linux-kernel - Re: [PATCH v3 31/32] KVM: arm64: Disable PMU support in protected mode

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Message-ID: <20210305190205.GA23633@willie-the-truck>
Date:   Fri, 5 Mar 2021 19:02:06 +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, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org, tabba@...gle.com,
        mark.rutland@....com, dbrazdil@...gle.com, mate.toth-pal@....com,
        seanjc@...gle.com, robh+dt@...nel.org
Subject: Re: [PATCH v3 31/32] KVM: arm64: Disable PMU support in protected
 mode

On Tue, Mar 02, 2021 at 03:00:01PM +0000, Quentin Perret wrote:
> The host currently writes directly in EL2 per-CPU data sections from
> the PMU code when running in nVHE. In preparation for unmapping the EL2
> sections from the host stage 2, disable PMU support in protected mode as
> we currently do not have a use-case for it.
> 
> Signed-off-by: Quentin Perret <qperret@...gle.com>
> ---
>  arch/arm64/kvm/perf.c | 3 ++-
>  arch/arm64/kvm/pmu.c  | 8 ++++----
>  2 files changed, 6 insertions(+), 5 deletions(-)

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

Will