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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 <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2016-01-12 17:40:54 +01:00 committed by Christian Borntraeger
parent 5631792053
commit 9b0d721a07
1 changed files with 10 additions and 2 deletions
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12
arch/s390/kvm/kvm-s390.c
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@ -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);