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

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Date:   Mon, 2 Aug 2021 17:28:56 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Michael Kelley <mikelley@...rosoft.com>, will@...nel.org,
        catalin.marinas@....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 Mon, Aug 02, 2021 at 05:01:02PM +0100, Marc Zyngier wrote:
> 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>

I've tried to provide concrete options for those. With those fixed up
somehow:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.