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 (file)
--- 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 */