diff -rup libvirt-0.6.3.orig/src/qemu_conf.c libvirt-0.6.3.new/src/qemu_conf.c
--- libvirt-0.6.3.orig/src/qemu_conf.c	2009-08-13 13:56:44.000000000 +0100
+++ libvirt-0.6.3.new/src/qemu_conf.c	2009-08-13 13:59:26.000000000 +0100
@@ -476,6 +476,8 @@ int qemudExtractVersionInfo(const char *
     }
     if (strstr(help, "boot=on"))
         flags |= QEMUD_CMD_FLAG_DRIVE_BOOT;
+    if (strstr(help, "-no-kvm-pit-reinjection"))
+        flags |= QEMUD_CMD_FLAG_NO_PIT_REINJECT;
     if (version >= 9000)
         flags |= QEMUD_CMD_FLAG_VNC_COLON;
     if (kvm_version >= 74)
@@ -996,6 +998,9 @@ int qemudBuildCommandLine(virConnectPtr 
         ADD_ARG_LIT("-domid");
         ADD_ARG_LIT(domid);
     }
+    if (qemuCmdFlags & QEMUD_CMD_FLAG_NO_PIT_REINJECT) {
+        ADD_ARG_LIT("-no-kvm-pit-reinjection");
+    }
 
     /*
      * NB, -nographic *MUST* come before any serial, or monitor
diff -rup libvirt-0.6.3.orig/src/qemu_conf.h libvirt-0.6.3.new/src/qemu_conf.h
--- libvirt-0.6.3.orig/src/qemu_conf.h	2009-04-20 10:08:15.000000000 +0100
+++ libvirt-0.6.3.new/src/qemu_conf.h	2009-08-13 13:58:29.000000000 +0100
@@ -56,6 +56,7 @@ enum qemud_cmd_flags {
     QEMUD_CMD_FLAG_MIGRATE_QEMU_EXEC = (1 << 11), /* New migration syntax after merge to QEMU with EXEC transport */
     QEMUD_CMD_FLAG_DRIVE_CACHE_V2    = (1 << 12), /* Is the cache= flag wanting new v2 values */
     QEMUD_CMD_FLAG_KVM               = (1 << 13), /* Whether KVM is compiled in */
+    QEMUD_CMD_FLAG_NO_PIT_REINJECT   = (1 << 14), /* disable KVM kernel mode PIT interrupt reinjection */
 };
 
 /* Main driver state */