s390: use virtio_console for KVM on s390

[linux-2.6-omap-h63xx.git] / drivers / s390 / kvm / kvm_virtio.c

diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 5ab34340919be3a417caf1ad5bfd50ff91f1054d..d41f234bb2c28445361f3027cd39bb2542c93b81 100644 (file)
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -15,6 +15,7 @@
 #include <linux/err.h>
 #include <linux/virtio.h>
 #include <linux/virtio_config.h>
+#include <linux/virtio_console.h>
 #include <linux/interrupt.h>
 #include <linux/virtio_ring.h>
 #include <linux/pfn.h>
@@ -333,6 +334,25 @@ static int __init kvm_devices_init(void)
        return 0;
 }
 
+/* code for early console output with virtio_console */
+static __init int early_put_chars(u32 vtermno, const char *buf, int count)
+{
+       char scratch[17];
+       unsigned int len = count;
+
+       if (len > sizeof(scratch) - 1)
+               len = sizeof(scratch) - 1;
+       scratch[len] = '\0';
+       memcpy(scratch, buf, len);
+       kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, __pa(scratch));
+       return len;
+}
+
+void s390_virtio_console_init(void)
+{
+       virtio_cons_early_init(early_put_chars);
+}
+
 /*
  * We do this after core stuff, but before the drivers.
  */