linux-kernel - Re: [RFC PATCH v2 08/26] KVM: arm64: Make kvm_call

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Message-ID: <20210201184139.GG15632@willie-the-truck>
Date:   Mon, 1 Feb 2021 18:41:39 +0000
From:   Will Deacon <will@...nel.org>
To:     Quentin Perret <qperret@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, android-kvm@...gle.com,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        Fuad Tabba <tabba@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        David Brazdil <dbrazdil@...gle.com>
Subject: Re: [RFC PATCH v2 08/26] KVM: arm64: Make kvm_call_hyp() a function
 call at Hyp

On Fri, Jan 08, 2021 at 12:15:06PM +0000, Quentin Perret wrote:
> kvm_call_hyp() has some logic to issue a function call or a hypercall
> depending the EL at which the kernel is running. However, all the code
> compiled under __KVM_NVHE_HYPERVISOR__ is guaranteed to run only at EL2,
> and in this case a simple function call is needed.
> 
> Add ifdefery to kvm_host.h to symplify kvm_call_hyp() in .hyp.text.
> 
> Signed-off-by: Quentin Perret <qperret@...gle.com>
> ---
>  arch/arm64/include/asm/kvm_host.h | 6 ++++++
>  1 file changed, 6 insertions(+)

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

Will