KVM: In-kernel I/O APIC model

This allows in-kernel host-side device drivers to raise guest interrupts
without going to userspace.

[avi: fix level-triggered interrupt redelivery on eoi]
[avi: add missing #include]
[avi: avoid redelivery of edge-triggered interrupt]
[avi: implement polarity]
[avi: don't deliver edge-triggered interrupts when unmasking]
[avi: fix host oops on invalid guest access]

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index a5790cb21ff..8d07a993af9 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -410,6 +410,7 @@ struct kvm {
 	struct kvm_io_bus mmio_bus;
 	struct kvm_io_bus pio_bus;
 	struct kvm_pic *vpic;
+	struct kvm_ioapic *vioapic;
 };
 
 static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
@@ -417,6 +418,11 @@ static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
 	return kvm->vpic;
 }
 
+static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
+{
+	return kvm->vioapic;
+}
+
 static inline int irqchip_in_kernel(struct kvm *kvm)
 {
 	return pic_irqchip(kvm) != 0;