KVM: Trace mmio

Signed-off-by: Avi Kivity <avi@redhat.com>

2 files changed, 43 insertions, 1 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index af40e23df251..d32e3c6d3175 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -37,6 +37,8 @@
 #include <linux/iommu.h>
 #include <linux/intel-iommu.h>
 #include <linux/cpufreq.h>
+#include <trace/events/kvm.h>
+#undef TRACE_INCLUDE_FILE
 #define CREATE_TRACE_POINTS
 #include "trace.h"
 
@@ -2425,6 +2427,8 @@ static int emulator_read_emulated(unsigned long addr,
 
         if (vcpu->mmio_read_completed) {
                 memcpy(val, vcpu->mmio_data, bytes);
+                trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
+                               vcpu->mmio_phys_addr, *(u64 *)val);
                 vcpu->mmio_read_completed = 0;
                 return X86EMUL_CONTINUE;
         }
@@ -2445,8 +2449,12 @@ mmio:
         /*
          * Is this MMIO handled locally?
          */
-        if (!vcpu_mmio_read(vcpu, gpa, bytes, val))
+        if (!vcpu_mmio_read(vcpu, gpa, bytes, val)) {
+                trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, gpa, *(u64 *)val);
                 return X86EMUL_CONTINUE;
+        }
+
+        trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
 
         vcpu->mmio_needed = 1;
         vcpu->mmio_phys_addr = gpa;
@@ -2490,6 +2498,7 @@ static int emulator_write_emulated_onepage(unsigned long addr,
                 return X86EMUL_CONTINUE;
 
 mmio:
+        trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
         /*
          * Is this MMIO handled locally?
          */
diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
index 035232dc84e0..77022af48492 100644
--- a/include/trace/events/kvm.h
+++ b/include/trace/events/kvm.h
@@ -56,6 +56,39 @@ TRACE_EVENT(kvm_ack_irq,
 
 
 #endif /* defined(__KVM_HAVE_IOAPIC) */
+
+#define KVM_TRACE_MMIO_READ_UNSATISFIED 0
+#define KVM_TRACE_MMIO_READ 1
+#define KVM_TRACE_MMIO_WRITE 2
+
+#define kvm_trace_symbol_mmio \
+        { KVM_TRACE_MMIO_READ_UNSATISFIED, "unsatisfied-read" }, \
+        { KVM_TRACE_MMIO_READ, "read" }, \
+        { KVM_TRACE_MMIO_WRITE, "write" }
+
+TRACE_EVENT(kvm_mmio,
+        TP_PROTO(int type, int len, u64 gpa, u64 val),
+        TP_ARGS(type, len, gpa, val),
+
+        TP_STRUCT__entry(
+                __field(        u32,    type            )
+                __field(        u32,    len             )
+                __field(        u64,    gpa             )
+                __field(        u64,    val             )
+        ),
+
+        TP_fast_assign(
+                __entry->type           = type;
+                __entry->len            = len;
+                __entry->gpa            = gpa;
+                __entry->val            = val;
+        ),
+
+        TP_printk("mmio %s len %u gpa 0x%llx val 0x%llx",
+                  __print_symbolic(__entry->type, kvm_trace_symbol_mmio),
+                  __entry->len, __entry->gpa, __entry->val)
+);
+
 #endif /* _TRACE_KVM_MAIN_H */
 
 /* This part must be outside protection */