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

[Will Deacon]

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 at google.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 at kernel.org>

Will