linux-kernel - Re: [PATCH v11 0/5] Enable Linux guests on Hyper-V on ARM64

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Message-ID: <87k0l325vl.wl-maz@kernel.org>
Date:   Mon, 02 Aug 2021 17:01:02 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     will@...nel.org, catalin.marinas@....com, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-efi@...r.kernel.org,
        wei.liu@...nel.org, kys@...rosoft.com, sthemmin@...rosoft.com,
        ardb@...nel.org
Subject: Re: [PATCH v11 0/5] Enable Linux guests on Hyper-V on ARM64

On Tue, 20 Jul 2021 15:56:58 +0100,
Michael Kelley <mikelley@...rosoft.com> wrote:
> 
> This series enables Linux guests running on Hyper-V on ARM64
> hardware. New ARM64-specific code in arch/arm64/hyperv initializes
> Hyper-V and its 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) Add definitions and functions for making Hyper-V hypercalls
>    and getting/setting virtual processor registers provided by
>    Hyper-V
> 
> 2) Add the function needed by the arch independent VMbus driver
>    for reporting a panic to Hyper-V.
> 
> 3) Add Hyper-V initialization code and utility functions that
>    report Hyper-v status.
> 
> 4) Export screen_info so it may be used by the Hyper-V frame buffer
>    driver built as a module. It is already exported for x86,
>    powerpc, and alpha architectures.
> 
> 5) Make CONFIG_HYPERV selectable on ARM64 in addition to x86/x64.
> 
> Hyper-V on ARM64 runs with a 4 Kbyte page size, but allows guests
> with 4K/16K/64K page size. Linux guests with this patch series
> work with all three supported ARM64 page sizes.
> 
> The Hyper-V vPCI driver at drivers/pci/host/pci-hyperv.c has
> x86/x64-specific code and is not being built for ARM64. Enabling
> Hyper-V vPCI devices on ARM64 is in progress via a separate set
> of patches.
> 
> This patch set is based on the linux-next20210720 code tree.
> 
> Changes in v11:
> * Drop the previous Patch 1 as the fixes have already been
>   separately accepted upstream.
> * Drop the previous Patch 3 for enabling Hyper-V enlightened
>   clocks/timers.  Hyper-V is now offering the full ARM64
>   architectural Generic Timer in guest VMs, so the existing
>   arch_arch_timer.c driver just works. [Mark Rutland, Marc
>   Zyngier]

Thanks for doing this. Assuming you fix the issue I mentioned in my
reply to patch #3. FWIW:

Acked-by: Marc Zyngier <maz@...nel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.