KVM: x86: dynamic kvm_apic_map

[karo-tx-linux.git] / arch / x86 / kvm / lapic.c

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 9880d03f533dde0ae0179070acf75187b85504ef..224fc1c5fcc67996e0f01f30bbcc12e0b6283072 100644 (file)
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -120,7 +120,7 @@ static inline bool kvm_apic_map_get_logical_dest(struct kvm_apic_map *map,
        switch (map->mode) {
        case KVM_APIC_MODE_X2APIC: {
                u32 offset = (dest_id >> 16) * 16;
-               u32 max_apic_id = ARRAY_SIZE(map->phys_map) - 1;
+               u32 max_apic_id = map->max_apic_id;
 
                if (offset <= max_apic_id) {
                        u8 cluster_size = min(max_apic_id - offset + 1, 16U);
@@ -152,14 +152,22 @@ static void recalculate_apic_map(struct kvm *kvm)
        struct kvm_apic_map *new, *old = NULL;
        struct kvm_vcpu *vcpu;
        int i;
-
-       new = kzalloc(sizeof(struct kvm_apic_map), GFP_KERNEL);
+       u32 max_id = 255;
 
        mutex_lock(&kvm->arch.apic_map_lock);
 
+       kvm_for_each_vcpu(i, vcpu, kvm)
+               if (kvm_apic_present(vcpu))
+                       max_id = max(max_id, kvm_apic_id(vcpu->arch.apic));
+
+       new = kzalloc(sizeof(struct kvm_apic_map) +
+                     sizeof(struct kvm_lapic *) * (max_id + 1), GFP_KERNEL);
+
        if (!new)
                goto out;
 
+       new->max_apic_id = max_id;
+
        kvm_for_each_vcpu(i, vcpu, kvm) {
                struct kvm_lapic *apic = vcpu->arch.apic;
                struct kvm_lapic **cluster;
@@ -172,7 +180,7 @@ static void recalculate_apic_map(struct kvm *kvm)
                aid = kvm_apic_id(apic);
                ldr = kvm_lapic_get_reg(apic, APIC_LDR);
 
-               if (aid < ARRAY_SIZE(new->phys_map))
+               if (aid <= new->max_apic_id)
                        new->phys_map[aid] = apic;
 
                if (apic_x2apic_mode(apic)) {
@@ -710,7 +718,7 @@ static inline bool kvm_apic_map_get_dest_lapic(struct kvm *kvm,
                return false;
 
        if (irq->dest_mode == APIC_DEST_PHYSICAL) {
-               if (irq->dest_id >= ARRAY_SIZE(map->phys_map)) {
+               if (irq->dest_id > map->max_apic_id) {
                        *bitmap = 0;
                } else {
                        *dst = &map->phys_map[irq->dest_id];