Commit 85f517b2 authored by Janis Schoetterl-Glausch's avatar Janis Schoetterl-Glausch Committed by Christian Borntraeger

KVM: s390: Fix handle_sske page fault handling

If handle_sske cannot set the storage key, because there is no
page table entry or no present large page entry, it calls
fixup_user_fault.
However, currently, if the call succeeds, handle_sske returns
-EAGAIN, without having set the storage key.
Instead, retry by continue'ing the loop without incrementing the
address.
The same issue in handle_pfmf was fixed by
a11bdb1a ("KVM: s390: Fix pfmf and conditional skey emulation").

Fixes: bd096f64 ("KVM: s390: Add skey emulation fault handling")
Signed-off-by: default avatarJanis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: default avatarClaudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20211022152648.26536-1-scgl@linux.ibm.comSigned-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent 67cf68b6
......@@ -397,6 +397,8 @@ static int handle_sske(struct kvm_vcpu *vcpu)
mmap_read_unlock(current->mm);
if (rc == -EFAULT)
return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
if (rc == -EAGAIN)
continue;
if (rc < 0)
return rc;
start += PAGE_SIZE;
......
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