[PATCH v6 13/38] KVM: arm64: Enable access to sanitized CPU features at EL2

[Will Deacon]

On Fri, Mar 19, 2021 at 10:01:21AM +0000, Quentin Perret wrote:
> Introduce the infrastructure in KVM enabling to copy CPU feature
> registers into EL2-owned data-structures, to allow reading sanitised
> values directly at EL2 in nVHE.
> 
> Given that only a subset of these features are being read by the
> hypervisor, the ones that need to be copied are to be listed under
> <asm/kvm_cpufeature.h> together with the name of the nVHE variable that
> will hold the copy. This introduces only the infrastructure enabling
> this copy. The first users will follow shortly.
> 
> Signed-off-by: Quentin Perret <qperret at google.com>
> ---
>  arch/arm64/include/asm/cpufeature.h     |  1 +
>  arch/arm64/include/asm/kvm_cpufeature.h | 22 ++++++++++++++++++++++
>  arch/arm64/include/asm/kvm_host.h       |  4 ++++
>  arch/arm64/kernel/cpufeature.c          | 13 +++++++++++++
>  arch/arm64/kvm/sys_regs.c               | 19 +++++++++++++++++++
>  5 files changed, 59 insertions(+)
>  create mode 100644 arch/arm64/include/asm/kvm_cpufeature.h

Acked-by: Will Deacon <will at kernel.org>

Will