KVM: vmx: speed up TPR below threshold vmexits

Since we're already in VCPU context, all we have to do here is recompute
the PPR value.  That will in turn generate a KVM_REQ_EVENT if necessary.

Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

3 files changed, 8 insertions, 1 deletions

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 7e9ac4606279..6b1d3a76c1d0 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -595,6 +595,12 @@ static void apic_update_ppr(struct kvm_lapic *apic)
         }
 }
 
+void kvm_apic_update_ppr(struct kvm_vcpu *vcpu)
+{
+        apic_update_ppr(vcpu->arch.apic);
+}
+EXPORT_SYMBOL_GPL(kvm_apic_update_ppr);
+
 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
 {
         kvm_lapic_set_reg(apic, APIC_TASKPRI, tpr);
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index cb16e6fd2330..5b5b1ba644cb 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -73,6 +73,7 @@ bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 
 void __kvm_apic_update_irr(u32 *pir, void *regs);
 void kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir);
+void kvm_apic_update_ppr(struct kvm_vcpu *vcpu);
 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
                      struct dest_map *dest_map);
 int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type);
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index d2fe3a51876c..94fda2010f5f 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6152,7 +6152,7 @@ static int handle_wrmsr(struct kvm_vcpu *vcpu)
 
 static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu)
 {
-        kvm_make_request(KVM_REQ_EVENT, vcpu);
+        kvm_apic_update_ppr(vcpu);
         return 1;
 }