Re: [PATCH 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set

[Peter Zijlstra]

On Mon, Oct 23, 2017 at 05:44:27PM -0700, Eduardo Valentin wrote:
> @@ -46,6 +48,8 @@ static inline bool virt_spin_lock(struct qspinlock *lock)
>  	if (!static_cpu_has(X86_FEATURE_HYPERVISOR))
>  		return false;
>  
> +	if (kvm_para_has_feature(KVM_FEATURE_PV_DEDICATED))
> +		return false;
>  	/*
>  	 * On hypervisors without PARAVIRT_SPINLOCKS support we fall
>  	 * back to a Test-and-Set spinlock, because fair locks have

This does not apply. Much has been changed here recently.