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

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Message-ID: <20210804161040.GC4857@arm.com>
Date:   Wed, 4 Aug 2021 17:10:41 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     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 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.

As an additional patch (it can be done later, once this goes upstream) I
think we should replace the depends on with a single ARCH_HAS_HYPERV.

-- 
Catalin