.c | 125 +++++++++--------------- 19 files changed, 458 insertions(+), 281 deletions(-) create mode 100644 arch/arm/include/asm/lib_asid.h create mode 100644 arch/arm64/include/asm/kvm_asid.h create mode 100644 arch/arm64/include/asm/lib_asid.h create mode 100644 arch/arm64/lib/asid.c -- 2.11.0