linux-kernel - [PATCH] x86/hyperv: Trace hv_set

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Date:   Tue,  6 Jun 2023 18:35:57 -0700
From:   Nischala Yelchuri <niyelchu@...ux.microsoft.com>
To:     linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Tyler Hicks <code@...icks.com>, boqun.feng@...il.com,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Nischala Yelchuri <niyelchu@...rosoft.com>,
        Nischala Yelchuri <niyelchu@...ux.microsoft.com>
Subject: [PATCH] x86/hyperv: Trace hv_set_register()

Add a new trace point trace_hyperv_set_register()
to capture register address and its value in hv_set_register().

Signed-off-by: Nischala Yelchuri <niyelchu@...ux.microsoft.com>
---
 arch/x86/include/asm/trace/hyperv.h | 14 ++++++++++++++
 arch/x86/kernel/cpu/mshyperv.c      |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/arch/x86/include/asm/trace/hyperv.h b/arch/x86/include/asm/trace/hyperv.h
index a8e5a7a2b..54b2f69f5 100644
--- a/arch/x86/include/asm/trace/hyperv.h
+++ b/arch/x86/include/asm/trace/hyperv.h
@@ -86,6 +86,20 @@ TRACE_EVENT(hyperv_send_ipi_one,
 		      __entry->cpu, __entry->vector)
 	);
 
+TRACE_EVENT(hyperv_set_register,
+	    TP_PROTO(unsigned int reg,
+		     u64 value),
+	    TP_ARGS(reg, value),
+	    TP_STRUCT__entry(
+		    __field(unsigned int, reg)
+		    __field(u64, value)
+		    ),
+	    TP_fast_assign(__entry->reg = reg;
+		    __entry->value = value;
+		    ),
+	    TP_printk("reg %u value %llu",
+		    __entry->reg, __entry->value)
+	);
 #endif /* CONFIG_HYPERV */
 
 #undef TRACE_INCLUDE_PATH
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index c7969e806..d4ef63f4e 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -32,6 +32,7 @@
 #include <asm/nmi.h>
 #include <clocksource/hyperv_timer.h>
 #include <asm/numa.h>
+#include <asm/trace/hyperv.h>
 
 /* Is Linux running as the root partition? */
 bool hv_root_partition;
@@ -98,6 +99,8 @@ EXPORT_SYMBOL_GPL(hv_get_register);
 
 void hv_set_register(unsigned int reg, u64 value)
 {
+	trace_hyperv_set_register(reg, value);
+
 	if (hv_nested)
 		reg = hv_get_nested_reg(reg);
 
-- 
2.25.1