Re: [RFC PATCH 08/11] KVM: x86: Let moving encryption context be configurable

[Paolo Bonzini]

On 8/8/23 01:01, Ackerley Tng wrote:
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 75d48379d94d..a1a28dd77b94 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6351,7 +6351,14 @@ static int kvm_vm_move_enc_context_from(struct kvm *kvm, unsigned int source_fd)
>   	if (r)
>   		goto out_mark_migration_done;
>   
> -	r = static_call(kvm_x86_vm_move_enc_context_from)(kvm, source_kvm);
> +	/*
> +	 * Different types of VMs will allow userspace to define if moving
> +	 * encryption context should be supported.
> +	 */
> +	if (kvm->arch.vm_move_enc_ctxt_supported &&
> +	    kvm_x86_ops.vm_move_enc_context_from) {
> +		r = static_call(kvm_x86_vm_move_enc_context_from)(kvm, source_kvm);
> +	}

Rather than "supported" this is more "required".  So  perhaps 
kvm->arch.use_vm_enc_ctxt_op?

Paolo