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KVM: round robin for APIC lowest priority delivery mode

Browse source 
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
He, Qing 2007-09-03 17:01:36 +03:00 committed by Avi Kivity
parent 40487c680d
commit 932f72adbe
2 changed files with 29 additions and 5 deletions
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1
drivers/kvm/kvm.h
View file

@ -413,6 +413,7 @@ struct kvm {
struct kvm_io_bus pio_bus;
struct kvm_pic *vpic;
struct kvm_ioapic *vioapic;
int round_robin_prev_vcpu;
};
static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)

33
drivers/kvm/lapic.c
View file

@ -371,12 +371,35 @@ struct kvm_lapic *kvm_apic_round_robin(struct kvm *kvm, u8 vector,
unsigned long bitmap)
{
int vcpu_id;
int last;
int next;
struct kvm_lapic *apic;
/* TODO for real round robin */
vcpu_id = fls(bitmap) - 1;
if (vcpu_id < 0)
printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
return kvm->vcpus[vcpu_id]->apic;
last = kvm->round_robin_prev_vcpu;
next = last;
do {
if (++next == KVM_MAX_VCPUS)
next = 0;
if (kvm->vcpus[next] == NULL || !test_bit(next, &bitmap))
continue;
apic = kvm->vcpus[next]->apic;
if (apic && apic_enabled(apic))
break;
apic = NULL;
} while (next != last);
kvm->round_robin_prev_vcpu = next;
if (!apic) {
vcpu_id = ffs(bitmap) - 1;
if (vcpu_id < 0) {
vcpu_id = 0;
printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
}
apic = kvm->vcpus[vcpu_id]->apic;
}
return apic;
}
static void apic_set_eoi(struct kvm_lapic *apic)