From patchwork Thu Oct 24 11:02:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jianyong Wu X-Patchwork-Id: 11208955 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 24B9214E5 for ; Thu, 24 Oct 2019 11:02:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0CA7721929 for ; Thu, 24 Oct 2019 11:02:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392847AbfJXLCj (ORCPT ); Thu, 24 Oct 2019 07:02:39 -0400 Received: from foss.arm.com ([217.140.110.172]:47392 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732328AbfJXLCj (ORCPT ); Thu, 24 Oct 2019 07:02:39 -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 5AE73497; Thu, 24 Oct 2019 04:02:23 -0700 (PDT) Received: from entos-d05.shanghai.arm.com (entos-d05.shanghai.arm.com [10.169.40.35]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 757673F71A; Thu, 24 Oct 2019 04:02:18 -0700 (PDT) From: Jianyong Wu To: netdev@vger.kernel.org, yangbo.lu@nxp.com, john.stultz@linaro.org, tglx@linutronix.de, pbonzini@redhat.com, sean.j.christopherson@intel.com, maz@kernel.org, richardcochran@gmail.com, Mark.Rutland@arm.com, will@kernel.org, suzuki.poulose@arm.com Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Steve.Capper@arm.com, Kaly.Xin@arm.com, justin.he@arm.com, jianyong.wu@arm.com, nd@arm.com Subject: [RFC PATCH v6 0/7] Enable ptp_kvm for arm64 Date: Thu, 24 Oct 2019 19:02:02 +0800 Message-Id: <20191024110209.21328-1-jianyong.wu@arm.com> X-Mailer: git-send-email 2.17.1 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org kvm ptp targets to provide high precision time sync between guest and host in virtualization environment. This patch enable kvm ptp for arm64. This patch set base on [1][2][3] change log: from v5 to v6: (1) apply Mark's patch[4] to get SMCCC conduit. (2) add mechanism to recognize current clocksource by add clocksouce_id value into struct clocksource instead of method in patch-v5. (3) rename kvm_arch_ptp_get_clock_fn into kvm_arch_ptp_get_crosststamp. from v4 to v5: (1) remove hvc delay compensasion as it should leave to userspace. (2) check current clocksource in hvc call service. (3) expose current clocksource by adding it to system_time_snapshot. (4) add helper to check if clocksource is arm_arch_counter. (5) rename kvm_ptp.c to ptp_kvm_common.c from v3 to v4: (1) fix clocksource of ptp_kvm to arch_sys_counter. (2) move kvm_arch_ptp_get_clock_fn into arm_arch_timer.c (3) subtract cntvoff before return cycles from host. (4) use ktime_get_snapshot instead of getnstimeofday and get_current_counterval to return time and counter value. (5) split ktime and counter into two 32-bit block respectively to avoid Y2038-safe issue. (6) set time compensation to device time as half of the delay of hvc call. (7) add ARM_ARCH_TIMER as dependency of ptp_kvm for arm64. from v2 to v3: (1) fix some issues in commit log. (2) add some receivers in send list. from v1 to v2: (1) move arch-specific code from arch/ to driver/ptp/ (2) offer mechanism to inform userspace if ptp_kvm service is available. (3) separate ptp_kvm code for arm64 into hypervisor part and guest part. (4) add API to expose monotonic clock and counter value. (5) refine code: remove no necessary part and reconsitution. [1]https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/ commit/?h=kvm/hvc&id=125ea89e4a21e2fc5235410f966a996a1a7148bf [2]https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/ commit/?h=kvm/hvc&id=464f5a1741e5959c3e4d2be1966ae0093b4dce06 [3]https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/ commit/?h=kvm/hvc&id=6597490e005d0eeca8ed8c1c1d7b4318ee014681 [4]https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/ commit/?h=for-next/smccc-conduit-cleanup&id=6b7fe77c334ae59fed9500140e08f4f896b36871 Jianyong Wu (6): psci: let arm_smccc_1_1_invoke available by modules ptp: Reorganize ptp_kvm modules to make it arch-independent. time: Add mechanism to recognize clocksource in time_get_snapshot psci: Add hvc call service for ptp_kvm. ptp: arm64: Enable ptp_kvm for arm64 kvm: arm64: Add capability check extension for ptp_kvm Mark Rutland (1): arm/arm64: smccc/psci: add arm_smccc_1_1_get_conduit() drivers/clocksource/arm_arch_timer.c | 24 ++++++ drivers/firmware/psci/psci.c | 16 ++++ drivers/ptp/Kconfig | 2 +- drivers/ptp/Makefile | 1 + drivers/ptp/ptp_kvm_arm64.c | 53 +++++++++++++ drivers/ptp/{ptp_kvm.c => ptp_kvm_common.c} | 77 +++++------------- drivers/ptp/ptp_kvm_x86.c | 87 +++++++++++++++++++++ include/asm-generic/ptp_kvm.h | 12 +++ include/clocksource/arm_arch_timer.h | 4 + include/linux/arm-smccc.h | 30 ++++++- include/linux/clocksource.h | 6 ++ include/linux/timekeeping.h | 12 +-- include/uapi/linux/kvm.h | 1 + kernel/time/clocksource.c | 3 + kernel/time/timekeeping.c | 1 + virt/kvm/arm/arm.c | 1 + virt/kvm/arm/psci.c | 22 ++++++ 17 files changed, 286 insertions(+), 66 deletions(-) create mode 100644 drivers/ptp/ptp_kvm_arm64.c rename drivers/ptp/{ptp_kvm.c => ptp_kvm_common.c} (63%) create mode 100644 drivers/ptp/ptp_kvm_x86.c create mode 100644 include/asm-generic/ptp_kvm.h