From: Alexander Graf <agraf@suse.de>
Date: Wed, 8 Aug 2012 18:31:13 +0000 (+0200)
Subject: KVM: PPC: BookE: Add check_requests helper function
X-Git-Tag: v3.8-rc1~121^2~56^2~41
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4ffc6356ec690f77f65b7b78e0047a3fe8316371;p=platform%2Fupstream%2Fkernel-adaptation-pc.git

KVM: PPC: BookE: Add check_requests helper function

We need a central place to check for pending requests in. Add one that
only does the timer check we already do in a different place.

Later, this central function can be extended by more checks.

Signed-off-by: Alexander Graf <agraf@suse.de>
---

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 1d4ce9a..bcf87fe 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -419,13 +419,6 @@ static void kvmppc_core_check_exceptions(struct kvm_vcpu *vcpu)
 	unsigned long *pending = &vcpu->arch.pending_exceptions;
 	unsigned int priority;
 
-	if (vcpu->requests) {
-		if (kvm_check_request(KVM_REQ_PENDING_TIMER, vcpu)) {
-			smp_mb();
-			update_timer_ints(vcpu);
-		}
-	}
-
 	priority = __ffs(*pending);
 	while (priority < BOOKE_IRQPRIO_MAX) {
 		if (kvmppc_booke_irqprio_deliver(vcpu, priority))
@@ -461,6 +454,14 @@ int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
 	return r;
 }
 
+static void kvmppc_check_requests(struct kvm_vcpu *vcpu)
+{
+	if (vcpu->requests) {
+		if (kvm_check_request(KVM_REQ_PENDING_TIMER, vcpu))
+			update_timer_ints(vcpu);
+	}
+}
+
 /*
  * Common checks before entering the guest world.  Call with interrupts
  * disabled.
@@ -485,6 +486,15 @@ static int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
 			break;
 		}
 
+		smp_mb();
+		if (vcpu->requests) {
+			/* Make sure we process requests preemptable */
+			local_irq_enable();
+			kvmppc_check_requests(vcpu);
+			local_irq_disable();
+			continue;
+		}
+
 		if (kvmppc_core_prepare_to_enter(vcpu)) {
 			/* interrupts got enabled in between, so we
 			   are back at square 1 */