Merge branch 'bugfix' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen

* 'bugfix' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen:
  xen: mask extended topology info in cpuid
  xen/hvc: make sure console output is always emitted, with explicit polling

1 files changed, 24 insertions, 1 deletions

diff --git a/drivers/char/hvc_xen.c b/drivers/char/hvc_xen.c
index eba999f8598d..a6ee32b599a8 100644
--- a/drivers/char/hvc_xen.c
+++ b/drivers/char/hvc_xen.c
@@ -55,7 +55,7 @@ static inline void notify_daemon(void)
         notify_remote_via_evtchn(xen_start_info->console.domU.evtchn);
 }
 
-static int write_console(uint32_t vtermno, const char *data, int len)
+static int __write_console(const char *data, int len)
 {
         struct xencons_interface *intf = xencons_interface();
         XENCONS_RING_IDX cons, prod;
@@ -76,6 +76,29 @@ static int write_console(uint32_t vtermno, const char *data, int len)
         return sent;
 }
 
+static int write_console(uint32_t vtermno, const char *data, int len)
+{
+        int ret = len;
+
+        /*
+         * Make sure the whole buffer is emitted, polling if
+         * necessary.  We don't ever want to rely on the hvc daemon
+         * because the most interesting console output is when the
+         * kernel is crippled.
+         */
+        while (len) {
+                int sent = __write_console(data, len);
+                
+                data += sent;
+                len -= sent;
+
+                if (unlikely(len))
+                        HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
+        }
+
+        return ret;
+}
+
 static int read_console(uint32_t vtermno, char *buf, int len)
 {
         struct xencons_interface *intf = xencons_interface();