KVM: SVM: Add kvm_nested_intercepts tracepoint

This patch adds a tracepoint to get information about the
most important intercept bitmasks from the nested vmcb.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

3 files changed, 28 insertions, 0 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2e4e089646a7..cac761c6d1dc 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1845,6 +1845,11 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
                                nested_vmcb->control.event_inj,
                                nested_vmcb->control.nested_ctl);
 
+        trace_kvm_nested_intercepts(nested_vmcb->control.intercept_cr_read,
+                                    nested_vmcb->control.intercept_cr_write,
+                                    nested_vmcb->control.intercept_exceptions,
+                                    nested_vmcb->control.intercept);
+
         /* Clear internal status */
         kvm_clear_exception_queue(&svm->vcpu);
         kvm_clear_interrupt_queue(&svm->vcpu);
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 12f8d2dee984..17b52ccd9774 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -419,6 +419,28 @@ TRACE_EVENT(kvm_nested_vmrun,
                 __entry->npt ? "on" : "off")
 );
 
+TRACE_EVENT(kvm_nested_intercepts,
+            TP_PROTO(__u16 cr_read, __u16 cr_write, __u32 exceptions, __u64 intercept),
+            TP_ARGS(cr_read, cr_write, exceptions, intercept),
+
+        TP_STRUCT__entry(
+                __field(        __u16,          cr_read         )
+                __field(        __u16,          cr_write        )
+                __field(        __u32,          exceptions      )
+                __field(        __u64,          intercept       )
+        ),
+
+        TP_fast_assign(
+                __entry->cr_read        = cr_read;
+                __entry->cr_write       = cr_write;
+                __entry->exceptions     = exceptions;
+                __entry->intercept      = intercept;
+        ),
+
+        TP_printk("cr_read: %04x cr_write: %04x excp: %08x intercept: %016llx",
+                __entry->cr_read, __entry->cr_write, __entry->exceptions,
+                __entry->intercept)
+);
 /*
  * Tracepoint for #VMEXIT while nested
  */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3a367f35cebf..1aa4d6e26bad 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5909,3 +5909,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);