Messages in this thread | | | From | Michael Kelley <> | Subject | [PATCH 0/5] Enable Linux guests on Hyper-V on ARM64 | Date | Tue, 19 Jun 2018 14:23:10 -0700 |
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This patch series enables Linux guests running on Hyper-V on ARM64 hardware. New ARM64-specific code in arch/arm64/hyperv initializes Hyper-V, including its synthetic clocks 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 five patches are organized as follows: 1) Implement slow_virt_to_phys() function for ARM64. This function parallels the same function for x86/x64, and is used by the Hyper-V synthetic network driver.
2) 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.
3) Add core Hyper-V support on ARM64, including hypercalls, synthetic clock initialization, and interrupt handlers.
4) Update the existing VMbus driver to generalize interrupt management across x86/x64 and ARM64.
5) Make CONFIG_HYPERV selectable on ARM64 in addition to x86/x64.
Some areas of Linux guests on Hyper-V on ARM64 are a work- in-progress, primarily due to work still being done in Hyper-V:
* Hyper-V on ARM64 currently runs with a 4 Kbyte page size, and only supports guests with a 4 Kbyte page size. Because Hyper-V uses shared pages to communicate between the guest and the hypervisor, there are open design decisions on the page size to use when the guest is using 16K/64K pages. Once those issues are resolved and Hyper-V fully supports 16K/64K guest pages, changes may be needed in the Linux drivers for Hyper-V synthetic devices.
* Hyper-V on ARM64 does not currently support mapping PCI devices into the guest address space. The Hyper-V PCI driver at drivers/pci/host/pci-hyperv.c has x86/x64-specific code and is not being built for ARM64.
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.
Michael Kelley (5): arm64: mm: Add slow_virt_to_phys() arm64: hyperv: Add core Hyper-V include files arm64: hyperv: Add support for Hyper-V as a hypervisor Drivers: hv: vmbus: Add hooks for per-CPU IRQ Drivers: hv: Enable CONFIG_HYPERV on ARM64
MAINTAINERS | 3 + arch/arm64/Makefile | 1 + arch/arm64/hyperv/Makefile | 2 + arch/arm64/hyperv/hv_hvc.S | 54 +++++ arch/arm64/hyperv/hv_init.c | 411 +++++++++++++++++++++++++++++++++++ arch/arm64/hyperv/mshyperv.c | 178 +++++++++++++++ arch/arm64/include/asm/hyperv-tlfs.h | 353 ++++++++++++++++++++++++++++++ arch/arm64/include/asm/memory.h | 6 + arch/arm64/include/asm/mshyperv.h | 291 +++++++++++++++++++++++++ arch/arm64/mm/pageattr.c | 37 ++++ arch/x86/include/asm/mshyperv.h | 4 + drivers/hv/Kconfig | 3 +- drivers/hv/hv.c | 2 + 13 files changed, 1344 insertions(+), 1 deletion(-) create mode 100644 arch/arm64/hyperv/Makefile create mode 100644 arch/arm64/hyperv/hv_hvc.S create mode 100644 arch/arm64/hyperv/hv_init.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
-- 1.8.3.1
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