From patchwork Mon Aug 19 14:04:27 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 11101077 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5CFD2912 for ; Mon, 19 Aug 2019 14:05:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4D6F02843B for ; Mon, 19 Aug 2019 14:05:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3FD9C28830; Mon, 19 Aug 2019 14:05:49 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B89FE2839C for ; Mon, 19 Aug 2019 14:05:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727040AbfHSOEp (ORCPT ); Mon, 19 Aug 2019 10:04:45 -0400 Received: from foss.arm.com ([217.140.110.172]:54904 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726736AbfHSOEo (ORCPT ); Mon, 19 Aug 2019 10:04:44 -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 E064628; Mon, 19 Aug 2019 07:04:43 -0700 (PDT) Received: from e112269-lin.arm.com (e112269-lin.cambridge.arm.com [10.1.196.133]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DD9BC3F718; Mon, 19 Aug 2019 07:04:41 -0700 (PDT) From: Steven Price To: Marc Zyngier , Will Deacon , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Cc: Steven Price , Catalin Marinas , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Russell King , James Morse , Julien Thierry , Suzuki K Pouloze , Mark Rutland , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 0/9] arm64: Stolen time support Date: Mon, 19 Aug 2019 15:04:27 +0100 Message-Id: <20190819140436.12207-1-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This series add support for paravirtualized time for arm64 guests and KVM hosts following the specification in Arm's document DEN 0057A: https://developer.arm.com/docs/den0057/a It implements support for stolen time, allowing the guest to identify time when it is forcibly not executing. It doesn't implement support for Live Physical Time (LPT) as there are some concerns about the overheads and approach in the above specification, and I expect an updated version of the specification to be released soon with just the stolen time parts. NOTE: Patches 7 and 8 will conflict with Mark Rutland's series[1] cleaning up the SMCCC conduit. I do feel that the addition of an _invoke() call makes a number of call sites cleaner and it should be possible to integrate both this and Mark's other cleanups. [1] https://lore.kernel.org/linux-arm-kernel/20190809132245.43505-1-mark.rutland@arm.com/ Changes from v1: https://lore.kernel.org/lkml/20190802145017.42543-1-steven.price@arm.com/ * Host kernel no longer allocates the stolen time structure, instead it is allocated by user space. This means the save/restore functionality can be removed. * Refactored the code so arm has stub implementations and to avoid initcall * Rebased to pick up Documentation/{virt->virtual} change * Bunch of typo fixes Christoffer Dall (1): KVM: arm/arm64: Factor out hypercall handling from PSCI code Steven Price (8): KVM: arm64: Document PV-time interface KVM: arm64: Implement PV_FEATURES call KVM: arm64: Support stolen time reporting via shared structure KVM: Allow kvm_device_ops to be const KVM: arm64: Provide a PV_TIME device to user space arm/arm64: Provide a wrapper for SMCCC 1.1 calls arm/arm64: Make use of the SMCCC 1.1 wrapper arm64: Retrieve stolen time as paravirtualized guest Documentation/virt/kvm/arm/pvtime.txt | 100 +++++++++++++ arch/arm/include/asm/kvm_host.h | 21 +++ arch/arm/kvm/Makefile | 2 +- arch/arm/kvm/handle_exit.c | 2 +- arch/arm/mm/proc-v7-bugs.c | 13 +- arch/arm64/include/asm/kvm_host.h | 19 ++- arch/arm64/include/asm/paravirt.h | 9 +- arch/arm64/include/asm/pvclock-abi.h | 17 +++ arch/arm64/include/uapi/asm/kvm.h | 8 ++ arch/arm64/kernel/cpu_errata.c | 80 ++++------- arch/arm64/kernel/paravirt.c | 147 +++++++++++++++++++ arch/arm64/kernel/time.c | 3 + arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/Makefile | 2 + arch/arm64/kvm/handle_exit.c | 4 +- include/kvm/arm_hypercalls.h | 43 ++++++ include/kvm/arm_psci.h | 2 +- include/linux/arm-smccc.h | 58 ++++++++ include/linux/cpuhotplug.h | 1 + include/linux/kvm_host.h | 4 +- include/linux/kvm_types.h | 2 + include/uapi/linux/kvm.h | 2 + virt/kvm/arm/arm.c | 20 +++ virt/kvm/arm/hypercalls.c | 68 +++++++++ virt/kvm/arm/psci.c | 84 +---------- virt/kvm/arm/pvtime.c | 194 ++++++++++++++++++++++++++ virt/kvm/kvm_main.c | 6 +- 27 files changed, 758 insertions(+), 154 deletions(-) create mode 100644 Documentation/virt/kvm/arm/pvtime.txt create mode 100644 arch/arm64/include/asm/pvclock-abi.h create mode 100644 include/kvm/arm_hypercalls.h create mode 100644 virt/kvm/arm/hypercalls.c create mode 100644 virt/kvm/arm/pvtime.c