KVM: s390: expose gbea register to userspace

For migration/reset we want to expose the guest breaking event
address register to userspace. Lets use ONE_REG for that purpose.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>

2 files changed, 9 insertions, 0 deletions

diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
index 766324476f12..2f0ade24f96a 100644
--- a/arch/s390/include/uapi/asm/kvm.h
+++ b/arch/s390/include/uapi/asm/kvm.h
@@ -77,4 +77,5 @@ struct kvm_sync_regs {
 #define KVM_REG_S390_PFCOMPARE  (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x6)
 #define KVM_REG_S390_PFSELECT   (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x7)
 #define KVM_REG_S390_PP         (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x8)
+#define KVM_REG_S390_GBEA       (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x9)
 #endif
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 0262936e18be..a3e4c07ec3a5 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -576,6 +576,10 @@ static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
                 r = put_user(vcpu->arch.sie_block->pp,
                              (u64 __user *)reg->addr);
                 break;
+        case KVM_REG_S390_GBEA:
+                r = put_user(vcpu->arch.sie_block->gbea,
+                             (u64 __user *)reg->addr);
+                break;
         default:
                 break;
         }
@@ -621,6 +625,10 @@ static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
                 r = get_user(vcpu->arch.sie_block->pp,
                              (u64 __user *)reg->addr);
                 break;
+        case KVM_REG_S390_GBEA:
+                r = get_user(vcpu->arch.sie_block->gbea,
+                             (u64 __user *)reg->addr);
+                break;
         default:
                 break;
         }