Xen devel - Sep 2010 - [PATCH] gdbsx: use MTF flag for HVM guests for single step

The attached patch first tries the MTF flag for HVM guest
single step, reverting to manually setting the TF flag  if MTF fails.

Tested on 4.0.1. Compile tested on unstable.

thanks,
Mukesh

Signed-off-by: mukesh.rathor@oracle.com

diff -r 1831912d4109 tools/debugger/gdbsx/xg/xg_main.c
--- a/tools/debugger/gdbsx/xg/xg_main.c	Thu Sep 02 19:12:42 2010 +0100
+++ b/tools/debugger/gdbsx/xg/xg_main.c	Fri Sep 03 17:03:05 2010 -0700
@@ -158,6 +158,7 @@
 
 
 /*
+ * Precondition: domctl global struct must be filled 
  * Returns : 0 Success, failure otherwise with errno set
  */
 static int
@@ -366,6 +367,19 @@
     union vcpu_guest_context_any anyc;
     int sz = sizeof(anyc);
 
+    /* first try the MTF for hvm guest. otherwise do manually */
+    if (_hvm_guest) {
+        domctl.u.debug_op.vcpu = which_vcpu;
+        domctl.u.debug_op.op = setit ? XEN_DOMCTL_DEBUG_OP_SINGLE_STEP_ON :
+                                       XEN_DOMCTL_DEBUG_OP_SINGLE_STEP_OFF;
+
+        if (_domctl_hcall(XEN_DOMCTL_debug_op, NULL, 0) == 0) {
+            XGTRC("vcpu:%d:MTF success setit:%d\n", which_vcpu,
setit);
+            return 0;
+        }
+        XGTRC("vcpu:%d:MTF failed. setit:%d\n", which_vcpu, setit);
+    }
+
     memset(&anyc, 0, sz);
     domctl.u.vcpucontext.vcpu = (uint16_t)which_vcpu;
     set_xen_guest_handle(domctl.u.vcpucontext.ctxt, &anyc.ctxt);




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