[PATCH v2 08/13] KVM: arm64: Guest exit handlers for nVHE hyp

[Will Deacon]

On Tue, Jun 15, 2021 at 02:39:45PM +0100, Fuad Tabba wrote:
> Add an array of pointers to handlers for various trap reasons in
> nVHE code.
> 
> The current code selects how to fixup a guest on exit based on a
> series of if/else statements. Future patches will also require
> different handling for guest exists. Create an array of handlers
> to consolidate them.
> 
> No functional change intended as the array isn't populated yet.
> 
> Signed-off-by: Fuad Tabba <tabba at google.com>
> ---
>  arch/arm64/kvm/hyp/include/hyp/switch.h | 19 ++++++++++++++
>  arch/arm64/kvm/hyp/nvhe/switch.c        | 35 +++++++++++++++++++++++++
>  2 files changed, 54 insertions(+)
> 
> diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
> index e4a2f295a394..f5d3d1da0aec 100644
> --- a/arch/arm64/kvm/hyp/include/hyp/switch.h
> +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
> @@ -405,6 +405,18 @@ static inline bool __hyp_handle_ptrauth(struct kvm_vcpu *vcpu)
>  	return true;
>  }
>  
> +typedef int (*exit_handle_fn)(struct kvm_vcpu *);
> +
> +exit_handle_fn kvm_get_nvhe_exit_handler(struct kvm_vcpu *vcpu);
> +
> +static exit_handle_fn kvm_get_hyp_exit_handler(struct kvm_vcpu *vcpu)
> +{
> +	if (is_nvhe_hyp_code())
> +		return kvm_get_nvhe_exit_handler(vcpu);
> +	else
> +		return NULL;
> +}

nit: might be a bit tidier with a ternary if (?:).

But either way:

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

Will