tree d6acb37feafc9c81b4402704568648880437cbb1
parent 3a92a01317280f81b43d07c986c15f2607414ba7
author Claudio Imbrenda <imbrenda@linux.ibm.com> 1607341955 +0100
committer Janosch Frank <frankja@linux.ibm.com> 1615201364 +0100

s390x: introduce leave_pstate to leave userspace

In most testcases, we enter problem state (userspace) just to test if a
privileged instruction causes a fault. In some cases, though, we need
to test if an instruction works properly in userspace. This means that
we do not expect a fault, and we need an orderly way to leave problem
state afterwards.

This patch introduces a simple system based on the SVC instruction.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/kvm/20210302114107.501837-2-imbrenda@linux.ibm.com/
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>