diff options
Diffstat (limited to 'tools/testing/selftests/kvm/lib/s390x/ucall.c')
-rw-r--r-- | tools/testing/selftests/kvm/lib/s390x/ucall.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/lib/s390x/ucall.c b/tools/testing/selftests/kvm/lib/s390x/ucall.c new file mode 100644 index 0000000000..cca9873465 --- /dev/null +++ b/tools/testing/selftests/kvm/lib/s390x/ucall.c @@ -0,0 +1,22 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ucall support. A ucall is a "hypercall to userspace". + * + * Copyright (C) 2019 Red Hat, Inc. + */ +#include "kvm_util.h" + +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + + if (run->exit_reason == KVM_EXIT_S390_SIEIC && + run->s390_sieic.icptcode == 4 && + (run->s390_sieic.ipa >> 8) == 0x83 && /* 0x83 means DIAGNOSE */ + (run->s390_sieic.ipb >> 16) == 0x501) { + int reg = run->s390_sieic.ipa & 0xf; + + return (void *)run->s.regs.gprs[reg]; + } + return NULL; +} |