On 08/11/2009 03:31 PM, Gleb Natapov wrote:
Maintain back mapping from irqchip/pin to gsi to speedup
interrupt acknowledgment notifications.
Signed-off-by: Gleb Natapov<gleb@xxxxxxxxxx>
---
include/linux/kvm_host.h | 1 +
virt/kvm/irq_comm.c | 24 +++++++++++-------------
2 files changed, 12 insertions(+), 13 deletions(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 09df31d..d2b8eb3 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -133,6 +133,7 @@ struct kvm_kernel_irq_routing_entry {
};
struct kvm_irq_routing_table {
+ int chip[3][KVM_IOAPIC_NUM_PINS];
KVM_NR_IRQCHIPS
An alternative implementation is to embed a lookup table in each
irqchip. I don't think it's really necessary.
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -168,21 +168,13 @@ void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
{
struct kvm_irq_ack_notifier *kian;
struct hlist_node *n;
- unsigned gsi = pin;
- int i;
+ unsigned gsi;
trace_kvm_ack_irq(irqchip, pin);
- for (i = 0; i< kvm->irq_routing->nr_rt_entries; i++) {
- struct kvm_kernel_irq_routing_entry *e;
- e =&kvm->irq_routing->rt_entries[i];
- if (e->type == KVM_IRQ_ROUTING_IRQCHIP&&
- e->irqchip.irqchip == irqchip&&
- e->irqchip.pin == pin) {
- gsi = e->gsi;
- break;
- }
- }
+ gsi = kvm->irq_routing->chip[irqchip][pin];
+ if (gsi == -1)
+ gsi = pin;
What's this?
--
error compiling committee.c: too many arguments to function
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