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authorGleb Natapov <gleb@redhat.com>2009-03-05 16:34:59 +0200
committerAvi Kivity <avi@redhat.com>2009-06-10 11:48:27 +0300
commite1035715ef8d3171e29f9c6aee6f40d57b3fead5 (patch)
tree1ead65420a4d1653692d0e4b66a4e4f7fcbef425 /virt/kvm/irq_comm.c
parent343f94fe4d16ec898da77720c03da9e09f8523d2 (diff)
downloadlinux-e1035715ef8d3171e29f9c6aee6f40d57b3fead5.tar.bz2
KVM: change the way how lowest priority vcpu is calculated
The new way does not require additional loop over vcpus to calculate the one with lowest priority as one is chosen during delivery bitmap construction. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt/kvm/irq_comm.c')
-rw-r--r--virt/kvm/irq_comm.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index e43701c0a5c4..f5e059b67cd4 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -47,7 +47,7 @@ void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
int dest_id, int dest_mode, bool low_prio, int short_hand,
unsigned long *deliver_bitmask)
{
- int i;
+ int i, lowest = -1;
struct kvm_vcpu *vcpu;
if (dest_mode == 0 && dest_id == 0xff && low_prio)
@@ -64,15 +64,18 @@ void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
dest_mode))
continue;
- __set_bit(i, deliver_bitmask);
+ if (!low_prio) {
+ __set_bit(i, deliver_bitmask);
+ } else {
+ if (lowest < 0)
+ lowest = i;
+ if (kvm_apic_compare_prio(vcpu, kvm->vcpus[lowest]) < 0)
+ lowest = i;
+ }
}
- if (low_prio) {
- vcpu = kvm_get_lowest_prio_vcpu(kvm, 0, deliver_bitmask);
- bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
- if (vcpu)
- __set_bit(vcpu->vcpu_id, deliver_bitmask);
- }
+ if (lowest != -1)
+ __set_bit(lowest, deliver_bitmask);
}
static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,