KVM: Disallow fork() and similar games when using a VM

We don't want the meaning of guest userspace changing under our feet.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 1fd8158ced89..be18620bd656 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -305,6 +305,7 @@ struct kvm_vm_stat {
 
 struct kvm {
         struct mutex lock; /* protects everything except vcpus */
+        struct mm_struct *mm; /* userspace tied to this vm */
         int naliases;
         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
         int nmemslots;