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KVM: bit ops for deliver_bitmap

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It's also convenient when we extend KVM supported vcpu number in the future.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Sheng Yang
2009-02-11 16:03:40 +08:00
committed by Avi Kivity
parent 110c2faeba
commit bfd349d073
3 changed files with 26 additions and 22 deletions
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24
virt/kvm/ioapic.c
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@@ -203,7 +203,7 @@ void kvm_ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest,
static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
{
union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
unsigned long deliver_bitmask;
DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
struct kvm_vcpu *vcpu;
int vcpu_id, r = -1;
@@ -213,22 +213,24 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
entry.fields.delivery_mode, entry.fields.vector,
entry.fields.trig_mode);
kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask);
if (!deliver_bitmask) {
ioapic_debug("no target on destination\n");
return 0;
}
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
/* Always delivery PIT interrupt to vcpu 0 */
#ifdef CONFIG_X86
if (irq == 0)
deliver_bitmask = 1;
__set_bit(0, deliver_bitmask);
else
#endif
kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask);
for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
if (!(deliver_bitmask & (1 << vcpu_id)))
continue;
deliver_bitmask &= ~(1 << vcpu_id);
if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
ioapic_debug("no target on destination\n");
return 0;
}
while ((vcpu_id = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
< KVM_MAX_VCPUS) {
__clear_bit(vcpu_id, deliver_bitmask);
vcpu = ioapic->kvm->vcpus[vcpu_id];
if (vcpu) {
if (entry.fields.delivery_mode ==