KVM: s390: lazy enable RI

Only enable runtime instrumentation if the guest issues an RI related
instruction or if userspace changes the riccb to a valid state.
This makes entry/exit a tiny bit faster.

Initial patch by Christian Borntraeger
Signed-off-by: Fan Zhang <zhangfan@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index dfd0ca2638fa..1cab8a177d0e 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -29,6 +29,7 @@ static const intercept_handler_t instruction_handlers[256] = {
         [0x01] = kvm_s390_handle_01,
         [0x82] = kvm_s390_handle_lpsw,
         [0x83] = kvm_s390_handle_diag,
+        [0xaa] = kvm_s390_handle_aa,
         [0xae] = kvm_s390_handle_sigp,
         [0xb2] = kvm_s390_handle_b2,
         [0xb6] = kvm_s390_handle_stctl,