[Xen-devel] [PATCH] Trace traps and realmode exits

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

Add some more tracing to vmexits that don't currently have
trace information:
 * VMX realmode emulation
 * Various VMX traps
 * Fast-pathed APIC accesses

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

diff -r 96bbdc894224 -r 68ac72db10a3 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c        Fri Nov 25 15:48:03 2011 +0000
+++ b/xen/arch/x86/hvm/vmx/vmx.c        Fri Nov 25 17:12:41 2011 +0000
@@ -2217,6 +2217,7 @@ static int vmx_handle_eoi_write(void)
     {
         update_guest_eip(); /* Safe: APIC data write */
         vlapic_EOI_set(vcpu_vlapic(current));
+        HVMTRACE_0D(VLAPIC);
         return 1;
     }
 
@@ -2324,6 +2325,7 @@ asmlinkage void vmx_vmexit_handler(struc
             {
                 perfc_incr(realmode_exits);
                 v->arch.hvm_vmx.vmx_emulate = 1;
+                HVMTRACE_0D(REALMODE_EMULATE);
                 return;
             }
         case EXIT_REASON_EXTERNAL_INTERRUPT:
@@ -2343,6 +2345,7 @@ asmlinkage void vmx_vmexit_handler(struc
         default:
             v->arch.hvm_vmx.vmx_emulate = 1;
             perfc_incr(realmode_exits);
+            HVMTRACE_0D(REALMODE_EMULATE);
             return;
         }
     }
@@ -2386,6 +2389,7 @@ asmlinkage void vmx_vmexit_handler(struc
              * Table 23-1, "Exit Qualification for Debug Exceptions").
              */
             exit_qualification = __vmread(EXIT_QUALIFICATION);
+            HVMTRACE_1D(TRAP_DEBUG, exit_qualification);
             write_debugreg(6, exit_qualification | 0xffff0ff0);
             if ( !v->domain->debugger_attached || cpu_has_monitor_trap_flag )
                 goto exit_and_crash;
@@ -2393,6 +2397,7 @@ asmlinkage void vmx_vmexit_handler(struc
             break;
         case TRAP_int3: 
         {
+            HVMTRACE_1D(TRAP, vector);
             if ( v->domain->debugger_attached )
             {
                 update_guest_eip(); /* Safe: INT3 */            
@@ -2415,6 +2420,7 @@ asmlinkage void vmx_vmexit_handler(struc
             goto exit_and_crash;
         }
         case TRAP_no_device:
+            HVMTRACE_1D(TRAP, vector);
             vmx_fpu_dirty_intercept();
             break;
         case TRAP_page_fault:
@@ -2455,9 +2461,11 @@ asmlinkage void vmx_vmexit_handler(struc
             /* Already handled above. */
             break;
         case TRAP_invalid_op:
+            HVMTRACE_1D(TRAP, vector);
             vmx_vmexit_ud_intercept(regs);
             break;
         default:
+            HVMTRACE_1D(TRAP, vector);
             goto exit_and_crash;
         }
         break;
diff -r 96bbdc894224 -r 68ac72db10a3 xen/include/asm-x86/hvm/trace.h
--- a/xen/include/asm-x86/hvm/trace.h   Fri Nov 25 15:48:03 2011 +0000
+++ b/xen/include/asm-x86/hvm/trace.h   Fri Nov 25 17:12:41 2011 +0000
@@ -50,6 +50,10 @@
 #define DO_TRC_HVM_CLTS        DEFAULT_HVM_MISC
 #define DO_TRC_HVM_LMSW        DEFAULT_HVM_MISC
 #define DO_TRC_HVM_LMSW64      DEFAULT_HVM_MISC
+#define DO_TRC_HVM_REALMODE_EMULATE DEFAULT_HVM_MISC 
+#define DO_TRC_HVM_TRAP             DEFAULT_HVM_MISC
+#define DO_TRC_HVM_TRAP_DEBUG       DEFAULT_HVM_MISC
+#define DO_TRC_HVM_VLAPIC           DEFAULT_HVM_MISC
 
 
 #ifdef __x86_64__
diff -r 96bbdc894224 -r 68ac72db10a3 xen/include/public/trace.h
--- a/xen/include/public/trace.h        Fri Nov 25 15:48:03 2011 +0000
+++ b/xen/include/public/trace.h        Fri Nov 25 17:12:41 2011 +0000
@@ -164,6 +164,10 @@
 #define TRC_HVM_RDTSC           (TRC_HVM_HANDLER + 0x1a)
 #define TRC_HVM_INTR_WINDOW     (TRC_HVM_HANDLER + 0x20)
 #define TRC_HVM_NPF             (TRC_HVM_HANDLER + 0x21)
+#define TRC_HVM_REALMODE_EMULATE (TRC_HVM_HANDLER + 0x22)
+#define TRC_HVM_TRAP             (TRC_HVM_HANDLER + 0x23)
+#define TRC_HVM_TRAP_DEBUG       (TRC_HVM_HANDLER + 0x24)
+#define TRC_HVM_VLAPIC           (TRC_HVM_HANDLER + 0x25)
 
 #define TRC_HVM_IOPORT_WRITE    (TRC_HVM_HANDLER + 0x216)
 #define TRC_HVM_IOMEM_WRITE     (TRC_HVM_HANDLER + 0x217)

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