summaryrefslogtreecommitdiffstats
path: root/arch/s390/kvm/trace-s390.h
diff options
context:
space:
mode:
authorCornelia Huck <cornelia.huck@de.ibm.com>2012-12-20 15:32:12 +0100
committerMarcelo Tosatti <mtosatti@redhat.com>2013-01-07 19:53:43 -0200
commitfa6b7fe9928d50444c29b29c8563746c6b0c6299 (patch)
tree0be284cf322eb82eefdb3df2743740e5578ba5c4 /arch/s390/kvm/trace-s390.h
parentd6712df95bcfea597fc3ea2405ec13e8b69a7b8c (diff)
KVM: s390: Add support for channel I/O instructions.
Add a new capability, KVM_CAP_S390_CSS_SUPPORT, which will pass intercepts for channel I/O instructions to userspace. Only I/O instructions interacting with I/O interrupts need to be handled in-kernel: - TEST PENDING INTERRUPTION (tpi) dequeues and stores pending interrupts entirely in-kernel. - TEST SUBCHANNEL (tsch) dequeues pending interrupts in-kernel and exits via KVM_EXIT_S390_TSCH to userspace for subchannel- related processing. Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Reviewed-by: Alexander Graf <agraf@suse.de> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/s390/kvm/trace-s390.h')
-rw-r--r--arch/s390/kvm/trace-s390.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/s390/kvm/trace-s390.h b/arch/s390/kvm/trace-s390.h
index 95fbc1ab88d..13f30f58a2d 100644
--- a/arch/s390/kvm/trace-s390.h
+++ b/arch/s390/kvm/trace-s390.h
@@ -204,6 +204,26 @@ TRACE_EVENT(kvm_s390_stop_request,
);
+/*
+ * Trace point for enabling channel I/O instruction support.
+ */
+TRACE_EVENT(kvm_s390_enable_css,
+ TP_PROTO(void *kvm),
+ TP_ARGS(kvm),
+
+ TP_STRUCT__entry(
+ __field(void *, kvm)
+ ),
+
+ TP_fast_assign(
+ __entry->kvm = kvm;
+ ),
+
+ TP_printk("enabling channel I/O support (kvm @ %p)\n",
+ __entry->kvm)
+ );
+
+
#endif /* _TRACE_KVMS390_H */
/* This part must be outside protection */