From 9b0d721a07a2d92c79362dda8e6d896b2c107ce6 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Tue, 12 Jan 2016 17:40:54 +0100 Subject: [PATCH] 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 --- arch/s390/kvm/kvm-s390.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 12cec63ed..d0dcf73 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); -- 2.7.4