Commit 8feb4a04 authored by Feng Wu's avatar Feng Wu Committed by Paolo Bonzini

KVM: Define a new interface kvm_intr_is_single_vcpu()

This patch defines a new interface kvm_intr_is_single_vcpu(),
which can returns whether the interrupt is for single-CPU or not.

It is used by VT-d PI, since now we only support single-CPU
interrupts, For lowest-priority interrupts, if user configures
it via /proc/irq or uses irqbalance to make it single-CPU, we
can use PI to deliver the interrupts to it. Full functionality
of lowest-priority support will be added later.
Signed-off-by: default avatarFeng Wu <feng.wu@intel.com>
Reviewed-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent ebbfc765
...@@ -1241,4 +1241,7 @@ int x86_set_memory_region(struct kvm *kvm, ...@@ -1241,4 +1241,7 @@ int x86_set_memory_region(struct kvm *kvm,
bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu); bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu);
bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu); bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu);
bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
struct kvm_vcpu **dest_vcpu);
#endif /* _ASM_X86_KVM_HOST_H */ #endif /* _ASM_X86_KVM_HOST_H */
...@@ -297,6 +297,33 @@ int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e, ...@@ -297,6 +297,33 @@ int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
return r; return r;
} }
bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
struct kvm_vcpu **dest_vcpu)
{
int i, r = 0;
struct kvm_vcpu *vcpu;
if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu))
return true;
kvm_for_each_vcpu(i, vcpu, kvm) {
if (!kvm_apic_present(vcpu))
continue;
if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand,
irq->dest_id, irq->dest_mode))
continue;
if (++r == 2)
return false;
*dest_vcpu = vcpu;
}
return r == 1;
}
EXPORT_SYMBOL_GPL(kvm_intr_is_single_vcpu);
#define IOAPIC_ROUTING_ENTRY(irq) \ #define IOAPIC_ROUTING_ENTRY(irq) \
{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
.u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } } .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } }
......
...@@ -755,6 +755,65 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src, ...@@ -755,6 +755,65 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
return ret; return ret;
} }
bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
struct kvm_vcpu **dest_vcpu)
{
struct kvm_apic_map *map;
bool ret = false;
struct kvm_lapic *dst = NULL;
if (irq->shorthand)
return false;
rcu_read_lock();
map = rcu_dereference(kvm->arch.apic_map);
if (!map)
goto out;
if (irq->dest_mode == APIC_DEST_PHYSICAL) {
if (irq->dest_id == 0xFF)
goto out;
if (irq->dest_id >= ARRAY_SIZE(map->phys_map))
goto out;
dst = map->phys_map[irq->dest_id];
if (dst && kvm_apic_present(dst->vcpu))
*dest_vcpu = dst->vcpu;
else
goto out;
} else {
u16 cid;
unsigned long bitmap = 1;
int i, r = 0;
if (!kvm_apic_logical_map_valid(map))
goto out;
apic_logical_id(map, irq->dest_id, &cid, (u16 *)&bitmap);
if (cid >= ARRAY_SIZE(map->logical_map))
goto out;
for_each_set_bit(i, &bitmap, 16) {
dst = map->logical_map[cid][i];
if (++r == 2)
goto out;
}
if (dst && kvm_apic_present(dst->vcpu))
*dest_vcpu = dst->vcpu;
else
goto out;
}
ret = true;
out:
rcu_read_unlock();
return ret;
}
/* /*
* Add a pending IRQ into lapic. * Add a pending IRQ into lapic.
* Return 1 if successfully added and 0 if discarded. * Return 1 if successfully added and 0 if discarded.
......
...@@ -168,4 +168,6 @@ bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector); ...@@ -168,4 +168,6 @@ bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector);
void wait_lapic_expire(struct kvm_vcpu *vcpu); void wait_lapic_expire(struct kvm_vcpu *vcpu);
bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
struct kvm_vcpu **dest_vcpu);
#endif #endif
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