From patchwork Fri Mar 14 19:28:46 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nuno Das Neves X-Patchwork-Id: 14017362 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 6FC63C282EC for ; Fri, 14 Mar 2025 19:33:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date:Subject:Cc: To:From:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=HVcDUfdWEV/CxlgnXs/WJ2a6+xXKstleyiakidyOz5Y=; b=KRRDOp/9MwboaMvq3KhYj5QzGr C0Xg/ROwqQc/Zp8JaAaU9uiOKk7ejxdH2gDVdicNbUQV8+XQOkEB9BQnK7MoHGtnERA07SNvNINu+ yGjbECtdeZfTNPLHVyV1IL4ceSU5yNqqRRsg5XZxRG5FUCJP0htL2xCkNZ3DkNa9w3cey/O11zM4I xB/zvjFIanSPBQpnIefbXq+mq4QQA2Z83J3bYYwy6N/zrYltsovvvm+b4yEEZ7RGNe+fFoWOTJfs+ 9zlDlEmPmoagXHQpm9JF6EjGvFuCidXnVxrwsSrtCtc9uqWtSI7sCjO7/tJ3KDx4zuFRdaAvTD9M7 DunXVdnw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1ttAm4-0000000F7xE-0UHW; Fri, 14 Mar 2025 19:32:52 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1ttAij-0000000F74L-1GCJ for linux-arm-kernel@lists.infradead.org; Fri, 14 Mar 2025 19:29:26 +0000 Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id E01692033454; Fri, 14 Mar 2025 12:29:23 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com E01692033454 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1741980563; bh=HVcDUfdWEV/CxlgnXs/WJ2a6+xXKstleyiakidyOz5Y=; h=From:To:Cc:Subject:Date:From; b=RT+cdpJMHRpu5zFJKOc4I/uiHnO4Zx4QiWZb67xy0wBe/n2XUGp+EhFp5ZzXIFJ66 aybOf8vbQa9elwwrVrw0U0CPjPXQr3NCRdkGjgxum8IdPVjnaXSHScOn/GhUeSdmh/ hzp6zRISg9zz6Ccnw0EOD9PfyMPsHp8Qzzkfn1EU= From: Nuno Das Neves To: linux-hyperv@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, mhklinux@outlook.com, ltykernel@gmail.com, stanislav.kinsburskiy@gmail.com, linux-acpi@vger.kernel.org, eahariha@linux.microsoft.com, jeff.johnson@oss.qualcomm.com Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, daniel.lezcano@linaro.org, joro@8bytes.org, robin.murphy@arm.com, arnd@arndb.de, jinankjain@linux.microsoft.com, muminulrussell@gmail.com, skinsburskii@linux.microsoft.com, mrathor@linux.microsoft.com, ssengar@linux.microsoft.com, apais@linux.microsoft.com, gregkh@linuxfoundation.org, vkuznets@redhat.com, prapal@linux.microsoft.com, anrayabh@linux.microsoft.com, rafael@kernel.org, lenb@kernel.org, corbet@lwn.net Subject: [PATCH v6 00/10] Introduce /dev/mshv root partition driver Date: Fri, 14 Mar 2025 12:28:46 -0700 Message-Id: <1741980536-3865-1-git-send-email-nunodasneves@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250314_122925_389253_A3AF6AE0 X-CRM114-Status: GOOD ( 19.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series introduces support for creating and running guest virtual machines while running on the Microsoft Hypervisor[0] as root partition. This is done via an IOCTL interface accessed through /dev/mshv, similar to /dev/kvm. Another series introducing this support was previously posted in 2021[1], and versions 1-4 of this series were posted in 2023[2]. Patches 1-4 are small refactors and additions to Hyper-V code. Patches 5-6 just export some definitions needed by /dev/mshv. Patches 7-9 introduce some functionality and definitions in common code, that are specific to the driver. Patch 10 contains the driver code. ----------------- [0] "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. [1] Previous /dev/mshv patch series (2021) and discussion: https://lore.kernel.org/linux-hyperv/1632853875-20261-1-git-send-email-nunodasneves@linux.microsoft.com/ [2] v4 (2023): https://lore.kernel.org/linux-hyperv/1696010501-24584-1-git-send-email-nunodasneves@linux.microsoft.com/ ----------------- Changes since v5: * Rework patch 1: 1. Introduce hv_status_printk() logging macros which print the raw HV_STATUS_ code along with string [Roman Kisel] 2. Iterate over an array of data items to get the string and errno for the hv_result_to_*() functions. [Michael Kelley] 3. Use hv_status_printk() to log errors in hyperv/irqdomain.c and hyperv-iommu.c [Easwar Hariharan] * Minor cleanup, improvements, and commit wording changes in patches 2, 3, 4, 6 [Roman Kisel, Easwar Hariharan, Michael Kelley] * Fix issues with declaration and lifecycle of hv_synic_eventring_tail in patch 7 [Michael Kelley] * Improve detail and clarity of commit message in patch 8 [Michael Kelley] * Minor cleanups in patch 9 - uapi types -> kernel types, #ifdef CONFIG_X86_64 -> CONFIG_X86 for consistency, fix HVCALL_* ordering, remove redundant __packed, use explicit enum value [Stanislav Kinsburskii, Easwar Hariharan, Michael Kelley, Tianyu Lan] * Minor fixes and cleanup in patch 10 [Michael Kelley] * Add MODULE_DESCRIPTION() to patch 10 [Jeff Johnson] Changes since v4: * Slim down the IOCTL interface significantly, via several means: 1. Use generic "passthrough" call MSHV_ROOT_HVCALL to replace many ioctls. 2. Use MSHV_* versions of some of the HV_* definitions. 3. Move hv headers out of uapi altogether, into include/hyperv/, see: https://lore.kernel.org/linux-hyperv/1732577084-2122-1-git-send-email-nunodasneves@linux.microsoft.com/ * Remove mshv_vtl module altogther, it will be posted in followup series * Also remove the parent "mshv" module which didn't serve much purpose * Update and refactor parts of the driver code for clarity, extensibility Changes since v3 (summarized): * Clean up the error and debug logging: 1. Add a set of macros vp_*() and partition_*() which call the equivalent dev_*(), passing the device from the partition struct * The new macros also print the partition and vp ids to aid debugging and reduce repeated code 2. Use dev_*() (mostly via the new macros) instead of pr_*() *almost* everywhere - in interrupt context we can't always get the device struct 3. Remove pr_*() logging from hv_call.c and mshv_root_hv_call.c Changes since v2 (summarized): * Fix many checkpatch.pl --strict style issues * Initialize status in get/set registers hypercall helpers * Add missing return on error in get_vp_signaled_count Changes since v1 (summarized): * Clean up formatting, commit messages Nuno Das Neves (9): hyperv: Log hypercall status codes as strings arm64/hyperv: Add some missing functions to arm64 hyperv: Introduce hv_recommend_using_aeoi() acpi: numa: Export node_to_pxm() Drivers: hv: Export some functions for use by root partition module Drivers: hv: Introduce per-cpu event ring tail x86: hyperv: Add mshv_handler() irq handler and setup function hyperv: Add definitions for root partition driver to hv headers Drivers: hv: Introduce mshv_root module to expose /dev/mshv to VMMs Stanislav Kinsburskii (1): x86/mshyperv: Add support for extended Hyper-V features .../userspace-api/ioctl/ioctl-number.rst | 2 + arch/arm64/hyperv/hv_core.c | 17 + arch/arm64/hyperv/mshyperv.c | 1 + arch/arm64/include/asm/mshyperv.h | 13 + arch/x86/hyperv/irqdomain.c | 6 +- arch/x86/kernel/cpu/mshyperv.c | 16 +- drivers/acpi/numa/srat.c | 1 + drivers/hv/Makefile | 5 +- drivers/hv/hv.c | 12 +- drivers/hv/hv_common.c | 175 +- drivers/hv/hv_proc.c | 13 +- drivers/hv/mshv.h | 30 + drivers/hv/mshv_common.c | 161 ++ drivers/hv/mshv_eventfd.c | 833 ++++++ drivers/hv/mshv_eventfd.h | 71 + drivers/hv/mshv_irq.c | 124 + drivers/hv/mshv_portid_table.c | 84 + drivers/hv/mshv_root.h | 308 +++ drivers/hv/mshv_root_hv_call.c | 852 ++++++ drivers/hv/mshv_root_main.c | 2333 +++++++++++++++++ drivers/hv/mshv_synic.c | 665 +++++ drivers/iommu/hyperv-iommu.c | 4 +- include/asm-generic/mshyperv.h | 34 +- include/hyperv/hvgdk_mini.h | 72 +- include/hyperv/hvhdk.h | 132 +- include/hyperv/hvhdk_mini.h | 91 + include/uapi/linux/mshv.h | 287 ++ 27 files changed, 6266 insertions(+), 76 deletions(-) create mode 100644 drivers/hv/mshv.h create mode 100644 drivers/hv/mshv_common.c create mode 100644 drivers/hv/mshv_eventfd.c create mode 100644 drivers/hv/mshv_eventfd.h create mode 100644 drivers/hv/mshv_irq.c create mode 100644 drivers/hv/mshv_portid_table.c create mode 100644 drivers/hv/mshv_root.h create mode 100644 drivers/hv/mshv_root_hv_call.c create mode 100644 drivers/hv/mshv_root_main.c create mode 100644 drivers/hv/mshv_synic.c create mode 100644 include/uapi/linux/mshv.h