KVM: x86: disallow multiple KVM_CREATE_IRQCHIP

[deliverable/linux.git] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 719f31eecd3d7fffd826b54162f4ac25133d5434..97f6f9565ac9cba10426e98b63b273967a585971 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2362,25 +2362,39 @@ long kvm_arch_vm_ioctl(struct file *filp,
                if (r)
                        goto out;
                break;
-       case KVM_CREATE_IRQCHIP:
+       case KVM_CREATE_IRQCHIP: {
+               struct kvm_pic *vpic;
+
+               mutex_lock(&kvm->lock);
+               r = -EEXIST;
+               if (kvm->arch.vpic)
+                       goto create_irqchip_unlock;
                r = -ENOMEM;
-               kvm->arch.vpic = kvm_create_pic(kvm);
-               if (kvm->arch.vpic) {
+               vpic = kvm_create_pic(kvm);
+               if (vpic) {
                        r = kvm_ioapic_init(kvm);
                        if (r) {
-                               kfree(kvm->arch.vpic);
-                               kvm->arch.vpic = NULL;
-                               goto out;
+                               kfree(vpic);
+                               goto create_irqchip_unlock;
                        }
                } else
-                       goto out;
+                       goto create_irqchip_unlock;
+               smp_wmb();
+               kvm->arch.vpic = vpic;
+               smp_wmb();
                r = kvm_setup_default_irq_routing(kvm);
                if (r) {
+                       mutex_lock(&kvm->irq_lock);
                        kfree(kvm->arch.vpic);
                        kfree(kvm->arch.vioapic);
-                       goto out;
+                       kvm->arch.vpic = NULL;
+                       kvm->arch.vioapic = NULL;
+                       mutex_unlock(&kvm->irq_lock);
                }
+       create_irqchip_unlock:
+               mutex_unlock(&kvm->lock);
                break;
+       }
        case KVM_CREATE_PIT:
                u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
                goto create_pit;