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KVM: s390: Fix handle_{sske,pfmf} under memory pressure

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Under heavy memory pressure, handle_sske() and handle_pfmf() might
cause an endless loop if the mmu cache runs empty, the atomic
allocations fail, and the top-up function also fails. While quite
unlikely, that scenario is not impossible.

Fix the issue by not ignoring the return value of
kvm_s390_mmu_cache_topup(), and appropriately returning an error code
in case of failure.

Fixes: e38c884df9 ("KVM: s390: Switch to new gmap")
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260623153331.233784-6-imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda
2026-06-23 17:33:26 +02:00
parent 6e976afdfe
commit 2bd74dce08
1 changed files with 6 additions and 2 deletions
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8
arch/s390/kvm/priv.c
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@@ -366,7 +366,9 @@ static int handle_sske(struct kvm_vcpu *vcpu)
if (rc > 1)
return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
if (rc == -ENOMEM) {
kvm_s390_mmu_cache_topup(vcpu->arch.mc);
rc = kvm_s390_mmu_cache_topup(vcpu->arch.mc);
if (rc)
return rc;
continue;
}
if (rc < 0)
@@ -1122,7 +1124,9 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
if (rc > 1)
return kvm_s390_inject_program_int(vcpu, rc);
if (rc == -ENOMEM) {
kvm_s390_mmu_cache_topup(vcpu->arch.mc);
rc = kvm_s390_mmu_cache_topup(vcpu->arch.mc);
if (rc)
return rc;
continue;
}
if (rc < 0)