lguest: Reboot support

Reboot Implemented

(Prevent fd leak, fix style and fix documentation --RR)

Signed-off-by: Balaji Rao <balajirrao@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2 files changed, 6 insertions, 2 deletions

diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c
index f10abc8d7635..c1069bceba11 100644
--- a/drivers/lguest/core.c
+++ b/drivers/lguest/core.c
@@ -235,6 +235,8 @@ int run_guest(struct lguest *lg, unsigned long __user *user)
                 lguest_arch_handle_trap(lg);
         }
 
+        if (lg->dead == ERR_PTR(-ERESTART))
+                return -ERESTART;
         /* The Guest is dead => "No such file or directory" */
         return -ENOENT;
 }
diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c
index b478affe8f91..05fad6fa8049 100644
--- a/drivers/lguest/hypercalls.c
+++ b/drivers/lguest/hypercalls.c
@@ -41,8 +41,8 @@ static void do_hcall(struct lguest *lg, struct hcall_args *args)
                  * do that. */
                 kill_guest(lg, "already have lguest_data");
                 break;
-        case LHCALL_CRASH: {
-                /* Crash is such a trivial hypercall that we do it in four
+        case LHCALL_SHUTDOWN: {
+                /* Shutdown is such a trivial hypercall that we do it in four
                  * lines right here. */
                 char msg[128];
                 /* If the lgread fails, it will call kill_guest() itself; the
@@ -50,6 +50,8 @@ static void do_hcall(struct lguest *lg, struct hcall_args *args)
                 __lgread(lg, msg, args->arg1, sizeof(msg));
                 msg[sizeof(msg)-1] = '\0';
                 kill_guest(lg, "CRASH: %s", msg);
+                if (args->arg2 == LGUEST_SHUTDOWN_RESTART)
+                        lg->dead = ERR_PTR(-ERESTART);
                 break;
         }
         case LHCALL_FLUSH_TLB: