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authorCornelia Huck <cornelia.huck@de.ibm.com>2016-07-07 17:07:57 +0200
committerMichael S. Tsirkin <mst@redhat.com>2016-08-09 13:42:41 +0300
commit3b2fbb3f06efe5bd2dfdce2a1db703e23c1a78af (patch)
tree5579f52e1c414bc6c2875126e46144399e06a1e0 /arch
parent2ab0d56aadbcd120b8fa524b4a1142e8b06e13c8 (diff)
virtio/s390: deprecate old transport
There only ever have been two host implementations of the old s390-virtio (pre-ccw) transport: the experimental kuli userspace, and qemu. As qemu switched its default to ccw with 2.4 (with most users having used ccw well before that) and removed the old transport entirely in 2.6, s390-virtio probably hasn't been in active use for quite some time and is therefore likely to bitrot. Let's start the slow march towards removing the code by deprecating it. Note that this also deprecates the early virtio console code, which has been causing trouble in the guest without being wired up in any relevant hypervisor code. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> Reviewed-by: Sascha Silbe <silbe@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/Kconfig13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 9e607bf2d640..5a2907ee8c93 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -871,4 +871,17 @@ config S390_GUEST
Select this option if you want to run the kernel as a guest under
the KVM hypervisor.
+config S390_GUEST_OLD_TRANSPORT
+ def_bool y
+ prompt "Guest support for old s390 virtio transport (DEPRECATED)"
+ depends on S390_GUEST
+ help
+ Enable this option to add support for the old s390-virtio
+ transport (i.e. virtio devices NOT based on virtio-ccw). This
+ type of virtio devices is only available on the experimental
+ kuli userspace or with old (< 2.6) qemu. If you are running
+ with a modern version of qemu (which supports virtio-ccw since
+ 1.4 and uses it by default since version 2.4), you probably won't
+ need this.
+
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