KVM: PPC: Book3S HV P9: Tidy kvmppc_create_dtl_entry

This goes further to removing vcores from the P9 path. Also avoid the
memset in favour of explicitly initialising all fields.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-52-npiggin@gmail.com

arch/powerpc/kvm/book3s_hv.c

@@ -698,41 +698,30 @@ static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
 	return p;
 }
 
-static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
-				    struct kvmppc_vcore *vc, u64 tb)
+static void __kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
+					unsigned int pcpu, u64 now,
+					unsigned long stolen)
 {
 	struct dtl_entry *dt;
 	struct lppaca *vpa;
-	unsigned long stolen;
-	unsigned long core_stolen;
-	u64 now;
-	unsigned long flags;
 
 	dt = vcpu->arch.dtl_ptr;
 	vpa = vcpu->arch.vpa.pinned_addr;
-	now = tb;
-
-	if (cpu_has_feature(CPU_FTR_ARCH_300)) {
-		stolen = 0;
-	} else {
-		core_stolen = vcore_stolen_time(vc, now);
-		stolen = core_stolen - vcpu->arch.stolen_logged;
-		vcpu->arch.stolen_logged = core_stolen;
-		spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
-		stolen += vcpu->arch.busy_stolen;
-		vcpu->arch.busy_stolen = 0;
-		spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
-	}
 
 	if (!dt || !vpa)
 		return;
-	memset(dt, 0, sizeof(struct dtl_entry));
+
 	dt->dispatch_reason = 7;
-	dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
-	dt->timebase = cpu_to_be64(now + vc->tb_offset);
+	dt->preempt_reason = 0;
+	dt->processor_id = cpu_to_be16(pcpu + vcpu->arch.ptid);
 	dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
+	dt->ready_to_enqueue_time = 0;
+	dt->waiting_to_ready_time = 0;
+	dt->timebase = cpu_to_be64(now);
+	dt->fault_addr = 0;
 	dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
 	dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
+
 	++dt;
 	if (dt == vcpu->arch.dtl.pinned_end)
 		dt = vcpu->arch.dtl.pinned_addr;
@@ -743,6 +732,27 @@ static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
 	vcpu->arch.dtl.dirty = true;
 }
 
+static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
+				    struct kvmppc_vcore *vc)
+{
+	unsigned long stolen;
+	unsigned long core_stolen;
+	u64 now;
+	unsigned long flags;
+
+	now = mftb();
+
+	core_stolen = vcore_stolen_time(vc, now);
+	stolen = core_stolen - vcpu->arch.stolen_logged;
+	vcpu->arch.stolen_logged = core_stolen;
+	spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
+	stolen += vcpu->arch.busy_stolen;
+	vcpu->arch.busy_stolen = 0;
+	spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
+
+	__kvmppc_create_dtl_entry(vcpu, vc->pcpu, now + vc->tb_offset, stolen);
+}
+
 /* See if there is a doorbell interrupt pending for a vcpu */
 static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu)
 {
@@ -3756,7 +3766,7 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
 		pvc->pcpu = pcpu + thr;
 		for_each_runnable_thread(i, vcpu, pvc) {
 			kvmppc_start_thread(vcpu, pvc);
-			kvmppc_create_dtl_entry(vcpu, pvc, mftb());
+			kvmppc_create_dtl_entry(vcpu, pvc);
 			trace_kvm_guest_enter(vcpu);
 			if (!vcpu->arch.ptid)
 				thr0_done = true;
@@ -4332,7 +4342,7 @@ static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu)
 		if ((vc->vcore_state == VCORE_PIGGYBACK ||
 		     vc->vcore_state == VCORE_RUNNING) &&
 			   !VCORE_IS_EXITING(vc)) {
-			kvmppc_create_dtl_entry(vcpu, vc, mftb());
+			kvmppc_create_dtl_entry(vcpu, vc);
 			kvmppc_start_thread(vcpu, vc);
 			trace_kvm_guest_enter(vcpu);
 		} else if (vc->vcore_state == VCORE_SLEEPING) {
@@ -4510,7 +4520,7 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
 	local_paca->kvm_hstate.ptid = 0;
 	local_paca->kvm_hstate.fake_suspend = 0;
 
-	kvmppc_create_dtl_entry(vcpu, vc, tb);
+	__kvmppc_create_dtl_entry(vcpu, pcpu, tb + vc->tb_offset, 0);
 
 	trace_kvm_guest_enter(vcpu);