From patchwork Wed Feb 26 23:07:54 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: 869011 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id F401A19597F; Wed, 26 Feb 2025 23:08:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740611340; cv=none; b=l93cbCSuq1ak/Fs0fzvKmbscknQifohEccsigjauQL18s9RHaG4PScCWe27ZN/CSxbhfMHHaLmQIJBffpUMhda7OQ99ydGyiTFnbYW2J4cTeP3wc32TYxRMOFLxTydETf0/QxQ7br9582Xhhzsvvi+AUI2SK5/aBcQCElBieEjI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740611340; c=relaxed/simple; bh=ZebPFwCxMEWBUraXVn7cAy7LhzzBqgUECRkpu1XPMkE=; h=From:To:Cc:Subject:Date:Message-Id; b=iJHywbTcr0MYTI4AA+YUqPu2zZWlwCRNGTg2Yz9PICign6nZEGfTDeQIwxd6V0fkewcT9b/wZoAsD3z+vkHl6XdDah0ZdwVqDxzUZ0IOrhylTFyoOIkSWiqVaty+/2f8+0yEcK5IaIz2FynIhVQP06PdiEdYvAP2WunN2dPocMg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=UKMSUvEv; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="UKMSUvEv" Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id 7463B210EAC2; Wed, 26 Feb 2025 15:08:58 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 7463B210EAC2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1740611338; bh=lWL9w60RgCFJvxxxcjzNA366fYz5ZKlmrqBqiOc+Q/g=; h=From:To:Cc:Subject:Date:From; b=UKMSUvEv3THtmb9g5aJiCCDyMciP7ngSYzLOlZsEfYIlPXKPGvB2TRsNtJmqddGYU tH11c73Be9Yhta0hqTigHkzGT2UnIsvlEVX3bbhRoIlC/pLu04nIm977y8hCo9IvUo Tw6a0qyunjQu8u67QPyY/bCTHgaRgpP2difIJaac= 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, linux-acpi@vger.kernel.org Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, mhklinux@outlook.com, 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, Tianyu.Lan@microsoft.com, stanislav.kinsburskiy@gmail.com, gregkh@linuxfoundation.org, vkuznets@redhat.com, prapal@linux.microsoft.com, muislam@microsoft.com, anrayabh@linux.microsoft.com, rafael@kernel.org, lenb@kernel.org, corbet@lwn.net Subject: [PATCH v5 00/10] Introduce /dev/mshv root partition driver Date: Wed, 26 Feb 2025 15:07:54 -0800 Message-Id: <1740611284-27506-1-git-send-email-nunodasneves@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 v4 of this series was last 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 is needed by 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 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: Convert Hyper-V status codes to 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 | 12 + 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 | 105 +- drivers/hv/hv_proc.c | 16 +- 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 | 128 + drivers/hv/mshv_portid_table.c | 84 + drivers/hv/mshv_root.h | 321 +++ drivers/hv/mshv_root_hv_call.c | 876 +++++++ drivers/hv/mshv_root_main.c | 2329 +++++++++++++++++ drivers/hv/mshv_synic.c | 665 +++++ include/asm-generic/mshyperv.h | 18 + include/hyperv/hvgdk_mini.h | 64 +- include/hyperv/hvhdk.h | 132 +- include/hyperv/hvhdk_mini.h | 91 + include/uapi/linux/mshv.h | 287 ++ 25 files changed, 6248 insertions(+), 29 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