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KVM: s390: interrupt: Fix single-stepping keyless mode exits 

kvm_s390_skey_check_enable() does not emulate any instructions, rather,
it clears CPUSTAT_KSS and arranges the instruction that caused the exit
(e.g., ISKE, SSKE, RRBE or LPSWE with a keyed PSW) to run again.

Therefore, skip the PER check and let the instruction execution happen.
Otherwise, a debugger will see two single-step events on the same
instruction.

Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-ID: <20230725143857.228626-6-iii@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
This commit is contained in:
Ilya Leoshkevich 2023-07-25 16:37:20 +02:00 committed by Janosch Frank
parent 1ad1fa820e
commit fdbeb55ebd
1 changed files with 2 additions and 2 deletions
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4
arch/s390/kvm/intercept.c
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@ -630,8 +630,8 @@ int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
rc = handle_partial_execution(vcpu);
break;
case ICPT_KSS:
rc = kvm_s390_skey_check_enable(vcpu);
break;
/* Instruction will be redriven, skip the PER check. */
return kvm_s390_skey_check_enable(vcpu);
case ICPT_MCHKREQ:
case ICPT_INT_ENABLE:
/*