linux-kernel - Re: [PATCH v4 34/34] KVM: arm64: Protect the .hyp sections from the host

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Date:   Thu, 11 Mar 2021 19:17:17 +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, ardb@...nel.org
Subject: Re: [PATCH v4 34/34] KVM: arm64: Protect the .hyp sections from the
 host

On Wed, Mar 10, 2021 at 05:57:51PM +0000, Quentin Perret wrote:
> When KVM runs in nVHE protected mode, use the host stage 2 to unmap the
> hypervisor sections by marking them as owned by the hypervisor itself.
> The long-term goal is to ensure the EL2 code can remain robust
> regardless of the host's state, so this starts by making sure the host
> cannot e.g. write to the .hyp sections directly.
> 
> Signed-off-by: Quentin Perret <qperret@...gle.com>
> ---
>  arch/arm64/include/asm/kvm_asm.h              |  1 +
>  arch/arm64/kvm/arm.c                          | 46 +++++++++++++++++++
>  arch/arm64/kvm/hyp/include/nvhe/mem_protect.h |  2 +
>  arch/arm64/kvm/hyp/nvhe/hyp-main.c            |  9 ++++
>  arch/arm64/kvm/hyp/nvhe/mem_protect.c         | 33 +++++++++++++
>  5 files changed, 91 insertions(+)

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

Will