From: Kyle Hale <kh@u.northwestern.edu>
Date: Wed, 22 Jun 2011 00:08:05 +0000 (-0500)
Subject: Changes for software interrupt extension code
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=commitdiff_plain;h=e5649c2775438bbb04baf9a8bd53fa70363c4235

Changes for software interrupt extension code

Added code to register the extension. Also added an interface header file.
Added a case statement for exits on software interrupts in svm_handler.c. Also included
a compilation option for enabling swintr-specific debugging.
---

diff --git a/palacios/include/interfaces/sw_intr.h b/palacios/include/interfaces/sw_intr.h
new file mode 100644
index 0000000..eb63cc9
--- /dev/null
+++ b/palacios/include/interfaces/sw_intr.h
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National 
+ * Science Foundation and the Department of Energy.  
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico.  You can find out more at 
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2011, Kyle C. Hale <kh@u.northwestern.edu> 
+ * Copyright (c) 2011, The V3VEE Project <http://www.v3vee.org> 
+ * All rights reserved.
+ *
+ * Author: Kyle C. Hale <kh@u.northwestern.edu>
+ *
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+
+#ifndef __SW_INTR_H__
+#define __SW_INTR_H__
+
+#include <palacios/vmm.h>
+
+
+int v3_handle_swintr (struct guest_info * core);
+int v3_signal_swintr (struct guest_info * core, int vec);
+
+
+#endif
diff --git a/palacios/src/extensions/Kconfig b/palacios/src/extensions/Kconfig
index cc5f7ef..7a04e6b 100644
--- a/palacios/src/extensions/Kconfig
+++ b/palacios/src/extensions/Kconfig
@@ -52,6 +52,14 @@ config EXT_SW_INTERRUPTS
       of software interrupts (i.e. the INTn instruction) and enable
       any INT vector to be hooked
 
+config DEBUG_EXT_SW_INTERRUPTS
+    bool "Enable debugging of software interrupt interception code"
+    depends on EXT_SW_INTERRUPTS
+    default n
+    help
+      This will enable useful debugging printouts for software
+      intercept code
+
 config EXT_SWINTR_PASSTHROUGH
     bool "Hook all unhandled sofware interrupts for passthrough"
     depends on EXT_SW_INTERRUPTS
diff --git a/palacios/src/extensions/ext_sw_intr.c b/palacios/src/extensions/ext_sw_intr.c
index d34f382..26e8bb4 100644
--- a/palacios/src/extensions/ext_sw_intr.c
+++ b/palacios/src/extensions/ext_sw_intr.c
@@ -18,10 +18,11 @@
  */
 
 #include <palacios/vmm.h>
+#include <palacios/vmcb.h>
 #include <palacios/vm_guest.h>
 #include <palacios/vmm_extensions.h>
 
-
+#include <interfaces/sw_intr.h>
 
 static int init_swintr_intercept (struct v3_vm_info * vm, v3_cfg_tree_t * cfg, void ** priv_data);
 
@@ -36,6 +37,10 @@ static int deinit_swintr_intercept (struct v3_vm_info * vm, void * priv_data) {
 
 
 static int init_swintr_intercept_core (struct guest_info * core, void * priv_data) {
+    vmcb_t * vmcb = (vmcb_t*)core->vmm_data;
+    vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
+
+    ctrl_rea->instrs.INTn = 1;
 
     return 0;
 }
diff --git a/palacios/src/palacios/svm_handler.c b/palacios/src/palacios/svm_handler.c
index a84d2e1..1854c53 100644
--- a/palacios/src/palacios/svm_handler.c
+++ b/palacios/src/palacios/svm_handler.c
@@ -43,7 +43,9 @@
 #include <palacios/vmm_telemetry.h>
 #endif
 
-
+#ifdef V3_CONFIG_EXT_SW_INTERRUPTS
+#include <interfaces/sw_intr.h>
+#endif
 
 int v3_handle_svm_exit(struct guest_info * info, addr_t exit_code, addr_t exit_info1, addr_t exit_info2) {
 
@@ -275,6 +277,17 @@ int v3_handle_svm_exit(struct guest_info * info, addr_t exit_code, addr_t exit_i
 	    // Force exit on other cores
 
 	    break;
+#ifdef V3_CONFIG_EXT_SW_INTERRUPTS
+    case VMEXIT_SWINT:
+#ifdef V3_CONFIG_DEBUG_EXT_SW_INTERRUPTS
+        PrintDebug("Intercepted a software interrupt\n");
+#endif
+        if (v3_handle_swintr(info) == -1) {
+            PrintError("Error handling software interrupt\n");
+            return -1;
+        }
+        break;
+#endif
 
 
 	    /* Exits Following this line are NOT HANDLED */