[S390] s390/hvc_console: z/VM IUCV hypervisor console support

This patch introduces a new hypervisor console (HVC) back-end that provides
terminal access over the z/VM inter-user communication vehicle (IUCV).

The z/VM IUCV communication is independent of the regular tcp/ip network
and allows access even if there is no network connection between two
z/VM guest virtual machines.
The z/VM IUCV hypervisor console back-end helps the user to access a
z/VM guest virtual machine that lacks of network connectivity; and thus,
provides a "full-screen" terminal alternative to 3215/3270 terminal sessions.

Use the hvc_iucv=[0..8] kernel boot parameter to specify the number of
HVC terminals using a z/VM IUCV back-end.

A recent version of the s390-tools package is required to establish a
terminal connection to a z/VM IUCV hypervisor console back-end.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 43d6ba83a191..8783457b93d3 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -622,6 +622,16 @@ config HVC_BEAT
         help
           Toshiba's Cell Reference Set Beat Console device driver
 
+config HVC_IUCV
+        bool "z/VM IUCV Hypervisor console support (VM only)"
+        depends on S390
+        select HVC_DRIVER
+        select IUCV
+        default y
+        help
+          This driver provides a Hypervisor console (HVC) back-end to access
+          a Linux (console) terminal via a z/VM IUCV communication path.
+
 config HVC_XEN
         bool "Xen Hypervisor Console support"
         depends on XEN