linux-kernel - Re: [PATCH v12 0/5] Enable Linux guests on Hyper-V on ARM64

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Message-ID: <20210804164358.GE4857@arm.com>
Date:   Wed, 4 Aug 2021 17:43:58 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     "will@...nel.org" <will@...nel.org>,
        Mark Rutland <Mark.Rutland@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "ardb@...nel.org" <ardb@...nel.org>
Subject: Re: [PATCH v12 0/5] Enable Linux guests on Hyper-V on ARM64

On Wed, Aug 04, 2021 at 04:39:02PM +0000, Michael Kelley wrote:
> From: Catalin Marinas <catalin.marinas@....com> Sent: Wednesday, August 4, 2021 9:26 AM
> > 
> > On Wed, Aug 04, 2021 at 08:52:34AM -0700, Michael Kelley 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.
> > [...]
> > > 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.
> > 
> > Is it possible to rebase this on top of -rc3? Are there any
> > dependencies or do you plan to upstream this via a different tree?
> 
> There are dependencies on changes in the hyperv-next tree
> (https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/)
> which is why you are getting the build errors.  The changes
> common-ized some code between the x86 side and previous
> versions of this patch set (and fixed the #include nmi.h problem). 
> So the code would most naturally go upstream through that tree.

In that case, for this series:

Acked-by: Catalin Marinas <catalin.marinas@....com>

I don't think there'd be conflicts with the arm64 changes but we can
spot them early in -next.

-- 
Catalin