From f1a86cfbd38266ff070f5b2cc76eb0b95bfb64e5 Mon Sep 17 00:00:00 2001
From: Tomoki Shirasawa <sira@popeye.cc.u-tokyo.ac.jp>
Date: Thu, 4 Dec 2014 11:17:29 +0900
Subject: [PATCH] when host mcexec down, syscall is hung up

---
 kernel/syscall.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/syscall.c b/kernel/syscall.c
index e05c259c..7006966a 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -185,11 +185,15 @@ long do_syscall(struct syscall_request *req, ihk_mc_user_context_t *ctx,
 	long rc;
 	int islock = 0;
 	unsigned long irqstate;
+	struct process *proc = cpu_local_var(current);
 
 	dkprintf("SC(%d)[%3d] sending syscall\n",
 	        ihk_mc_get_processor_id(),
 	        req->number);
 
+	if(proc->nohost) // host is down
+		return -EPIPE;
+
 	if(req->number == __NR_exit_group ||
 	   req->number == __NR_gettid ||
 	   req->number == __NR_kill){ // interrupt syscall