linux-kernel - Re: [PATCH v4 04/10] kvm: arm64: Remove __hyp_this_cpu

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Message-ID: <20200929173053.GB14317@willie-the-truck>
Date:   Tue, 29 Sep 2020 18:30:53 +0100
From:   Will Deacon <will@...nel.org>
To:     David Brazdil <dbrazdil@...gle.com>
Cc:     kvmarm@...ts.cs.columbia.edu,
        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>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, Andrew Scull <ascull@...gle.com>
Subject: Re: [PATCH v4 04/10] kvm: arm64: Remove __hyp_this_cpu_read

On Tue, Sep 22, 2020 at 09:49:04PM +0100, David Brazdil wrote:
> this_cpu_ptr is meant for use in kernel proper because it selects between
> TPIDR_EL1/2 based on nVHE/VHE. __hyp_this_cpu_ptr was used in hyp to always
> select TPIDR_EL2. Unify all users behind this_cpu_ptr and friends by
> selecting _EL2 register under __KVM_NVHE_HYPERVISOR__. VHE continues
> selecting the register using alternatives.
> 
> Under CONFIG_DEBUG_PREEMPT, the kernel helpers perform a preemption check
> which is omitted by the hyp helpers. Preserve the behavior for nVHE by
> overriding the corresponding macros under __KVM_NVHE_HYPERVISOR__. Extend
> the checks into VHE hyp code.
> 
> Acked-by: Andrew Scull <ascull@...gle.com>
> Signed-off-by: David Brazdil <dbrazdil@...gle.com>
> ---
>  arch/arm64/include/asm/kvm_asm.h          | 20 ----------------
>  arch/arm64/include/asm/percpu.h           | 28 +++++++++++++++++++++--
>  arch/arm64/kvm/hyp/include/hyp/debug-sr.h |  4 ++--
>  arch/arm64/kvm/hyp/include/hyp/switch.h   |  8 +++----
>  arch/arm64/kvm/hyp/nvhe/switch.c          |  2 +-
>  arch/arm64/kvm/hyp/vhe/switch.c           |  2 +-
>  arch/arm64/kvm/hyp/vhe/sysreg-sr.c        |  4 ++--
>  7 files changed, 36 insertions(+), 32 deletions(-)

Looks good, thanks for the respin!

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

Will