KVM: s390: Factor out handle_itdb to handle TX aborts

Factor out the new function handle_itdb(), which copies the ITDB into
guest lowcore to fully handle a TX abort.

Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@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 f391604..30e1c5e 100644 (file)
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -171,12 +171,33 @@ static void __extract_prog_irq(struct kvm_vcpu *vcpu,
        }
 }
 
+/*
+ * restore ITDB to program-interruption TDB in guest lowcore
+ * and set TX abort indication if required
+*/
+static int handle_itdb(struct kvm_vcpu *vcpu)
+{
+       struct kvm_s390_itdb *itdb;
+       int rc;
+
+       if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
+               return 0;
+       if (current->thread.per_flags & PER_FLAG_NO_TE)
+               return 0;
+       itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
+       rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
+       if (rc)
+               return rc;
+       memset(itdb, 0, sizeof(*itdb));
+
+       return 0;
+}
+
 #define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
 
 static int handle_prog(struct kvm_vcpu *vcpu)
 {
        struct kvm_s390_pgm_info pgm_info;
-       struct kvm_s390_itdb *itdb;
        int rc;
 
        vcpu->stat.exit_program_interruption++;
@@ -188,20 +209,13 @@ static int handle_prog(struct kvm_vcpu *vcpu)
                        return 0;
        }
 
-       /* Restore ITDB to Program-Interruption TDB in guest memory */
-       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, __LC_PGM_TDB, itdb, sizeof(*itdb));
+       trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
+
+       rc = handle_itdb(vcpu);
        if (rc)
                return rc;
-       memset(itdb, 0, sizeof(*itdb));
-skip_itdb:
-       trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
-       __extract_prog_irq(vcpu, &pgm_info);
 
+       __extract_prog_irq(vcpu, &pgm_info);
        return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
 }