xen: make early console also write to debug console

When using "earlyprintk=xen", also write the console output to the raw
debug console.  This will appear on dom0's console if the hypervisor
has been compiled to allow it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 18 insertions, 11 deletions

diff --git a/drivers/char/hvc_xen.c b/drivers/char/hvc_xen.c
index e97d9d168325..2413af342a81 100644
--- a/drivers/char/hvc_xen.c
+++ b/drivers/char/hvc_xen.c
@@ -134,12 +134,27 @@ module_init(xen_init);
 module_exit(xen_fini);
 console_initcall(xen_cons_init);
 
+static void raw_console_write(const char *str, int len)
+{
+        while(len > 0) {
+                int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
+                if (rc <= 0)
+                        break;
+
+                str += rc;
+                len -= rc;
+        }
+}
+
+#ifdef CONFIG_EARLY_PRINTK
 static void xenboot_write_console(struct console *console, const char *string,
                                   unsigned len)
 {
         unsigned int linelen, off = 0;
         const char *pos;
 
+        raw_console_write(string, len);
+
         while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
                 linelen = pos-string+off;
                 if (off + linelen > len)
@@ -155,21 +170,13 @@ static void xenboot_write_console(struct console *console, const char *string,
 struct console xenboot_console = {
         .name           = "xenboot",
         .write          = xenboot_write_console,
-        .flags          = CON_PRINTBUFFER | CON_BOOT,
+        .flags          = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
 };
+#endif  /* CONFIG_EARLY_PRINTK */
 
 void xen_raw_console_write(const char *str)
 {
-        int len = strlen(str);
-
-        while(len > 0) {
-                int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
-                if (rc <= 0)
-                        break;
-
-                str += rc;
-                len -= rc;
-        }
+        raw_console_write(str, strlen(str));
 }
 
 void xen_raw_printk(const char *fmt, ...)