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=-5.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 61CCBC433DF for ; Tue, 21 Jul 2020 03:28:10 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 2C67320792 for ; Tue, 21 Jul 2020 03:28:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="twZKlFpT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2C67320792 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=b9zw2wNu6QT86RgQXoOOxBBS3ZRiOKXgxel5k9dBEAU=; b=twZKlFpTaUsbfvNmFQj1pGC2B ZQI/amPBlQk1h+c5EME3qeZ8UQnOTif7gqHKtCsz8Ha3y7K2/pFMN6JV7xPOSoRaOt4GtPC32TFjr Ae0ZK0X33/8MpJvfPagPG9QHb6eAZKkywxHCPvLwKEr+CLGc2Achl8ly1FXhsOzFuoKfiJNQa0T3i y+5/yJSLGotQQeU9jJnChr4SY9j3psuxtBHuwJ6teRhMSZUel/FIbUJgJA3LqSj7BdE8Kwn5BER83 skzd9PYlDpVZJqW+qjhkdWKgKJTE3KprRjJRHZenVi/wQezQ5rVVTdrMj2nMNMPs0RLacEw7Koypw dFxNU5J2g==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jxiva-0001HV-2o; Tue, 21 Jul 2020 03:26:50 +0000 Received: from szxga07-in.huawei.com ([45.249.212.35] helo=huawei.com) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jxivW-0001FX-DT for linux-arm-kernel@lists.infradead.org; Tue, 21 Jul 2020 03:26:47 +0000 Received: from DGGEMS408-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id A0D07E63F265E152B026; Tue, 21 Jul 2020 11:26:39 +0800 (CST) Received: from [10.174.187.22] (10.174.187.22) by DGGEMS408-HUB.china.huawei.com (10.3.19.208) with Microsoft SMTP Server id 14.3.487.0; Tue, 21 Jul 2020 11:26:31 +0800 Subject: Re: [PATCH 0/9] arm64: Stolen time support To: Steven Price References: <20190802145017.42543-1-steven.price@arm.com> From: zhukeqian Message-ID: <1611996b-1ec1-dee7-ed61-b3b9df23f138@huawei.com> Date: Tue, 21 Jul 2020 11:26:30 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1 MIME-Version: 1.0 In-Reply-To: <20190802145017.42543-1-steven.price@arm.com> X-Originating-IP: [10.174.187.22] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200720_232646_715056_2ABE2CC4 X-CRM114-Status: GOOD ( 14.84 ) 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: kvm@vger.kernel.org, linux-doc@vger.kernel.org, Catalin Marinas , Russell King , xiexiangyou@huawei.com, linux-kernel@vger.kernel.org, yebiaoxiang@huawei.com, "wanghaibin.wang@huawei.com >> Wanghaibin \(D\)" , Marc Zyngier , Paolo Bonzini , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Steven, On 2019/8/2 22:50, Steven Price wrote: > 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 Do you plan to pick up LPT support? As there is demand of cross-frequency migration (from older platform to newer platform). I am not clear about the overheads and approach problem here, could you please give some detail information? Maybe we can work together to solve these concerns. :-) Thanks, Keqian > specification, and I expect an updated version of the specification to > be released soon with just the stolen time parts. > > I previously posted a series including LPT (as well as stolen time): > https://lore.kernel.org/kvmarm/20181212150226.38051-1-steven.price@arm.com/ > > Patches 2, 5, 7 and 8 are cleanup patches and could be taken separately. > > 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/virtual/kvm/arm/pvtime.txt | 107 +++++++++++++ > 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 | 13 +- > arch/arm64/include/asm/kvm_mmu.h | 2 + > arch/arm64/include/asm/pvclock-abi.h | 20 +++ > arch/arm64/include/uapi/asm/kvm.h | 6 + > arch/arm64/kernel/Makefile | 1 + > arch/arm64/kernel/cpu_errata.c | 80 ++++------ > arch/arm64/kernel/kvm.c | 155 ++++++++++++++++++ > arch/arm64/kvm/Kconfig | 1 + > arch/arm64/kvm/Makefile | 2 + > arch/arm64/kvm/handle_exit.c | 4 +- > include/kvm/arm_hypercalls.h | 44 ++++++ > 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 | 18 +++ > virt/kvm/arm/hypercalls.c | 138 ++++++++++++++++ > virt/kvm/arm/mmu.c | 44 ++++++ > virt/kvm/arm/psci.c | 84 +--------- > virt/kvm/arm/pvtime.c | 190 +++++++++++++++++++++++ > virt/kvm/kvm_main.c | 6 +- > 27 files changed, 848 insertions(+), 153 deletions(-) > create mode 100644 Documentation/virtual/kvm/arm/pvtime.txt > create mode 100644 arch/arm64/include/asm/pvclock-abi.h > create mode 100644 arch/arm64/kernel/kvm.c > create mode 100644 include/kvm/arm_hypercalls.h > create mode 100644 virt/kvm/arm/hypercalls.c > create mode 100644 virt/kvm/arm/pvtime.c > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel