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];
struct kvm_kernel_irq_routing_entry *rt_entries;
u32 nr_rt_entries;
/*
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index a9d2262..42994c4 100644
--- 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;
hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
if (kian->gsi == gsi)
@@ -308,6 +300,9 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
}
e->irqchip.irqchip = ue->u.irqchip.irqchip;
e->irqchip.pin = ue->u.irqchip.pin + delta;
+ if (e->irqchip.pin > KVM_IOAPIC_NUM_PINS)
+ goto out;
+ rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi;
break;
case KVM_IRQ_ROUTING_MSI:
e->set = kvm_set_msi;
@@ -332,7 +327,7 @@ int kvm_set_irq_routing(struct kvm *kvm,
unsigned flags)
{
struct kvm_irq_routing_table *new, *old;
- u32 i, nr_rt_entries = 0;
+ u32 i, j, nr_rt_entries = 0;
int r;
for (i = 0; i < nr; ++i) {
@@ -353,6 +348,9 @@ int kvm_set_irq_routing(struct kvm *kvm,
new->rt_entries = (void *)&new->map[nr_rt_entries];
new->nr_rt_entries = nr_rt_entries;
+ for (i = 0; i < 3; i++)
+ for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++)
+ new->chip[i][j] = -1;
for (i = 0; i < nr; ++i) {
r = -EINVAL;
--
1.6.3.3
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
