[PATCH 06/10] KVM: arm64: Map SVE context at EL2 when available

[Will Deacon]

On Tue, Mar 16, 2021 at 10:13:08AM +0000, Marc Zyngier wrote:
> When running on nVHE, and that the vcpu supports SVE, map the
> SVE state at EL2 so that KVM can access it.
> 
> Signed-off-by: Marc Zyngier <maz at kernel.org>
> ---
>  arch/arm64/kvm/fpsimd.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/arch/arm64/kvm/fpsimd.c b/arch/arm64/kvm/fpsimd.c
> index b7e36a506d3d..84afca5ed6f2 100644
> --- a/arch/arm64/kvm/fpsimd.c
> +++ b/arch/arm64/kvm/fpsimd.c
> @@ -43,6 +43,17 @@ int kvm_arch_vcpu_run_map_fp(struct kvm_vcpu *vcpu)
>  	if (ret)
>  		goto error;
>  
> +	if (vcpu->arch.sve_state) {
> +		void *sve_end;
> +
> +		sve_end = vcpu->arch.sve_state + vcpu_sve_state_size(vcpu) + 1;

Why do you need the '+ 1' here?

Will