KVM: s390: Fix clock comparator field for STORE STATUS

Only the most 7 significant bytes of the clock comparator must be
saved to the status area, and the byte at offset 304 has to be zero.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 55eb8dec2a77..1bb1ddaf93c0 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -877,6 +877,7 @@ int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr)
 {
         unsigned char archmode = 1;
         int prefix;
+        u64 clkcomp;
 
         if (addr == KVM_S390_STORE_STATUS_NOADDR) {
                 if (copy_to_guest_absolute(vcpu, 163ul, &archmode, 1))
@@ -920,8 +921,9 @@ int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr)
                         &vcpu->arch.sie_block->cputm, 8, prefix))
                 return -EFAULT;
 
+        clkcomp = vcpu->arch.sie_block->ckc >> 8;
         if (__guestcopy(vcpu, addr + offsetof(struct save_area, clk_cmp),
-                        &vcpu->arch.sie_block->ckc, 8, prefix))
+                        &clkcomp, 8, prefix))
                 return -EFAULT;
 
         if (__guestcopy(vcpu, addr + offsetof(struct save_area, acc_regs),