From: Janis Schoetterl-Glausch scgl@linux.ibm.com
[ Upstream commit 85f517b29418158d3e6e90c3f0fc01b306d2f1a1 ]
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 a11bdb1a6b78 ("KVM: s390: Fix pfmf and conditional skey emulation").
Fixes: bd096f644319 ("KVM: s390: Add skey emulation fault handling") Signed-off-by: Janis Schoetterl-Glausch scgl@linux.ibm.com Reviewed-by: Christian Borntraeger borntraeger@de.ibm.com Reviewed-by: Claudio Imbrenda imbrenda@linux.ibm.com Link: https://lore.kernel.org/r/20211022152648.26536-1-scgl@linux.ibm.com Signed-off-by: Christian Borntraeger borntraeger@de.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/kvm/priv.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index 560310e29e275..fa69610fe6b12 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -398,6 +398,8 @@ static int handle_sske(struct kvm_vcpu *vcpu) up_read(¤t->mm->mmap_sem); if (rc == -EFAULT) return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + if (rc == -EAGAIN) + continue; if (rc < 0) return rc; start += PAGE_SIZE;