[PATCH] Fix unlikely kvm_create vs decache_vcpus_on_cpu race

[Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>]

We add the kvm to the vm_list before initializing the vcpu mutexes,
which can be mutex_trylock()'ed by decache_vcpus_on_cpu().

Signed-off-by: Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>

diff -r b0134ad0aebe drivers/kvm/kvm_main.c
--- a/drivers/kvm/kvm_main.c	Thu Jul 19 16:37:12 2007 +1000
+++ b/drivers/kvm/kvm_main.c	Thu Jul 19 16:42:26 2007 +1000
@@ -310,9 +310,6 @@ static struct kvm *kvm_create_vm(void)
 	kvm_io_bus_init(&kvm->pio_bus);
 	spin_lock_init(&kvm->lock);
 	INIT_LIST_HEAD(&kvm->active_mmu_pages);
-	spin_lock(&kvm_lock);
-	list_add(&kvm->vm_list, &vm_list);
-	spin_unlock(&kvm_lock);
 	kvm_io_bus_init(&kvm->mmio_bus);
 	for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 		struct kvm_vcpu *vcpu = &kvm->vcpus[i];
@@ -322,6 +319,9 @@ static struct kvm *kvm_create_vm(void)
 		vcpu->kvm = kvm;
 		vcpu->mmu.root_hpa = INVALID_PAGE;
 	}
+	spin_lock(&kvm_lock);
+	list_add(&kvm->vm_list, &vm_list);
+	spin_unlock(&kvm_lock);
 	return kvm;
 }
 



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