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KVM: Call kvm_apic_match_dest() to check destination vcpu 

For a given vcpu, kvm_apic_match_dest() will tell you whether
the vcpu in the destination list quickly. Drop kvm_calculate_eoi_exitmap()
and use kvm_apic_match_dest() instead.

Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Yang Zhang 2013-04-07 08:25:18 +08:00 committed by Gleb Natapov
parent 99437a2782
commit 44944d4d28
3 changed files with 3 additions and 57 deletions
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47
arch/x86/kvm/lapic.c
View File

@ -145,53 +145,6 @@ static inline int kvm_apic_id(struct kvm_lapic *apic)
return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
}
void kvm_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
struct kvm_lapic_irq *irq,
u64 *eoi_exit_bitmap)
{
struct kvm_lapic **dst;
struct kvm_apic_map *map;
unsigned long bitmap = 1;
int i;
rcu_read_lock();
map = rcu_dereference(vcpu->kvm->arch.apic_map);
if (unlikely(!map)) {
__set_bit(irq->vector, (unsigned long *)eoi_exit_bitmap);
goto out;
}
if (irq->dest_mode == 0) { /* physical mode */
if (irq->delivery_mode == APIC_DM_LOWEST ||
irq->dest_id == 0xff) {
__set_bit(irq->vector,
(unsigned long *)eoi_exit_bitmap);
goto out;
}
dst = &map->phys_map[irq->dest_id & 0xff];
} else {
u32 mda = irq->dest_id << (32 - map->ldr_bits);
dst = map->logical_map[apic_cluster_id(map, mda)];
bitmap = apic_logical_id(map, mda);
}
for_each_set_bit(i, &bitmap, 16) {
if (!dst[i])
continue;
if (dst[i]->vcpu == vcpu) {
__set_bit(irq->vector,
(unsigned long *)eoi_exit_bitmap);
break;
}
}
out:
rcu_read_unlock();
}
static void recalculate_apic_map(struct kvm *kvm)
{
struct kvm_apic_map *new, *old = NULL;

4
arch/x86/kvm/lapic.h
View File

@ -160,10 +160,6 @@ static inline u16 apic_logical_id(struct kvm_apic_map *map, u32 ldr)
return ldr & map->lid_mask;
}
void kvm_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
struct kvm_lapic_irq *irq,
u64 *eoi_bitmap);
static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu)
{
return vcpu->arch.apic->pending_events;

9
virt/kvm/ioapic.c
View File

@ -124,7 +124,6 @@ void kvm_ioapic_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
{
struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
union kvm_ioapic_redirect_entry *e;
struct kvm_lapic_irq irqe;
int index;
spin_lock(&ioapic->lock);
@ -135,11 +134,9 @@ void kvm_ioapic_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
(e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC,
index))) {
irqe.dest_id = e->fields.dest_id;
irqe.vector = e->fields.vector;
irqe.dest_mode = e->fields.dest_mode;
irqe.delivery_mode = e->fields.delivery_mode << 8;
kvm_calculate_eoi_exitmap(vcpu, &irqe, eoi_exit_bitmap);
if (kvm_apic_match_dest(vcpu, NULL, 0,
e->fields.dest_id, e->fields.dest_mode))
__set_bit(e->fields.vector, (unsigned long *)eoi_exit_bitmap);
}
}
spin_unlock(&ioapic->lock);