Re: [PATCH mm-unstable v2 09/10] kvm/x86: add kvm_arch_test_clear_young()

[Paolo Bonzini]

On 5/27/23 01:44, Yu Zhao wrote:
> +#define kvm_arch_has_test_clear_young kvm_arch_has_test_clear_young
> +static inline bool kvm_arch_has_test_clear_young(void)
> +{
> +	return IS_ENABLED(CONFIG_X86_64) &&
> +	       (!IS_REACHABLE(CONFIG_KVM) || (tdp_mmu_enabled && shadow_accessed_mask));
> +}

I don't think you need IS_REACHABLE(CONFIG_KVM) here, it would be a bug 
if this is called from outside KVM code.

Maybe make it a BUILD_BUG_ON?

Paolo