KVM: async_pf: Async page fault support on s390

This patch enables async page faults for s390 kvm guests.
It provides the userspace API to enable and disable_wait this feature.
The disable_wait will enforce that the feature is off by waiting on it.
Also it includes the diagnose code, called by the guest to enable async page faults.

The async page faults will use an already existing guest interface for this
purpose, as described in "CP Programming Services (SC24-6084)".

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 19f717b15297..7d76401d2bb5 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -413,6 +413,8 @@ struct kvm_s390_psw {
 #define KVM_S390_PROGRAM_INT            0xfffe0001u
 #define KVM_S390_SIGP_SET_PREFIX        0xfffe0002u
 #define KVM_S390_RESTART                0xfffe0003u
+#define KVM_S390_INT_PFAULT_INIT        0xfffe0004u
+#define KVM_S390_INT_PFAULT_DONE        0xfffe0005u
 #define KVM_S390_MCHK                   0xfffe1000u
 #define KVM_S390_INT_VIRTIO             0xffff2603u
 #define KVM_S390_INT_SERVICE            0xffff2401u