KVM: coalesced_mmio: fix kvm_coalesced_mmio_init()'s error handling

kvm_coalesced_mmio_init() keeps to hold the addresses of a coalesced
mmio ring page and dev even after it has freed them.

Also, if this function fails, though it might be rare, it seems to be
suggesting the system's serious state: so we'd better stop the works
following the kvm_creat_vm().

This patch clears these problems.

  We move the coalesced mmio's initialization out of kvm_create_vm().
  This seems to be natural because it includes a registration which
  can be done only when vm is successfully created.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

2 files changed, 10 insertions, 4 deletions

diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index b66001f8754c..53850177163f 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -120,8 +120,10 @@ int kvm_coalesced_mmio_init(struct kvm *kvm)
         return ret;
 
 out_free_dev:
+        kvm->coalesced_mmio_dev = NULL;
         kfree(dev);
 out_free_page:
+        kvm->coalesced_mmio_ring = NULL;
         __free_page(page);
 out_err:
         return ret;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 0db6dfcc8420..55a5d4804499 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -422,9 +422,6 @@ static struct kvm *kvm_create_vm(void)
         spin_lock(&kvm_lock);
         list_add(&kvm->vm_list, &vm_list);
         spin_unlock(&kvm_lock);
-#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
-        kvm_coalesced_mmio_init(kvm);
-#endif
 out:
         return kvm;
 
@@ -1753,12 +1750,19 @@ static struct file_operations kvm_vm_fops = {
 
 static int kvm_dev_ioctl_create_vm(void)
 {
-        int fd;
+        int fd, r;
         struct kvm *kvm;
 
         kvm = kvm_create_vm();
         if (IS_ERR(kvm))
                 return PTR_ERR(kvm);
+#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
+        r = kvm_coalesced_mmio_init(kvm);
+        if (r < 0) {
+                kvm_put_kvm(kvm);
+                return r;
+        }
+#endif
         fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
         if (fd < 0)
                 kvm_put_kvm(kvm);