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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 <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
This commit is contained in:
Sheng Yang 2009-02-11 16:03:40 +08:00 • committed by Avi Kivity
commit bfd349d073
3 changed files with 26 additions and 22 deletions
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24
virt/kvm/ioapic.c
View file

@ -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 ==

17
virt/kvm/irq_comm.c
View file

@ -56,7 +56,7 @@ void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
case IOAPIC_LOWEST_PRIORITY:
vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm,
entry->fields.vector, deliver_bitmask);
*deliver_bitmask = 1 << vcpu->vcpu_id;
__set_bit(vcpu->vcpu_id, deliver_bitmask);
break;
case IOAPIC_FIXED:
case IOAPIC_NMI:
@ -76,10 +76,12 @@ static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
struct kvm_vcpu *vcpu;
struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
union kvm_ioapic_redirect_entry entry;
unsigned long deliver_bitmask;
DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
BUG_ON(!ioapic);
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
entry.bits = 0;
entry.fields.dest_id = (e->msi.address_lo &
MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
@ -95,16 +97,15 @@ static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
/* TODO Deal with RH bit of MSI message address */
kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask);
kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask);
if (!deliver_bitmask) {
if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
printk(KERN_WARNING "kvm: no destination for MSI delivery!");
return -1;
}
for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
if (!(deliver_bitmask & (1 << vcpu_id)))
continue;
deliver_bitmask &= ~(1 << vcpu_id);
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 (r < 0)