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=-17.0 required=3.0 tests=BAYES_00,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 824E2C433DB for ; Wed, 6 Jan 2021 20:34:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5B72923136 for ; Wed, 6 Jan 2021 20:34:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727300AbhAFUeh (ORCPT ); Wed, 6 Jan 2021 15:34:37 -0500 Received: from mail-wm1-f50.google.com ([209.85.128.50]:53454 "EHLO mail-wm1-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727115AbhAFUeg (ORCPT ); Wed, 6 Jan 2021 15:34:36 -0500 Received: by mail-wm1-f50.google.com with SMTP id k10so3448379wmi.3; Wed, 06 Jan 2021 12:34:19 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Mhlu1tTfXO6P+FCugagf3OwfYcUHlDCcg/eJOpRPSrE=; b=mTCNT9Qj+ZJyZQnGgLwGSWsOs2IEjY7w36xTgQLuIpOlwmwvJjyIcxNrjok06e+rPK EUrmAx4Jh0bugcQnyA9wZDfvTukz6SgTvSBORN6Z2NsCv3NTLskAK4uLc8tV0SC7Eg3S PgfdCCgEvy/H3cpNMUe7Gc2mOzrKn6z4PNPzEa7uMwGe8uwcN9jP2amdJ789nO/kbZ04 aL0P8KKv8aTAU4nLOM/Kqneyt8JfgW0ufSFz7d5+32IicST7/TSn6+ArxRUb8waJhkLF b+9V4+ubGASqFk0DcMUdfke+ip8mz2oyVxXawaV9h3S2tyMv+b/LlncfN2N3T1BUulgW WGgA== X-Gm-Message-State: AOAM530OZOD61pSYyxYLWuFbflebBngG/XOm8whhX8H+X5879+7mzUyD Pn5HLJiI9uQ46fqpbzjmc0O5CAhbzFY= X-Google-Smtp-Source: ABdhPJxJSV5vs03ACfKiggc7zSy+VVNSNbEjICgke3R+iSI0E5wXlaSM2XRRWEQI5R10Bm12ZSQXwQ== X-Received: by 2002:a1c:1bc6:: with SMTP id b189mr5075372wmb.71.1609965234086; Wed, 06 Jan 2021 12:33:54 -0800 (PST) Received: from liuwe-devbox-debian-v2.j3c5onc20sse1dnehy4noqpfcg.zx.internal.cloudapp.net ([51.145.34.42]) by smtp.gmail.com with ESMTPSA id u9sm4499456wmb.32.2021.01.06.12.33.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 Jan 2021 12:33:53 -0800 (PST) From: Wei Liu To: Linux on Hyper-V List Cc: virtualization@lists.linux-foundation.org, Linux Kernel List , Michael Kelley , Vineeth Pillai , Sunil Muthuswamy , Nuno Das Neves , Wei Liu , sameo@linux.intel.com, robert.bradford@intel.com, sebastien.boeuf@intel.com Subject: [PATCH v4 00/17] Introducing Linux root partition support for Microsoft Hypervisor Date: Wed, 6 Jan 2021 20:33:33 +0000 Message-Id: <20210106203350.14568-1-wei.liu@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all Here we propose this patch series to make Linux run as the root partition [0] on Microsoft Hypervisor [1]. There will be a subsequent patch series to provide a device node (/dev/mshv) such that userspace programs can create and run virtual machines. We've also ported Cloud Hypervisor [3] over and have been able to boot a Linux guest with Virtio devices since late July 2020. This series implements only the absolutely necessary components to get things running. A large portion of this series consists of patches that augment hyperv-tlfs.h. They should be rather uncontroversial and can be applied right away. A few key things other than the changes to hyperv-tlfs.h: 1. Linux needs to setup existing Hyper-V facilities differently. 2. Linux needs to make a few hypercalls to bring up APs. 3. Interrupts are remapped by IOMMU, which is controlled by the hypervisor. Linux needs to make hypercalls to map and unmap interrupts. This is done by introducing a new MSI irqdomain and new irqchips. This series is now based on 5.11-rc2. Comments and suggestions are welcome. Thanks, Wei. [0] Just think of it like Xen's Dom0. [1] Hyper-V is more well-known, but it really refers to the whole stack including the hypervisor and other components that run in Windows kernel and userspace. [3] https://github.com/cloud-hypervisor/ Cc: sameo@linux.intel.com Cc: robert.bradford@intel.com Cc: sebastien.boeuf@intel.com Changes since v3: 1. Fix compilation errors. 2. Adapt to upstream changes. Changes since v2: 1. Address more comments from Vitaly. 2. Fix and test 32bit build. Changes since v1: 1. Simplify MSI IRQ domain implementation. 2. Address Vitaly's comments. Wei Liu (17): asm-generic/hyperv: change HV_CPU_POWER_MANAGEMENT to HV_CPU_MANAGEMENT x86/hyperv: detect if Linux is the root partition Drivers: hv: vmbus: skip VMBus initialization if Linux is root iommu/hyperv: don't setup IRQ remapping when running as root clocksource/hyperv: use MSR-based access if running as root x86/hyperv: allocate output arg pages if required x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary x86/hyperv: handling hypercall page setup for root x86/hyperv: provide a bunch of helper functions x86/hyperv: implement and use hv_smp_prepare_cpus asm-generic/hyperv: update hv_msi_entry asm-generic/hyperv: update hv_interrupt_entry asm-generic/hyperv: introduce hv_device_id and auxiliary structures asm-generic/hyperv: import data structures for mapping device interrupts x86/hyperv: implement an MSI domain for root partition x86/ioapic: export a few functions and data structures via io_apic.h x86/hyperv: handle IO-APIC when running as root arch/x86/hyperv/Makefile | 4 +- arch/x86/hyperv/hv_init.c | 120 +++++- arch/x86/hyperv/hv_proc.c | 225 +++++++++++ arch/x86/hyperv/irqdomain.c | 559 ++++++++++++++++++++++++++++ arch/x86/include/asm/hyperv-tlfs.h | 23 ++ arch/x86/include/asm/io_apic.h | 22 ++ arch/x86/include/asm/mshyperv.h | 16 +- arch/x86/kernel/apic/io_apic.c | 25 +- arch/x86/kernel/cpu/mshyperv.c | 49 +++ drivers/clocksource/hyperv_timer.c | 3 + drivers/hv/vmbus_drv.c | 3 + drivers/iommu/hyperv-iommu.c | 3 +- drivers/pci/controller/pci-hyperv.c | 2 +- include/asm-generic/hyperv-tlfs.h | 254 ++++++++++++- 14 files changed, 1272 insertions(+), 36 deletions(-) create mode 100644 arch/x86/hyperv/hv_proc.c create mode 100644 arch/x86/hyperv/irqdomain.c base-commit: e71ba9452f0b5b2e8dc8aa5445198cd9214a6a62 -- 2.20.1