KVM: s390: convert handle_prog()

Convert handle_prog() to new guest access functions.
Also make the code a bit more readable and look at the return code
of write_guest_lc() which was missing before.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index eeb1ac7..a8d8da8 100644 (file)
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -111,18 +111,22 @@ static int handle_instruction(struct kvm_vcpu *vcpu)
 
 static int handle_prog(struct kvm_vcpu *vcpu)
 {
+       struct kvm_s390_itdb *itdb;
+       int rc;
+
        vcpu->stat.exit_program_interruption++;
 
        /* Restore ITDB to Program-Interruption TDB in guest memory */
-       if (IS_TE_ENABLED(vcpu) &&
-           !(current->thread.per_flags & PER_FLAG_NO_TE) &&
-           IS_ITDB_VALID(vcpu)) {
-               copy_to_guest(vcpu, TDB_ADDR, vcpu->arch.sie_block->itdba,
-                             sizeof(struct kvm_s390_itdb));
-               memset((void *) vcpu->arch.sie_block->itdba, 0,
-                      sizeof(struct kvm_s390_itdb));
-       }
-
+       if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
+               goto skip_itdb;
+       if (current->thread.per_flags & PER_FLAG_NO_TE)
+               goto skip_itdb;
+       itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
+       rc = write_guest_lc(vcpu, TDB_ADDR, itdb, sizeof(*itdb));
+       if (rc)
+               return rc;
+       memset(itdb, 0, sizeof(*itdb));
+skip_itdb:
        trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
        return kvm_s390_inject_program_int(vcpu, vcpu->arch.sie_block->iprcc);
 }