tree e7135b6a78c414219b3cef939a43073475273706
parent fc37f38a56a96d13b4451f7179bd7b3c0ad4af82
author Christian Borntraeger <borntraeger@de.ibm.com> 1407334678 +0200
committer chrmhoffmann <chrmhoffmann@gmail.com> 1586074841 +0200

KVM: s390: Fix user triggerable bug in dead code

commit 614a80e474b227cace52fd6e3c790554db8a396e upstream.

In the early days, we had some special handling for the
KVM_EXIT_S390_SIEIC exit, but this was gone in 2009 with commit
d7b0b5eb3000 (KVM: s390: Make psw available on all exits, not
just a subset).

Now this switch statement is just a sanity check for userspace
not messing with the kvm_run structure. Unfortunately, this
allows userspace to trigger a kernel BUG. Let's just remove
this switch statement.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
[lizf: Backported to 3.4:
 - adjust context
 - no KVM_EXIT_S390_TSCH and KVM_EXIT_DEBUG in 3.4]
Signed-off-by: Zefan Li <lizefan@huawei.com>