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>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2e4e089..cac761c 100644 (file)
--- 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 12f8d2d..17b52cc 100644 (file)
--- 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 3a367f3..1aa4d6e 100644 (file)
--- 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);