linux-kernel - Re: [PATCH 2/2] KVM: arm64: Depend on HAVE

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Message-ID: <20210929155328.GD22029@willie-the-truck>
Date:   Wed, 29 Sep 2021 16:53:29 +0100
From:   Will Deacon <will@...nel.org>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] KVM: arm64: Depend on HAVE_KVM => OF instead of
 directly on OF

On Tue, Sep 21, 2021 at 03:22:31PM -0700, Sean Christopherson wrote:
> Select HAVE_KVM if the KVM dependency is met (OF / Open Firmware), and
> make KVM depend on HAVE_KVM instead of directly on OF.  This fixes the
> oddity where arm64 configs can end up with KVM=y and HAVE_KVM=n, and will
> hopefully prevent breakage if there are future users of HAVE_KVM.
> 
> Note, arm64 unconditionally selects OF, and has always done so (see
> commit 8c2c3df31e3b ("arm64: Build infrastructure").  Keep the somewhat
> pointless HAVE_KVM dependency on OF to document that KVM requires Open
> Firmware support.
> 
> No functional change intended.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/arm64/Kconfig     | 1 +
>  arch/arm64/kvm/Kconfig | 2 +-
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index b5b13a932561..38c0f36a5ed4 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -187,6 +187,7 @@ config ARM64
>  	select HAVE_GCC_PLUGINS
>  	select HAVE_HW_BREAKPOINT if PERF_EVENTS
>  	select HAVE_IRQ_TIME_ACCOUNTING
> +	select HAVE_KVM if OF

Honestly, I'd just drop the 'if OF' here. We select it unconditionally a
few lines below and so I think it's more confusing to have the check.

With that:

Acked-by: Will Deacon <will@...nel.org>

Will