[PATCH V3 2/4] X86/Hyper-V: Add hyperv_nested_flush_guest_mapping ftrace support

[Tianyu Lan]

This patch is to add hyperv_nested_flush_guest_mapping support to trace
hvFlushGuestPhysicalAddressSpace hypercall.

Signed-off-by: Lan Tianyu <tianyu....@microsoft.com>
---
 arch/x86/hyperv/nested.c            |  3 +++
 arch/x86/include/asm/trace/hyperv.h | 14 ++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/arch/x86/hyperv/nested.c b/arch/x86/hyperv/nested.c
index 74dd38b5221d..42a3232f2835 100644
--- a/arch/x86/hyperv/nested.c
+++ b/arch/x86/hyperv/nested.c
@@ -25,6 +25,8 @@
 #include <asm/mshyperv.h>
 #include <asm/tlbflush.h>
 
+#include <asm/trace/hyperv.h>
+
 int hyperv_flush_guest_mapping(u64 as)
 {
        struct hv_guest_mapping_flush **flush_pcpu;
@@ -59,6 +61,7 @@ int hyperv_flush_guest_mapping(u64 as)
                ret = 0;
 
 fault:
+       trace_hyperv_nested_flush_guest_mapping(as, ret);
        return ret;
 }
 EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping);
diff --git a/arch/x86/include/asm/trace/hyperv.h 
b/arch/x86/include/asm/trace/hyperv.h
index 4253bca99989..e1ffe61de8d6 100644
--- a/arch/x86/include/asm/trace/hyperv.h
+++ b/arch/x86/include/asm/trace/hyperv.h
@@ -28,6 +28,20 @@ TRACE_EVENT(hyperv_mmu_flush_tlb_others,
                      __entry->addr, __entry->end)
        );
 
+TRACE_EVENT(hyperv_nested_flush_guest_mapping,
+           TP_PROTO(u64 as, int ret),
+           TP_ARGS(as, ret),
+
+           TP_STRUCT__entry(
+                   __field(u64, as)
+                   __field(int, ret)
+                   ),
+           TP_fast_assign(__entry->as = as;
+                          __entry->ret = ret;
+                   ),
+           TP_printk("address space %llx ret %d", __entry->as, __entry->ret)
+       );
+
 #endif /* CONFIG_HYPERV */
 
 #undef TRACE_INCLUDE_PATH
-- 
2.14.3