linux-kernel - Re: [PATCH v3 10/32] KVM: arm64: Introduce an early Hyp page allocator

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Date:   Thu, 4 Mar 2021 14:38:25 +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 10/32] KVM: arm64: Introduce an early Hyp page
 allocator

On Tue, Mar 02, 2021 at 02:59:40PM +0000, Quentin Perret wrote:
> With nVHE, the host currently creates all stage 1 hypervisor mappings at
> EL1 during boot, installs them at EL2, and extends them as required
> (e.g. when creating a new VM). But in a world where the host is no
> longer trusted, it cannot have full control over the code mapped in the
> hypervisor.
> 
> In preparation for enabling the hypervisor to create its own stage 1
> mappings during boot, introduce an early page allocator, with minimal
> functionality. This allocator is designed to be used only during early
> bootstrap of the hyp code when memory protection is enabled, which will
> then switch to using a full-fledged page allocator after init.
> 
> Signed-off-by: Quentin Perret <qperret@...gle.com>
> ---
>  arch/arm64/kvm/hyp/include/nvhe/early_alloc.h | 14 +++++
>  arch/arm64/kvm/hyp/include/nvhe/memory.h      | 24 +++++++++
>  arch/arm64/kvm/hyp/nvhe/Makefile              |  2 +-
>  arch/arm64/kvm/hyp/nvhe/early_alloc.c         | 54 +++++++++++++++++++
>  arch/arm64/kvm/hyp/nvhe/psci-relay.c          |  4 +-
>  5 files changed, 94 insertions(+), 4 deletions(-)
>  create mode 100644 arch/arm64/kvm/hyp/include/nvhe/early_alloc.h
>  create mode 100644 arch/arm64/kvm/hyp/include/nvhe/memory.h
>  create mode 100644 arch/arm64/kvm/hyp/nvhe/early_alloc.c

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

Will