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KVM: consolidate ioapic/ipi interrupt delivery logic 

Use kvm_apic_match_dest() in kvm_get_intr_delivery_bitmask() instead
of duplicating the same code. Use kvm_get_intr_delivery_bitmask() in
apic_send_ipi() to figure out ipi destination instead of reimplementing
the logic.

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 16:34:54 +02:00 committed by Avi Kivity
parent a53c17d21c
commit 343f94fe4d
8 changed files with 69 additions and 105 deletions
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8
arch/ia64/kvm/kvm-ia64.c
View File

@ -1852,6 +1852,14 @@ struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
return lvcpu;
}
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode)
{
return (dest_mode == 0) ?
kvm_apic_match_physical_addr(target, dest) :
kvm_apic_match_logical_addr(target, dest);
}
static int find_highest_bits(int *dat)
{
u32 bits, bitnum;

3
arch/ia64/kvm/lapic.h
View File

@ -20,6 +20,9 @@ void kvm_free_lapic(struct kvm_vcpu *vcpu);
int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest);
int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda);
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode);
bool kvm_apic_present(struct kvm_vcpu *vcpu);
int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig);
#endif

67
arch/x86/kvm/lapic.c
View File

@ -260,7 +260,7 @@ static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
{
return kvm_apic_id(apic) == dest;
return dest == 0xff || kvm_apic_id(apic) == dest;
}
int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
@ -289,37 +289,34 @@ int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
return result;
}
static int apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode)
{
int result = 0;
struct kvm_lapic *target = vcpu->arch.apic;
apic_debug("target %p, source %p, dest 0x%x, "
"dest_mode 0x%x, short_hand 0x%x",
"dest_mode 0x%x, short_hand 0x%x\n",
target, source, dest, dest_mode, short_hand);
ASSERT(!target);
switch (short_hand) {
case APIC_DEST_NOSHORT:
if (dest_mode == 0) {
if (dest_mode == 0)
/* Physical mode. */
if ((dest == 0xFF) || (dest == kvm_apic_id(target)))
result = 1;
} else
result = kvm_apic_match_physical_addr(target, dest);
else
/* Logical mode. */
result = kvm_apic_match_logical_addr(target, dest);
break;
case APIC_DEST_SELF:
if (target == source)
result = 1;
result = (target == source);
break;
case APIC_DEST_ALLINC:
result = 1;
break;
case APIC_DEST_ALLBUT:
if (target != source)
result = 1;
result = (target != source);
break;
default:
printk(KERN_WARNING "Bad dest shorthand value %x\n",
@ -492,38 +489,26 @@ static void apic_send_ipi(struct kvm_lapic *apic)
unsigned int delivery_mode = icr_low & APIC_MODE_MASK;
unsigned int vector = icr_low & APIC_VECTOR_MASK;
struct kvm_vcpu *target;
struct kvm_vcpu *vcpu;
DECLARE_BITMAP(lpr_map, KVM_MAX_VCPUS);
DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
int i;
bitmap_zero(lpr_map, KVM_MAX_VCPUS);
apic_debug("icr_high 0x%x, icr_low 0x%x, "
"short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
"dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
icr_high, icr_low, short_hand, dest,
trig_mode, level, dest_mode, delivery_mode, vector);
for (i = 0; i < KVM_MAX_VCPUS; i++) {
vcpu = apic->vcpu->kvm->vcpus[i];
if (!vcpu)
continue;
kvm_get_intr_delivery_bitmask(apic->vcpu->kvm, apic, dest, dest_mode,
delivery_mode == APIC_DM_LOWEST, short_hand,
deliver_bitmask);
if (vcpu->arch.apic &&
apic_match_dest(vcpu, apic, short_hand, dest, dest_mode)) {
if (delivery_mode == APIC_DM_LOWEST)
__set_bit(vcpu->vcpu_id, lpr_map);
else
__apic_accept_irq(vcpu->arch.apic, delivery_mode,
vector, level, trig_mode);
}
}
if (delivery_mode == APIC_DM_LOWEST) {
target = kvm_get_lowest_prio_vcpu(vcpu->kvm, vector, lpr_map);
if (target != NULL)
__apic_accept_irq(target->arch.apic, delivery_mode,
vector, level, trig_mode);
while ((i = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
< KVM_MAX_VCPUS) {
struct kvm_vcpu *vcpu = apic->vcpu->kvm->vcpus[i];
__clear_bit(i, deliver_bitmask);
if (vcpu)
__apic_accept_irq(vcpu->arch.apic, delivery_mode,
vector, level, trig_mode);
}
}
@ -930,16 +915,14 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_lapic_reset);
bool kvm_apic_present(struct kvm_vcpu *vcpu)
{
return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic);
}
int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
int ret = 0;
if (!apic)
return 0;
ret = apic_enabled(apic);
return ret;
return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic);
}
EXPORT_SYMBOL_GPL(kvm_lapic_enabled);

2
arch/x86/kvm/lapic.h
View File

@ -37,6 +37,8 @@ u64 kvm_get_apic_base(struct kvm_vcpu *vcpu);
void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data);
void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu);
int kvm_lapic_enabled(struct kvm_vcpu *vcpu);
bool kvm_apic_present(struct kvm_vcpu *vcpu);
bool kvm_lapic_present(struct kvm_vcpu *vcpu);
int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu);
void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr);

5
include/linux/kvm_host.h
View File

@ -363,11 +363,6 @@ void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
struct kvm_irq_mask_notifier *kimn);
void kvm_fire_mask_notifiers(struct kvm *kvm, int irq, bool mask);
#ifdef __KVM_HAVE_IOAPIC
void kvm_get_intr_delivery_bitmask(struct kvm *kvm,
union kvm_ioapic_redirect_entry *entry,
unsigned long *deliver_bitmask);
#endif
int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level);
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
void kvm_register_irq_ack_notifier(struct kvm *kvm,

5
virt/kvm/ioapic.c
View File

@ -147,7 +147,10 @@ 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);
kvm_get_intr_delivery_bitmask(kvm, NULL, e->fields.dest_id,
e->fields.dest_mode,
e->fields.delivery_mode == IOAPIC_LOWEST_PRIORITY,
0, deliver_bitmask);
if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
ioapic_debug("no target on destination\n");

10
virt/kvm/ioapic.h
View File

@ -65,13 +65,15 @@ static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
}
struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
unsigned long *bitmap);
unsigned long *bitmap);
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode);
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 *kvm,
union kvm_ioapic_redirect_entry *entry,
unsigned long *deliver_bitmask);
void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
int dest_id, int dest_mode, bool low_prio, int short_hand,
unsigned long *deliver_bitmask);
int ioapic_deliver_entry(struct kvm *kvm, union kvm_ioapic_redirect_entry *e);
#endif

74
virt/kvm/irq_comm.c
View File

@ -43,67 +43,35 @@ 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 *kvm,
union kvm_ioapic_redirect_entry *entry,
unsigned long *deliver_bitmask)
void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
int dest_id, int dest_mode, bool low_prio, int short_hand,
unsigned long *deliver_bitmask)
{
int i;
struct kvm_vcpu *vcpu;
if (dest_mode == 0 && dest_id == 0xff && low_prio)
printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
for (i = 0; i < KVM_MAX_VCPUS; i++) {
vcpu = kvm->vcpus[i];
if (entry->fields.dest_mode == 0) { /* Physical mode. */
if (entry->fields.dest_id == 0xFF) { /* Broadcast. */
for (i = 0; i < KVM_MAX_VCPUS; ++i)
if (kvm->vcpus[i] && kvm->vcpus[i]->arch.apic)
__set_bit(i, deliver_bitmask);
/* Lowest priority shouldn't combine with broadcast */
if (entry->fields.delivery_mode ==
IOAPIC_LOWEST_PRIORITY && printk_ratelimit())
printk(KERN_INFO "kvm: apic: phys broadcast "
"and lowest prio\n");
return;
}
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
vcpu = kvm->vcpus[i];
if (!vcpu)
continue;
if (kvm_apic_match_physical_addr(vcpu->arch.apic,
entry->fields.dest_id)) {
if (vcpu->arch.apic)
__set_bit(i, deliver_bitmask);
break;
}
}
} else if (entry->fields.dest_id != 0) /* Logical mode, MDA non-zero. */
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
vcpu = kvm->vcpus[i];
if (!vcpu)
continue;
if (vcpu->arch.apic &&
kvm_apic_match_logical_addr(vcpu->arch.apic,
entry->fields.dest_id))
__set_bit(i, deliver_bitmask);
}
if (!vcpu || !kvm_apic_present(vcpu))
continue;
switch (entry->fields.delivery_mode) {
case IOAPIC_LOWEST_PRIORITY:
/* Select one in deliver_bitmask */
vcpu = kvm_get_lowest_prio_vcpu(kvm,
entry->fields.vector, deliver_bitmask);
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
if (!vcpu)
return;
__set_bit(vcpu->vcpu_id, deliver_bitmask);
break;
case IOAPIC_FIXED:
case IOAPIC_NMI:
break;
default:
if (printk_ratelimit())
printk(KERN_INFO "kvm: unsupported delivery mode %d\n",
entry->fields.delivery_mode);
if (!kvm_apic_match_dest(vcpu, src, short_hand, dest_id,
dest_mode))
continue;
__set_bit(i, deliver_bitmask);
}
if (low_prio) {
vcpu = kvm_get_lowest_prio_vcpu(kvm, 0, deliver_bitmask);
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
if (vcpu)
__set_bit(vcpu->vcpu_id, deliver_bitmask);
}
}