From: David Hildenbrand Date: Tue, 12 Jan 2016 16:40:54 +0000 (+0100) Subject: KVM: s390: instruction-fetching exceptions on SIE faults X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9b0d721a07a2d92c79362dda8e6d896b2c107ce6;p=linux-beck.git KVM: s390: instruction-fetching exceptions on SIE faults On instruction-fetch exceptions, we have to forward the PSW by any valid ilc and correctly use that ilc when injecting the irq. Injection will already take care of rewinding the PSW if we injected a nullifying program irq, so we don't need special handling prior to injection. Until now, autodetection would have guessed an ilc of 0. Reviewed-by: Christian Borntraeger Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger --- diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 12cec63eda27..d0dcf73f36bc 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -2181,9 +2181,17 @@ static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu) * to be able to forward the PSW. */ rc = read_guest_instr(vcpu, &opcode, 1); - if (rc) - return kvm_s390_inject_prog_cond(vcpu, rc); ilen = insn_length(opcode); + if (rc < 0) { + return rc; + } else if (rc) { + /* Instruction-Fetching Exceptions - we can't detect the ilen. + * Forward by arbitrary ilc, injection will take care of + * nullification if necessary. + */ + pgm_info = vcpu->arch.pgm; + ilen = 4; + } pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID; kvm_s390_forward_psw(vcpu, ilen); return kvm_s390_inject_prog_irq(vcpu, &pgm_info);