linux-kernel - Re: [PATCH v6 14/38] KVM: arm64: Provide __flush_dcache

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Date:   Mon, 22 Mar 2021 11:25:53 +0000
From:   Will Deacon <will@...nel.org>
To:     Quentin Perret <qperret@...gle.com>
Cc:     catalin.marinas@....com, maz@...nel.org, james.morse@....com,
        julien.thierry.kdev@...il.com, suzuki.poulose@....com,
        android-kvm@...gle.com, seanjc@...gle.com, mate.toth-pal@....com,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org, kernel-team@...roid.com,
        kvmarm@...ts.cs.columbia.edu, tabba@...gle.com, ardb@...nel.org,
        mark.rutland@....com, dbrazdil@...gle.com
Subject: Re: [PATCH v6 14/38] KVM: arm64: Provide __flush_dcache_area at EL2

On Fri, Mar 19, 2021 at 10:01:22AM +0000, Quentin Perret wrote:
> We will need to do cache maintenance at EL2 soon, so compile a copy of
> __flush_dcache_area at EL2, and provide a copy of arm64_ftr_reg_ctrel0
> as it is needed by the read_ctr macro.
> 
> Signed-off-by: Quentin Perret <qperret@...gle.com>
> ---
>  arch/arm64/include/asm/kvm_cpufeature.h |  2 ++
>  arch/arm64/kvm/hyp/nvhe/Makefile        |  3 ++-
>  arch/arm64/kvm/hyp/nvhe/cache.S         | 13 +++++++++++++
>  arch/arm64/kvm/hyp/nvhe/hyp-smp.c       |  6 ++++++
>  arch/arm64/kvm/sys_regs.c               |  1 +
>  5 files changed, 24 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm64/kvm/hyp/nvhe/cache.S

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

Will