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Subject[PATCH v6 00/10] Subject: Enable Linux guests on Hyper-V on ARM64
This series enables Linux guests running on Hyper-V on ARM64
hardware. New ARM64-specific code in arch/arm64/hyperv initializes
Hyper-V, including its interrupts and hypercall mechanism.
Existing architecture independent drivers for Hyper-V's VMbus and
synthetic devices just work when built for ARM64. Hyper-V code is
built and included in the image and modules only if CONFIG_HYPERV
is enabled.

The ten patches are organized as follows:
1) Add include files that define the Hyper-V interface as
described in the Hyper-V Top Level Functional Spec (TLFS), plus
additional definitions specific to Linux running on Hyper-V.

2) Add #define for vendor specific owner definition to linux/arm-smccc.h

3) thru 7) Add core Hyper-V support on ARM64, including hypercalls,
interrupt handlers, kexec & panic handlers, and core hypervisor

8) Update the existing VMbus driver to generalize interrupt
management across x86/x64 and ARM64.

9) Export screen_info so it may be used by the Hyper-V frame buffer
driver built as a module. It's already exported for x86,
powerpc, and alpha architectures.

10) Make CONFIG_HYPERV selectable on ARM64 in addition to x86/x64.

Some areas of Linux guests on Hyper-V on ARM64 are a work-

* Hyper-V on ARM64 currently runs with a 4 Kbyte page size, but
allows guests with 16K/64K page size. However, the Linux drivers
for Hyper-V synthetic devices assume the guest page size is 4K.
This patch set lays the groundwork for larger guest page sizes,
but additional patches are coming to update these drivers.

* The Hyper-V vPCI driver at drivers/pci/host/pci-hyperv.c has
x86/x64-specific code and is not being built for ARM64. Fixing
this driver to enable vPCI devices on ARM64 will be done later.

In a few cases, terminology from the x86/x64 world has been carried
over into the ARM64 code ("MSR", "TSC"). Hyper-V still uses the
x86/x64 terminology and has not replaced it with something more
generic, so the code uses the Hyper-V terminology. This will be
fixed when Hyper-V updates the usage in the TLFS.

This patch set is based on a 5.6-rc5 linux-next tree.

Changes in v6:
* Use SMCCC hypercall interface instead of direct invocation
of HVC instruction and the Hyper-V hypercall interface
[Marc Zyngier]
* Reimplemented functions to alloc/free Hyper-V size pages
using kmalloc/kfree since kmalloc now guarantees alignment of
power of 2 size allocations [Marc Zyngier]
* Export screen_info in arm64 architecture so it can be used
by the Hyper-V buffer driver built as a module
* Renamed source file arch/arm64/hyperv/hv_init.c to hv_core.c
to better reflect its content
* Fixed the bit position of certain feature flags presented by
Hyper-V to the guest. The bit positions on ARM64 don't match
the position on x86 like originally thought.
* Minor fixups to rebase to 5.6-rc5 linux-next

Changes in v5:
* Minor fixups to rebase to 5.4-rc1 linux-next

Changes in v4:
* Moved clock-related code into an architecture independent
Hyper-V clocksource driver that is already upstream. Clock
related code is removed from this patch set except for the
ARM64 specific interrupt handler. [Marc Zyngier]
* Separately upstreamed the split of mshyperv.h into arch independent
and arch dependent portions. The arch independent portion has been
removed from this patch set.
* Divided patch #2 of the series into multiple smaller patches
[Marc Zyngier]
* Changed a dozen or so smaller things based on feedback
[Marc Zyngier, Will Deacon]
* Added functions to alloc/free Hyper-V size pages for use by
drivers for Hyper-V synthetic devices when updated to not assume
guest page size and Hyper-v page size are the same

Changes in v3:
* Added initialization of hv_vp_index array like was recently
added on x86 branch [KY Srinivasan]
* Changed Hyper-V ARM64 register symbols to be all uppercase
instead of mixed case [KY Srinivasan]
* Separated mshyperv.h into two files, one architecture
independent and one architecture dependent. After this code
is upstream, will make changes to the x86 code to use the
architecture independent file and remove duplication. And
once we have a multi-architecture Hyper-V TLFS, will do a
separate patch to split hyperv-tlfs.h in the same way.
[KY Srinivasan]
* Minor tweaks to rebase to latest linux-next code

Changes in v2:
* Removed patch to implement slow_virt_to_phys() on ARM64.
Use of slow_virt_to_phys() in arch independent Hyper-V
drivers has been eliminated by commit 6ba34171bcbd
("Drivers: hv: vmbus: Remove use of slow_virt_to_phys()")
* Minor tweaks to rebase to latest linux-next code

Michael Kelley (10):
arm64: hyperv: Add core Hyper-V include files
arm/arm64: smccc-1.1: Add vendor specific owner definition
arm64: hyperv: Add hypercall and register access functions
arm64: hyperv: Add memory alloc/free functions for Hyper-V size pages
arm64: hyperv: Add interrupt handlers for VMbus and stimer
arm64: hyperv: Add kexec and panic handlers
arm64: hyperv: Initialize hypervisor on boot
Drivers: hv: vmbus: Add hooks for per-CPU IRQ
arm64: efi: Export screen_info
Drivers: hv: Enable Hyper-V code to be built on ARM64

arch/arm64/Kbuild | 1 +
arch/arm64/hyperv/Makefile | 2 +
arch/arm64/hyperv/hv_core.c | 418 +++++++++++++++++++++++++++++++++++
arch/arm64/hyperv/mshyperv.c | 165 ++++++++++++++
arch/arm64/include/asm/hyperv-tlfs.h | 413 ++++++++++++++++++++++++++++++++++
arch/arm64/include/asm/mshyperv.h | 115 ++++++++++
arch/arm64/kernel/efi.c | 1 +
arch/x86/include/asm/mshyperv.h | 4 +
drivers/hv/Kconfig | 3 +-
drivers/hv/hv.c | 3 +
include/asm-generic/mshyperv.h | 5 +
include/linux/arm-smccc.h | 1 +
13 files changed, 1133 insertions(+), 1 deletion(-)
create mode 100644 arch/arm64/hyperv/Makefile
create mode 100644 arch/arm64/hyperv/hv_core.c
create mode 100644 arch/arm64/hyperv/mshyperv.c
create mode 100644 arch/arm64/include/asm/hyperv-tlfs.h
create mode 100644 arch/arm64/include/asm/mshyperv.h


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