Enable xm console for vmx guest.

When the serial port is redirect to pty, write the allocated
device to xenstore, then xm console can get it.
TODO:serial port by pty shall not block if there are no reading
on the other end

Signed-off-by: Xiaofeng Ling <xiaofeng.ling@intel.com>

tools/examples/xmexample.vmx

@@ -117,6 +117,11 @@ vncviewer=1
 #nographic=0
 
 
+#-----------------------------------------------------------------------------
+#   serial port re-direct to pty deivce, /dev/pts/n 
+#   then xm console or minicom can connect
+#serial='pty'
+
 #----------------------------------------------------------------------------
 # enable ne2000, default = 0(use pcnet)
 ne2000=0

tools/ioemu/target-i386-dm/Makefile

@@ -7,7 +7,7 @@ INSTALL_DIR := $(DESTDIR)/usr/$(LIBDIR)/xen/bin
 TARGET_PATH=$(SRC_PATH)/target-$(TARGET_ARCH)
 VPATH=$(SRC_PATH):$(TARGET_PATH):$(SRC_PATH)/hw:$(SRC_PATH)/audio
 DEFINES=-I. -I$(TARGET_PATH) -I$(SRC_PATH)
-DEFINES+= -I$(XEN_ROOT)/tools/libxc
+DEFINES+= -I$(XEN_ROOT)/tools/libxc -I$(XEN_ROOT)/tools/xenstore
 ifdef CONFIG_USER_ONLY
 VPATH+=:$(SRC_PATH)/linux-user
 DEFINES+=-I$(SRC_PATH)/linux-user -I$(SRC_PATH)/linux-user/$(TARGET_ARCH)
@@ -188,7 +188,7 @@ endif
 #########################################################
 
 DEFINES+=-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
-LIBS+=-lm -L../../libxc -lxenctrl -lxenguest
+LIBS+=-lm -L../../libxc -lxenctrl -lxenguest -L../../xenstore -lxenstore
 ifndef CONFIG_USER_ONLY
 LIBS+=-lz
 endif

tools/ioemu/vl.c

@@ -76,6 +76,7 @@
 #endif /* CONFIG_SDL */
 
 #include "xenctrl.h"
+#include "xs.h"
 #include "exec-all.h"
 
 //#define DO_TB_FLUSH
@@ -1171,6 +1172,48 @@ CharDriverState *qemu_chr_open_stdio(void)
     return chr;
 }
 
+int store_console_dev(int domid, char *pts)
+{
+    int xc_handle;
+    unsigned int len = 0;
+    struct xs_handle *xs;
+    char *path;
+
+    xs = xs_daemon_open();
+    if (xs == NULL) {
+        fprintf(logfile, "Could not contact XenStore\n");
+        return -1;
+    }
+
+    xc_handle = xc_interface_open();
+    if (xc_handle == -1) {
+        fprintf(logfile, "xc_interface_open() error\n");
+        return -1;
+    }
+    
+    path = xs_get_domain_path(xs, domid);
+    if (path == NULL) {
+        fprintf(logfile, "xs_get_domain_path() error\n");
+        return -1;
+    }
+    path = realloc(path, strlen(path) + strlen("/console/tty") + 1);
+    if (path == NULL) {
+        fprintf(logfile, "realloc error\n");
+        return -1;
+    }
+    strcat(path, "/console/tty");
+    if (!xs_write(xs, NULL, path, pts, strlen(pts))) {
+        fprintf(logfile, "xs_write for console fail");
+        return -1;
+    }
+    
+    free(path);
+    xs_daemon_close(xs);
+    close(xc_handle);
+
+    return 0;
+}
+
 #if defined(__linux__)
 CharDriverState *qemu_chr_open_pty(void)
 {
@@ -1182,6 +1225,7 @@ CharDriverState *qemu_chr_open_pty(void)
         return NULL;
     }
     fprintf(stderr, "char device redirected to %s\n", slave_name);
+    store_console_dev(domid, slave_name);
     return qemu_chr_open_fd(master_fd, master_fd);
 }
 #else
@@ -2701,7 +2745,9 @@ int main(int argc, char **argv)
                 break;
             case QEMU_OPTION_nographic:
                 pstrcpy(monitor_device, sizeof(monitor_device), "stdio");
-                pstrcpy(serial_devices[0], sizeof(serial_devices[0]), "stdio");
+                if(!strcmp(serial_devices[0], "vc"))
+                    pstrcpy(serial_devices[0], sizeof(serial_devices[0]),
+                            "stdio");
                 nographic = 1;
                 break;
 #ifdef CONFIG_VNC