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authorPaolo Bonzini <pbonzini@redhat.com>2015-07-29 12:05:37 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2015-10-01 15:06:25 +0200
commit35754c987f252e859bfa390a6816e85563afe79d (patch)
treecfb0a2d85738ea20b4421a13c2c5a8313b65f69d /arch/x86/kvm/irq.h
parentd50ab6c1a2b24e12d3012d7beb343eba5b94a6ca (diff)
downloadlinux-35754c987f252e859bfa390a6816e85563afe79d.tar.bz2
KVM: x86: introduce lapic_in_kernel
Avoid pointer chasing and memory barriers, and simplify the code when split irqchip (LAPIC in kernel, IOAPIC/PIC in userspace) is introduced. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/irq.h')
-rw-r--r--arch/x86/kvm/irq.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h
index 3d782a2c336a..9e6e7e04de98 100644
--- a/arch/x86/kvm/irq.h
+++ b/arch/x86/kvm/irq.h
@@ -92,6 +92,14 @@ static inline int irqchip_in_kernel(struct kvm *kvm)
return vpic != NULL;
}
+static inline int lapic_in_kernel(struct kvm_vcpu *vcpu)
+{
+ /* Same as irqchip_in_kernel(vcpu->kvm), but with less
+ * pointer chasing and no unnecessary memory barriers.
+ */
+ return vcpu->arch.apic != NULL;
+}
+
void kvm_pic_reset(struct kvm_kpic_state *s);
void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);