KVM: async_pf: Async page fault support on s390
This patch enables async page faults for s390 kvm guests.
It provides the userspace API to enable and disable_wait this feature.
The disable_wait will enforce that the feature is off by waiting on it.
Also it includes the diagnose code, called by the guest to enable async page faults.
The async page faults will use an already existing guest interface for this
purpose, as described in "CP Programming Services (SC24-6084)".
Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
diff --git a/arch/s390/kvm/trace.h b/arch/s390/kvm/trace.h
index 3db76b2..e8e7213 100644
--- a/arch/s390/kvm/trace.h
+++ b/arch/s390/kvm/trace.h
@@ -30,6 +30,52 @@
TP_printk("%02d[%016lx-%016lx]: " p_str, __entry->id, \
__entry->pswmask, __entry->pswaddr, p_args)
+TRACE_EVENT(kvm_s390_major_guest_pfault,
+ TP_PROTO(VCPU_PROTO_COMMON),
+ TP_ARGS(VCPU_ARGS_COMMON),
+
+ TP_STRUCT__entry(
+ VCPU_FIELD_COMMON
+ ),
+
+ TP_fast_assign(
+ VCPU_ASSIGN_COMMON
+ ),
+ VCPU_TP_PRINTK("%s", "major fault, maybe applicable for pfault")
+ );
+
+TRACE_EVENT(kvm_s390_pfault_init,
+ TP_PROTO(VCPU_PROTO_COMMON, long pfault_token),
+ TP_ARGS(VCPU_ARGS_COMMON, pfault_token),
+
+ TP_STRUCT__entry(
+ VCPU_FIELD_COMMON
+ __field(long, pfault_token)
+ ),
+
+ TP_fast_assign(
+ VCPU_ASSIGN_COMMON
+ __entry->pfault_token = pfault_token;
+ ),
+ VCPU_TP_PRINTK("init pfault token %ld", __entry->pfault_token)
+ );
+
+TRACE_EVENT(kvm_s390_pfault_done,
+ TP_PROTO(VCPU_PROTO_COMMON, long pfault_token),
+ TP_ARGS(VCPU_ARGS_COMMON, pfault_token),
+
+ TP_STRUCT__entry(
+ VCPU_FIELD_COMMON
+ __field(long, pfault_token)
+ ),
+
+ TP_fast_assign(
+ VCPU_ASSIGN_COMMON
+ __entry->pfault_token = pfault_token;
+ ),
+ VCPU_TP_PRINTK("done pfault token %ld", __entry->pfault_token)
+ );
+
/*
* Tracepoints for SIE entry and exit.
*/