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KVM: round robin for APIC lowest priority delivery mode
Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
parent
40487c680d
commit
932f72adbe
2 changed files with 29 additions and 5 deletions
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@ -413,6 +413,7 @@ struct kvm {
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struct kvm_io_bus pio_bus;
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struct kvm_pic *vpic;
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struct kvm_ioapic *vioapic;
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int round_robin_prev_vcpu;
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};
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static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
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@ -371,12 +371,35 @@ struct kvm_lapic *kvm_apic_round_robin(struct kvm *kvm, u8 vector,
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unsigned long bitmap)
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{
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int vcpu_id;
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int last;
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int next;
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struct kvm_lapic *apic;
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/* TODO for real round robin */
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vcpu_id = fls(bitmap) - 1;
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if (vcpu_id < 0)
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printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
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return kvm->vcpus[vcpu_id]->apic;
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last = kvm->round_robin_prev_vcpu;
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next = last;
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do {
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if (++next == KVM_MAX_VCPUS)
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next = 0;
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if (kvm->vcpus[next] == NULL || !test_bit(next, &bitmap))
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continue;
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apic = kvm->vcpus[next]->apic;
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if (apic && apic_enabled(apic))
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break;
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apic = NULL;
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} while (next != last);
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kvm->round_robin_prev_vcpu = next;
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if (!apic) {
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vcpu_id = ffs(bitmap) - 1;
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if (vcpu_id < 0) {
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vcpu_id = 0;
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printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
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}
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apic = kvm->vcpus[vcpu_id]->apic;
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}
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return apic;
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}
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static void apic_set_eoi(struct kvm_lapic *apic)
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