KVM: s390: epoch difference and TOD programmable field

This patch makes vcpu epoch difference and the TOD programmable
field accessible from userspace. This is needed in order to
implement a couple of instructions that deal with the time of
day clock on s390, such as SET CLOCK and for migration.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 894b3e47b8c1..cc4c01322ce4 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -446,6 +446,14 @@ static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
         int r = -EINVAL;
 
         switch (reg->id) {
+        case KVM_REG_S390_TODPR:
+                r = put_user(vcpu->arch.sie_block->todpr,
+                             (u32 __user *)reg->addr);
+                break;
+        case KVM_REG_S390_EPOCHDIFF:
+                r = put_user(vcpu->arch.sie_block->epoch,
+                             (u64 __user *)reg->addr);
+                break;
         default:
                 break;
         }
@@ -459,6 +467,14 @@ static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
         int r = -EINVAL;
 
         switch (reg->id) {
+        case KVM_REG_S390_TODPR:
+                r = get_user(vcpu->arch.sie_block->todpr,
+                             (u32 __user *)reg->addr);
+                break;
+        case KVM_REG_S390_EPOCHDIFF:
+                r = get_user(vcpu->arch.sie_block->epoch,
+                             (u64 __user *)reg->addr);
+                break;
         default:
                 break;
         }