From patchwork Tue Oct 15 10:48:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jianyong Wu X-Patchwork-Id: 11190047 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 1E55A14ED for ; Tue, 15 Oct 2019 10:48:59 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EC23D217F9 for ; Tue, 15 Oct 2019 10:48:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="hUjCQCUL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EC23D217F9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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: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:In-Reply-To: References:List-Owner; bh=o8rWwozjL7Ifs5ZBGZ6fzTNtwK8Fp4rmS7p/ocWpyVk=; b=hUj CQCULQpkK2lRfqf11pCznI9SqpI1BzLTL+QHfPqKXZMYR7j+Cu/2FllEVABSMKojgW1XldMUIIkLr BFG+jHfp5MS4BCE0NsPFne5wGHvURGtISNmCcqbHm1bvo9z4N1gmXMInBzdHpZZpziYetYhI0qFME TTizrvnS2Qc7EuKtBhdlsT/bfCL363Ucy25kYWrDvO2UTqB7F6Y4Da9le+C/3jYT6LJ4CCIYdqGPH nQDq+lxiU/C1mfOTpxqc+0Nv1xz1htaa8OaTtkLtB+lkJ64LfeSOksq9u/QCIlG1ogTDQqDOH7m5J AQtGnEAV17IVNsiz47rp+fywe6I+EzQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iKKNu-0004xr-Hv; Tue, 15 Oct 2019 10:48:58 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iKKNr-0004wt-C5 for linux-arm-kernel@lists.infradead.org; Tue, 15 Oct 2019 10:48:57 +0000 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 64EFE28; Tue, 15 Oct 2019 03:48:53 -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 A23423F68E; Tue, 15 Oct 2019 03:48:48 -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 Subject: [RFC PATCH v5 0/6] Enable ptp_kvm for arm64 Date: Tue, 15 Oct 2019 18:48:16 +0800 Message-Id: <20191015104822.13890-1-jianyong.wu@arm.com> X-Mailer: git-send-email 2.17.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191015_034855_500451_1FCED815 X-CRM114-Status: GOOD ( 10.42 ) X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: justin.he@arm.com, kvm@vger.kernel.org, Steve.Capper@arm.com, jianyong.wu@arm.com, linux-kernel@vger.kernel.org, Kaly.Xin@arm.com, nd@arm.com, kvmarm@lists.cs.columbia.edu, 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 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 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 Jianyong Wu (6): psci: Export psci_ops.conduit symbol as modules will use it. ptp: Reorganize ptp_kvm modules to make it arch-independent. timekeeping: Add clocksource to system_time_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 drivers/clocksource/arm_arch_timer.c | 27 +++++++ drivers/firmware/psci/psci.c | 6 ++ drivers/ptp/Kconfig | 2 +- drivers/ptp/Makefile | 1 + drivers/ptp/ptp_kvm_arm64.c | 54 +++++++++++++ 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 | 5 ++ include/linux/arm-smccc.h | 14 +++- include/linux/psci.h | 1 + include/linux/timekeeping.h | 35 +++++---- include/uapi/linux/kvm.h | 1 + kernel/time/timekeeping.c | 7 +- virt/kvm/arm/arm.c | 1 + virt/kvm/arm/psci.c | 21 +++++ 16 files changed, 270 insertions(+), 81 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