KVM: s390: add debug statement for diag 318 CPNC data
The diag 318 data contains values that denote information regarding the guest's environment. Currently, it is unecessarily difficult to observe this value (either manually-inserted debug statements, gdb stepping, mem dumping etc). It's useful to observe this information to obtain an at-a-glance view of the guest's environment, so lets add a simple VCPU event that prints the CPNC to the s390dbf logs. Signed-off-by: Collin Walling <walling@linux.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Link: https://lore.kernel.org/r/20211027025451.290124-1-walling@linux.ibm.com [borntraeger@de.ibm.com]: change debug level to 3 Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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@ -4255,6 +4255,7 @@ static void sync_regs_fmt2(struct kvm_vcpu *vcpu)
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if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) {
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vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318;
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vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc;
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VCPU_EVENT(vcpu, 3, "setting cpnc to %d", vcpu->arch.diag318_info.cpnc);
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}
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/*
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* If userspace sets the riccb (e.g. after migration) to a valid state,
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