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KVM: ioapic/msi interrupt delivery consolidation 

ioapic_deliver() and kvm_set_msi() have code duplication. Move
the code into ioapic_deliver_entry() function and call it from
both places.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2009-03-05 16:34:49 +02:00 committed by Avi Kivity
parent 6da7e3f643
commit a53c17d21c
4 changed files with 42 additions and 65 deletions
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2
include/linux/kvm_host.h
View File

@ -364,7 +364,7 @@ void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask);
#ifdef __KVM_HAVE_IOAPIC
void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
void kvm_get_intr_delivery_bitmask(struct kvm *kvm,
union kvm_ioapic_redirect_entry *entry,
unsigned long *deliver_bitmask);
#endif

69
virt/kvm/ioapic.c
View File

@ -142,12 +142,40 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
}
}
int ioapic_deliver_entry(struct kvm *kvm, union kvm_ioapic_redirect_entry *e)
{
DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
int i, r = -1;
kvm_get_intr_delivery_bitmask(kvm, e, deliver_bitmask);
if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
ioapic_debug("no target on destination\n");
return r;
}
while ((i = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
< KVM_MAX_VCPUS) {
struct kvm_vcpu *vcpu = kvm->vcpus[i];
__clear_bit(i, deliver_bitmask);
if (vcpu) {
if (r < 0)
r = 0;
r += kvm_apic_set_irq(vcpu, e->fields.vector,
e->fields.delivery_mode,
e->fields.trig_mode);
} else
ioapic_debug("null destination vcpu: "
"mask=%x vector=%x delivery_mode=%x\n",
e->fields.deliver_bitmask,
e->fields.vector, e->fields.delivery_mode);
}
return r;
}
static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
{
union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
struct kvm_vcpu *vcpu;
int vcpu_id, r = -1;
ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
"vector=%x trig_mode=%x\n",
@ -155,39 +183,14 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
entry.fields.delivery_mode, entry.fields.vector,
entry.fields.trig_mode);
/* Always delivery PIT interrupt to vcpu 0 */
#ifdef CONFIG_X86
/* Always delivery PIT interrupt to vcpu 0 */
if (irq == 0) {
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
__set_bit(0, deliver_bitmask);
} else
entry.fields.dest_mode = 0; /* Physical mode. */
entry.fields.dest_id = ioapic->kvm->vcpus[0]->vcpu_id;
}
#endif
kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask);
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 (r < 0)
r = 0;
r += kvm_apic_set_irq(vcpu,
entry.fields.vector,
entry.fields.trig_mode,
entry.fields.delivery_mode);
} else
ioapic_debug("null destination vcpu: "
"mask=%x vector=%x delivery_mode=%x\n",
entry.fields.deliver_bitmask,
entry.fields.vector,
entry.fields.delivery_mode);
}
return r;
return ioapic_deliver_entry(ioapic->kvm, &entry);
}
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)

4
virt/kvm/ioapic.h
View File

@ -70,8 +70,8 @@ void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode);
int kvm_ioapic_init(struct kvm *kvm);
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level);
void kvm_ioapic_reset(struct kvm_ioapic *ioapic);
void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
void kvm_get_intr_delivery_bitmask(struct kvm *kvm,
union kvm_ioapic_redirect_entry *entry,
unsigned long *deliver_bitmask);
int ioapic_deliver_entry(struct kvm *kvm, union kvm_ioapic_redirect_entry *e);
#endif

32
virt/kvm/irq_comm.c
View File

@ -43,12 +43,11 @@ static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
}
void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
void kvm_get_intr_delivery_bitmask(struct kvm *kvm,
union kvm_ioapic_redirect_entry *entry,
unsigned long *deliver_bitmask)
{
int i;
struct kvm *kvm = ioapic->kvm;
struct kvm_vcpu *vcpu;
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
@ -90,7 +89,7 @@ void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
switch (entry->fields.delivery_mode) {
case IOAPIC_LOWEST_PRIORITY:
/* Select one in deliver_bitmask */
vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm,
vcpu = kvm_get_lowest_prio_vcpu(kvm,
entry->fields.vector, deliver_bitmask);
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
if (!vcpu)
@ -111,13 +110,7 @@ void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int level)
{
int vcpu_id, r = -1;
struct kvm_vcpu *vcpu;
struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
union kvm_ioapic_redirect_entry entry;
DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
BUG_ON(!ioapic);
entry.bits = 0;
entry.fields.dest_id = (e->msi.address_lo &
@ -133,26 +126,7 @@ static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
(unsigned long *)&e->msi.data);
/* TODO Deal with RH bit of MSI message address */
kvm_get_intr_delivery_bitmask(ioapic, &entry, 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;
}
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)
r = 0;
r += kvm_apic_set_irq(vcpu, entry.fields.vector,
entry.fields.dest_mode,
entry.fields.trig_mode);
}
}
return r;
return ioapic_deliver_entry(kvm, &entry);
}
/* This should be called with the kvm->lock mutex held