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authorGleb Natapov <gleb@redhat.com>2009-08-24 11:54:25 +0300
committerAvi Kivity <avi@redhat.com>2009-12-03 09:32:08 +0200
commiteba0226bdfffe262e72b8360e4d0d12070e9a0f0 (patch)
tree93da785e3bba63a9232e529a2572541ef87c0615 /virt/kvm/irq_comm.c
parent280aa177dcd1edc718d8a92f17f235b783ec6307 (diff)
downloadlinaro-lsk-eba0226bdfffe262e72b8360e4d0d12070e9a0f0.tar.gz
KVM: Move IO APIC to its own lock
The allows removal of irq_lock from the injection path. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm/irq_comm.c')
-rw-r--r--virt/kvm/irq_comm.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 6c946141dbc..fadf4408a82 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -146,8 +146,8 @@ static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
*/
int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
{
- struct kvm_kernel_irq_routing_entry *e;
- int ret = -1;
+ struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
+ int ret = -1, i = 0;
struct kvm_irq_routing_table *irq_rt;
struct hlist_node *n;
@@ -162,14 +162,19 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
rcu_read_lock();
irq_rt = rcu_dereference(kvm->irq_routing);
if (irq < irq_rt->nr_rt_entries)
- hlist_for_each_entry(e, n, &irq_rt->map[irq], link) {
- int r = e->set(e, kvm, irq_source_id, level);
- if (r < 0)
- continue;
-
- ret = r + ((ret < 0) ? 0 : ret);
- }
+ hlist_for_each_entry(e, n, &irq_rt->map[irq], link)
+ irq_set[i++] = *e;
rcu_read_unlock();
+
+ while(i--) {
+ int r;
+ r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level);
+ if (r < 0)
+ continue;
+
+ ret = r + ((ret < 0) ? 0 : ret);
+ }
+
return ret;
}