Subject: Re: [PATCH 08/10] KVM: arm64: Use guard(spinlock) in psci.c

From: Jonathan Cameron <[email-masked]>
Date: Tue, 17 Mar 2026 17:54:17 +0000

On Mon, 16 Mar 2026 17:35:29 +0000
Fuad Tabba <[email-masked]> wrote:

> Migrate manual spin_lock() and spin_unlock() calls managing
> the vcpu->arch.mp_state_lock to use the guard(spinlock) macro.
> 
> This eliminates manual unlock calls on return paths and simplifies
> error handling during PSCI calls by replacing unlock goto labels
> with direct returns.
> 
> Change-Id: Iaf72da18b18aaec8edff91bc30379bed9dd04b2b
> Signed-off-by: Fuad Tabba <[email-masked]>

> @@ -176,9 +172,8 @@ static void kvm_prepare_system_event(struct kvm_vcpu *vcpu, u32 type, u64 flags)
>  	 * re-initialized.
>  	 */
>  	kvm_for_each_vcpu(i, tmp, vcpu->kvm) {
> -		spin_lock(&tmp->arch.mp_state_lock);
> -		WRITE_ONCE(tmp->arch.mp_state.mp_state, KVM_MP_STATE_STOPPED);
> -		spin_unlock(&tmp->arch.mp_state_lock);
> +		scoped_guard(spinlock, &tmp->arch.mp_state_lock)
No benefit over guard() and causes more churn.

> +			WRITE_ONCE(tmp->arch.mp_state.mp_state, KVM_MP_STATE_STOPPED);
>  	}
>  	kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
>  
>