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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>
This commit is contained in:
Takuya Yoshikawa 2010-03-15 22:13:30 +09:00 committed by Avi Kivity
parent 3129994458
commit 6ce5a090a9
2 changed files with 10 additions and 4 deletions
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2
virt/kvm/coalesced_mmio.c
View File

@ -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;

12
virt/kvm/kvm_main.c
View File

@ -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);