s390: use virtio_console for KVM on s390

This patch enables virtio_console as the default console on kvm for
s390. We currently use the same notify hack as lguest for early
console output. I will try to address this for lguest and s390 later.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2 files changed, 4 insertions, 1 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index eb530b4128ba..2ed88122be93 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -565,6 +565,7 @@ bool "s390 guest support (EXPERIMENTAL)"
         depends on 64BIT && EXPERIMENTAL
         select VIRTIO
         select VIRTIO_RING
+        select VIRTIO_CONSOLE
         help
           Select this option if you want to run the kernel under s390 linux
 endmenu
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index b358e18273b0..62122bad1e33 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -54,6 +54,7 @@
 #include <asm/sections.h>
 #include <asm/ebcdic.h>
 #include <asm/compat.h>
+#include <asm/kvm_virtio.h>
 
 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
@@ -766,7 +767,8 @@ setup_arch(char **cmdline_p)
                 printk("We are running under VM (64 bit mode)\n");
         else if (MACHINE_IS_KVM) {
                 printk("We are running under KVM (64 bit mode)\n");
-                add_preferred_console("ttyS", 1, NULL);
+                add_preferred_console("hvc", 0, NULL);
+                s390_virtio_console_init();
         } else
                 printk("We are running native (64 bit mode)\n");
 #endif /* CONFIG_64BIT */