Added host interface for selective system call exiting utility

diff --git a/linux_module/Makefile b/linux_module/Makefile
index b2e73df..98416cb 100644 (file)
--- a/linux_module/Makefile
+++ b/linux_module/Makefile
@@ -40,6 +40,8 @@ v3vee-$(V3_CONFIG_VNET) +=    palacios-vnet.o \
 v3vee-$(V3_CONFIG_HOST_HYPERCALL) += iface-host-hypercall.o
 v3vee-$(V3_CONFIG_EXT_CODE_INJECT) += iface-code-inject.o
 v3vee-$(V3_CONFIG_EXT_ENV_INJECT) += iface-env-inject.o
+v3vee-$(V3_CONFIG_EXT_SELECTIVE_SYSCALL_EXIT) += iface-syscall.o
+
 
 v3vee-objs := $(v3vee-y) ../libv3vee.a
 obj-m := v3vee.o

diff --git a/linux_module/iface-syscall.c b/linux_module/iface-syscall.c
new file mode 100644 (file)
index 0000000..0ed6231
--- /dev/null
+++ b/linux_module/iface-syscall.c
@@ -0,0 +1,94 @@
+/*
+ * Linux interface for control of the fast system call
+ * exiting utility
+ *
+ * (c) Kyle C. Hale 2012
+ *
+ */
+
+#include <linux/uaccess.h>
+#include <linux/module.h>
+
+#include <gears/syscall_hijack.h>
+
+#include "palacios.h"
+#include "vm.h"
+#include "linux-exts.h"
+
+#include "iface-syscall.h"
+
+
+static int vm_syscall_ctrl (struct v3_guest * guest, unsigned int cmd, unsigned long arg, void * priv_data) {
+    struct v3_syscall_cmd syscall_cmd;
+    int ret;
+
+    if (copy_from_user(&syscall_cmd, (void __user *)arg, sizeof(struct v3_syscall_cmd))) {
+        printk("Palacios: error copying syscall command from userspace\n");
+        return -EFAULT;
+    }
+    
+    switch (syscall_cmd.cmd) {
+
+        case SYSCALL_OFF: {
+            ret = v3_syscall_off(guest->v3_ctx, syscall_cmd.syscall_nr);
+            if (ret < 0) {
+                printk("Palacios: error deactivating syscall exiting for syscall nr: %d\n", syscall_cmd.syscall_nr);
+            }
+            break;
+        }
+        case SYSCALL_ON: {
+            ret = v3_syscall_on(guest->v3_ctx, syscall_cmd.syscall_nr);
+            if (ret < 0) {
+                printk("Palacios: error activating syscall exiting for syscall nr: %d\n", syscall_cmd.syscall_nr);
+            }
+            break;
+        }
+        case SYSCALL_STAT: {
+            ret = v3_syscall_stat(guest->v3_ctx, syscall_cmd.syscall_nr);  
+            if (ret == SYSCALL_OFF)
+                printk("Palacios: exiting for syscall #%d is OFF\n", syscall_cmd.syscall_nr);
+            else if (ret == SYSCALL_ON) 
+                printk("Palacios: exiting for syscall #%d is ON\n", syscall_cmd.syscall_nr);
+            else 
+                printk("Palacios: error stating syscall nr: %d\n", syscall_cmd.syscall_nr);
+            break;
+        }
+        default:
+            printk("Palacios: error - invalid syscall command\n");
+            return -1;
+    }
+      
+    return ret;
+}
+
+
+static int init_syscall_ctrl (void) {
+    return 0;
+}
+
+
+static int deinit_syscall_ctrl (void) { 
+    return 0;
+}
+
+
+static int guest_init_syscall_ctrl (struct v3_guest * guest, void ** vm_data) {
+    add_guest_ctrl(guest, V3_VM_SYSCALL_CTRL, vm_syscall_ctrl, NULL);
+    return 0;
+}
+
+
+static int guest_deinit_syscall_ctrl (struct v3_guest * guest, void * vm_data) {
+    return 0;
+}
+
+
+static struct linux_ext syscall_ctrl_ext = {
+    .name = "SYSCALL_CTRL",
+    .init = init_syscall_ctrl,
+    .deinit = deinit_syscall_ctrl,
+    .guest_init = guest_init_syscall_ctrl,
+    .guest_deinit = guest_deinit_syscall_ctrl
+};
+
+register_extension(&syscall_ctrl_ext);

diff --git a/linux_module/iface-syscall.h b/linux_module/iface-syscall.h
new file mode 100644 (file)
index 0000000..8118235
--- /dev/null
+++ b/linux_module/iface-syscall.h
@@ -0,0 +1,16 @@
+#ifndef __IFACE_SYSCALL_H__
+#define __IFACE_SYSCALL_H__
+
+#define SYSCALL_OFF   0
+#define SYSCALL_ON    1
+#define SYSCALL_STAT  2
+
+#define V3_VM_SYSCALL_CTRL 0x5CA11
+
+struct v3_syscall_cmd {
+    int cmd;
+    int syscall_nr;
+};
+
+
+#endif

diff --git a/linux_module/ioctls.txt b/linux_module/ioctls.txt
index 322dd5a..661a2fe 100644 (file)
--- a/linux_module/ioctls.txt
+++ b/linux_module/ioctls.txt
@@ -30,3 +30,4 @@ VM Commands (/dev/v3-vm*)
 
 13125 -- (EXT) Inject Environment Variables into Guest Process
 
+5CA11 -- (EXT) Get/Set System call exiting status