KVM: kill file->f_count abuse in kvm

Use kvm own refcounting instead of playing with ->filp->f_count.
That will allow to get rid of a lot of crap in anon_inode_getfd() and
kill a race in kvm_dev_ioctl_create_vm() (file might have been closed
immediately by another thread, so ->filp might point to already freed
struct file when we get around to setting it).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 4e16682ee8bb..398978972b7a 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -110,7 +110,6 @@ struct kvm {
                                         KVM_PRIVATE_MEM_SLOTS];
         struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
         struct list_head vm_list;
-        struct file *filp;
         struct kvm_io_bus mmio_bus;
         struct kvm_io_bus pio_bus;
         struct kvm_vm_stat stat;