KVM: Split vcpu creation to avoid vcpu_load() before preemption setup

Split kvm_arch_vcpu_create() into kvm_arch_vcpu_create() and
kvm_arch_vcpu_setup(), enabling preemption notification between the two.
This mean that we can now do vcpu_load() within kvm_arch_vcpu_setup().

Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 9dd6ad3c6c7b..7939b5c9a4b4 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -769,6 +769,10 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
 
         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
 
+        r = kvm_arch_vcpu_setup(vcpu);
+        if (r)
+                goto vcpu_destroy;
+
         mutex_lock(&kvm->lock);
         if (kvm->vcpus[n]) {
                 r = -EEXIST;