Re: [PATCH] selftests: KVM: aarch64: Let hypercalls use UAPI *_BIT_COUNT

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

On 5/5/22 14:04, Marc Zyngier wrote:
> diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
> index e523bb6eac67..3cde9f958eee 100644
> --- a/arch/arm64/include/uapi/asm/kvm.h
> +++ b/arch/arm64/include/uapi/asm/kvm.h
> @@ -342,6 +342,10 @@ struct kvm_arm_copy_mte_tags {
>   
>   enum {
>   	KVM_REG_ARM_STD_BIT_TRNG_V1_0	= 0,
> +	/*
> +	 * KVM_REG_ARM_STD_BMAP_BIT_COUNT will vary as new services
> +	 * are added, and is explicitely not part of the ABI.
> +	 */
>   	KVM_REG_ARM_STD_BMAP_BIT_COUNT,
>   };

That seems like a bad idea.  Perhaps you can wrap it in #ifdef 
__KERNEL_OR_SELFTESTS__?  I can't find any prior art.

Paolo