linux-kernel - Re: [PATCH v12 5/5] Drivers: hv: Enable Hyper-V code to be built on ARM64

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Date:   Wed, 4 Aug 2021 16:40:29 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Michael Kelley <mikelley@...rosoft.com>, will@...nel.org,
        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 v12 5/5] Drivers: hv: Enable Hyper-V code to be built on
 ARM64

On Wed, Aug 04, 2021 at 05:10:41PM +0100, Catalin Marinas wrote:
> On Wed, Aug 04, 2021 at 08:52:39AM -0700, Michael Kelley wrote:
> > Update drivers/hv/Kconfig so CONFIG_HYPERV can be selected on
> > ARM64, causing the Hyper-V specific code to be built. Exclude the
> > Hyper-V enlightened clocks/timers code from being built for ARM64.
> > 
> > Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
> > Reviewed-by: Boqun Feng <boqun.feng@...il.com>
> > Acked-by: Marc Zyngier <maz@...nel.org>
> > Acked-by: Mark Rutland <mark.rutland@....com>
> > 
> > ---
> >  drivers/hv/Kconfig | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
> > index 66c794d..e509d5d 100644
> > --- a/drivers/hv/Kconfig
> > +++ b/drivers/hv/Kconfig
> > @@ -4,7 +4,8 @@ menu "Microsoft Hyper-V guest support"
> >  
> >  config HYPERV
> >  	tristate "Microsoft Hyper-V client drivers"
> > -	depends on X86 && ACPI && X86_LOCAL_APIC && HYPERVISOR_GUEST
> > +	depends on ACPI && ((X86 && X86_LOCAL_APIC && HYPERVISOR_GUEST) \
> > +		|| (ARM64 && !CPU_BIG_ENDIAN))
> >  	select PARAVIRT
> >  	select X86_HV_CALLBACK_VECTOR
> 
> Does this need to be:
> 
> 	select X86_HV_CALLBACK_VECTOR if X86
> 
> I haven't checked whether it gives a warning on arm64 but that symbol
> doesn't exist.
> 
> Anyway, I can fix it up locally.

I can fix it up while I queue these patches.

Wei.