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authorJan Kiszka <jan.kiszka@siemens.com>2013-03-19 12:36:46 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-05 10:16:37 -0700
commitd104388ff9bdb5ec76d5337cd94f9ed4bbf73fbc (patch)
tree47ad30d1ce265c83ce110118f2cf57d013b5d5b8
parent8c7028941242372574880e513207abdbe486c3e5 (diff)
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KVM: Clean up error handling during VCPU creation
commit d780592b99d7d8a5ff905f6bacca519d4a342c76 upstream. So far kvm_arch_vcpu_setup is responsible for freeing the vcpu struct if it fails. Move this confusing resonsibility back into the hands of kvm_vm_ioctl_create_vcpu. Only kvm_arch_vcpu_setup of x86 is affected, all other archs cannot fail. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/x86/kvm/x86.c5
-rw-r--r--virt/kvm/kvm_main.c11
2 files changed, 6 insertions, 10 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fbb0936..681eab7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6116,12 +6116,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
if (r == 0)
r = kvm_mmu_setup(vcpu);
vcpu_put(vcpu);
- if (r < 0)
- goto free_vcpu;
- return 0;
-free_vcpu:
- kvm_x86_ops->vcpu_free(vcpu);
return r;
}
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 6b39ba9..5841d06 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1616,18 +1616,18 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
r = kvm_arch_vcpu_setup(vcpu);
if (r)
- return r;
+ goto vcpu_destroy;
mutex_lock(&kvm->lock);
if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
r = -EINVAL;
- goto vcpu_destroy;
+ goto unlock_vcpu_destroy;
}
kvm_for_each_vcpu(r, v, kvm)
if (v->vcpu_id == id) {
r = -EEXIST;
- goto vcpu_destroy;
+ goto unlock_vcpu_destroy;
}
BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
@@ -1637,7 +1637,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
r = create_vcpu_fd(vcpu);
if (r < 0) {
kvm_put_kvm(kvm);
- goto vcpu_destroy;
+ goto unlock_vcpu_destroy;
}
kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
@@ -1651,8 +1651,9 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
mutex_unlock(&kvm->lock);
return r;
-vcpu_destroy:
+unlock_vcpu_destroy:
mutex_unlock(&kvm->lock);
+vcpu_destroy:
kvm_arch_vcpu_destroy(vcpu);
return r;
}