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| author | Paolo Bonzini <pbonzini@redhat.com> | 2015-07-29 12:05:37 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-10-01 15:06:25 +0200 |
| commit | 35754c987f252e859bfa390a6816e85563afe79d (patch) | |
| tree | cfb0a2d85738ea20b4421a13c2c5a8313b65f69d /arch/x86/kvm/irq.h | |
| parent | d50ab6c1a2b24e12d3012d7beb343eba5b94a6ca (diff) | |
| download | linux-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.h | 8 |
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); |