xc_ptrace: Allow gdbserver to connect to a guest before APs are

brought online.

Signed-off-by: Kip Macy <kmacy@freebsd.org>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

diff --git a/tools/libxc/xc_ptrace.c b/tools/libxc/xc_ptrace.c
index 09d5c656d54ff07d51db94c62d3cbeddedcab67c..fa6c3a0ad1b203c0e13002203dc7346095cd3f89 100644 (file)
--- a/tools/libxc/xc_ptrace.c
+++ b/tools/libxc/xc_ptrace.c
@@ -112,17 +112,16 @@ static int
 get_online_cpumap(int xc_handle, struct xen_domctl_getdomaininfo *d,
                   uint64_t *cpumap)
 {
-    int i, online, retval;
+    int i, online;
 
     *cpumap = 0;
     for (i = 0; i <= d->max_vcpu_id; i++) {
-        if ((retval = fetch_regs(xc_handle, i, &online)))
-            return retval;
+        fetch_regs(xc_handle, i, &online);
         if (online)
             *cpumap |= (1 << i);
     }
-
-    return 0;
+    
+    return (*cpumap == 0) ? -1 : 0;
 }
 
 /*