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KVM: s390: Remove user triggerable WARN_ON

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pin_map_page() fails legitimately whenever the userspace mapping behind
the adapter route has gone away, e.g. when the VMM unmaps that memory.
As this can happen without a kernel programming error, remove the
WARN_ON.

Fixes: 1e95e3bc6b ("KVM: s390: Enable adapter_indicators_set to use mapped pages")
Cc: Douglas Freimuth <freimuth@linux.ibm.com>
Cc: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Douglas Freimuth <freimuth@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260805110455.7200-2-borntraeger@linux.ibm.com>
This commit is contained in:
Christian Borntraeger 2026-08-05 13:04:48 +02:00 committed by Claudio Imbrenda
parent feadc5e84d
commit b98014e98e
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kvm/interrupt.c
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@ -3013,7 +3013,7 @@ static int adapter_indicators_set(struct kvm *kvm,
if (!summary_info) {
spin_unlock_irqrestore(&adapter->maps_lock, flags);
summary_page = pin_map_page(kvm, adapter_int->summary_addr, 0);
if (WARN_ON_ONCE(!summary_page))
if (!summary_page)
return -1;
idx = srcu_read_lock(&kvm->srcu);
map = page_address(summary_page);