KVM: x86: allow setting identity map addr with no vcpus only
Changing it afterwards doesn't make too much sense and will only result
in inconsistencies.
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 632561b..b0d2915 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4034,10 +4034,16 @@ long kvm_arch_vm_ioctl(struct file *filp,
case KVM_SET_IDENTITY_MAP_ADDR: {
u64 ident_addr;
+ mutex_lock(&kvm->lock);
+ r = -EINVAL;
+ if (kvm->created_vcpus)
+ goto set_identity_unlock;
r = -EFAULT;
if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
- goto out;
+ goto set_identity_unlock;
r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
+set_identity_unlock:
+ mutex_unlock(&kvm->lock);
break;
}
case KVM_SET_NR_MMU_PAGES: