[PATCH 0/4] Hyper-V: Enable Linux guests on Hyper-V on ARM64
kys at microsoft.com
Thu Nov 22 03:02:55 UTC 2018
> -----Original Message-----
> From: kys at linuxonhyperv.com <kys at linuxonhyperv.com>
> Sent: Wednesday, November 21, 2018 6:51 PM
> To: gregkh at linuxfoundation.org; linux-kernel at vger.kernel.org;
> devel at linuxdriverproject.org; olaf at aepfle.de; apw at canonical.com;
> jasowang at redhat.com; Stephen Hemminger <sthemmin at microsoft.com>;
> Michael Kelley <mikelley at microsoft.com>; vkuznets
> <vkuznets at redhat.com>
> Cc: KY Srinivasan <kys at microsoft.com>
> Subject: [PATCH 0/4] Hyper-V: Enable Linux guests on Hyper-V on ARM64
> From: "K. Y. Srinivasan" <kys at microsoft.com>
> 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 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 four 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 core Hyper-V support on ARM64, including hypercalls,
> synthetic clock initialization, and interrupt handlers.
> 3) Update the existing VMbus driver to generalize interrupt
> management across x86/x64 and ARM64.
> 4) 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 (4):
> 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 | 4 +
> arch/arm64/Makefile | 1 +
> arch/arm64/hyperv/Makefile | 2 +
> arch/arm64/hyperv/hv_hvc.S | 54 ++++
> arch/arm64/hyperv/hv_init.c | 441 +++++++++++++++++++++++++++
> arch/arm64/hyperv/mshyperv.c | 178 +++++++++++
> arch/arm64/include/asm/hyperv-tlfs.h | 338 ++++++++++++++++++++
> arch/arm64/include/asm/mshyperv.h | 116 +++++++
> arch/x86/include/asm/mshyperv.h | 4 +
> drivers/hv/Kconfig | 3 +-
> drivers/hv/hv.c | 2 +
> include/asm-generic/mshyperv.h | 240 +++++++++++++++
> 12 files changed, 1382 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
> create mode 100644 include/asm-generic/mshyperv.h
Please drop this. I will be resending shortly.
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