KVM: s390: fix stsi exception handling

In case of an exception the guest psw condition code should be left alone.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-By: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 23a8370..de1b1b6 100644 (file)
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -343,8 +343,8 @@ static int handle_stsi(struct kvm_vcpu *vcpu)
        int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
        int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
        int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
+       unsigned long mem = 0;
        u64 operand2;
-       unsigned long mem;
        int rc = 0;
 
        vcpu->stat.instruction_stsi++;
@@ -364,36 +364,36 @@ static int handle_stsi(struct kvm_vcpu *vcpu)
        case 2:
                mem = get_zeroed_page(GFP_KERNEL);
                if (!mem)
-                       goto out_fail;
+                       goto out_no_data;
                if (stsi((void *) mem, fc, sel1, sel2))
-                       goto out_mem;
+                       goto out_no_data;
                break;
        case 3:
                if (sel1 != 2 || sel2 != 2)
-                       goto out_fail;
+                       goto out_no_data;
                mem = get_zeroed_page(GFP_KERNEL);
                if (!mem)
-                       goto out_fail;
+                       goto out_no_data;
                handle_stsi_3_2_2(vcpu, (void *) mem);
                break;
        default:
-               goto out_fail;
+               goto out_no_data;
        }
 
        if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
                rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
-               goto out_mem;
+               goto out_exception;
        }
        trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
        free_page(mem);
        vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
        vcpu->run->s.regs.gprs[0] = 0;
        return 0;
-out_mem:
-       free_page(mem);
-out_fail:
+out_no_data:
        /* condition code 3 */
        vcpu->arch.sie_block->gpsw.mask |= 3ul << 44;
+out_exception:
+       free_page(mem);
        return rc;
 }