KVM: s390: Support for I/O interrupts.

Add support for handling I/O interrupts (standard, subchannel-related
ones and rudimentary adapter interrupts).

The subchannel-identifying parameters are encoded into the interrupt
type.

I/O interrupts are floating, so they can't be injected on a specific
vcpu.

Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index e6e5d4b13708..54540bdd3340 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -401,6 +401,15 @@ struct kvm_s390_psw {
 #define KVM_S390_INT_SERVICE            0xffff2401u
 #define KVM_S390_INT_EMERGENCY          0xffff1201u
 #define KVM_S390_INT_EXTERNAL_CALL      0xffff1202u
+/* Anything below 0xfffe0000u is taken by INT_IO */
+#define KVM_S390_INT_IO(ai,cssid,ssid,schid)   \
+        (((schid)) |                           \
+         ((ssid) << 16) |                      \
+         ((cssid) << 18) |                     \
+         ((ai) << 26))
+#define KVM_S390_INT_IO_MIN             0x00000000u
+#define KVM_S390_INT_IO_MAX             0xfffdffffu
+
 
 struct kvm_s390_interrupt {
         __u32 type;