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Message-Id: <1741980536-3865-1-git-send-email-nunodasneves@linux.microsoft.com>
Date: Fri, 14 Mar 2025 12:28:46 -0700
From: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
To: linux-hyperv@...r.kernel.org,
x86@...nel.org,
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Subject: [PATCH v6 00/10] Introduce /dev/mshv root partition driver
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
--
2.34.1
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