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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>
This commit is contained in:
Paolo Bonzini 2016-12-18 14:02:21 +01:00 committed by Radim Krčmář
parent 0f1e261ead
commit eb90f3417a
3 changed files with 8 additions and 1 deletions
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6
arch/x86/kvm/lapic.c
View File

@ -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);

1
arch/x86/kvm/lapic.h
View File

@ -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);

2
arch/x86/kvm/vmx.c
View File

@ -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;
}